BitmapFactory解碼返回null

我現在正在處理一個奇怪的事情。我的代碼曾經工作到幾天前停止工作。我正在從圖庫中選擇一幅圖像，並希望獲取它的位圖對象。我的代碼：BitmapFactory解碼返回null

imgDecodableString = "/storage/emulated/0/DCIM/Camera/IMG_20160114_141351594.jpg" 

Bitmap decodedBitmap = BitmapFactory.decodeFile(imgDecodableString); 
Log.d(Constants.TAG, "decodedBitmap: " + decodedBitmap);

位圖現在是空（用於工作），我真的不明白什麼是錯的。沒有改變我的代碼。有沒有人有這個問題？謝謝。

我有權限：

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/> 
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

來源

2016-09-07 user1140656

如果您使用的Android 6.0比你需要運行時寫入外部存儲 –

if (CheckPermission(youractivity.this, Manifest.permission.WRITE_EXTERNAL_STORAGE)) { 
// you have permission go ahead 

String imgDecodableString = "/storage/emulated/0/DCIM/Camera/IMG_20160114_141351594.jpg"; 

if(new File(imgDecodableString).exists()){ 
Bitmap decodedBitmap = BitmapFactory.decodeFile(imgDecodableString); 
Log.d("Tag", "decodedBitmap: " + decodedBitmap);} 
} else { 
// you do not have permission go request runtime permissions 
RequestPermission(youractivity.this, Manifest.permission.WRITE_EXTERNAL_STORAGE, REQUEST_RUNTIME_PERMISSION); 
} 



@Override 
public void onRequestPermissionsResult(int permsRequestCode, String[] permissions, int[] grantResults) { 

    switch (permsRequestCode) { 

     case REQUEST_RUNTIME_PERMISSION: { 
      if (grantResults.length > 0 
        && grantResults[0] == PackageManager.PERMISSION_GRANTED) { 

      } else { 
       // you do not have permission show toast. 
      } 
      return; 
     } 
    } 
} 
public void RequestPermission(Activity thisActivity, String Permission, int Code) { 
    if (ContextCompat.checkSelfPermission(thisActivity, 
      Permission) 
      != PackageManager.PERMISSION_GRANTED) { 
     if (ActivityCompat.shouldShowRequestPermissionRationale(thisActivity, 
       Permission)) { 

     } else { 
      ActivityCompat.requestPermissions(thisActivity, 
        new String[]{Permission}, 
        Code); 
     } 
    } 
} 

public boolean CheckPermission(Activity context, String Permission) { 
    if (ContextCompat.checkSelfPermission(context, 
      Permission) == PackageManager.PERMISSION_GRANTED) { 
     return true; 
    } else { 
     return false; 
    } 
}

在androidmainfest

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/> 
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

來源

2016-09-07 11:34:46

您需要刪除從第一線的意見，就應該是這樣的

imgDecodableString = "/storage/emulated/0/DCIM/Camera/IMG_20160114_141351594.jpg" 

Bitmap decodedBitmap = BitmapFactory.decodeFile(imgDecodableString); 
Log.d(Constants.TAG, "decodedBitmap: " + decodedBitmap);

來源

2016-09-07 11:25:48 Max

，請使用以下代碼：

if(imgDecodableString.exists()){ 
Bitmap decodedBitmap = BitmapFactory.decodeFile(imgDecodableString); 
Log.d(Constants.TAG, "decodedBitmap: " + decodedBitmap);}

希望它會有所幫助。

來源

2016-09-07 11:29:04 Yogendra

嗨的許可，感謝，但您是否使用棉花糖版本肯定:) – user1140656

圖像存在？ – Yogendra

BitmapFactory解碼返回null

回答

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