xml - Android无权读取content://media/external/audio/media

Question

在我的应用程序API级别targetSdkVersion 23中，我添加了以下权限:

    <?xml version="1.0" encoding="utf-8"?>
        <manifest xmlns:android="http://schemas.android.com/apk/res/android"
            package="my.mymetaextractor" >

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

            <application
                android:allowBackup="true"
                android:icon="@mipmap/ic_launcher"
                android:label="@string/app_name"
                android:supportsRtl="true"
                android:theme="@style/AppTheme" >
                <activity android:name=".MetaExtractActivity" >
                    <intent-filter>
                        <action android:name="android.intent.action.MAIN" />

                        <category android:name="android.intent.category.LAUNCHER" />
                    </intent-filter>
                </activity>
            </application>

        </manifest>

当我尝试执行以下命令时:

    String[] STAR = {"*"};
    Uri allsongsuri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
    //  Uri allsongsuri = MediaStore.Audio.Media.INTERNAL_CONTENT_URI;
    String selection = MediaStore.Audio.Media.IS_MUSIC + " != 0";
    Cursor cursor = null;


    try {

      this.grantUriPermission("my.mymetaextractor",        
      allsongsuri, Intent.FLAG_GRANT_WRITE_URI_PERMISSION |     
     Intent.FLAG_GRANT_READ_URI_PERMISSION);
        cursor = managedQuery(allsongsuri, STAR, selection, null,  
    null);
    } catch (Exception e) {
        String msg = e.getMessage();
        Log.i("tag", "wait");
    }

我收到 异​​常:

java.lang.SecurityException: Uid 10209 does not have permission to uri 0 @ content://media/external/audio/media

但是Uri allsongsuri = MediaStore.Audio.Media.INTERNAL_CONTENT_URI;有效。 Uri allsongsuri = MediaStore.Audio.Media.INTERNAL_CONTENT_URI;的异常(exception)

请注意，相同的代码在较旧的设备android 4中也能很好地工作。但是对于android 6来说，它确实发生了。请如何解决此问题。

Answer 1

您需要在运行时不仅在 list 中要求此许可权:permissions

如果(ContextCompat.checkSelfPermission(this，“android.permission.WRITE_EXTERNAL_STORAGE”)!= PackageManager.PERMISSION_GRANTED)
requestPermissions(new String [] {“android.permission.READ_PHONE_STATE”}，0);