Question

我有一个播放列表视图/ [使用按钮和停止。我设法实现它们但我有一个问题。我从一个位置点击播放按钮，它正确升级，但如果我从不同的位置点击另一个播放按钮来自前一个位置的音乐停止但是画面不会变回播放，仍然暂停。有人可以帮忙吗？

package com.example.android.musicapp;

import android.content.Context;
import android.media.MediaPlayer;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import java.util.ArrayList;

public class MusicAdapter extends BaseAdapter {
    private Context context;
    private int layout;
    private int currentPosition;
    private ArrayList arrayList;
    private MediaPlayer mediaPlayer;
    private boolean flag = true;
private ImageView currentPlayingButton;
    public MusicAdapter(Context context, int layout, ArrayList<Music> arrayList) {
        this.context = context;
        this.layout = layout;
        this.arrayList = arrayList;
    }


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

    @Override
    public Object getItem(int position) {
        return null;
    }

    @Override
    public long getItemId(int position) {
        return 0;
    }
    private class Holder{
        TextView textName,textAlbum;
        ImageView play, stop;
    }


    @Override
    public View getView(final int pos, View convertView, final ViewGroup parent) {
        final Holder holder;
        final int position = pos;
        if (convertView == null){
            holder = new Holder();
            LayoutInflater layoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = layoutInflater.inflate(layout,null);
            holder.textName = (TextView) convertView.findViewById(R.id.textName);
            holder.textAlbum = (TextView) convertView.findViewById(R.id.textAlbum);
            holder.play = convertView.findViewById(R.id.play);
            holder.stop = convertView.findViewById(R.id.stop);
            currentPlayingButton= holder.play;
            convertView.setTag(holder);
        }else {
            holder = (Holder) convertView.getTag();

        }


        final Music music = (Music) arrayList.get(position);
        holder.textName.setText(music.getName());
        holder.textAlbum.setText(music.getAlbum());
 if (currentPlayingButton != null) {
            holder.play.setImageResource(R.drawable.ic_play);
            currentPlayingButton = holder.play;
        }
        holder.play.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                if(mediaPlayer == null){

                    mediaPlayer = MediaPlayer.create(context, music.getSong());
                    mediaPlayer.start();
                    currentPosition = position;
                     holder.play.setImageResource(R.drawable.pause);
currentPlayingButton= holder.play;
                } else {
                           if (currentPosition != position) {

                    mediaPlayer.reset();
                    mediaPlayer.release();
                    if (currentPlayingButton!=null){
                    currentPlayingButton.setImageResource(R.drawable.ic_play);}
                    currentPlayingButton = holder.play;

                    mediaPlayer = MediaPlayer.create(context, music.getSong());
                    mediaPlayer.start();
                    holder.play.setImageResource(R.drawable.pause);
                    currentPosition = position;
                } else {
                    if (mediaPlayer.isPlaying()) {
                        Log.v("Adapter", "mediaPlayer should be playing here" + mediaPlayer.isPlaying());
                        mediaPlayer.pause();
                        holder.play.setImageResource(R.drawable.ic_play);
                        currentPlayingButton = null;
                    } else {
                        Log.v("Adapter", "mediaPlayer shouldn't be playing here" + mediaPlayer.isPlaying());
                        mediaPlayer.start();
                        holder.play.setImageResource(R.drawable.pause);
                        currentPlayingButton=holder.play;
                    }
                    }
                }

            }});
holder.stop.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if(mediaPlayer != null){

                    mediaPlayer.stop();
                    mediaPlayer.release();
                    mediaPlayer = null;
                    holder.play.setImageResource(R.drawable.ic_play);

                }
            }

        });


        return convertView;
}
}

Answer 1

我设法解决了这个问题。这是我的代码现在正常工作

public class MusicAdapter extends BaseAdapter {
    private Context context;
    private int layout;
    private int currentPosition;
    private ArrayList arrayList;
    private MediaPlayer mediaPlayer;
    private ImageView currentPlayingButton;
    private boolean isPlaying;

    public MusicAdapter(Context context, int layout, ArrayList<Music> arrayList) {
        this.context = context;
        this.layout = layout;
        this.arrayList = arrayList;
    }

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

    @Override
    public Object getItem(int position) {
        return arrayList.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    private class Holder {
        TextView textName, textAlbum;
        ImageView play, stop;
    }

    @Override
    public View getView(final int pos, View convertView, final ViewGroup parent) {
        final Holder holder;
        final int position = pos;
        if (convertView == null) {
            holder = new Holder();
            LayoutInflater layoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = layoutInflater.inflate(layout, null);
            holder.textName =  convertView.findViewById(R.id.textName);
            holder.textAlbum =  convertView.findViewById(R.id.textAlbum);
            holder.play = convertView.findViewById(R.id.play);
            holder.stop = convertView.findViewById(R.id.stop);
            currentPlayingButton = holder.play;
            convertView.setTag(holder);
        } else {
            holder = (Holder) convertView.getTag();
        }
        final Music music = (Music) arrayList.get(position);
        holder.textName.setText(music.getName());
        holder.textAlbum.setText(music.getAlbum());
        if (currentPosition != position) {
            holder.play.setImageResource(R.drawable.ic_play);
        } else {
            if (isPlaying) {
                holder.play.setImageResource(R.drawable.pause);
            } else {
                holder.play.setImageResource(R.drawable.ic_play);
            }
        }
        holder.play.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                if (mediaPlayer == null) {
                    mediaPlayer = MediaPlayer.create(context, music.getSong());
                    mediaPlayer.start();
                    currentPosition = position;
                    holder.play.setImageResource(R.drawable.pause);
                    currentPlayingButton = holder.play;
                    isPlaying = true;
                } else {
                    if (currentPosition != position) {
                        mediaPlayer.reset();
                        mediaPlayer.release();
                        currentPlayingButton.setImageResource(R.drawable.ic_play);
                        currentPlayingButton = holder.play;

                        mediaPlayer = MediaPlayer.create(context, music.getSong());
                        mediaPlayer.start();
                        isPlaying = true;
                        holder.play.setImageResource(R.drawable.pause);
                        currentPosition = position;
                    } else {
                        if (mediaPlayer.isPlaying()) {
                            mediaPlayer.pause();
                            isPlaying = false;
                            holder.play.setImageResource(R.drawable.ic_play);
                        } else {
                            mediaPlayer.start();
                            isPlaying = true;
                            holder.play.setImageResource(R.drawable.pause);
                        }
                    }
                }
            }
        });
        holder.stop.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (mediaPlayer != null) {

                    mediaPlayer.stop();
                    mediaPlayer.release();
                    mediaPlayer = null;
                    holder.play.setImageResource(R.drawable.ic_play);
                    isPlaying = false;
                }
            }
        });
        return convertView;
    }
}

暂停按钮listview不升级

1 个答案: