如何解决尝试在后台Android 10中打开摄像头时获取异常摄像头“ 0”已被政策禁用”
该代码在低于10的Android版本中正常工作
我有一个计划由AlarmManager在特定时间运行的广播接收器。触发后,它会打开一个后台服务,该服务会使用Camera拍照。
如果MainActivity显示在屏幕上,则工作正常。如果我单击返回或该活动未运行,则会出现此异常
W/CameraBase: An error occurred while connecting to camera 0: Status(-8,EX_SERVICE_SPECIFIC): '6: connectHelper:1735: Camera "0" disabled by policy'
在此行
c = Camera.open();
也尝试从广播接收器显示通知并使服务作为前台服务启动,我也遇到同样的异常
代码段:
@Override
public int onStartCommand(Intent intent,int flags,int startId) {
// sv = new SurfaceView(getApplicationContext());
cameraIntent = intent;
pref = getApplicationContext().getSharedPreferences("MyPref",0);
editor = pref.edit();
windowManager = (WindowManager) getSystemService(WINDOW_SERVICE);
params = new WindowManager.LayoutParams(
WindowManager.LayoutParams.WRAP_CONTENT,WindowManager.LayoutParams.WRAP_CONTENT,WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY,WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,PixelFormat.TRANSLUCENT);
params.gravity = Gravity.TOP | Gravity.LEFT;
params.width = 1;
params.height = 1;
params.x = 0;
params.y = 0;
sv = new SurfaceView(getApplicationContext());
windowManager.addView(sv,params);
sHolder = sv.getHolder();
sHolder.addCallback(this);
// tells Android that this surface will have its data constantly
// replaced
if (Build.VERSION.SDK_INT < 11)
sHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
return START_STICKY;
}
public static Camera getCameraInstance() {
Camera c = null;
try {
c = Camera.open(); // attempt to get a Camera instance
} catch (Exception e) {
// Camera is not available (in use or does not exist)
e.printStackTrace();
}
return c; // returns null if camera is unavailable
}
@Override
public void onPictureTaken(byte[] data,Camera camera) {
try {
saveImage(data,System.currentTimeMillis() + "");
} catch (IOException e) {
e.printStackTrace();
}
if (mCamera != null) {
// decode the data obtained by the camera into a Bitmap
if (mCamera != null) {
mCamera.stopPreview();
mCamera.release();
mCamera = null;
}
/*
* Toast.makeText(getApplicationContext(),* "Your Picture has been taken !",Toast.LENGTH_LONG).show();
*/
Log.d("Camera","Image Taken !");
mCamera = null;
showToast("Your Picture has been taken !",Toast.LENGTH_SHORT);
stopSelf();
}
}
清单
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WAKE_LOCK"/>
<uses-permission android:name="android.permission.FOREGROUND_SERVICE"/>
接收器
public class MyReceiver extends BroadcastReceiver {
PowerManager pawerManager;
public static PowerManager.WakeLock wakeLock=null;
@RequiresApi(api = Build.VERSION_CODES.O)
@Override
public void onReceive(Context context,Intent intent) {
pawerManager = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
wakeLock = pawerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK,"CameraApp:CameraReceiver");
wakeLock.acquire();
Log.d("Receiver: ","CameraApp:CameraReceiver called");
Intent serviceIntent=new Intent(context,CameraService.class);
ContextCompat.startForegroundService(context,serviceIntent);
}
}
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