android - 模拟器在拍摄照片时崩溃(NullPointerException)

Question

我在拍摄照片时遇到了一些问题。

到目前为止，我可以毫无问题地从相机、模拟器和真实设备拍照。但是那些照片，是保存在默认路径上的。

我想编辑那条路线，所以我可以自己设置。

我是这样做的:

File folder = new File(Environment.getExternalStorageDirectory().toString()+"/ImagesFolder/");
            folder.mkdirs();

            Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
            Uri uriSavedImage=Uri.fromFile(new File(Environment.getExternalStorageDirectory().toString()+"/ImagesFolder/imatge.jpg"));
            cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, uriSavedImage);

            startActivityForResult(cameraIntent, 1888);

这是在真实设备 Sony Ericsson Xperia Ray 上运行的。它会创建文件夹，并将图像保存在那里。

但问题出在模拟器上。恐怕这会发生在其他设备上。

这是日志:

01-06 21:35:21.115: E/AndroidRuntime(1565): FATAL EXCEPTION: main
01-06 21:35:21.115: E/AndroidRuntime(1565): java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=264032, result=-1, data=null} to activity {com.exercise.AndroidViewPager/com.exercise.AndroidViewPager.AndroidViewPagerActivity}: java.lang.NullPointerException
01-06 21:35:21.115: E/AndroidRuntime(1565):     at android.app.ActivityThread.deliverResults(ActivityThread.java:3319)
01-06 21:35:21.115: E/AndroidRuntime(1565):     at android.app.ActivityThread.handleSendResult(ActivityThread.java:3362)
01-06 21:35:21.115: E/AndroidRuntime(1565):     at android.app.ActivityThread.access$1100(ActivityThread.java:141)
01-06 21:35:21.115: E/AndroidRuntime(1565):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1282)
01-06 21:35:21.115: E/AndroidRuntime(1565):     at android.os.Handler.dispatchMessage(Handler.java:99)
01-06 21:35:21.115: E/AndroidRuntime(1565):     at android.os.Looper.loop(Looper.java:137)
01-06 21:35:21.115: E/AndroidRuntime(1565):     at android.app.ActivityThread.main(ActivityThread.java:5039)
01-06 21:35:21.115: E/AndroidRuntime(1565):     at java.lang.reflect.Method.invokeNative(Native Method)
01-06 21:35:21.115: E/AndroidRuntime(1565):     at java.lang.reflect.Method.invoke(Method.java:511)
01-06 21:35:21.115: E/AndroidRuntime(1565):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
01-06 21:35:21.115: E/AndroidRuntime(1565):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
01-06 21:35:21.115: E/AndroidRuntime(1565):     at dalvik.system.NativeStart.main(Native Method)
01-06 21:35:21.115: E/AndroidRuntime(1565): Caused by: java.lang.NullPointerException
01-06 21:35:21.115: E/AndroidRuntime(1565):     at com.exercise.AndroidViewPager.MyFragmentD.onActivityResult(MyFragmentD.java:52)
01-06 21:35:21.115: E/AndroidRuntime(1565):     at android.support.v4.app.FragmentActivity.onActivityResult(FragmentActivity.java:152)
01-06 21:35:21.115: E/AndroidRuntime(1565):     at android.app.Activity.dispatchActivityResult(Activity.java:5293)
01-06 21:35:21.115: E/AndroidRuntime(1565):     at android.app.ActivityThread.deliverResults(ActivityThread.java:3315)
01-06 21:35:21.115: E/AndroidRuntime(1565):     ... 11 more

崩溃:

01-06 21:35:21.115: E/AndroidRuntime(1565): Caused by: java.lang.NullPointerException
01-06 21:35:21.115: E/AndroidRuntime(1565):     at com.exercise.AndroidViewPager.MyFragmentD.onActivityResult(MyFragmentD.java:52)

来自这里:

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    if( requestCode == 1888 && resultCode == -1) { //-1 = TOT HA ANAT BE.
        Bitmap photo = (Bitmap) data.getExtras().get("data");
        Log.d("debugging",""+photo.getHeight());
        Log.d("debugging",""+photo.getWidth());
        ((ImageView) myFragmentView.findViewById(R.id.fotoCapturada)).setImageBitmap(photo);
    }
}

完全正确:

Bitmap photo = (Bitmap) data.getExtras().get("data");

经过一些研究，我没有发现任何明确的...

你能帮我解决这个问题吗？

谢谢。

Answer 1

由于您的数据附加方法不起作用，您可以尝试在 Intent 启动时存储文件的字段或路径。

File resultingFile;//This will be in your class definition

File folder = new File(Environment.getExternalStorageDirectory().toString()+"/ImagesFolder/");
folder.mkdirs();

Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
resultingFile = new File(folder.toString() + "/image.jpg");
Uri uriSavedImage=Uri.fromFile(resultingFile);
cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, uriSavedImage);

startActivityForResult(cameraIntent, 1888);

因此，当您输入 onActivityResult 时，您可以针对 RESULT_OK 和 RESULT_CANCELED 测试 resultCode。当我使用 onActivityResult 时，我是这样做的:

if(requestCode == 1888){
  if(resultCode == RESULT_OK){ //Called when the user saves the image
     if(resultingFile.exists(){
       Bitmap photo = BitmapFactory.decodeFile(resultingFile.getPath()); 
       ((ImageView) myFragmentView.findViewById(R.id.fotoCapturada)).setImageBitmap(photo);
     }
  }else if(resultCode == RESULT_CANCELED){ //Called when the user presses back or cancels the saving of the image

  }
}