How can I use button to play a sound with ListView?

问题

I want to add a button in ListView to play sound. The problem is the IDE (in List.java) cannot resolve this method mediaPlayer.create(this,R.raw.people);

The MainActivity.java code

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);
    }
}

The List.java code:

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(this,R.raw.people);
                        mediaPlayer.start();
                notifyDataSetChanged();
            }
        });

        return view;
    }
}

回答1:

The method signature is MediaPlayer create (Context context, int resid)

View.OnClickListener is not a Context, which is what this is in that case. BaseAdapter is also not a Context.

You can declare it in the adapter using MediaPlayer.create(List.this.context, R.raw.people)

来源：https://stackoverflow.com/questions/38646830/how-can-i-use-button-to-play-a-sound-with-listview