将歌曲从 Arraylist 传递到另一个 activity

Question

我想创建一个非常简单的应用程序来显示歌曲列表，当点击歌曲时它会打开一个新的 Activity 来显示歌曲的播放状态，我几乎创建了它但是当我点击播放按钮它不播放。

第一个activity:

    private Button buttonPlayStop;
    private MediaPlayer mMediaPlayer;
    private Context context;

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

    final ArrayList<Songs> songslist = new ArrayList<Songs>();
    songslist.add(new Songs("hhhhh", "cHU CHU ", R.drawable.mimi, R.raw.hhh));
    songslist.add(new Songs("hhhh", "cHU CHU ", R.drawable.jes1s, R.raw.hhh));
    songslist.add(new Songs("hhhh", "cHU CHU ", R.drawable.matt, R.raw.hhh));
    songslist.add(new Songs("hhhhh", "cHU CHU ", R.drawable.freind, R.raw.hhh));
    songslist.add(new Songs("hhhhh", "cHU CHU ", R.drawable.joe, R.raw.hhh));
    songslist.add(new Songs("hhhhh ", "cHU CHU ", R.drawable.bada, R.raw.hhh));
    songslist.add(new Songs("hhhhh", "cHU CHU ", R.drawable.abby, R.raw.hhh));

    final SongsAdapter adapter = new SongsAdapter(this, songslist);

    final ListView listView = (ListView) findViewById(R.id.listview);

    listView.setAdapter(adapter);
    listView.setOnItemClickListener(new   AdapterView.OnItemClickListener() {
        public void onItemClick(AdapterView<?> adapterView, View  view, int position, long l) {
            Songs song = songslist.get(position);

            Intent anotherActivityIntent = new  Intent(FunActivity.this, playingActivity.class);
            anotherActivityIntent.putExtra("songs",songslist);
            startActivity(anotherActivityIntent);

        }
    });

正在播放 activity:

    public class playingActivity extends FunActivity {
    private MediaPlayer mMediaPlayer;
    private Button buttonPlayStop;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_playing);
    ArrayList<Songs> songs =                    getIntent().getParcelableArrayListExtra("Songs");
    buttonPlayStop = (Button)findViewById(R.id.ButtonPlayStop);
    buttonPlayStop.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {

           mMediaPlayer.start();
        }
    });

   }

Answer 1

努力改变

 anotherActivityIntent.putExtra("songs",songslist);

到

 anotherActivityIntent.putParcelableArrayListExtra("songs",songslist);

同时更改您使用错误的键名songs & Songs 使双方相同

ArrayList<Songs> songs = getIntent().getParcelableArrayListExtra("songs");

您还需要在点击前投射 mMediaPlayer 对象

mMediaPlayer = (MediaPlayer)findViewById(You media player id);

Answer 2

未测试但是..

第一个activity:

改变
anotherActivityIntent.putExtra("songs",songslist);

到
anotherActivityIntent.putExtra("songs",song);

正在播放 activity:

改变
ArrayList<Songs> songs = getIntent().getParcelableArrayListExtra("Songs");

到

Songs songs = getIntent().getParcelableExtra("songs");

并且您需要在播放 activity 到
中添加一些代码 - 将歌曲翻译成它的路径（最好在歌曲 class 中找到路径）
- 设置 mMediaPlayer 的路径（请参阅 MediaPlayer.setDataSource(string)）
- 调用 mMediaPlayer.prepare()
- 然后调用 mMediaPlayer.start()

注意：在 onClickListener 中调用 mMediaPlayer.start()。onClick() 在您的代码中设置为 buttonPlayStop 似乎是一个拼写错误。

更多信息请参考MediaPlayer.StateDiagram or MediaPlayer developer guide。

将歌曲从 Arraylist 传递到另一个 activity

Pass songs from Arraylist to another activity

android

arraylist

parcelable

android-mediaplayer