安卓拍照时，用户无法密码

我有一个DeviceAdminReceiver，我想，当用户没有密码采取与前置摄像头的图片 - 但我得到了一个错误......安卓拍照时，用户无法密码

代码：

@Override 
    public void onPasswordFailed(Context context, Intent intent) { 
     try { 
      takePictureNoPreview(context); 
     } catch (IOException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } 
    } 

public void takePictureNoPreview(Context context) throws IOException { 
     // open back facing camera by default 
     Camera myCamera = Camera.open(); 

     if (myCamera != null) { 
      try { 
       // set camera parameters if you want to 
       // ... 

       // here, the unused surface view and holder 
       SurfaceView dummy = new SurfaceView(context); 
       myCamera.setPreviewDisplay(dummy.getHolder()); 
       myCamera.startPreview(); 
       myCamera.takePicture(null, null, getJpegCallback()); //ERROR HERE, LINE 85 

      } finally { 
       // myCamera.close(); 

      } 

     } else { 
      // booo, failed! 
     } 
    } 

    private PictureCallback getJpegCallback() { 
     PictureCallback jpeg = new PictureCallback() { 
      @Override 
      public void onPictureTaken(byte[] data, Camera camera) { 
       FileOutputStream fos; 
       try { 
        fos = new FileOutputStream("test.jpeg"); 
        fos.write(data); 
        fos.close(); 
       } catch (IOException e) { 
        // do something about it 
       } 
      } 
     }; 
     return jpeg; 

    }

错误日志：

03-20 08:01:35.427: E/AndroidRuntime(26930): FATAL EXCEPTION: main 
03-20 08:01:35.427: E/AndroidRuntime(26930): java.lang.RuntimeException: Unable to start receiver packagename.receivername: java.lang.RuntimeException: takePicture failed 
03-20 08:01:35.427: E/AndroidRuntime(26930): at android.app.ActivityThread.handleReceiver(ActivityThread.java:2383) 
03-20 08:01:35.427: E/AndroidRuntime(26930): at android.app.ActivityThread.access$1500(ActivityThread.java:141) 
03-20 08:01:35.427: E/AndroidRuntime(26930): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1310) 
03-20 08:01:35.427: E/AndroidRuntime(26930): at android.os.Handler.dispatchMessage(Handler.java:99) 
03-20 08:01:35.427: E/AndroidRuntime(26930): at android.os.Looper.loop(Looper.java:137) 
03-20 08:01:35.427: E/AndroidRuntime(26930): at android.app.ActivityThread.main(ActivityThread.java:5041) 
03-20 08:01:35.427: E/AndroidRuntime(26930): at java.lang.reflect.Method.invokeNative(Native Method) 
03-20 08:01:35.427: E/AndroidRuntime(26930): at java.lang.reflect.Method.invoke(Method.java:511) 
03-20 08:01:35.427: E/AndroidRuntime(26930): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 
03-20 08:01:35.427: E/AndroidRuntime(26930): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 
03-20 08:01:35.427: E/AndroidRuntime(26930): at dalvik.system.NativeStart.main(Native Method) 
03-20 08:01:35.427: E/AndroidRuntime(26930): Caused by: java.lang.RuntimeException: takePicture failed 
03-20 08:01:35.427: E/AndroidRuntime(26930): at android.hardware.Camera.native_takePicture(Native Method) 
03-20 08:01:35.427: E/AndroidRuntime(26930): at android.hardware.Camera.takePicture(Camera.java:1095) 
03-20 08:01:35.427: E/AndroidRuntime(26930): at android.hardware.Camera.takePicture(Camera.java:1040) 
03-20 08:01:35.427: E/AndroidRuntime(26930): at packagename.receivername.takePictureNoPreview(DeviceAdmin.java:85) 
03-20 08:01:35.427: E/AndroidRuntime(26930): at packagename.receivername.onPasswordFailed(DeviceAdmin.java:49) 
03-20 08:01:35.427: E/AndroidRuntime(26930): at android.app.admin.DeviceAdminReceiver.onReceive(DeviceAdminReceiver.java:305) 
03-20 08:01:35.427: E/AndroidRuntime(26930): at android.app.ActivityThread.handleReceiver(ActivityThread.java:2376) 
03-20 08:01:35.427: E/AndroidRuntime(26930): ... 10 more

可能是什么问题呢？在此先感谢！

来源

2013-03-20 keybee

此链接可以帮助你。 http://stackoverflow.com/questions/6535652/takepicture-hangs-on-android-2-3-3 – 2013-03-21 10:15:38

takePicture是失败，因为必须有更高版本的Android 4.0（至少1×1像素）使用过面视图

来源

2013-04-16 11:41:42 keybee

安卓拍照时，用户无法密码

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