Question

我使用以下代码创建了一个播放列表

ContentValues cv = new ContentValues();

        cv.put(MediaStore.Audio.Playlists.NAME, "123456");

        //Uri uri = getContentResolver().insert(MediaStore.Audio.Playlists.getContentUri("external"), cv);
        Uri uri = getContentResolver().insert(MediaStore.Audio.Playlists.INTERNAL_CONTENT_URI, cv);
        if (uri != null)
        {
            Toast.makeText(getApplicationContext(),uri.toString(), 
                    Toast.LENGTH_LONG).show();
        }

每次运行代码时，我都会在内容中创建播放列表的详细信息：// media / internal / audio / playlists，然后显示播放列表的ID

现在此活动用于显示手机中的播放列表

public class playlist extends ListActivity {

    //define source of MediaStore.Images.Media, internal or external storage
    Uri sourceUri = MediaStore.Audio.Playlists.EXTERNAL_CONTENT_URI;
    //Uri sourceUri = MediaStore.Audio.Playlists.INTERNAL_CONTENT_URI;

    SimpleCursorAdapter mySimpleCursorAdapter;

    @SuppressLint("NewApi")
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        String[] from = {MediaStore.Audio.Playlists.NAME};
        int[] to = {android.R.id.text1};

        CursorLoader cursorLoader = new CursorLoader(
                this, 
                sourceUri, 
                null, 
                null, 
                null, 
                MediaStore.Audio.Playlists.NAME);

        Cursor cursor = cursorLoader.loadInBackground();

        mySimpleCursorAdapter = new SimpleCursorAdapter(
                this, 
                android.R.layout.simple_list_item_1, 
                cursor, 
                from, 
                to, 
                CursorAdapter.FLAG_REGISTER_CONTENT_OBSERVER);

        setListAdapter(mySimpleCursorAdapter);

        getListView().setOnItemClickListener(myOnItemClickListener);
        getListView().setOnItemLongClickListener (myOnItemLongClickListener);
        getListView().setLongClickable(true);
    }

    OnItemClickListener myOnItemClickListener
    = new OnItemClickListener(){

        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position,
                long id) {
            Cursor cursor = mySimpleCursorAdapter.getCursor();
            cursor.moveToPosition(position);
            String _id = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Playlists._ID));
            Uri selUri = Uri.withAppendedPath(sourceUri, _id);


            Intent i=new Intent(playlist.this,getsongfromplaylist.class);
            i.putExtra("id", _id);
            playlist.this.startActivity(i);
        }

    };

        OnItemLongClickListener myOnItemLongClickListener
        = new OnItemLongClickListener(){
            @Override
            public boolean onItemLongClick(AdapterView<?> parent, View view,
                    int position, long id) {
                Cursor cursor = mySimpleCursorAdapter.getCursor();
                cursor.moveToPosition(position);
                String _id = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Playlists._ID));
                Uri selUri = Uri.withAppendedPath(sourceUri, _id);

                Intent i=new Intent(playlist.this,popuplist.class);
                i.putExtra("id", _id);
                playlist.this.startActivity(i);
                return true;
            }

        };

在此活动中，所有播放列表都显示在手机中可用，但新创建的播放列表未显示

对于我手机预装的默认音乐播放器也会出现这种情况

现在我知道问题是

带

Uri uri = getContentResolver().insert(MediaStore.Audio.Playlists.INTERNAL_CONTENT_URI, cv);

在createplaylist代码中

和

Uri sourceUri = MediaStore.Audio.Playlists.INTERNAL_CONTENT_URI;

显示播放列表活动中的

如果我更改了活动崩溃的相应代码中的internal or external content uri

所以我的问题会

1）如何使用external content uri

创建播放列表

2）如何使用两者显示播放列表和所有其他播放列表 external content uri和internal content uri

使用ContentResolver创建的新播放列表不会显示在播放列表

0 个答案: