[英]Taking picture in service with/without SurfaceView (android)
我正在開發android應用(我在大學的學期工作)-所以我終於把書堆起來-我在編程方面非常糟糕(剛剛開始)。 我知道,此問題已在此處解決,而無需預覽即可從相機拍照,而此處的后台服務可使用Camera拍照 。 但這兩者都沒有對我有所幫助(是的,我很假)。 因此,目前我只有這個Main類:
public class MainActivity extends Activity {
public static SurfaceView surfaceView;
public static SurfaceHolder surfaceHolder;
public static Camera camera;
final String LOG_TAG = "myLogs";
@Override
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
Log.d(LOG_TAG, "onCreateMain");
setContentView(R.layout.main);
surfaceView = (SurfaceView) findViewById(R.id.surface);
surfaceHolder = surfaceView.getHolder();
surfaceHolder.addCallback(new SurfaceHolder.Callback() {
@Override
public void surfaceCreated(SurfaceHolder holder) {
try {
camera.setPreviewDisplay(holder);
camera.startPreview();
} catch (Exception e) {
e.printStackTrace();
}
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format,
int width, int height) {
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
}
});
}
public void Start(View view){
startService(new Intent(this, MyService.class));
Log.d(LOG_TAG, "onStartMain");
finish();
}
public void Stop(View view){
stopService(new Intent(this, MyService.class));}
}
這是服務類:
public class MyService extends Service {
private Camera camera = MainActivity.camera;
private SurfaceView surfaceView = MainActivity.surfaceView;
private SurfaceHolder surfaceHolder = MainActivity.surfaceHolder;
File photoFile;
final String LOG_TAG = "myLogs";
@Override
public void onCreate(){
super.onCreate();
Log.d(LOG_TAG, "onCreate");
File pictures = Environment
.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
photoFile = new File(pictures, "myphoto.jpg");
}
@Override
public int onStartCommand(Intent intent,int flags, int startId){
Log.d(LOG_TAG, "onStartCommand");
camera = Camera.open();
takePicture();
return super.onStartCommand(intent, flags, startId);
}
private void takePicture() {
Log.d(LOG_TAG, "onTakePicture");
camera.takePicture(null, null, new Camera.PictureCallback() {
@Override
public void onPictureTaken(byte[] data, Camera camera) {
try {
FileOutputStream fos = new FileOutputStream(photoFile);
fos.write(data);
fos.close();
Log.d(LOG_TAG, "PictureTaken");
} catch (Exception e) {
Log.d(LOG_TAG,"Exception");
e.printStackTrace();
}
}
});
}
@Override
public void onDestroy(){
Log.d(LOG_TAG, "onDestroy");
releaseCamera();
super.onDestroy();
}
private void releaseCamera() {
if (camera != null)
camera.release();
camera = null;
}
@Override
public IBinder onBind(Intent intent) {
return null;}
}
程序在日志記錄后堆棧
Log.d(LOG_TAG,“ onTakePicture”);
如果我停止服務-一切正常(調用onDestroy())。 問題僅在於它不拍照或不保存。 沒有日志消息
Log.d(LOG_TAG,“ PictureTaken”);
那么,有人可以幫助我解決這個問題嗎?
我沒有運行您的代碼,但是我認為您應該刪除MainActivity.Start()
中的finish()
調用,因為這會強制關閉應用程序。 圖片不會立即拍攝,您必須等待Service類中對onPictureTaken()
的回調調用。
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