2017-03-16 61 views
0

您好所有,Android的:不能在SD卡写入三星设备与棉花糖

我想在三星设备的SD卡与棉花糖创建一个文件夹。但是,api,dir.canWrite()失败了,这意味着我不能写入该路径。同样我在moto x中尝试过它的工作。

有人请帮助我

更新:

我在清单的所有权限,也为运行许可的代码。

清单文件:

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

运行许可代码:

private final int WRITE_STORAGE_CODE = 10; 
@TargetApi(23) 
public boolean isStoragePermissionGrantedForWriteStorage() { 
    if (Build.VERSION.SDK_INT >= 23) { 
     if (checkSelfPermission(android.Manifest.permission.WRITE_EXTERNAL_STORAGE) 
       == PackageManager.PERMISSION_GRANTED) { 
      Log.v(TAG,"Permission is granted"); 
      return true; 
     } else { 

      Log.v(TAG,"Permission is revoked"); 
      ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, WRITE_STORAGE_CODE); 
      return false; 
     } 
    } 
    else { //permission is automatically granted on sdk<23 upon installation 
     Log.v(TAG,"Permission is granted"); 
     return true; 
    } 
} 

@Override 
public void onRequestPermissionsResult(int requestCode, 
     String permissions[], int[] grantResults) { 
    switch (requestCode) { 
     case WRITE_STORAGE_CODE: { 
      // If request is cancelled, the result arrays are empty. 
      if (grantResults.length > 0 
       && grantResults[0] == PackageManager.PERMISSION_GRANTED) { 

       File dir = new File("/storage/6A6B-1CEF/"); // This is the memory card location. 

       if(dir.canWrite()) 
       { 
        Log.d("Activity", can write here!!); 
       }else{ 
        Log.d("Activity", oops!!!!, can't write here!!);     } 
      } else { 

       // permission denied, boo! Disable the 
       // functionality that depends on this permission. 
       Log.d("Activity", permission denied); 
      } 
      return; 
     } 

     // other 'case' lines to check for other 
     // permissions this app might request 
    } 
} 

所以,每当我在三星设备调用此代码,它的打印,我不能在该位置写。但是相同的代码允许我在Moto x设备中编写代码。

注:

我已阅读,棉花糖必须有存储卡,无论是“内部存储”或“移动存储”选项。我选择了两款手机(三星和摩托罗拉)的便携式存储器,但该代码仅在三星中出现故障。

+1

是否增加了运行时权限? – rafsanahmad007

+1

在Marshmallow中,你需要在做任何文件操作之前先要求权限,否则会给出SecurityException。 –

+0

'但是API,dir.canWrite()失败'。不要这样想。如果无法写入,该函数将返回false。 – greenapps

回答

0

您在清单文件中添加了权限?

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> 
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" /> 
+0

是的,我有..我也更新了这个问题。 @ M.Saad Lakhan –