Почему onResume (), кажется, вызывается дважды?
У меня есть свой класс деятельности здесь:
public class CameraActivity extends Activity {
private Camera mCamera;
private CameraPreview mPreview;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// startCamera();
}
public void startCamera() {
setContentView(R.layout.camera_view);
mCamera = getCameraInstance();// Open Camera
mPreview = new CameraPreview(this,mCamera);// Goto Another Class
FrameLayout preview = (FrameLayout) findViewById(R.id.camera_preview);
preview.setLayoutParams(new FrameLayout.LayoutParams(400,400));
//Declare Frame in which camera will be opened
preview.addView(mPreview); // show this class into frame
}
protected void onResume() {
super.onResume();
Log.d("Print","resume()");
startCamera();
}
public static Camera getCameraInstance() {
Camera c = null;
try {
c = Camera.open(); // attempt to get a Camera instance
} catch (Exception e) {
Toast.makeText(null,"No camera on this device",Toast.LENGTH_LONG).show();
// Camera is not available (in use or does not exist)
}
return c; // returns null if camera is unavailable
}
/*
protected void onPause() {
if (mCamera!=null) {
mCamera.release(); // release the camera for other applications
mCamera = null;
}
super.onPause();
}
*/
}
И класс Camera Preview здесь:
public class CameraPreview extends SurfaceView implements SurfaceHolder.Callback {
private SurfaceHolder mHolder;
private Camera mCamera;
@SuppressWarnings("deprecation")
public CameraPreview(Context context, Camera camera) {
super(context);
mCamera = camera;
mHolder = getHolder();
mHolder.addCallback(this);
mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
public void surfaceCreated(SurfaceHolder holder) {
try {
mCamera.setPreviewDisplay(holder);
mCamera.startPreview();
} catch (IOException e) {
Log.d("Print","Error setting camera preview: "+e.getMessage());
}
}
public void surfaceDestroyed(SurfaceHolder holder) {
Log.d("Print","Destroyed()");
mCamera.stopPreview();
mCamera.release();
// empty. Take care of releasing the Camera preview in your activity.
}
public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
if (mHolder.getSurface()==null) {
return;
}
try {
mCamera.stopPreview();
} catch (Exception e) {
// ignore: tried to stop a non-existent preview
}
try {
mCamera.setPreviewDisplay(mHolder);
mCamera.startPreview();
} catch (Exception e) {
Log.d("Print","Error starting camera preview: "+e.getMessage());
}
}
}
Однако когда я тестирую класс, onResume (), кажется, вызывается сначала, а затем снова через 1 или 2 секунды. Таким образом, камера должна обновить еще раз. Если я неФункция onResume () вообще не отображается, предварительный просмотр камеры стабилен, но затем происходит сбой, если я снова переключаюсь на приложение с домашнего экрана или другого приложения. Я'мы обнаружили, что onPause () не влияет ни на один из них. Мой код правильный? Что я должен добавить / удалить, чтобы он не обновлялся снова и не падал после переключения приложения?
Это выход LogCat из 1-го onResume () в другой:
12-19 22:58:27.604: D/Print(28831): resume()
12-19 22:58:27.624: D/dalvikvm(29223): GC_CONCURRENT freed 195K, 8% free 3591K/3864K, paused 2ms+1ms, total 9ms
12-19 22:58:27.634: D/dalvikvm(29223): GC_FOR_ALLOC freed 245K, 10% free 3667K/4068K, paused 6ms, total 7ms
12-19 22:58:27.644: D/dalvikvm(29223): GC_FOR_ALLOC freed 241K, 11% free 3742K/4164K, paused 6ms, total 7ms
12-19 22:58:27.649: I/AwesomePlayer(13841): setDataSource_l(URL suppressed)
12-19 22:58:27.659: I/AwesomePlayer(13841): setDataSource_l(URL suppressed)
12-19 22:58:27.674: D/dalvikvm(29223): GC_CONCURRENT freed 255K, 8% free 3908K/4240K, paused 1ms+0ms, total 9ms
12-19 22:58:27.674: I/Camera2ClientBase(13841): Camera 0: Opened
12-19 22:58:27.674: D/ExynosCameraHAL2(13841): >>> I'm Samsung's CameraHAL_2(ID:0) < 12-19 22:58:27.674: D/ExynosCameraHAL2(13841): g_cam2_device : 0x00000000
12-19 22:58:27.674: D/ExynosCameraHAL2(13841): (ExynosCameraHWInterface2): ENTER
12-19 22:58:27.789: D/dalvikvm(29223): GC_CONCURRENT freed 210K, 6% free 4151K/4416K, paused 2ms+7ms, total 50ms
12-19 22:58:27.854: D/dalvikvm(29223): GC_CONCURRENT freed 281K, 8% free 4336K/4676K, paused 1ms+1ms, total 11ms
12-19 22:58:27.879: D/ExynosCameraHAL2(13841): (ExynosCameraHWInterface2): EXIT
12-19 22:58:27.904: D/gamook(29223): Loaded 66 configuration entries.
12-19 22:58:27.914: D/dalvikvm(29223): GC_CONCURRENT freed 399K, 10% free 4447K/4908K, paused 1ms+4ms, total 27ms
12-19 22:58:27.914: D/dalvikvm(29223): WAIT_FOR_CONCURRENT_GC blocked 1ms
12-19 22:58:27.934: D/mali_winsys(28831): new_window_surface returns 0x3000
12-19 22:58:27.964: D/ExynosCameraHAL2(13841): (allocateStream): stream width(1920) height(1080) format(22)
12-19 22:58:27.969: D/ExynosCameraHAL2(13841): (registerStreamBuffers): stream_id(0), num_buff(8), handle(b8683a48)
12-19 22:58:27.974: D/ExynosCameraHAL2(13841): (allocateStream): stream width(2560) height(1920) format(21)
12-19 22:58:28.009: D/dalvikvm(29223): GC_CONCURRENT freed 279K, 8% free 4608K/4988K, paused 2ms+2ms, total 22ms
12-19 22:58:28.039: D/ExynosCameraHAL2(13841): (registerStreamBuffers): stream_id(4), num_buff(6), handle(b85aabd8)
12-19 22:58:28.039: D/ExynosCameraHAL2(13841): (allocateStream): stream width(2560) height(1920) format(ffffffff)
12-19 22:58:28.039: D/ExynosCameraHAL2(13841): (allocateStream): jpeg stream exists
12-19 22:58:28.039: D/ExynosCameraHAL2(13841): START stream thread 1 release 1869
12-19 22:58:28.049: D/ExynosCameraHAL2(13841): END stream thread 1 release 1874
12-19 22:58:28.064: D/dalvikvm(29223): GC_CONCURRENT freed 320K, 8% free 4694K/5076K, paused 3ms+2ms, total 18ms
12-19 22:58:28.139: D/dalvikvm(29223): GC_CONCURRENT freed 452K, 10% free 4697K/5212K, paused 3ms+2ms, total 30ms
12-19 22:58:28.184: D/ExynosCameraHAL2(13841): (registerStreamBuffers): stream_id(5), num_buff(11), handle(b855dc30)
12-19 22:58:28.199: D/dalvikvm(29223): GC_CONCURRENT freed 433K, 10% free 4775K/5268K, paused 2ms+2ms, total 29ms
12-19 22:58:28.199: D/ExynosCameraHAL2(13841): (allocateReprocessStreamFromStream): output_stream_id(5)
12-19 22:58:28.249: D/dalvikvm(29223): GC_CONCURRENT freed 513K, 11% free 4828K/5400K, paused 1ms+1ms, total 16ms
12-19 22:58:28.249: D/dalvikvm(29223): WAIT_FOR_CONCURRENT_GC blocked 5ms
12-19 22:58:28.294: D/dalvikvm(29223): GC_CONCURRENT freed 528K, 11% free 4884K/5472K, paused 2ms+0ms, total 17ms
12-19 22:58:28.294: D/dalvikvm(29223): WAIT_FOR_CONCURRENT_GC blocked 3ms
12-19 22:58:28.344: D/dalvikvm(29223): GC_CONCURRENT freed 601K, 12% free 4888K/5548K, paused 2ms+1ms, total 19ms
12-19 22:58:28.344: D/dalvikvm(29223): WAIT_FOR_CONCURRENT_GC blocked 7ms
12-19 22:58:28.389: D/dalvikvm(29223): GC_CONCURRENT freed 616K, 13% free 4857K/5548K, paused 0ms+1ms, total 17ms
12-19 22:58:28.399: D/ExynosCameraHAL2(13841): ### Applying AF Mode change(Mode 2)
12-19 22:58:28.404: D/dalvikvm(29223): GC_FOR_ALLOC freed 17K, 13% free 4843K/5548K, paused 14ms, total 14ms
12-19 22:58:28.404: I/dalvikvm-heap(29223): Grow heap (frag case) to 4.823MB for 39033-byte allocation
12-19 22:58:28.419: D/dalvikvm(29223): GC_FOR_ALLOC freed