Question

我正在尝试开发音乐播放器应用。

首先，我从listview中选择一首音乐。然后音乐播放屏幕打开选定的音乐。同时出现通知。无论您身在何处，如果单击通知，音乐播放器屏幕将打开当前音乐。然后，如果需要，可以按返回按钮进入音乐列表。

在API 19上;在通知音乐播放屏幕并按下后退按钮后，会显示音乐列表，但不会点击项目。但更高的API没有问题。

唯一的麻烦;来自API 19的通知小组。

我无法理解这个问题。音乐列表onCreate方法如下。

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.showmusicfiles);

    filesFound=(ListView)findViewById(R.id.files_found);
    items = new ArrayList<FileItem>();

    context = getApplicationContext();

   String path = Environment.getExternalStorageDirectory() +
           File.separator + "MusicApp"+File.separator+"mp3";
     File f = new File(path);
    final File fileList[] = f.listFiles();
    for (File file : f.listFiles()) {

        FileItem item=new FileItem();
        item.setDescription(file.getName());
        item.setFullPath(file.getAbsolutePath());
        items.add(item);
    }

    searchResults=sortByDate(items);

    adapter = new ArrayAdapter<FileItem>(getApplicationContext(), R.layout.music_file_item, searchResults){
        @Override
        public View getView(final int position, View convertView, ViewGroup parent) {
            if(convertView == null){
                convertView = getLayoutInflater().inflate(R.layout.music_file_item, parent, false);
            }

            TextView description = (TextView)convertView.findViewById(R.id.file_description);

            final FileItem searchResult = searchResults.get(position);
            description.setText(searchResult.getDescription().replace(".mp3",""));

            convertView.setOnLongClickListener(new View.OnLongClickListener() {
                @Override
                public boolean onLongClick(View v) {
                    DialogInterface.OnClickListener dialogClickListener = new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            switch (which){
                                case DialogInterface.BUTTON_POSITIVE:
                                    deleteFileFromList(searchResults.get(position).getFullPath(),position);
                                    break;

                                case DialogInterface.BUTTON_NEGATIVE:
                                    toast("yoh dedın");
                                    break;
                            }
                        }
                    };

                    AlertDialog.Builder builder = new AlertDialog.Builder(ShowMusicFiles.this);
                    builder.setMessage("Are you sure you want to delete").setPositiveButton("Yes", dialogClickListener)
                            .setNegativeButton("No", dialogClickListener).show();


                    return true;
                }
            });



            convertView.setOnClickListener(new View.OnClickListener(){
                @Override
                public void onClick(View v){
                    FileTypeList = new ArrayList<File>();
                    FileTypeList = FileItemToFile(searchResults);
                    DescriptionList= new ArrayList<String>();
                    DescriptionList = getDescriptionList(searchResults);

                    playerIntent = new Intent(context, MusicPlayer.class);
                    playerIntent.putExtra("songPosition",position);
                    playerIntent.putExtra("songList",FileTypeList);
                    playerIntent.putExtra("descriptionList",DescriptionList);
                    playerIntent.putExtra("fromWhere","musicList");

                    playerIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                    context.startActivity(playerIntent);
                }
            });
            return convertView;
        }
    };

    filesFound.setAdapter(adapter);

    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
    final ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
    drawer.setDrawerListener(toggle);
    toggle.syncState();

    NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view_music);
    navigationView.setNavigationItemSelectedListener(this);
}

我在音乐播放屏幕上的背压方法仅包括转到音乐列表页面的意图。所以我不认为我需要写入音乐播放代码。

感谢。

@Override
public void onBackPressed() {
    Intent goToMusicList = new Intent(MusicPlayer.this,ShowMusicFiles.class);
    startActivity(goToMusicList);
}

Answer 1

在filesFOund.invalidate()之前致电filesFound.setAdapter(adapter)。如果这不能解决问题，那么尝试将ShowMusicFiles活动的launchMode设置为singleTop。

Listview项目未在API 19上单击，而是单击上层API

1 个答案: