Android Developer

Using the Contacts Provider ApplicationDevelopment

Wed, 22 Feb 2012 14:58:35 GMT

Access to the contact manager is particularly useful on a communications device. Android does the right thing by exposing all the information available from the contacts database to any application granted the READ_CONTACTS permission. Android 2.0 API level 5 introduced the ContactsContract class, which superceded the Contacts class that had previously been used to store and manage the contacts stored on the device. The new contact Content Provider extends the scope of contacts management in...

About Native Sound AndroidGames

Wed, 22 Feb 2012 13:15:25 GMT

Native games like Doom and Wolf 3D, shown in later chapters, pack sound resources in their own formats and manipulate the sound device at the operating system level. Even though Android runs a Linux kernel behind the scenes, it is not a standard Linux distribution, especially with dealing with low-level devices, for example The standard Linux sound device dev dsp and mixer dev mixer are not supported, making reusing sound logic very difficult for native games. For some reason, Google decided to...

Saving a BitmapBased Canvas Drawing AndroidMedia

Wed, 22 Feb 2012 11:52:36 GMT

What good would it be to just draw on an image without being able to save it after the user has created a masterpiece So far we have just drawn images let's look at how we can commit these wonderful drawings to permanence. Well, at least let's look at how we can save them to the SD card. Unsurprisingly, it will be a similar process to what we used in the second chapter to save images captured from our custom camera application. Let's go over the changes that we can make to our ChoosePictureDraw...

HAL Stub fffl DataStructures

Wed, 22 Feb 2012 10:46:17 GMT

Service JNI framework base services jni AndroidJMH Mf ffij Copyright c 2009 Jollen's Consulting ISf H JIR www.jollen.org consulting AndroidJMH M Mf ii Copyright c 2009 Jollen's Consulting ISf H MJIR www.jollen.org consulting AndroidJMH M Mf ii Copyright c 2009 Jollen's Consulting ISf H MJIR www.jollen.org consulting

Summary of Important View Groups Android 1 6 SDK

Wed, 22 Feb 2012 00:18:02 GMT

These objects all hold child UI elements. Some provide their own form of a visible UI, while others are invisible structures that only manage the layout of their child views. Layout that acts as a view frame to display a single object. A horizontal scrolling display of images, from a bound list. Displays a scrolling grid of m columns and n rows. A layout that organizes its children into a single horizontal or vertical row. It creates a scrollbar if the length of the window exceeds the length of...

Bring Up Android on PXA270 AndroidPorting

Tue, 21 Feb 2012 23:24:41 GMT

Insert External USB Storage on PXA270 F lie Ed t Setup Control Window Help nit started BusyBox vl.13.2 2010-04-27 17 23 22 CST starting pid 848, tty Vetc init.d rcS' starting pid m, tty Vbin sh' BusyBox vl.13.2 2010-04-27 17 23 22 CST built-in shell ash Enter 'help' for a list of built-in commands. rootSAndroid Susb 1-1 new fuit speed USB device using pxa27x-ohci and addres usb 1-1 configuration 1 chosen frem 1 choice sesiil SCSI emulation for USB Mass Storage devices ses lt 0 0 0 0...

Info Wbu AndroidSDK

Tue, 21 Feb 2012 09:32:27 GMT

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Maps Geocoding and LocationBased Services ApplicationDevelopment

Tue, 21 Feb 2012 08:49:54 GMT

gt Forward and reverse geocoding gt Creating interactive maps with Map Views and Map Activities gt Creating and adding Overlays to maps gt Finding your location with location-based services One of the defining features of mobile phones is their portability, so it's not surprising that some of the most enticing Android features are the services that let you find, contextualize, and map physical locations. You can create map-based Activities using Google Maps as a user interface element. You...

Recipe Utilizing the SEARCH Key Android SDK 2

Tue, 21 Feb 2012 08:39:49 GMT

If an activity in the in-focus application is defined to be searchable, the SEARCH key invokes it. A menu choice or equivalent should always be a redundant way to call the searchable activity to accommodate devices without a SEARCH key. The menu choice simply needs a call to onSearchRequested . The searchable activity ideally should be declared as singleTop launch mode, as discussed in Chapter 2,Application Basics Activities and Intents.This enables multiple searches to take place without...

Explicitly Starting New Activities ApplicationDevelopment

Tue, 21 Feb 2012 06:46:41 GMT

You learned in Chapter 2 that applications consist of a number of interrelated screens Activities that must be included in the application manifest. To connect them you may want to explicitly specify an Activity to open. To explicitly select an Activity class to start, create a new Intent, specifying the current application Context and Activity class to launch. Pass this Intent in to startActivity as shown in Listing 5-1. LISTING 5-1 Explicitly starting an Activity Available for download on...

Issuing Shell Commands Android 1 6 SDK

Mon, 20 Feb 2012 21:08:47 GMT

Adb provides an ash shell that you can use to run a variety of commands on an emulator or device. The command binaries are stored in the file system of the emulator or device, in this location You can use the shell command to issue commands, with or without entering the adb remote shell on the emulator device. To issue a single command without entering a remote shell, use the shell command like this adb -d -e -s lt serialNumber gt shell lt shellCommand gt To drop into a remote shell on a...

Reading Network Details ApplicationDevelopment

Mon, 20 Feb 2012 19:31:05 GMT

When you are connected to a network, you can use the Telephony Manager to read the mobile country and network code MCC MNC , the country ISO code, and the type of network you're connected to. These commands will only work when you are connected to a mobile network, and can be unreliable if it is a CDMA network. Use the getPhoneType method as described above to determine which network type you are connected to. Listing 12-5 shows how to extract the network details, as well as showing a list of...

Supplying Anonymous Actions to Applications ApplicationDevelopment

Mon, 20 Feb 2012 17:39:48 GMT

To use this mechanism to make your Activity's actions available anonymously for existing applications, publish them using intent-filter tags within their manifest nodes. The Intent Filter describes the action it performs and the data upon which it can be performed. The latter will be used during the Intent resolution process to determine when this action should be available. The category tag must be either ALTERNATIVE or SELECTED_ALTERNATIVE or both. The text used for the Menu Items is...

Text on a Path AndroidMedia

Mon, 20 Feb 2012 13:46:45 GMT

Text isn't limited to being drawn on a horizontal line it can be drawn on a Path as well. Here is an example. Paint paint new Paint paint.setColor Color.GREEN paint.setTextSize 20 Path p new Path p.moveTo 20, 20 p.lineTo 100, 150 p.lineTo 200, 220 canvas.drawTextOnPath Hello this is text on a path, p, 0, 0, paint

Native Android Broadcast Actions ApplicationDevelopment

Mon, 20 Feb 2012 10:00:04 GMT

Android broadcasts Intents for many of the system Services. You can use these messages to add functionality to your own projects based on system events such as time-zone changes, data-connection status, incoming SMS messages, or phone calls. The following list introduces some of the native actions exposed as constants in the Intent class these actions are used primarily to track device status changes. gt action_boot_completed Fired once when the device has completed its startup sequence. An...

Audio Capture with an Intent AndroidMedia

Mon, 20 Feb 2012 08:02:14 GMT

The easiest way to simply allow audio recording capabilities in an application is to leverage an existing application through an intent that provides recording capabilities. In the case of audio, Android ships with a sound recorder application that can be triggered in this manner. The action used to create the intent is available as a constant called RECORD_SOUND_ACTION within the MediaStore.Audio.Media class. Here is the basic code to trigger the built-in sound recorder. Intent intent new...

Ongoing and Insistent Notifications ApplicationDevelopment

Mon, 20 Feb 2012 07:53:32 GMT

You can configure Notifications as ongoing and or insistent by setting the flag_insistent and FLAG_ONGOING_EVENT flags. Notifications flagged as ongoing, as in the following snippet, are used to represent events that are currently in progress such as a download in progress or music playing in the background . An ongoing Notification is a requirement for a foreground Service, as described earlier in this chapter. notification.flags notification.flags Notification.FLAG_ONGOING_EVENT Ongoing...

Android Database Design Considerations ApplicationDevelopment

Mon, 20 Feb 2012 05:10:33 GMT

There are several considerations specific to Android that you should keep in mind when designing your database. gt Files such as bitmaps or audio files are not usually stored within database tables. Use a string to store a path to the file, preferably a fully qualified URI. gt While not strictly a requirement, it's strongly recommended that all tables include an auto-increment key field as a unique index field for each row. If you plan to share your table using a Content Provider, a unique ID...

Preview Surface AndroidMedia

Mon, 20 Feb 2012 03:42:08 GMT

Also before we can get started using the camera, we need to create some type of Surface for the Camera to draw viewfinder or preview images on. A Surface is an abstract class in Android representing a place to draw graphics or images. One straightforward way to provide a drawing Surface is to use the SurfaceView class. SurfaceView is a concrete class providing a Surface within a standard View. To specify a SurfaceView in our layout, we simply use the lt SurfaceView gt element within any normal...

MediaRecorder Output Formats AndroidMedia

Sun, 19 Feb 2012 21:33:31 GMT

The next method to be called in sequence is setOutputFormat. The values this takes in are specified as constants in the MediaRecorder.OutputFormat inner class. This specifies that the file written will be an MPEG-4 file. It may contain both audio and video tracks. This represents a raw file without any type of container. This should be used only when capturing audio without video and when the audio encoder is AMR_NB. This specifies that the file written will be a 3GPP file extension .3gp . It...

MediaStore for Audio AndroidMedia

Sun, 19 Feb 2012 15:21:08 GMT

We explored using the MediaStore for images early on in this book. Much of what we learned can be leveraged for the storage and retrieval of other types of media, including audio. In order to provide a robust mechanism for browsing and searching for audio, Android includes a MediaStore.Audio package, which defines the standard content provider. Accessing audio files that are stored using the MediaStore provider is consistent with our previous uses of the MediaStore. In this case, we'll be using...

For each node dmtracedump shows callname where Android 1 6 SDK

Sun, 19 Feb 2012 14:48:31 GMT

lt ref gt -- Call reference number, as used in trace logs lt inc-ms gt -- Inclusive elapsed time milliseconds spent in method, including all child methods lt exc-ms gt -- Exclusive elapsed time milliseconds spent in method, not including any child methods lt numcalls gt -- Number of calls The usage for dmtracedump is The tool then loads trace log data from lt trace-base-name gt .data and lt trace-base-name gt .key. The table below lists the options for dmtracedump. Dump the trace file instead...

VAndroid LinuxKernel

Sun, 19 Feb 2012 08:58:12 GMT

Linux kernel 2.6.25 with Android enabled Tiny root file system for Flash ROM Android demo file system for USB Flash

Embedded Web Reports View Android Development 2

Sun, 19 Feb 2012 08:19:00 GMT

mWebView WebView findViewByld R.id.webview WebSettings webSettings mWebView.getSettings mWebView.setWebChromeClient new MyWebChromeClient mWebView.loadUrl url android id id webview android layout_weight 1 gt Intent iReportForm new Intent this, InternalWebView.class String reportDisplayUrl reportDisplayUrl

Android Emulator Android 1 6 SDK

Sat, 18 Feb 2012 23:19:54 GMT

The Android SDK includes a mobile device emulator -- a virtual mobile device that runs on your computer. The emulator lets you prototype, develop, and test Android applications without using a physical device. The Android emulator mimics all of the typical hardware and software features of a typical mobile device, except that it can not receive or place actual phone calls. It provides a variety of navigation and control keys, which you can press using your mouse or keyboard to generate events...

MediaRecorder Audio Sources AndroidMedia

Sat, 18 Feb 2012 17:18:38 GMT

The first method that should be called after the MediaRecorder is instantiated is setAudioSource. setAudioSource takes in a constant that is defined in the AudioSource inner class. Generally we will want to use MediaRecorder.AudioSource.MIC, but it is interesting to note that MediaRecorder.AudioSource also contains constants for VOICE_CALL, VOICE_DOWNLINK, and VOICE_UPLINK. Unfortunately, it appears as though there aren't any handsets or versions of Android where recording audio from the call...

Update Your Eclipse ADT Plugin Android 1 6 SDK

Sat, 18 Feb 2012 09:29:36 GMT

If you don't use the Eclipse IDE for development, skip to Run Your Applications. A new version of the ADT Plugin, ADT 0.9.3, is available in conjunction with this SDK release. To use the SDK, you must upgrade your ADT Plugin to version 0.9.3. With ADT 0.9.3, you can still compile your existing applications against multiple platform versions, such as Android 1.5, Android 1.1, and so on. However, ADT 0.9.3 is not compatible with previous versions of the SDK and its tools, so make sure that you...

Testing Doom for Android in the Emulator AndroidGames

Sat, 18 Feb 2012 00:43:24 GMT

To test the game in the emulator, create a launch configuration within your Eclipse IDE, as follows 1. From the main menu, select Run gt Run Configurations. 2. Enter a name for the configuration Doom and select the project ch07.Android.Doom. 3. Set the Launch Action as Launch Default Activity. Figure 7-4 shows the completed Run Configurations dialog box for this example. Figure 7-4. Android run configuration for Doom Figure 7-4. Android run configuration for Doom Now let's play some Doom. From...

Info Iaf AndroidSDK

Fri, 17 Feb 2012 22:24:07 GMT

ImageView Ikffi setlmageDrawable Drawable, Mffiil getWallpaper Kimii amp mfei amp kMi Drawable 80B3SM, ImageView -JF i'Jft, getWallpaper JiM7 ContextWrapper it Activity ftXM, flfU import android.app.Activity import android.os.Bundle import android.view.View import android.widget.Button import android.widget.ImageView public class EX05_14 extends Activity private ImageView mylmageView private Button myButton Called when the activity is first created. Override public void onCreate Bundle...

Using DDMS to update location Android Google Sdk

Fri, 17 Feb 2012 13:34:02 GMT

We talked a lot about DDMS the Dalvik Debug Monitor Service in Chapter 5, but two features are related to location updates. The Emulator Control pane of the DDMS screen provides several ways of controlling the running emulator. After switching to the DDMS perspective click on DDMS in the upper right of the Eclipse window , you should see the Emulator Control pane in the middle left of the DDMS window Figure 9-1 . You will probably have to scroll down in that pane to see the controls related to...

Intents Simple LowOverhead IPC Android Google Sdk

Fri, 17 Feb 2012 13:30:32 GMT

The Android system uses Intent objects to enable applications to specify an Activity or Service. Intent objects also deliver data from one application to another, providing a simple and convenient form of IPC. The Intent class, the Activity class, and Android's Intent-based inter-process communication solve one of the user interface problems of smartphone platforms that support multiple separate applications they feel like a collection of separate programs. You don't have the simplicity of...

Video Thumbnails from the MediaStore AndroidMedia

Fri, 17 Feb 2012 01:29:55 GMT

We could, starting with Android 2.0 API Level 5 , pull out the thumbnails associated with each video file from within the loop. We need the ID of the video file that is in our list of columns to select MediaStore.Video.Media._ID , which we can then use in the where clause of the managedQuery. int id String thumbColumns MediaStore.Video.Thumbnails.DATA, Cursor thumbCursor thumbColumns, MediaStore.Video.Thumbnails.VIDEO_ID id, null, null if thumbCursor.moveToFirst

description Mqa Android 1 6 SDK

Thu, 16 Feb 2012 23:35:00 GMT

Declares a broadcast receiver a BroadcastReceiver subclass as one of the application's components. Broadcast receivers enable applications to receive intents that are broadcast by the system or by other applications, even when other components of the application are not running. There are two ways to make a broadcast receiver known to the system One is declare it in the manifest file with this element. The other is to create the receiver dynamically in code and register it with the...

Broadcasting Sticky and Ordered Intents ApplicationDevelopment

Thu, 16 Feb 2012 18:09:53 GMT

When broadcasting an Intent using sendBroadcast, your Intent will be received by all registered Broadcast Receivers, but you cannot control the order and they cannot propagate results. In circumstances where the order in which the Broadcast Receivers receive the Intent is important, or where you require the Receivers to be able to affect the Intent being broadcast, you can use the sendOrderedBroadcast method. Using this method, your Intent will be delivered to all registered Receivers in order...

Available for ApplicationDevelopment

Thu, 16 Feb 2012 12:23:52 GMT

download on RemoteViews views new RemoteViews context.getPackageName , To use Remote Views on widgets, call the static getinstance method to return an instance of the App Widget Manager and use it to find identifiers for each instance of a particular widget class, as in this continuation of Listing 10-5 AppWidgetManager appWidgetManager AppWidgetManager.getlnstance context Retrieve the identifiers for each instance of your chosen widget. ComponentName thisWidget new ComponentName context,...

Audio and Video Bitrates AndroidMedia

Wed, 15 Feb 2012 23:35:23 GMT

Video encoding bitrates can be set using the setVideoEncodingBitrate method on the MediaRecorder and passing in the bitrate requested in bits per second. A low bitrate setting for video would be in the range of 256,000 bits per second 256 kbps , while a high bitrate for video would be in the range of 3,000,000 bits per second 3 mbps . We can also specify the maximum bitrate that we would like used for the encoded audio data. We do so by passing the value as bits per second into the...

Creating Space Blaster Your First Java Game AndroidGames

Wed, 15 Feb 2012 22:40:01 GMT

It's time for the real thing. This section presents the pure Java game Space Blaster. Even though this is an Android game, some code has been reused from a Java applet. Figure 3-2 shows the game in action. The objective of the game is to navigate a space ship through a field of meteors, shooting them up as you go. The ship has a laser weapon and a defensive shield. You can choose to shoot the meteor, dodge it by dragging the ship with your fingertips, or let the shield protect you, but whatever...

Monitoring Data Connectivity and Activity ApplicationDevelopment

Wed, 15 Feb 2012 18:18:50 GMT

As well as voice and service details, you can also use a Phone State Listener to monitor changes in mobile data connectivity and mobile data transfer. The Phone State Listener includes two event handlers for monitoring the device data connection. Override onDataActivity to track data transfer activity, and onDataConnectionStateChanged to request notifications for data connection state changes. Listing 12-12 shows both handlers overridden, with switch statements demonstrating each of the...

Using startActivity vs startActivityForResult AndroidPlatform

Wed, 15 Feb 2012 17:44:42 GMT

The most common way to invoke an Activity is by using the startActivity method, but there is also another method you will see used in specific instances startActivityForResult . Both pass control to a different Activity. The difference with regard to startActivityforResult is that it returns a value to the current Activity when the Activity being invoked is complete. It in effect allows you to chain activities and expect callback-style responses you get the response by implementing the...

MapView and MyLocationOverlay Initialization Android Google Sdk

Wed, 15 Feb 2012 14:13:21 GMT

At startup, and when we select Current Location from the Spinner, we want to display a map of our current location, and we want that map to track us as we move around. For this map we will use the MyLocationOverlay class. When we select a specific location from the Spinner, we want to display a map of that location, turn off location updates, and not track movement. Let's look again at the code in MicroJobs.java that initializes the MapView and the MyLocationOverlay that tracks our current...

Unselected tab icon Light effects and shadows Android 1 6 SDK

Wed, 15 Feb 2012 12:25:23 GMT

Unselected tab icons look just like the selected tab icons, but with a fainter inner shadow, and the same front part gradient as the dialog icons. Figure 10. Light, effects, and shadows for unselected tab icons. 1. Front part gradient overlay angle 90 bottom color r 223 g 223 b 223 top color r 249 g 249 b 249 bottom color location 0 top color location 75 2. Inner black 10 opacity angle 90 distance shadow 2px size 2px 3. Inner bevel depth 1 direction down size 0px angle 90 altitude 10 highlight...

Getting a Signing Certificate While Debugging Android Google Sdk

Wed, 15 Feb 2012 12:09:14 GMT

When you're creating and debugging your application that uses a MapView, or when you're running a demo application like MJAndroid, you still need a valid Map API Key to get map tiles from Google Maps, and you need the fingerprint of your debug signing certificate to obtain a Map API Key. You can't just use the apiKey that we have coded into the MJAndroid source files, because it is tied to the signing certificate that was generated by our debug environment. Your debug environment will generate...

Compiling and Testing the Shared Library AndroidGames

Wed, 15 Feb 2012 11:39:51 GMT

We can now proceed to compile the native library. Listing 2-6 shows the Makefile for this purpose. This file defines the following targets default all This target will build both the library and the test static binary a.out. lib This target will build only the shared library. testlib This target will build a simple program to test the library and make sure there are no missing symbols. jni This target will generate the C header for the native Java class jni.Natives. The output will be stored in...

Integer Primary Key Autoincrement Android 1 6 SDK

Wed, 15 Feb 2012 10:37:13 GMT

The AUTOINCREMENT descriptor is optional. But without it, SQLite increments an ID counter field to the next number above the largest existing number in the column. If you delete the last row, the next row added will have the same ID as the deleted row. AUTOINCREMENT avoids this by having SQLite increment to the next largest value whether deleted or not. Carefully document the data type of each column. Clients need this information to read the data. If you are handling a new data type, you must...

Filling the Layout with Data Android 1 6 SDK

Wed, 15 Feb 2012 10:05:18 GMT

Inserting data into the layout is typically done by binding the AdapterView class to an Adapter, which retireves data from an external source perhaps a list that the code supplies or query results from the device's database . The following code sample does the following 1. Creates a Spinner with an existing View and binds it to a new ArrayAdapter that reads an array of colors from the local resources. 2. Creates another Spinner object from a View and binds it to a new SimpleCursorAdapter that...

ffl mxwftmmToast linearlayout View AndroidSDK

Tue, 14 Feb 2012 14:32:04 GMT

. liljpsiSpBHil ilaliliislPWpi li Gtofrfrm Toasts, nmmttlE Toast fril Ttf amp ltt g jSfW, M - ffXi m Sffi ffiiiJft Toast mm mm WM. Toast MM, amp S Layout Text View gt ImageView Toast gt itH W Toast MM, Toast ffi i ImageView Widget, Drawable Mffi, SU LinearLayout 5.7 RTSMfclSll-Toast LinearLayout View jg MWi WIScSJi- rait, RT OTLinkify JiT, Toast Toast BiffiiP g gt to import android.app.Activity import android.os.Bundle import android.text.util.Linkify import android.view.View import...

Raw Audio Playback with AudioTrack AndroidMedia

Tue, 14 Feb 2012 14:21:00 GMT

AudioTrack is a class in Android that allows us to play raw audio samples. This allows for the playback of audio captured with AudioRecord that otherwise wouldn't be playable using a MediaPlayer object. To construct an AudioTrack object, we need to pass in a series of configuration variables describing the audio to be played. The first argument is the stream type. The possible values are defined as constants in the AudioManager class. We'll be using AudioManager.STREAM_MUSIC, which is the audio...

Supported Audio Formats AndroidMedia

Tue, 14 Feb 2012 13:47:10 GMT

Android supports a variety of audio file formats and codecs for playback it supports fewer for recording, which we'll discuss when we go over recording . AAC Advanced Audio Coding codec as well as both profiles of HE-AAC, High Efficiency AAC , .m4a audio m4a or.3gp audio 3gpp files. AAC is a popular standard that is used by the iPod and other portable media players. Android supports this audio format inside of MPEG-4 audio files and inside of 3GP files which are based on the MPEG-4 format ....

prepareAsyncO Preparing AndroidMedia

Tue, 14 Feb 2012 09:28:54 GMT

Looping true amp amp playback completes Looping true amp amp playback completes Looping false amp amp onCompletlonO invoked on OnCompletionListener Looping false amp amp onCompletlonO invoked on OnCompletionListener Figure 6-1. MediaPlayer state diagram from Android API Reference Figure 6-1. MediaPlayer state diagram from Android API Reference Here is a full MediaPlayer example that uses prepareAsync and implements several listeners to keep track of its state. package import java.io.IOException...

Local Service plus MediaPlayer AndroidMedia

Mon, 13 Feb 2012 14:56:11 GMT

Now that we have created an example Service, we can use it as a template to create an application to play audio files in the background. Here is a Service, and an activity to control the Service that does just that, allows us to play audio files in the background. It works in a similar manner to the custom audio player example from the last chapter, as it is using the same underlying MediaPlayer class that Android makes available to us. package import android.app.Service import...

Creating a New Visual Interface ApplicationDevelopment

Mon, 13 Feb 2012 12:27:49 GMT

The base View class presents a distinctly empty 100-pixel-by-100-pixel square. To change the size of the control and display a more compelling visual interface, you need to override the onMeasure and onDraw methods. Within onMeasure the new View will calculate the height and width it will occupy given a set of boundary conditions. The onDraw method is where you draw on the Canvas. Listing 4-10 shows the skeleton code for a new View class, which will be examined and developed further in the...

Using Context Menus ApplicationDevelopment

Mon, 13 Feb 2012 11:55:06 GMT

Context Menus are contextualized by the currently focused View and are triggered by the user's pressing the trackball, middle D-pad button, or a View for around three seconds. You define and populate Context Menus much as you define and populate Activity Menus. There are two options available for creating Context Menus for a particular View. One option is to create a generic ContextMenu object for a View class by overriding a View's onCreateContextMenu handler, as shown here public void...

Recipe Creating an App Widget Android SDK 2

Mon, 13 Feb 2012 09:33:35 GMT

This recipe creates a simple App Widget that displays some text on the home screen. The text is configured to update every second, but note that by default, the Android system forces the minimum update time to be 30 minutes.This helps avoid poorly written widgets from draining the battery. Listing 3.17 implements an AppWidgetProvider, which is a subclass of BroadcastReceiver.The main method to override is the onUpdate function, which gets called when the system determines it is time to update...

The MapView and MapActivity Android Google Sdk

Sat, 11 Feb 2012 19:57:14 GMT

This book's MJAndroid application needs to be able to add overlays that show the locations for jobs in the area. So instead of using the Google Maps application, we will use a MapView, which we can overlay with as many graphics as we want. You can have only one MapView per Activity, however, and your activity has to extend MapActivity. As you'll see, that's a small price to pay for all the functionality that comes for free. There are a couple of unique prerequisites for using MapViews in your...

Creating a Dynamic Manifest File HTMLApps

Sat, 11 Feb 2012 11:54:28 GMT

Now that you're comfortable with how the offline app cache works, let's apply it to the Kilo example we've been working on. Kilo consists of quite a few files and manually listing them all in a manifest file would be a pain. Plus, a single typo would invalidate the entire manifest file and prevent the application from working offline. Running PHP Scripts on Your Web Server PHP is a versatile web-scripting language, and is supported by most web hosting providers. This means that on most web...

Visualizing Frequencies AndroidMedia

Fri, 10 Feb 2012 21:22:11 GMT

One common way that people typically use to analyze audio is to visualize the frequencies that exist within it. Commonly these types of visuals are employed with equalizers that allow the adjustment of the levels of various frequency ranges. The technique used to break an audio signal down into component frequencies employs a mathematic transformation called a discrete Fourier transform DFT . A DFT is commonly used to translate data from a time base to a frequency base. One algorithm used to...

Raw Audio Capture and Playback Example AndroidMedia

Fri, 10 Feb 2012 17:39:35 GMT

Here is a full example that records using AudioRecord and plays back using AudioTrack. Each of these operations lives in their own thread through the use of AsyncTask, so that they don't make the application become unresponsive by running in the main thread. package import java. import java. import java. import java. import java. import java. import java. import java. import android.view.View.OnClickListener public class AltAudioRecorder extends Activity implements OnClickListener We have two...

The component name is set by setComponent setClass or setClassName and read by getComponent Action Android 1 6 SDK

Fri, 10 Feb 2012 13:11:55 GMT

A string naming the action to be performed or, in the case of broadcast intents, the action that took place and is being reported. The Intent class defines a number of action constants, including these The URI of the data to be acted on and the MIME type of that data. Different actions are paired with different kinds of data specifications. For example, if the action field is ACTION EDIT, the data field would contain the URI of the document to be displayed for editing. If the action is...

Where Am I Example ApplicationDevelopment

Fri, 10 Feb 2012 07:13:37 GMT

The following example Where Am I features a new Activity that finds the device's current location using the GPS Location Provider. You will expand on this example throughout the chapter as you learn new geographic functionality. This example assumes that you have enabled the gps_provider Location Provider using the techniques shown previously in this chapter, or that you're running it on a device that supports GPS and has that hardware enabled. 1. Create a new Where Am I project with a WhereAmi...

Forward Geocoding ApplicationDevelopment

Fri, 10 Feb 2012 02:40:53 GMT

Forward geocoding or just geocoding determines map coordinates for a given location. What constitutes a valid location varies depending on the locale geographic area within which you're searching. Generally, it will include regular street addresses of varying granularity from country to street name and number , postcodes, train stations, landmarks, and hospitals. As a general guide, valid search terms will be similar to the addresses and locations you can enter into the Google Maps search bar....

gartH6Jtituyunmnmr mm AndroidSDK

Thu, 09 Feb 2012 16:20:27 GMT

Android API 41 ft TelephonyManager fr amp Rmftjtifcfc SIM - AMte amp Sffi Ji. TelephonyManager H amp ftl SIM -Ftti amp Sffl Ji., g feXM MyAdapter MJa X setListAdapter MyAdpter ftit HM f ListView import ii class import java.util.ArrayList import java.util.List import android.app.ListActivity import android.os.Bundle import android.telephony.TelephonyManager public class EX05_18 extends ListActivity private List lt String gt item new ArrayList lt String gt private List lt String gt value new...

Reading Data Connection and Transfer State ApplicationDevelopment

Wed, 08 Feb 2012 17:58:07 GMT

Using the getDataState and getDataActivity methods you can find the current data connection state and transfer activity respectively as shown in Listing 12-4. Generally it will be more useful to detect changes in the data connection or transfer status. You'll learn how to monitor both later in this chapter. LISTING 12-4 Reading phone data connection and transfer state int dataActivity telephonyManager.getDataActivity int dataState telephonyManager.getDataState case...

Using Intent Filters for PlugIns and Extensibility ApplicationDevelopment

Tue, 07 Feb 2012 23:04:36 GMT

You've now learned how to create implicit Intents to launch Activities, but that's only half the story. Android also lets future packages provide new functionality for existing applications, using Intent Filters to populate menus dynamically at run time. This provides a plug-in model for your Activities that lets them take advantage of future functionality, provided through application components you haven't yet conceived of, without your having to modify or recompile your projects. The...

Download the Android SDK HTMLApps

Tue, 07 Feb 2012 14:14:12 GMT

PhoneGap works in conjunction with the Android SDK, so before we can get started with PhoneGap, we need to download and install the Android SDK itself. Follow the steps here to do so 1. Navigate to the Android SDK download page and download the package appropriate for your platform. If you are on Windows or Linux, you will need to install Java see http java.sun.com javase downloads first. My development machine is a MacBook Pro running Mac OS X 10.6, so in my case, the appropriate package is...

Gallery and GridView Android Google Sdk

Tue, 07 Feb 2012 11:17:00 GMT

The Gallery ViewGroup Figure 11-4 displays multiple items in a horizontally scrolling list. The currently selected item is locked in the center of the screen. Any items that approach the edge of the screen begin to fade, giving the user the impression that there may be more items around the corner. The user can scroll horizontally through the items within the gallery. This ViewGroup is useful when you want to present a large set of possible choices to the user without using too much screen real...

Adding Video Metadata AndroidMedia

Tue, 07 Feb 2012 08:39:44 GMT

As we discussed in Chapter 9, Android's MediaStore content provider has a portion, MediaStore.Video, dedicated to video in addition to the portions for image and audio files and metadata that we have previously looked at. When triggering the Camera application via an intent, the Uri to the newly recorded video file that is returned is a content style Uri, which is used in combination with a content provider in this case, the MediaStore. In order to add additional metadata, we can use the Uri...

Recipe Using a SeekBar Android SDK 2

Mon, 06 Feb 2012 14:58:34 GMT

A seek bar is similar to a progress bar that can take user input to change the amount of progress. Current progress is indicated by a small sliding box called a thumb. A user can click and drag the thumb to visually indicate the new place to set the progress.The main activity is shown in Listing 4.23. Listing 4.23 import android.app.Activity import android.os.Bundle import android.widget.SeekBar public class SeekBarEx extends Activity public void onCreate Bundle savedInstanceState...

Info Bci AndroidSDK

Fri, 03 Feb 2012 12:42:03 GMT

decodeByteArray byte data, int offset, int length, BitmapFactory. Options opts decodeFile String pathName, BitmapFactory.Options opts RXWto amp B am amp ltl Decode Bitmap decodeFileDescriptor FileDescriptor fd, Rect outPadding, BitmapFactory.Options opts decodeFileDescriptor FileDescriptor fd decodeResource Resources res, int id decodeResource Resources res, int id, BitmapFactory.Options opts decodeStream InputStream is, Rect outPadding, BitmapFactory.Options opts Android SDK 7 Gallery ft...

Drawables Android Google Sdk

Fri, 03 Feb 2012 09:41:00 GMT

A Drawable is an object that knows how to render itself on a Canvas. Because a Drawable has complete control during rendering, even a very complex rendering process can be encapsulated in a way that makes it fairly easy to use. Examples 12-7 and 12-8 show the changes necessary to implement the previous example, Figure 12-3, using a Drawable. The code that draws the red and green text has been refactored into a HelloAndroidTextDrawable class, used in rendering by the widget's onDraw method....

Altering Contrast and Brightness AndroidMedia

Thu, 02 Feb 2012 23:22:52 GMT

Adjusting the brightness and contrast of an image can be done by increasing or decreasing the color values. This code will double the intensity of each color channel, which affects both the brightness and contrast in an image as illustrated in Figure 3-15 ColorMatrix cm new ColorMatrix float contrast 2 cm.set new float contrast, 0, 0, 0, 0, 0, contrast, 0, 0, 0, 0, 0, contrast, 0, 0, 0, 0, 0, 1, 0 paint.setColorFilter new ColorMatrixColorFilter cm Figure 3-15. ColorMatrix with each color's...

Interacting with the phone AndroidPlatform

Thu, 02 Feb 2012 14:36:49 GMT

In your day-to-day development you will often want to interact with the phone. This interaction may be as simple as dialing outbound calls through built-in intents, or it may involve intercepting calls to modify them in some way. In this section we are going to cover these basic tasks, and we will examine some of the phone number utilities Android provides for you out of the box. One of the more common things you will do with the Android telephony support doesn't involve the telephony APIs...

Debugging with strace AndroidGames

Wed, 01 Feb 2012 21:29:53 GMT

For some reason, the native test program for the library runs in version 1.0 R2 of the SDK, but fails to load in 1.5 R2. The output gives a clue the file bionic linker linker.c 1581 fails to load the library. There is a simple Linux tool called strace that can help in this situation. The strace tool runs the specified command until it exits. It intercepts and records the system calls that are called by a process and the signals that are received by a process. The name of each system call, its...

Using Custom Controls ApplicationDevelopment

Tue, 31 Jan 2012 20:42:19 GMT

Having created your own custom Views, you can use them within code and layouts as you would any other View. Listing 4-15 shows you how to override the onCreate method in order to add the CompassView, created in the preceding example, to an Activity. public void onCreate Bundle savedInstanceState super.onCreate savedInstanceState CompassView cv new CompassView this setContentView cv To use the same control within a layout resource, specify the fully qualified class name when you create a new...

Extracting Results from a Cursor ApplicationDevelopment

Tue, 31 Jan 2012 07:09:50 GMT

To extract values from a result Cursor, first use the moveTo lt location gt methods described earlier to position the cursor at the correct row of the result Cursor. Then use the type safe get lt type gt methods passing in a column index to return the value stored at the current row for the specified column, as shown in the following snippet. String columnValue myResult.getString columnIndex Database implementations should publish static constants that provide the column names and or indexes...

Using Intents to Import System Preference Screens ApplicationDevelopment

Mon, 30 Jan 2012 11:20:07 GMT

As well as your own Preference Screens, preference hierarchies can include Preference Screens from other applications including system Preference Screens. You can invoke any Activity within your Preference Screen using an Intent. If you add an Intent node within any Preference Screen element, the system will interpret this as a request to call startActivity using the specified action. This is particularly useful for including links to relevant system Preference Screens within your own...

Fundamental Android Ui Design ApplicationDevelopment

Sun, 29 Jan 2012 11:29:45 GMT

User interface UI design, user experience UX , human computer interaction HCI , and usability are huge topics that aren't covered in great depth in this book. Nonetheless, it's important that you get them right when creating your user interfaces. Android introduces some new terminology for familiar programming metaphors that will be explored in detail in the following sections gt Views Views are the base class for all visual interface elements commonly known as controls or widgets . All UI...

Example Determining the State of a Call Android Google Sdk

Sun, 29 Jan 2012 00:01:07 GMT

This section shows how to track the state of a phone call. It adds some of the classes described in the previous section to the application shown in Creating an Example Application to Run the call Method on page 278, which finds and uses PhoneApp to start and control a phone call. Here, in addition to starting a phone call and letting PhoneApp control it, the application gets some information about the call as it is happening. In order to get this information, we need to extend the...

In Practice 1 Android Games 2

Sat, 28 Jan 2012 08:39:32 GMT

Let's write an example for this fine API. We want to keep track of ten fingers at most there's no device yet that can track more, so we are on the safe side here . Android will assign pointer identifiers from 0 to 9 to these fingers in the sequence they touch the screen. So we keep track of each pointer identifier's coordinates and touch state touching or not , and output this information to the screen via a TextView. Let's call our test activity MultiTouchTest. Listing 4-4 shows the complete...

Creating a Wallpaper Service Engine ApplicationDevelopment

Tue, 24 Jan 2012 10:07:14 GMT

The WallpaperService.Engine class is where you create the Live Wallpaper itself. The Wallpaper Service Engine encapsulates a Surface which is used to display the wallpaper and handle touch events. A Surface is a specialized drawing canvas that supports updates from background threads, making it ideal for creating smooth, dynamic, and interactive graphics. Both the Surface View, and handling touch events, are covered in more detail in Chapter 15. To implement your own Wallpaper Service engine,...

a imm AndroidSDK

Fri, 20 Jan 2012 06:12:08 GMT

import j ava.io.BufferedOutputStream import j ava.io.FileNotFoundException import j ava.io.FileOutputStream import java.io.IOException import java.util.Properties import android.app.Activity import android.content.Intent import android.os.Bundle import android.view.View import android.widget.Button import android.widget.TextView public class EX10_03 extends Activity public static String fileName mc.ini public static String mcdate_key mcdate private String mcdate_value MC J SS public static...

Playing Video Using the Video View ApplicationDevelopment

Thu, 19 Jan 2012 19:49:18 GMT

The simplest way to play back video is to use the VideoView control. The Video View includes a Surface on which the video is displayed and encapsulates and manages a Media Player to manage the video playback. The Video View supports the playback of local or streaming video as supported by the Media Player component. Video Views conveniently encapsulate the initialization of the Media Player. To assign a video to play, simply call setVideoPath or setVideoUri to specify the path to a local file,...

Checkable menu items Android 1 6 SDK

Thu, 19 Jan 2012 13:07:43 GMT

Any menu item can be used as an interface for turning options on and off. This can be indicated with a checkbox for stand-alone options, or radio buttons for groups of mutually exlusive options see the screenshot, to the right . Note Menu items in the Icon Menu cannot display a checkbox or radio button. If you choose to make items in the Icon Menu checkable, then you must personally indicate the state by swapping the icon and or text each time the state changes between on and off. To make a...

Canvas Drawing Android Google Sdk

Fri, 13 Jan 2012 13:43:38 GMT

Now that we've explored how widgets allocate the space on the screen in which they draw themselves, we can turn to coding some widgets that actually do some drawing. The Android framework handles drawing in a way that should be familiar, now that you've read about measurement and arrangement. When some part of the application determines that the current screen drawing is stale because some state has changed, it calls the View method invalidate. This call causes a redraw event to be added to the...

x8632 cont AndroidPorting

Fri, 13 Jan 2012 01:03:44 GMT

chmod x release-sourceforge android pxa270 scripts bin mkimage Setup Compiling Options This step _could be ignored _ make menuconfig under release-sourceforge android-pxa270 directory Please enter a string value, use the lt TAB gt key to move from the input field to the buttons below it. -i686-pc - linux-gnu. tar, bz2 riux-2 . 6 . 25-androld-l, a rl Android 1.6 SDK, Release Use our pre-build Android root file system directly Compile from our modified Android source code Do you wishjv o save...

Sensors Android SDK 2

Wed, 11 Jan 2012 21:43:35 GMT

Smartphones are becoming sensor hubs in a way, opening a rich experience for users. Other than the microphone that every phone has, the first additional sensor introduced on phones was the camera. Different phone cameras have varying capabilities, and this is an important factor for people in selecting a device.The same type of diversity is now seen with the additional sensors. Most smartphones have at least three basic sensors a three-axis accelerometer to measure gravity, a three-axis...

Image Capture Using the BuiltIn Camera Application AndroidMedia

Wed, 11 Jan 2012 12:07:27 GMT

With mobile phones quickly becoming mobile computers, they have in many ways replaced a whole variety of consumer electronics. One of the earliest non-phone related hardware capabilities added to mobile phones was a camera. Currently, it seems someone would be hard pressed to buy a mobile phone that doesn't include a camera. Of course, Android-based phones are no exception from the beginning, the Android SDK has supported accessing the built-in hardware camera on phones to capture images. The...

Testing the Scripts AndroidGames

Tue, 10 Jan 2012 05:50:22 GMT

Save the scripts in Listings 1-2 and 1-3 as agcc and ald in your HOME bin directory. Then issue the following commands to test them arm-none-linux-gnueabi-gcc Sourcery G Lite 2008q3-72 4.3.2 Copyright C 2008 Free Software Foundation, Inc. This is free software see the source for copying conditions. There is NO warranty not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. arm-none-linux-gnueabi-ld warning library search path is unsafe for cross-compilation GNU ld Sourcery G Lite...

Inserting Media into the Media Store ApplicationDevelopment

Mon, 09 Jan 2012 02:27:37 GMT

Rather than relying on the Media Scanner you can add new media to the Media Store by creating a new ContentValues object and inserting it into the appropriate Media Store Content Provider yourself. The metadata you specify here can include the title, time stamp, and geocoding information for your new media file, as shown in the code snippet below ContentValues content new ContentValues 3 content.put Audio.AudioColumns.TITLE, TheSoundandtheFury System.currentTimeMillisO 1000 content.put...

Recipe Using Sound Resources Efficiently Android SDK 2

Tue, 03 Jan 2012 15:29:48 GMT

To keep the smaller memory requirements of compressed audio files but also the benefit of lower-latency playback of raw audio files, the SoundPool class can be used.This uses the MediaPlayer service to decode audio and provides methods to repeat sound buffers and also speed them up or slow them down. Usage is similar to other sound recipes initialize, load a resource, play, and release. However, note that the SoundPool launches a background thread, so a play right after a load might not produce...

Info Ugi AndroidSDK

Tue, 03 Jan 2012 11:12:26 GMT

nmmr setTextColor MMM Mfi, M setTextColor graphics. Color fjgfeffl Color. import android.graphics.Color import android.os.Bundle import android.view.View widget. TextView tt l ffi TestView import android.widget.TextView public class Ex03_13 extends Activity private Button mButton private TextView mText private int mColors private int colornum Called when the activity is first created. Override public void onCreate Bundle savedlnstanceState super.onCreate savedlnstanceState setContentView...

Drawing on Existing Images AndroidMedia

Mon, 02 Jan 2012 08:24:58 GMT

Since we are drawing on a Canvas, we can use techniques described in the previous chapter to draw an image to the Canvas and then draw on top of that image. package import java.io.FileNotFoundException import android.app.Activity import android.content.Intent import android.graphics.Bitmap import android.graphics.BitmapFactory import android.graphics.Canvas import android.graphics.Color import android.graphics.Matrix import android.graphics.Paint import android.net.Uri import android.os.Bundle...

Create New Documents AndroidManual

Sat, 31 Dec 2011 15:40:52 GMT

Documents To Go Full gives you the ability to create new Microsoft Word, Excel and PowerPoint documents on your device. Your newly created documents can be synchronized back to your desktop after your next synchronization or saved locally on your device only. To create a new document, press the Menu button, then choose Create New Document OR press the softkey at the bottom of the screen. Note By default, the new documents you create will be in Microsoft Office 97-2004 e.g., .doc, .xls, .ppt ....

Network Video Playback AndroidMedia

Mon, 26 Dec 2011 05:14:46 GMT

Android supports HTTP and RTSP video playback in all three video playback methods discussed in Chapter 9. Using either the built-in Media Player activity via an intent or the VideoView class to play either form of network video requires no source code changes. Simply use the HTTP or RTSP URL as the video Uri, and it will work as long as the format is supported. Here is the ViewTheVideo activity example from Chapter 9 that uses a VideoView with an RTSP URL to a video from YouTube's mobile site....

Part 5 Bvn Android vs iOS

Mon, 26 Dec 2011 05:13:57 GMT

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Linkify Demo Android Google Sdk

Mon, 26 Dec 2011 04:26:37 GMT

This technique should work for demos that you can't find with the previous method. If the ApiDemos application doesn't store information about the demo in res strings.xml, it gets its information directly from AndroidManifest.xml and so will we. 1. After starting the ApiDemos application, find the particular demo through clicking on the menu, and remember the path you took through the menu system. In this case, you click on Text and then Linkify. 2. Open the AndroidManifest.xml file and search...

Creating Compound Controls ApplicationDevelopment

Thu, 22 Dec 2011 22:14:59 GMT

Compound controls are atomic, reusable Views that contain multiple child controls laid out and wired together. When you create a compound control you define the layout, appearance, and interaction of the Views it contains. You create compound controls by extending a ViewGroup usually a layout . To create a new compound control choose the layout class that's most suitable for positioning the child controls, and extend it as shown in Listing 4-6. LISTING 4-6 Creating a compound control...

Best File Server App Best Android Apps

Mon, 19 Dec 2011 08:37:57 GMT

Suppose you are traveling and want to share your files with colleagues but your company email is down. Fire up an FTP server and let your colleagues get whatever you designate for retrieval. Once you set this app up, you simply run the server and it will provide you with a server URL that can be shared , with whomever you want accessing files. Whether you have music files, pictures, documents, or log files, you can make them easily accessible with 42 this app. MINIMALIST DESIGN The design is...

Recipe Scheduling a Runnable Task from the Main Thread Android SDK 2

Mon, 19 Dec 2011 04:00:51 GMT

This recipe implements a clock timer, which is often needed in applications. For example, it can be used in a game to keep track of how long a player takes to complete a level. This provides a simple way to handle user interaction while a background thread continues to run. The timer is run in a background thread so it does not block the UI thread, but it needs to update the UI whenever the time changes.As shown in Listing 3.5, the TextView text starts with a welcome message and the button text...

Recipe Listening for Phone States Android SDK 2

Sun, 18 Dec 2011 21:54:53 GMT

The PhoneStateListener class provides information about the different telephony states on the device, including network service state, signal strength, and message waiting indicator voicemail . Some require an explicit permission as shown in Table 7.2. Table 7.2 The Possible Phone State Listener Events and Required Permissions LISTEN_CELL_LOCATION LISTEN_DATA_ACTIVITY Listen for call forward indicator changes Listen for direction of data traffic on cellular changes Listen for data connection...

Listing 917 srccomcookbookdatastorageDisplayDiariesjava Android SDK 2

Sat, 17 Dec 2011 00:08:12 GMT

import java.text.DateFormat import java.util.ArrayList import java.util.Date import android.content.Context import android.database.Cursor import android.view.ViewGroup import android.widget.BaseAdapter import com.cookbook.data.Constants import com.cookbook.data.MyDB public class DisplayDiaries extends ListActivity MyDB dba DiaryAdapter myAdapter private class MyDiary public MyDiary String t, String c, String r title t content c recorddate r public String title public String content public...

Installing KiloGap in the Emulator HTMLApps

Thu, 15 Dec 2011 19:43:33 GMT

Now it's time to test our shiny new native Android app in the emulator. 1. If your emulator is not running, launch it by entering the following command in the Terminal application this way, you can let it warm up while you're building the Kilo package You should see the Android emulator window appear after a few seconds. Notice that the command prompt doesn't return in the terminal window it will sort of just sit there and hang until you close the emulator. We won't be interacting with this...