选项卡屏幕显示空白活动

Question

public class SongsTab extends Fragment {
    private ArrayList<songInfo> _songs = new ArrayList<songInfo>();
    RecyclerView recyclerView;
    SeekBar seekBar;
    songAdapter songAdapter1;
    MediaPlayer mediaPlayer;
    private Handler myHandler = new Handler();

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View v = inflater.inflate(R.layout.fragment_main, container, false);
        recyclerView = (RecyclerView)v. findViewById(R.id.recyclerView);
        CardView cardView = (CardView) v.findViewById(R.id.card);
        seekBar = (SeekBar) v.findViewById(R.id.seekBar);
        songAdapter1 = new songAdapter(getActivity(),_songs);
        recyclerView.setAdapter(songAdapter1);
        LinearLayoutManager linearLayoutManager = new LinearLayoutManager(getActivity());
        DividerItemDecoration dividerItemDecoration = new DividerItemDecoration(recyclerView.getContext(),
                linearLayoutManager.getOrientation());
        recyclerView.setLayoutManager(linearLayoutManager);
        recyclerView.addItemDecoration(dividerItemDecoration);
        songAdapter1.setOnItemClickListener(new songAdapter.OnItemClickListener() {
            @Override
            public void onItemClick(RecyclerView.ViewHolder holder, View view, final songInfo obj, int position) {
                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(obj.getSongUrl());
                                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());
                                    }
                                });
                                Log.i("devesh","vikas");



                            }catch (Exception e){}
                        }

                    };
                    myHandler.postDelayed(runnable,100);

                }
            }
        });
        checkUserPermission();

        Thread t = new runThread();
        t.start();
        return v;
    }

    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(getActivity(), 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 cursor = getContext().getContentResolver().query(uri,null,selection,null,null);
        if(cursor != null){
            if(cursor.moveToFirst()){
                do{
                    String name = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.ALBUM));
                    String artist = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.ARTIST));
                    String url = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.DATA));

                    songInfo s = new songInfo(name,artist,url);
                    _songs.add(s);
                    songAdapter1.notifyDataSetChanged();
                }while (cursor.moveToNext());
            }

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

        }
    }
}

我试图在标签活动中获取歌曲列表但是当应用程序运行时它显示为空白并说：

没有附加适配器，跳过布局

但是当我在没有tab活动的其他项目中运行相同的代码时，它工作正常。请帮忙。如果您需要其他详细信息，请告诉我们。

这是我的logact：

没有适配器;跳过布局01-04 02：56：42.346 24747-24775 / com.example.murarilal.musicmania E / EGL_emulation：tid 24775：eglSurfaceAttrib（1223）：error 0x3009（EGL_BAD_MATCH）01-04 02：56：42.346 24747-24775 / com.example.murarilal.musicmania W / OpenGLRenderer：无法在表面0x9e211d00上设置EGL_SWAP_BEHAVIOR，错误= EGL_BAD_MATCH 01-04 02：56：42.352 24747-24747 / com.example.murarilal.musicmania I / Choreographer：跳过33帧！应用程序可能在其主线程上做了太多工作。 01

Answer 1

我想你已经夸大了错误的XML。如果有fragment_songs_tab，尝试膨胀fragment_main而不是fragment_songs_tab.xml

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    View v = inflater.inflate(R.layout.fragment_songs_tab, container, false);
    return v;
 }

@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);
    // add your code here which executes after the execution of onCreateView() method.

}

请参阅Difference Between ViewCreated and CreateView

Difference between onCreateView and onViewCreated in Fragment