没有适配器连接，跳过布局 [英] No adapter attach,skipping layout

问题描述

我收到一个错误消息，说没有适配器连接跳过布局.模拟器运行时该列表没有出现.请帮助.我在列表中看不到任何内容.屏幕显示为空白.该活动中的其他项目正在出现.在互联网上几乎看到了所有答案，但没有任何解决办法

I am getting an error saying no adapter attach skipping layout.and the list doesn't appear in when emulator runs.please help.I cant see anything in list.screen appears blank.other items in the activity are appearing.i have seen almost all answer on the internet but didn't get any solution

这是logcat错误. E/RecyclerView:未连接适配器；跳过 布局

this is the logcat error. E/RecyclerView: No adapter attached; skipping layout

public class SongsTab extends Fragment {

    private ArrayList<songInfo> _songs = new ArrayList<>();
    ;
    RecyclerView recyclerView;
    SeekBar seekBar;
    songAdapter songAdapter1;
    MediaPlayer mediaPlayer;
    private Handler myHandler = new Handler();
    Cursor cursor;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View v = inflater.inflate(R.layout.songs, container, false);
        recyclerView = v.findViewById(R.id.recyclerView);
        seekBar = v.findViewById(R.id.seekBar);
        songAdapter1 = new songAdapter(_songs, getContext());
        LinearLayoutManager linearLayoutManager = new LinearLayoutManager(getActivity());
        DividerItemDecoration dividerItemDecoration = new DividerItemDecoration(recyclerView.getContext(),
                linearLayoutManager.getOrientation());
        recyclerView.setLayoutManager(linearLayoutManager);
        recyclerView.addItemDecoration(dividerItemDecoration);
        recyclerView.setAdapter(songAdapter1);
        songAdapter1.setOnitemClickListener(new songAdapter.OnitemClickListener() {
            @Override
            public void onItemclick(songAdapter.ViewHolder holder, View v, songInfo obj, int position) {
                System.gc();
                int songPath = cursor.getColumnIndex(MediaStore.Audio.Media.DATA);
                cursor.moveToPosition(position);
                final String filename = cursor.getString(songPath);
                if (mediaPlayer.isPlaying()) {
                    mediaPlayer.stop();
                    mediaPlayer.reset();
                    mediaPlayer.release();
                    mediaPlayer = null;

                } else {

                    Runnable runnable = new Runnable() {
                        @Override
                        public void run() {
                            try {
                                mediaPlayer = new MediaPlayer();
                                mediaPlayer.setDataSource(filename);
                                mediaPlayer.prepareAsync();
                                mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
                                    @Override
                                    public void onPrepared(MediaPlayer mp) {
                                        mp.start();
                                        seekBar.setProgress(0);
                                        seekBar.setMax(mediaPlayer.getDuration());
                                        Log.d("Prog", "run: " + mediaPlayer.getDuration());
                                    }
                                });


                            } catch (Exception e) {
                            }
                        }

                    };
                    myHandler.postDelayed(runnable, 100);

                }

            }

        });
        checkUserPermission();

        Thread t = new runThread();
        t.start();

    return null;
}


    public class runThread extends Thread {


        @Override
        public void run() {
            while (true) {

                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                Log.d("Runwa", "run: " + 1);
                if (mediaPlayer != null) {
                    seekBar.post(new Runnable() {
                        @Override
                        public void run() {
                            seekBar.setProgress(mediaPlayer.getCurrentPosition());
                        }
                    });

                    Log.d("Runwa", "run: " + mediaPlayer.getCurrentPosition());
                }
            }
        }

    }

    private void checkUserPermission(){
        if(Build.VERSION.SDK_INT>=23){
            if(ActivityCompat.checkSelfPermission(getContext(), Manifest.permission.READ_EXTERNAL_STORAGE)
                    != PackageManager.PERMISSION_GRANTED){
                requestPermissions(new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},123);
                return;
            }
        }
        loadSongs();
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        switch (requestCode){
            case 123:
                if (grantResults[0] == PackageManager.PERMISSION_GRANTED){
                    loadSongs();
                }else{
                    Toast.makeText(getContext(), "Permission Denied", Toast.LENGTH_SHORT).show();
                    checkUserPermission();
                }
                break;
            default:
                super.onRequestPermissionsResult(requestCode, permissions, grantResults);

        }

    }

    private void loadSongs(){
        Uri uri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
        String selection = MediaStore.Audio.Media.IS_MUSIC+"!=0";
         cursor =getActivity().getContentResolver().query(uri,null,selection,null,null);
        if(cursor != null){
            if(cursor.moveToFirst()){
                do{
                    String name = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.TITLE));
                    String artist = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.ARTIST));
                    int songPath = cursor.getColumnIndex(MediaStore.Audio.Media.DATA);

                    songInfo s = new songInfo(name,artist,songPath);
                    _songs.add(s);

                }while (cursor.moveToNext());
            }

            cursor.close();
            songAdapter1 = new songAdapter(_songs,getActivity());

        }
    }
}

推荐答案

因为您的_congs ArrayList是Empty.

Because Your _songs ArrayList is Empty.

这篇关于没有适配器连接，跳过布局的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！