There seems to be a problem on my Nexus 5 with KRT16M when taking a frame
from the camera using android.hardware.Camera setOneShotPreviewCallback.
The camera preview goes dark and the frame saved is always dark. After
the call happens the preview stays dark. This is a real problem since the
saved frames are so dark they're pretty useless. The code below
demonstrates the problem and runs fine on every other device I've tried.
It seems like a legitimate problem. Unless anyone has an answer I'm going
to file a bug soon.
public class MainActivity extends Activity implements
SurfaceTextureListener {
private Camera mCamera;
private TextureView mTextureView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mTextureView = new TextureView(this);
mTextureView.setSurfaceTextureListener(this);
setContentView(mTextureView);
}
@Override
public void onSurfaceTextureAvailable(SurfaceTexture surface, int width,
int height) {
mCamera = Camera.open();
Camera.Size previewSize = mCamera.getParameters().getPreviewSize();
mTextureView.setLayoutParams(new FrameLayout.LayoutParams(
previewSize.width, previewSize.height, Gravity.CENTER));
try {
mCamera.setPreviewTexture(surface);
} catch (IOException t) {
}
mCamera.startPreview();
Handler handler = new Handler();
handler.postDelayed(new Runnable() {
@Override
public void run() {
mCamera.setOneShotPreviewCallback(new PreviewCallback() {
@Override
public void onPreviewFrame(byte[] data, Camera camera) {
}
});
}
}, 5000);
handler.postDelayed(new Runnable() {
@Override
public void run() {
mCamera.stopPreview();
}
}, 10000);
handler.postDelayed(new Runnable() {
@Override
public void run() {
mCamera.startPreview();
}
}, 15000);
}
@Override
public void onSurfaceTextureSizeChanged(SurfaceTexture surface, int width,
int height) {
}
@Override
public boolean onSurfaceTextureDestroyed(SurfaceTexture surface) {
mCamera.stopPreview();
mCamera.release();
return true;
}
@Override
public void onSurfaceTextureUpdated(SurfaceTexture surface) {
}
}
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