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I am developing a camera application using latest Camera 2 API, and I have a button in my app to choose front facing camera and back facing camera on each button click.

Code for that is:

switch_camera.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        // facing = characteristics.get(CameraCharacteristics.LENS_FACING);
        if (facing != null && facing == CameraCharacteristics.LENS_FACING_FRONT) {
            //isfrontcam=true;
            try {
                manager.openCamera("0",mStateCallback,mBackgroundHandler);
            } catch (SecurityException e) {
                e.printStackTrace();
            } catch (CameraAccessException e) {
                e.printStackTrace();
            }
        } else if (facing != null && facing == CameraCharacteristics.LENS_FACING_BACK) {
            // isfrontcam = true;
            try {
                manager.openCamera("1", mStateCallback, mBackgroundHandler);
            } catch (SecurityException e) {
                e.printStackTrace();
            } catch (CameraAccessException e) {
                e.printStackTrace();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}

My problem is app will minimizing automatically when I click the button to select camera.The above snippet is executing on button click. I could not understand the reason for this bug. Can anyone help?

4

1 回答 1

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需要 logcat 信息来了解您的实际问题，在没有太多信息的情况下，我猜下面的解决方案可能对您有用。

而不是 --> manager.openCamera("0",mStateCallback,mBackgroundHandler); & manager.openCamera("1", mStateCallback, mBackgroundHandler);

试试：manager.openCamera(getBackFacingCameraId(cManager), mStateCallback,mBackgroundHandler);

manager.openCamera(getFrontFacingCameraId(cManager),mStateCallback, mBackgroundHandler);

String getFrontFacingCameraId(CameraManager cManager){
   for(final String cameraId : cManager.getCameraIdList()){
         CameraCharacteristics characteristics =     
         cManager.getCameraCharacteristics(cameraId);
         int cOrientation =        
         characteristics.get(CameraCharacteristics.LENS_FACING);
         if(cOrientation == CameraCharacteristics.LENS_FACING_FRONT)      
             return cameraId;
         }
         return null;
}


String getBackFacingCameraId(CameraManager cManager){
     for(final String cameraId : cManager.getCameraIdList()){
         CameraCharacteristics characteristics =      
         cManager.getCameraCharacteristics(cameraId);
         int cOrientation =   
         characteristics.get(CameraCharacteristics.LENS_FACING);
         if(cOrientation == CameraCharacteristics.LENS_FACING_BACK)   
            return cameraId;
         }
         return null;
}

参考：https ://android.googlesource.com/platform/packages/apps/Camera2/+/f5e51ec44934d6d687267d2aff6386f5b728dd9f/src/com/android/camera/one/v2/OneCameraManagerImpl.java

于 2016-02-12T11:57:44.247 回答