Re: [android-developers] Digest for [email protected] - 14 Messages in 9 Topics

Wed, 26 Dec 2012 23:03:42 -0800

Tyu
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  Today's Topic Summary

Group: http://groups.google.com/group/android-developers/topics

 How to start again if some third party task killer has killed my app ?
    Amit Dwivedi <[email protected]> Dec 26 10:02PM -0800  

    In my App I have several activities which are obviously related to each
    other. Whenever I am on some activity and the user kills my app by using
    any task killer. I want to do two things
     
     
    1. Clear the Notification which I added when the user logged in..
    2. finish all the activities other than the first Activity i.e. Login
    Activity
     
    Now if user starts again my app either from the recent tasks or from
    launcher I want to start from the first activity i.e. Login Activity...
     
    Presently my code works absolutely fine if I use android *manage process* and
    end the activity or force close the app from *android task manager*. But if
    I am using some other task killer app i.e. Advanced task killer, after
    closing the app when I relaunch the App from recent apps the it tries to
    restart from the last used Activity instead of Login Activty and gives an
    ugly force close error and when I click close it redirects me back to Login
    Activity... The Notification is also not cleared when in this case.
     
    How do I handle third party task killers ?
     
    I have read several threads on SO but couldn't get the pointers, few of
    them are ...

     

 how to query from two unrelated tables and display data in same listview
    Vijay Krishnan <[email protected]> Dec 27 11:16AM +0530  

    Hi skink,
     
    cursors point to different tables and tables have different
    column names.How do i know that this cursor points to this table?
    How do i display data from different tables?
    Regards,
    vijay.k
     

     

 Can two applications that run in the same process have different STATIC object values?
 Camera app bombs, using Android Docs examples.
    JDog <[email protected]> Dec 26 03:01PM -0800  

    Hello I tried to create a simple camera app with code snippets from the
    google android doc's. I dont know what I'm doing wrong but it bombs on
    startup. All other code coming from my eclipse ide to android works ok so I
    know its not that. I'm old Delphi programmer and know I have much to learn,
    but believe it may be in structure of my classes and sub-routines or calls
    to surface holder thats screwing it up. Heck it could be my crazy
    bracketing lol. it validates ok. If someone can look at please do....
    Thank Jay Steele
     
    videorecorder.java
     
    package com.tcs.video;
     
    import java.io.File;
    import java.io.IOException;
    import java.text.SimpleDateFormat;
    import java.util.Date;
     
    import com.tcs.video.R.id;
     
     
    import android.annotation.SuppressLint;
    import android.annotation.TargetApi;
    import android.app.Activity;
    import android.content.Context;
    import android.content.pm.ActivityInfo;
    import android.hardware.Camera;
    import android.media.CamcorderProfile;
    import android.media.MediaRecorder;
    import android.net.Uri;
    import android.os.Build;
    import android.os.Bundle;
    import android.os.Environment;
    import android.util.Log;
    import android.view.Menu;
    import android.view.MenuItem;
    import android.view.Surface;
    import android.view.SurfaceHolder;
    import android.view.SurfaceView;
    import android.view.View;
    import android.widget.Button;
    import android.widget.FrameLayout;
     
    @SuppressLint("ViewConstructor")
    @TargetApi(Build.VERSION_CODES.FROYO)
    public class VideoRecorder extends Activity{

    /** A safe way to get an instance of the Camera object. */
    public static Camera getCameraInstance(){
    Camera c = null;
    try {
    c = Camera.open(); // attempt to get a Camera instance
    }
    catch (Exception e){
    // Camera is not available (in use or does not exist)
    }
    return c; // returns null if camera is unavailable
    }

     
    private Camera mCamera;
    private CameraPreview mPreview;
    private MediaRecorder mMediaRecorder;
    private boolean isRecording = false;
    public static final int MEDIA_TYPE_IMAGE = 1;
    public static final int MEDIA_TYPE_VIDEO = 2;
    private static final String TAG = "";

    @Override
    public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main1);


    // Create an instance of Camera
    mCamera = getCameraInstance();
    // Create our Preview view and set it as the content of our
    activity.
    mPreview = new CameraPreview(this, mCamera);
    FrameLayout preview = (FrameLayout)
    findViewById(R.id.camera_preview);
    preview.addView(mPreview);}

    private boolean prepareVideoRecorder(){
    mMediaRecorder = new MediaRecorder();
     
    // Step 1: Unlock and set camera to MediaRecorder
    mCamera.unlock();
    mMediaRecorder.setCamera(mCamera);
     
    // Step 2: Set sources
    //
    mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.CAMCORDER);

    mMediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
     
    // Step 3: Set a CamcorderProfile (requires API Level 8 or
    higher)

    mMediaRecorder.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_HIGH));
     
    // Step 4: Set output file

    mMediaRecorder.setOutputFile(getOutputMediaFile(MEDIA_TYPE_VIDEO).toString());
     
    // Step 5: Set the preview output

    mMediaRecorder.setPreviewDisplay(mPreview.getHolder().getSurface());


    // Step 6: Prepare configured MediaRecorder
    try {
    mMediaRecorder.prepare();
    } catch (IllegalStateException e) {
    Log.d(TAG, "IllegalStateException preparing
    MediaRecorder: " + e.getMessage());
    releaseMediaRecorder();
    return false;
    } catch (IOException e) {
    Log.d(TAG, "IOException preparing MediaRecorder: " +
    e.getMessage());
    releaseMediaRecorder();
    return false;
    }
    return true;
    }
     
    private static Uri getOutputMediaFileUri(int type){
    return Uri.fromFile(getOutputMediaFile(type));
    }
     
    /** Create a File for saving an image or video */
    private static File getOutputMediaFile(int type){
    // To be safe, you should check that the SDCard is mounted
    // using Environment.getExternalStorageState() before doing
    this.
     
    File mediaStorageDir = new
    File(Environment.getExternalStoragePublicDirectory(
    Environment.DIRECTORY_PICTURES), "MyCameraApp");
    // This location works best if you want the created images to
    be shared
    // between applications and persist after your app has been
    uninstalled.
     
    // Create the storage directory if it does not exist
    if (! mediaStorageDir.exists()){
    if (! mediaStorageDir.mkdirs()){
    Log.d("MyCameraApp", "failed to create directory");
    return null;
    }
    }
     
    // Create a media file name
    String timeStamp = new
    SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
    File mediaFile;
    if (type == MEDIA_TYPE_IMAGE){
    mediaFile = new File(mediaStorageDir.getPath() +
    File.separator +
    "IMG_"+ timeStamp + ".jpg");
    } else if(type == MEDIA_TYPE_VIDEO) {
    mediaFile = new File(mediaStorageDir.getPath() +
    File.separator +
    "VID_"+ timeStamp + ".mp4");
    } else {
    return null;
    }
     
    return mediaFile;
    }
     
    private void releaseMediaRecorder() {
    if (mMediaRecorder != null) {
    mMediaRecorder.reset(); // clear recorder configuration
    mMediaRecorder.release(); // release the recorder object
    mMediaRecorder = null;
    mCamera.lock(); // lock camera for later use
    mCamera.release(); // release the camera for other
    applications
    mCamera = null;}

     



     
    // Add a listener to the Capture button


    final Button captureButton = (Button) findViewById(id.button_capture);
    captureButton.setOnClickListener(
    new View.OnClickListener() {
    @Override
    public void onClick(View v) {
    if (isRecording) {
    // stop recording and release camera
    mMediaRecorder.stop(); // stop the recording
    releaseMediaRecorder(); // release the MediaRecorder
    object
    mCamera.lock(); // take camera access back from
    MediaRecorder
     
    // inform the user that recording has stopped
    //setCaptureButtonText("Capture");
    captureButton.setText("Capture");
    isRecording = false;
    } else {
    // initialize video camera
    if (prepareVideoRecorder()) {
    // Camera is available and unlocked, MediaRecorder
    is prepared,
    // now you can start recording
    mMediaRecorder.start();
     
    // inform the user that recording has started
    // setCaptureButtonText("Stop");
    captureButton.setText("Stop");
    isRecording = true;
    } else {
    // prepare didn't work, release the camera
    releaseMediaRecorder();
    // inform user
    }
    }
    }
    }
    );
    }
    }
     
    Camerapreview.java
     
     
    package com.tcs.video;
     
    import java.io.IOException;
     
    import android.annotation.TargetApi;
    import android.app.Activity;
    import android.content.Context;
    import android.hardware.Camera;
    import android.os.Build;
    import android.os.Bundle;
    import android.util.Log;
    import android.view.SurfaceView;
    import android.view.View;
    import android.widget.Button;
    import android.view.SurfaceHolder;
     
    @TargetApi(Build.VERSION_CODES.FROYO)
     
    /** A basic Camera preview class */
    public class CameraPreview extends SurfaceView implements
    SurfaceHolder.Callback {
    private SurfaceHolder mHolder;
    private Camera mCamera;
    private static final String TAG = "";
    public CameraPreview(Context context, Camera camera) {
    super(context);
    mCamera = camera;
     
    // Install a SurfaceHolder.Callback so we get notified when the
    // underlying surface is created and destroyed.
    mHolder = getHolder();
    mHolder.addCallback(this);
    // deprecated setting, but required on Android versions prior to 3.0
    mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
    }
     
    public void surfaceCreated(SurfaceHolder holder) {
    // The Surface has been created, now tell the camera where to draw
    the preview.
    try {
    mCamera.setPreviewDisplay(holder);
    mCamera.startPreview();
    } catch (IOException e) {
    Log.d(TAG, "Error setting camera preview: " + e.getMessage());
    }
    }
     
    public void surfaceDestroyed(SurfaceHolder holder) {
    // empty. Take care of releasing the Camera preview in your
    activity.
    }
     
    public void surfaceChanged(SurfaceHolder holder, int format, int w, int
    h) {
    // If your preview can change or rotate, take care of those events
    here.
    // Make sure to stop the preview before resizing or reformatting it.
     
    if (mHolder.getSurface() == null){
    // preview surface does not exist
    return;
    }
     
    // stop preview before making changes
    try {
    mCamera.stopPreview();
    } catch (Exception e){
    // ignore: tried to stop a non-existent preview
    }
     
    // set preview size and make any resize, rotate or
    // reformatting changes here
     
    // start preview with new settings
    try {
    mCamera.setPreviewDisplay(mHolder);
    mCamera.startPreview();
     
    } catch (Exception e){

    Log.d(TAG, "Error starting camera preview: " + e.getMessage());
    }
    }

    main1.xml
    <?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
     
    <FrameLayout
    android:id="@+id/camera_preview"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:layout_weight="1"
    />
     
    <Button
    android:id="@+id/button_capture"
    android:text="Capture"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center"
    />
    </LinearLayout>

     

    TreKing <[email protected]> Dec 26 05:16PM -0600  


    > I dont know what I'm doing wrong but it bombs on startup.
     
     
    You can't just tell us "it bombs" and post your code and hope someone will
    debug this for you. Have you debugged this at all? Do you at least have a
    stacktrace with an error that tells more about "the bomb" ?
     
    -------------------------------------------------------------------------------------------------
    TreKing <http://sites.google.com/site/rezmobileapps/treking> - Chicago
    transit tracking app for Android-powered devices

     

 google play store reply comments
    TreKing <[email protected]> Dec 26 05:10PM -0600  


    > Why I can not reply comments to my app in store?
     
     
    You are not one of Google's hand-picked special developers that can acquire
    such privileges. Welcome to the club!
     
    Is there anyway to reply?
     
     
    1 - Become one of the aforementioned special developers OR
    2 - Wait until the feature becomes available for us mere mortals.
     
    -------------------------------------------------------------------------------------------------
    TreKing <http://sites.google.com/site/rezmobileapps/treking> - Chicago
    transit tracking app for Android-powered devices

     

 OnStop and OnDestroy aren`t invoked after calling finish()
    RichardC <[email protected]> Dec 26 02:30PM -0800  

    Have you experimented with "Don't keep activities" in Settings > Developer
    options?
     
    On Wednesday, December 26, 2012 4:17:06 PM UTC, latimerius wrote:

     

    Latimerius <[email protected]> Dec 26 11:36PM +0100  

    On Wed, Dec 26, 2012 at 11:30 PM, RichardC
     
    > Have you experimented with "Don't keep activities" in Settings > Developer
    > options?
     
    Nope, I haven't touched that (yet).

     

 Android Live wallpaper launch in jelly bean
 writing a layout w/ standard ICS buttons
 Android Assets
    Nikolay Elenkov <[email protected]> Dec 26 06:37PM +0900  

    On Wed, Dec 26, 2012 at 5:27 PM, Shubham Aggarwal
    > process user's bitmap image.
    > So, rather than sending the data for both I would like to send the data for
    > only user's image.
     
    That still doesn't make much sense, at least to me. You have to read something
    from disk, Java or C doesn't usually matter, especially since some of the Java
    I/O routines are done in native code anyway. What you do afterwards with that
    data is another matter altogether.
     
    At any rate, what the asset manager does it read some compressed data from
    the APK, and if you look at the code for AssetManager, etc. you should be able
    to reproduce it in native code, if that is really what you want. IIRC,
    some (most?)
    of it is natvie already. Or, just copy the thing to a regular file
    using Java code on
    first run an use normal fopen(), etc..

     

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