java.lang.RuntimeException：捕獲圖像時發送resultInfo結果失敗

Question

我正在研究一個應用程序，該應用程序允許拍照並將其保存到SD卡上的目錄中。它工作正常的大部分設備，但我發現在極少數的設備，這個錯誤：

08-26 15:29:11.712 11925 11925 E AndroidRuntime: FATAL EXCEPTION: main 
08-26 15:29:11.712 11925 11925 E AndroidRuntime: java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=0, result=-1, data=Intent { act=inline-data dat=file:///storage/emulated/0/.MyImgs/IMG_20132926032905.jpg typ=image/jpeg (has extras) }} to activity {com.example.myApp/com.example.myApp.Com}: java.lang.NullPointerException 
08-26 15:29:11.712 11925 11925 E AndroidRuntime: at android.app.ActivityThread.deliverResults(ActivityThread.java:3403) 
08-26 15:29:11.712 11925 11925 E AndroidRuntime: at android.app.ActivityThread.handleSendResult(ActivityThread.java:3446) 
08-26 15:29:11.712 11925 11925 E AndroidRuntime: at android.app.ActivityThread.access$1100(ActivityThread.java:150) 
08-26 15:29:11.712 11925 11925 E AndroidRuntime: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1324) 
08-26 15:29:11.712 11925 11925 E AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:99) 
08-26 15:29:11.712 11925 11925 E AndroidRuntime: at android.os.Looper.loop(Looper.java:213) 
08-26 15:29:11.712 11925 11925 E AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:5153) 
08-26 15:29:11.712 11925 11925 E AndroidRuntime: at java.lang.reflect.Method.invokeNative(Native Method) 
08-26 15:29:11.712 11925 11925 E AndroidRuntime: at java.lang.reflect.Method.invoke(Method.java:511) 
08-26 15:29:11.712 11925 11925 E AndroidRuntime: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 
08-26 15:29:11.712 11925 11925 E AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 
08-26 15:29:11.712 11925 11925 E AndroidRuntime: at dalvik.system.NativeStart.main(Native Method) 
08-26 15:29:11.712 11925 11925 E AndroidRuntime: Caused by: java.lang.NullPointerException 
08-26 15:29:11.712 11925 11925 E AndroidRuntime: at android.os.Parcel.readException(Parcel.java:1445) 
08-26 15:29:11.712 11925 11925 E AndroidRuntime: at android.os.Parcel.readException(Parcel.java:1389) 
08-26 15:29:11.712 11925 11925 E AndroidRuntime: at android.content.IContentService$Stub$Proxy.notifyChange(IContentService.java:472) 
08-26 15:29:11.712 11925 11925 E AndroidRuntime: at android.content.ContentResolver.notifyChange(ContentResolver.java:1297) 
08-26 15:29:11.712 11925 11925 E AndroidRuntime: at android.content.ContentResolver.notifyChange(ContentResolver.java:1286) 
08-26 15:29:11.712 11925 11925 E AndroidRuntime: at android.content.ContentResolver.notifyChange(ContentResolver.java:1266) 
-->08-26 15:29:11.712 11925 11925 E AndroidRuntime:  at com.example.myApp.Com.onActivityResult(Com.java:265)<-- 
08-26 15:29:11.712 11925 11925 E AndroidRuntime: at android.app.Activity.dispatchActivityResult(Activity.java:5293) 
08-26 15:29:11.712 11925 11925 E AndroidRuntime: at android.app.ActivityThread.deliverResults(ActivityThread.java:3399) 
08-26 15:29:11.712 11925 11925 E AndroidRuntime: ... 11 more 

以下是我創造我的文件夾，保存圖像並啓動相機

String root = Environment.getExternalStorageDirectory()+"/.MyImgs/"; 
File newDirectory = new File(root); 
//create directory if it doesn't exist 
if(!newDirectory.exists()) 
    newDirectory.mkdirs(); 

//create and name the image 
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyymmddhhmmss"); 
String date = dateFormat.format(new Date()); 
File f = new File(newDirectory,"IMG_"+date+".jpg"); 

//save image directory 
mUri = Uri.fromFile(f); 
// Result of activity: TAKE_PICTURE 
startActivityForResult(i, TAKE_PICTURE); 

這裏的部分發生錯誤的地方：

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

    if (resultCode == Activity.RESULT_OK) { 
     getContentResolver().notifyChange(mUri, null);//line 265 
    } 
} 

任何人都可以幫我找到有什麼問題嗎？爲什麼它在某些設備上工作，而不是在其他設備上工作？謝謝。

Answer 1

試試這個，它的工作般的魅力對我來說：

private String selectedImagePath = ""; 
final private int PICK_IMAGE = 1; 
final private int CAPTURE_IMAGE = 2; 

public Uri setImageUri() { 
    // Store image in dcim 
    File file = new File(Environment.getExternalStorageDirectory() + "/DCIM/", "image" + new Date().getTime() + ".png"); 
    Uri imgUri = Uri.fromFile(file); 
    this.imgPath = file.getAbsolutePath(); 
    return imgUri; 
} 


public String getImagePath() { 
    return imgPath; 
} 

btnGallery.setOnClickListener(new OnClickListener() { 
    @Override 
    public void onClick(View v) { 
     Intent intent = new Intent(); 
     intent.setType("image/*"); 
     intent.setAction(Intent.ACTION_GET_CONTENT); 
     startActivityForResult(Intent.createChooser(intent, ""), PICK_IMAGE); 
    } 
}); 

btnCapture.setOnClickListener(new OnClickListener() { 
    @Override 
    public void onClick(View v) { 
     final Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); 
     intent.putExtra(MediaStore.EXTRA_OUTPUT, setImageUri()); 
     startActivityForResult(intent, CAPTURE_IMAGE); 
    } 
}); 

@Override 
protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
    if (resultCode != Activity.RESULT_CANCELED) { 
     if (requestCode == PICK_IMAGE) { 
      selectedImagePath = getAbsolutePath(data.getData()); 
      imgUser.setImageBitmap(decodeFile(selectedImagePath)); 
     } else if (requestCode == CAPTURE_IMAGE) { 
      selectedImagePath = getImagePath(); 
      imgUser.setImageBitmap(decodeFile(selectedImagePath)); 
     } else { 
      super.onActivityResult(requestCode, resultCode, data); 
     } 
    } 
} 


public Bitmap decodeFile(String path) { 
    try { 
     // Decode image size 
     BitmapFactory.Options o = new BitmapFactory.Options(); 
     o.inJustDecodeBounds = true; 
     BitmapFactory.decodeFile(path, o); 
     // The new size we want to scale to 
     final int REQUIRED_SIZE = 70; 
     // Find the correct scale value. It should be the power of 2. 
     int scale = 1; 
     while (o.outWidth/scale/2 >= REQUIRED_SIZE && o.outHeight/scale/2 >= REQUIRED_SIZE) 
      scale *= 2; 
     // Decode with inSampleSize 
     BitmapFactory.Options o2 = new BitmapFactory.Options(); 
     o2.inSampleSize = scale; 
     return BitmapFactory.decodeFile(path, o2); 
    } catch (Throwable e) { 
     e.printStackTrace(); 
    } 
    return null; 
} 

public String getAbsolutePath(Uri uri) { 
    String[] projection = { MediaColumns.DATA }; 
    @SuppressWarnings("deprecation") 
    Cursor cursor = managedQuery(uri, projection, null, null, null); 
    if (cursor != null) { 
     int column_index = cursor.getColumnIndexOrThrow(MediaColumns.DATA); 
     cursor.moveToFirst(); 
     return cursor.getString(column_index); 
    } else 
     return null; 
}