意图进行拍照，如果我按回，应用程序崩溃

Question

我调用这个函数：

private void TakePhoto() { 
    LogService.log(TAG, "inTakePicture"); 
    Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); 
    file = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + "/BlueSkyBio/media/", "test.jpg"); 

    outputFileUri = Uri.fromFile(file); 
    intent.putExtra(MediaStore.EXTRA_OUTPUT, outputFileUri); 
    startActivityForResult(intent, TAKE_PICTURE); 

} 

这需要我的下一个onActivityResult：

public void onActivityResult(int requestCode, int resultCode, Intent data) { 
    if (requestCode == TAKE_PICTURE) { 
     if(outputFileUri != null){ 
      LogService.log("MainFragment", outputFileUri.toString()); 
      String path = outputFileUri.toString(); 
      selectedVideoPath = path.substring(7); 
      LogService.log("in take pic", "selectedImagePath: " + selectedVideoPath); 
      Intent paintActivity = new Intent(getActivity(), PaintActivity.class); 
      paintActivity.putExtra("selectedImagePath", selectedVideoPath); 
      paintActivity.putExtra("isVideo", false); 
      startActivity(paintActivity); 
      ((FragmentActivity) getActivity()).finish(); 
     } else{ 
      //    Toast.makeText(getActivity(), "No picture taken", Toast.LENGTH_SHORT).show(); 
      Intent main = new Intent(getActivity(), FragmentActivity.class); 
      startActivity(main); 
      ((FragmentActivity) getActivity()).finish(); 
     } 


    } 

} 

该工程确定，但如果我调用意图拍照，然后按后退按钮，如果我以前已经拍过照片，它会加载该照片，如果没有，它会崩溃，因为按回来，它不会拍照。我能做些什么来摆脱这种情况？

我试图测试：

if(data != null) // instead of: if(outputFileUri != null){ 

但是，这绝不会输入代码的“其他”的一部分。

Answer 1

使用这些条件：

private static final int CAMERA_PIC_REQUEST = 1337; 

@Override 
protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
    super.onActivityResult(requestCode, resultCode, data); 

    if(requestCode==CAMERA_PIC_REQUEST && resultCode == RESULT_OK){ 

     log.d("something","something");   
    } 
    else if (resultCode == Activity.RESULT_CANCELED) 
    { 
     log.d("something","something"); 
    } 

}