访问外部存储权限问题android

Question

我试图找到所有的mp3文件在存储，但我的应用程序崩溃，我使用logcat看看为什么和问题的权限访问外部存储，但我已经把权限在清单，我不知道为什么不断崩溃。第一个错误：

03-06 14:55:24.553:E/dex2OAT(2796):创建oat文件失败：/data/dalvik-cache/x86/data@[e-mail]-2@[e-mail]:拒绝权限

public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    SongsManager songsManager = new SongsManager();
    songsManager.getSongs(this);
    ArrayList<Song> songList = songsManager.getSongsList();
    ArrayAdapter<Song> adapterSongList = new ArrayAdapter<Song>(this, android.R.layout.simple_list_item_1, songList);
    ListView listView = (ListView) findViewById(R.id.musicList);
    listView.setAdapter(adapterSongList);
}
}

public class SongsManager {

private ArrayList<Song> songsList;
public ArrayList<Song> getSongsList(){
    return songsList;
}
public void getSongs(Context ctx){
    ContentResolver musicResolver = ctx.getContentResolver();
    Uri musicUri = android.provider.MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
    Cursor musicCursor = musicResolver.query(musicUri, null, null, null, null);
    if(musicCursor!=null && musicCursor.moveToFirst()){
        //get columns
        int titleColumn = musicCursor.getColumnIndex(android.provider.MediaStore.Audio.Media.TITLE);
        int idColumn = musicCursor.getColumnIndex(android.provider.MediaStore.Audio.Media._ID);
        int artistColumn = musicCursor.getColumnIndex(android.provider.MediaStore.Audio.Media.ARTIST);
        int pathConlumn = musicCursor.getColumnIndex(android.provider.MediaStore.Audio.Media.DATA);
        do {
            long thisId = musicCursor.getLong(idColumn);
            String thisTitle = musicCursor.getString(titleColumn);
            String thisArtist = musicCursor.getString(artistColumn);
            String thisPath = musicCursor.getString(pathConlumn);
            songsList.add(new Song(thisId, thisTitle, thisArtist, thisPath));
        }
        while (musicCursor.moveToNext());
    }
}
}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="felipe.cursoandroid.com.musicbox">
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

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


</manifest>

Answer 1

你用的是哪个Android版本？请注意，对于6+，您应该询问运行时的权限