为什么MediaPlayer中的声音无法播放?

时间:2016-07-29 01:27:01

标签: android listview android-mediaplayer

问题在于声音无法播放。

当我运行应用程序时,这句话出现在(Android Mointor)“D / AbsListView:unregisterIRListener()被称为”

MainActivity.java代码

public class MainActivity extends AppCompatActivity {
     @Override
        public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
        ArrayList<String> list = new ArrayList<String>();
        list.add("item1");


        //instantiate custom adapter
        List adapter = new List(list, this);

        //handle listview and assign adapter
        ListView lView = (ListView)findViewById(R.id.listView);
        lView.setAdapter(adapter);
    }

}

List.java代码:

public class List extends BaseAdapter implements ListAdapter {
    private ArrayList<String> list = new ArrayList<String>();
    private Context context;
     MediaPlayer mediaPlayer;


    public List(ArrayList<String> list, Context context) {
        this.list = list;
        this.context = context;
    }

    @Override
    public int getCount() {
        return list.size();
    }

    @Override
    public Object getItem(int pos) {
        return list.get(pos);
    }

    @Override
    public View getView(final int position, View convertView, ViewGroup parent) {
        View view = convertView;
        if (view == null) {
            LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            view = inflater.inflate(R.layout.activity_list, null);
        }

        //Handle TextView and display string from your list
        TextView listItemText = (TextView)view.findViewById(R.id.list_item_string);
        listItemText.setText(list.get(position));

        //Handle buttons and add onClickListeners

        Button addBtn = (Button)view.findViewById(R.id.add_btn);


        addBtn.setOnClickListener(new View.OnClickListener(){


            @Override
            public void onClick(View v) {
                  MediaPlayer.create(List.this.context, R.raw.people)
                        mediaPlayer.start();
                notifyDataSetChanged();
            }
        });

        return view;
    }
}

3 个答案:

答案 0 :(得分:1)

试试这个:

@Override
public void onClick(View v) {
    mediaPlayer = MediaPlayer.create(context,R.raw.people);
    mediaPlayer.start();
    notifyDataSetChanged();
}

答案 1 :(得分:1)

您可以使用以下方法播放声音。它可以通过互联网的存储或网址播放。

public void playAudio(String audioPath) {
    try {
        MediaPlayer mp = new MediaPlayer();
        mp.setAudioStreamType(AudioManager.STREAM_MUSIC);
        mp.setDataSource(audioPath);
        mp.prepare();
        mp.start();
        Log.d(TAG, "is playing audio...");
    } catch (Exception e) {
        Log.d(TAG, "cannot play audio: " + e.toString());
    }
}

答案 2 :(得分:1)

我认为您必须将this更改为context

 addBtn.setOnClickListener(new View.OnClickListener(){


        @Override
        public void onClick(View v) {
            mediaPlayer.create(context,R.raw.people);
            mediaPlayer.start();
            notifyDataSetChanged();
        }
    });