Android: Memory leak due to AsyncTask
- by Manu
Hello,
I'm stuck with a memory leak that I cannot fix. I identified where it occurs, using the MemoryAnalizer but I vainly struggle to get rid of it. Here is the code:
public class MyActivity extends Activity implements SurfaceHolder.Callback {
...
Camera.PictureCallback mPictureCallbackJpeg = new Camera.PictureCallback() {
public void onPictureTaken(byte[] data, Camera c) {
try {
// log the action
Log.e(getClass().getSimpleName(), "PICTURE CALLBACK JPEG: data.length = " + data);
// Show the ProgressDialog on this thread
pd = ProgressDialog.show(MyActivity.this, "", "Préparation", true, false);
// Start a new thread that will manage the capture
new ManageCaptureTask().execute(data, c);
}
catch(Exception e){
AlertDialog.Builder dialog = new AlertDialog.Builder(MyActivity.this);
...
dialog.create().show();
}
}
class ManageCaptureTask extends AsyncTask<Object, Void, Boolean> {
protected Boolean doInBackground(Object... args) {
Boolean isSuccess = false;
// initialize the bitmap before the capture
((myApp) getApplication()).setBitmapX(null);
try{
// Check if it is a real device or an emulator
TelephonyManager telmgr = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
String deviceID = telmgr.getDeviceId();
boolean isEmulator = "000000000000000".equalsIgnoreCase(deviceID);
// get the bitmap
if (isEmulator) {
((myApp) getApplication()).setBitmapX(BitmapFactory.decodeFile(imageFileName));
} else {
((myApp) getApplication()).setBitmapX(BitmapFactory.decodeByteArray((byte[]) args[0], 0, ((byte[])args[0]).length));
}
((myApp) getApplication()).setImageForDB(ImageTools.resizeBmp(((myApp) getApplication()).getBmp()));
// convert the bitmap into a grayscale image and display it in the preview
((myApp) getApplication()).setImage(makeGrayScale());
isSuccess = true;
}
catch (Exception connEx){
errorMessageFromBkgndThread = getString(R.string.errcapture);
}
return isSuccess;
}
protected void onPostExecute(Boolean result) {
// Pass the result data back to the main activity
if (MyActivity.this.pd != null) {
MyActivity.this.pd.dismiss();
}
if (result){
((ImageView) findViewById(R.id.apercu)).setImageBitmap(((myApp) getApplication()).getBmp());
((myApp) getApplication()).setBitmapX(null);
}
else{
// there was an error
ErrAlert();
}
}
}
};
private void ErrAlert(){
// notify the user about the error
AlertDialog.Builder dialog = new AlertDialog.Builder(this);
...
dialog.create().show();
}
}
MemoryAnalyzer indicated the memory leak at:
((myApp) getApplication()).setBitmapX(BitmapFactory.decodeByteArray((byte[]) args[0], 0, ((byte[])args[0]).length));
I am grateful for any suggestion, thank you in advance.
