在棉花糖存储权限错误 [英] Storage permission error in Marshmallow

问题描述

在棒棒糖，下载功能工作正常，在我的应用程序，但是当我升级到棉花糖，我的应用程序崩溃，当我尝试从互联网上下载到SD卡中给出了这样的错误：

In Lollipop, the download functionality works fine in my app, but when I upgraded to Marshmallow, my app crashes and gives this error when I try to download from the internet into the sd card:

Neither user  nor current process has android.permission.WRITE_EXTERNAL_STORAGE

据抱怨这行code：

It complains about this line of code:

DownloadManager manager = (DownloadManager) getSystemService(Context.DOWNLOAD_SERVICE);
    manager.enqueue(request);

我在清单之外的应用程序的权限：

I have the permissions in the manifest outside application:

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

我清理和重建项目，但仍然崩溃。

I cleaned and rebuilt the project, but still crashes.

任何想法是AP preciated。

Any ideas are appreciated.

推荐答案

您应该如果用户已授予的外部存储权限通过检查：

You should be checking if the user has granted permission of external storage by using:

if (checkSelfPermission(android.Manifest.permission.WRITE_EXTERNAL_STORAGE)
                == PackageManager.PERMISSION_GRANTED) {
            Log.v(TAG,"Permission is granted");
            return true;
      }

如果没有，你需要问用户授予您的应用程序权限：

If not, you need to ask the user to grant your app a permission:

ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, REQUEST_CODE);

当然，这些都是棉花糖设备只所以你需要检查，如果您的应用程序上运行的棉花糖：

Of course these are for marshmallow devices only so you need to check if your app is running on Marshmallow:

 if (Build.VERSION.SDK_INT >= 23) {
      //do your check here
  }

要同时也要确保你的活动器具 OnRequestPermissionResult

整个许可是这样的：

public  boolean isStoragePermissionGranted() {
    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}, 1);
            return false;
        }
    }
    else { //permission is automatically granted on sdk<23 upon installation
        Log.v(TAG,"Permission is granted");
        return true;
    }


}

许可结果的回调：

Permission result callback:

@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    if(grantResults[0]== PackageManager.PERMISSION_GRANTED){
        Log.v(TAG,"Permission: "+permissions[0]+ "was "+grantResults[0]);
        //resume tasks needing this permission
    }
}

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