在套件中獲取null對象引用getExtras（）方法

Question

我正在創建一個應用程序，它從相機捕獲圖像並將圖像保存在文件中。在onActivityResult（）方法我收到空對象引用錯誤。 我的片段類是在這裏：

public class HomeFragment extends Fragment { 
private static final int REQUEST_IMAGE_CAPTURE = 1; 
private static final String JPEG_FILE_PREFIX = "IBR_"; 
private static final String JPEG_FILE_SUFFIX = ".jpg"; 
File photoFile = null; 
ImageButton camera_button; 

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
         Bundle savedInstanceState) { 

    View rootView = inflater.inflate(R.layout.fragment_home, container, false); 
    camera_button = (ImageButton) rootView.findViewById(R.id.camera); 
    camera_button.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 
      Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE); 
      // Ensure that there's a camera activity to handle the intent 
      if (cameraIntent.resolveActivity(getActivity().getPackageManager()) != null) { 
       // Create the File where the photo should go 
       try { 
        photoFile = createImageFile(); 
       } catch (IOException ex) { 
        // Error occurred while creating the File 
        Log.i("File error", "File"); 
       } 
      } 
      // Continue only if the File was successfully created 
      if (photoFile != null) { 
       Uri fileUri = Uri.fromFile(photoFile); 
       cameraIntent.putExtra(android.provider.MediaStore.EXTRA_OUTPUT, 
         fileUri); 
       Toast.makeText(getActivity(), photoFile.toString(), Toast.LENGTH_SHORT).show(); 
       startActivityForResult(cameraIntent, REQUEST_IMAGE_CAPTURE); 
      } 
     } 
    }); 

    return rootView; 
} 

@Override 
public void onActivityResult(int requestCode, int resultCode, Intent data) { 
    if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == Activity.RESULT_OK) { 
     Bundle extras = data.getExtras(); 
     Bitmap imageBitmap = (Bitmap) extras.get("data"); 
     camera_button.setImageBitmap(imageBitmap); 
    } 

} 

private File createImageFile() throws IOException { 
    // Create an image file name 
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date()); 
    String imageFileName = JPEG_FILE_PREFIX + timeStamp + "_"; 
    File storageDir = Environment.getExternalStoragePublicDirectory(
      Environment.DIRECTORY_PICTURES); 
    File imageF = File.createTempFile(imageFileName, JPEG_FILE_SUFFIX, storageDir); 
    return imageF; 
} 

}

其實我得到的錯誤在這行捆綁額外= data.getExtras（）; 任何建議如何解決這個問題？

Answer 1

如果您指定MediaStore.EXTRA_OUTPUT，那麼在intent extra-in activityOnResult中不會返回拇指按鈕 - 您必須手動讀取作爲MediaStore.EXTRA_OUTPUT提供的文件路徑。

可以在文檔的閱讀ACTION_IMAGE_CAPTURE：

調用者可以通過一個額外的EXTRA_OUTPUT爲了控制這個圖像將被寫入。 *如果EXTRA_OUTPUT不存在，則在額外字段中將小圖像作爲位圖對象返回。