[android-developers] camera preview problem
Hi friends,
i have to take picture from my application and need to store it
database. i used following preview code in my app
class Preview extends SurfaceView implements SurfaceHolder.Callback
{ // 1
private static final String TAG = Preview;
SurfaceHolder mHolder; // 2
public Camera camera;
Size mPreviewSize;
ListSize mSupportedPreviewSizes;
Preview(Context context) {
super(context);
// Install a SurfaceHolder.Callback so we get notified when the
// underlying surface is created and destroyed.
mHolder = getHolder(); // 4
mHolder.addCallback(this); // 5
mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); // 6
}
// Called once the holder is ready
public void surfaceCreated(SurfaceHolder holder) { // 7
// The Surface has been created, acquire the camera and tell it
where
// to draw.
camera = Camera.open(); // 8
try {
camera.setPreviewDisplay(holder); // 9
camera.setPreviewCallback(new PreviewCallback() { // 10
// Called for each frame previewed
public void onPreviewFrame(byte[] data, Camera camera) { //
11
Log.d(TAG, onPreviewFrame called at: +
System.currentTimeMillis());
Preview.this.invalidate(); // 12
}
});
} catch (IOException e) { // 13
e.printStackTrace();
}
}
// Called when the holder is destroyed
public void surfaceDestroyed(SurfaceHolder holder) { // 14
Log.d(TAG,Stopping preview in SurfaceDestroyed().);
camera.setPreviewCallback(null);
camera.stopPreview();
camera.release();
// camera = null;
}
// Called when holder has changed
public void surfaceChanged(SurfaceHolder holder, int format, int w,
int h) { // 15
Camera.Parameters p = camera.getParameters();
p.setPreviewSize(w, h);
camera.setParameters(p);
camera.startPreview();
}
public void setCamera(Camera camera) {
camera = camera;
if (camera != null) {
mSupportedPreviewSizes =
camera.getParameters().getSupportedPreviewSizes();
requestLayout();
}
}
public void switchCamera(Camera camera) {
setCamera(camera);
try {
camera.setPreviewDisplay(mHolder);
} catch (IOException exception) {
Log.e(TAG, IOException caused by setPreviewDisplay(),
exception);
}
Camera.Parameters parameters = camera.getParameters();
parameters.setPreviewSize(mPreviewSize.width,
mPreviewSize.height);
requestLayout();
camera.setParameters(parameters);
}
}
the same code working well in samsung galaxy tab(model no GT-P1010).
but the camera preview is not clear in samsung galaxy Verizon (model
SCH-I800). The preview is very blurry, but the photo it takes is
good. what might be problem is it there any fault in my code? how to
solve this?
Thanks
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[android-developers] Re: Problem in Asynctask Execution in standby mode
Thanks Guys.. i solved this problem. the solution is we need to dismiss the progressDialog and set this to null in onPause method. And in onPostExecute method we have to check progressDialog!=null before dismiss this dialog... Thnak you for your response -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
[android-developers] Problem in Asynctask Execution in standby mode
Hi friends,
I am using AsyncTask concept to download data from
server.
private class DownloadTask extends AsyncTaskVoid,Void,String
{
private ProgressDialog progressDialog;
@Override
protected void onPreExecute()
{
super.onPreExecute();
progressDialog = new ProgressDialog(ActivityTab.this);
progressDialog.setProgress(10);
progressDialog.setSecondaryProgress(32);
progressDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
progressDialog.setMessage(Downloading...);
progressDialog.show();
}
protected String doInBackground(Void... params)
{
String result= ;
result = download();
return result;
}
protected void onPostExecute(String result)
{
if(progressDialog.isShowing())
progressDialog.dismiss();
Toast.makeText(getApplicationContext(),
+result.toString(),Toast.LENGTH_LONG).show();
}
}
in download button click i called
new DownloadTask().execute();
This is working well. the thing is if device goes to standby mode
(Screen goes off) while showing this downloading.. progressbar mean my
application getting force closed. it says like IllegalStateException.
how to solve this probelm? it is there any way to prevent screen from
locking untill complete this download process? please help me.
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