Hi,
I have basically 2 Activitys. The first Activity calls second Activity
by startActivityForResult() with an int > 0 as requestCode. Second
Activity handles my Camera picking preview pictures with
setOneShotPreviewCallback().
if I have the desired picture, I but data into an Bundle, put this
bundle as extras into an Intent and call
setResult(RESULT_FIRST_USER, extraIntent);
finish();
but onActivityResult never gets triggered.
I put interesting Code below:
public class MainActivity extends Activity {
Button mButtonScan;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mButtonScan = (Button)findViewById(R.id.main_btn_scan);
}
/**
* OnClick Event called from main.xml
* @param v View that called that onClickEvent
*/
public void btnCaptureClick(View v){
Intent intent = new Intent(this, CaptureActivity.class);
startActivityForResult(intent, Constants.REQUEST_CODE_CAPTURE);
}
/**
* callback for this Activity. Called when an Activity which was
started by
* this.startActivityForResult(intent, requestCode) sets its result
and calls finish()
*/
@Override
protected void onActivityResult(int requestCode, int resultCode,
Intent data) {
String foo = "foo";
switch (requestCode) {
case Constants.REQUEST_CODE_CAPTURE:
switch (resultCode) {
case RESULT_FIRST_USER:
Toast.makeText(this,
data.getStringExtra(Config.SCAN_RESULT_TEXT),
Toast.LENGTH_LONG).show();
break;
case RESULT_CANCELED:
break;
default:
break;
}
break;
default:
super.onActivityResult(requestCode, resultCode, data);
break;
}
}
}
public class CaptureActivity extends Activity
implements ActivityCallback , SurfaceHolder.Callback, PreviewCallback{
private Preview mPreview;
private Camera mCam;
private SurfaceHolder mHolder;
private Size size;
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.capture);
mPreview = (Preview)findViewById(R.id.capture_preview);
}
@Override
public void onValidDecodeResult(Result rawResult, Bitmap barcode) {
Intent intent = new Intent();
if (rawResult != null && barcode != null){
intent.putExtra(Config.SCAN_RESULT_TEXT, rawResult.getText());
intent.putExtra(Config.SCAN_RESULT_FORMAT,
rawResult.getBarcodeFormat().getName());
intent.putExtra(Config.SCAN_RESULT_BMP, barcode);
} else {
intent.putExtra(Config.SCAN_RESULT_TEXT, "foo");
intent.putExtra(Config.SCAN_RESULT_FORMAT, "bar");
intent.putExtra(Config.SCAN_RESULT_BMP, "barcode");
}
mPreview = null;
setResult(Activity.RESULT_FIRST_USER, intent);
finish();
}
@Override
public void onPreviewFrame(byte[] data, Camera camera) {
MultiFormatReader reader = new MultiFormatReader();
PlanarYUVLuminanceSource source = new
PlanarYUVLuminanceSource(data, size.width, size.height, 160, 60, 480,
360);
GlobalHistogramBinarizer binarizer = new
GlobalHistogramBinarizer(source);
BinaryBitmap bb = new BinaryBitmap(binarizer);
Result result = null;
try {
result = reader.decode(bb);
}catch (NotFoundException e) {
//do NOTHING cause e == null
}catch (Exception e){
e.printStackTrace();
} finally {
reader.reset();
}
if (result != null){
mCam.stopPreview();
releaseCameraResources();
onValidDecodeResult(result,
source.renderCroppedGreyscaleBitmap());
} else {
camera.setOneShotPreviewCallback(this);
}
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
try {
mCam = Camera.open();
mCam.setPreviewDisplay(mPreview.getHolder());
} catch (IOException e) {
releaseCameraResources();
e.printStackTrace();
}
}
private void releaseCameraResources(){
mCam.release();
mCam = null;
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int
width,
int height) {
//begin Preview
Camera.Parameters parameters = mCam.getParameters();
List<Size> sizes = parameters.getSupportedPreviewSizes();
size = getOptimalPreviewSize(sizes, width, height);
parameters.setPreviewSize(size.width, size.height);
mCam.setParameters(parameters);
mCam.startPreview();
mCam.setOneShotPreviewCallback(this);
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
if (mCam != null){
mCam.stopPreview();
releaseCameraResources();
}
}
}
the class Preview extends SurfaceView...
If someone of You needs additional Information I'll try to give it.
so far I can say that I put breakpoints to setResult() and finish() to
ensure that they get called. They get called.
onActivityResult() is called if I setResult() in onCreate() of
CaptureActivity and call finish() that early. If I debug deep into
Android source I found out that onActivityResult is called by a
Message with msg.what == 108 (I think to remember) internally. This
Message is never send in the code above and I could't find out, who os
responsible for firing this message. They appear 'magically' in the
Handler in queue.next. Maybe I can 'hack' myself into Android system
and fire this Message myself.
Any other ideas, workarounds, opinions are welcome
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