Android应用开发-MP3音乐播放器代码实现（三），腾讯android面试题社招

music_progressBar = (SeekBar) findViewById(R.id.audioTrack);

currentProgress = (TextView) findViewById(R.id.current_progress);

finalProgress = (TextView) findViewById(R.id.final_progress);

}

/**

给每一个按钮设置监听器

private void setViewOnclickListener() {

ViewOnclickListener ViewOnClickListener = new ViewOnclickListener();

previousBtn.setOnClickListener(ViewOnClickListener);

repeatBtn.setOnClickListener(ViewOnClickListener);

playBtn.setOnClickListener(ViewOnClickListener);

shuffleBtn.setOnClickListener(ViewOnClickListener);

nextBtn.setOnClickListener(ViewOnClickListener);

searchBtn.setOnClickListener(ViewOnClickListener);

queueBtn.setOnClickListener(ViewOnClickListener);

music_progressBar.setOnSeekBarChangeListener(new SeekBarChangeListener());

}

/**

在OnResume中初始化和接收Activity数据

@Override

protected void onResume() {

super.onResume();

Intent intent = getIntent();

Bundle bundle = intent.getExtras();

title = bundle.getString(“title”);

artist = bundle.getString(“artist”);

url = bundle.getString(“url”);

listPosition = bundle.getInt(“listPosition”);

repeatState = bundle.getInt(“repeatState”);

isShuffle = bundle.getBoolean(“shuffleState”);

flag = bundle.getInt(“MSG”);

currentTime = bundle.getInt(“currentTime”);

duration = bundle.getInt(“duration”);

initView();

}

/**

初始化界面

public void initView() {

musicTitle.setText(title);

musicArtist.setText(artist);

music_progressBar.setProgress(currentTime);

music_progressBar.setMax(duration);

switch (repeatState) {

case isCurrentRepeat: // 单曲循环

shuffleBtn.setClickable(false);

repeatBtn.setBackgroundResource(R.drawable.repeat_current_selector);

break;

case isAllRepeat: // 全部循环

shuffleBtn.setClickable(false);

repeatBtn.setBackgroundResource(R.drawable.repeat_all_selector);

break;

case isNoneRepeat: // 无重复

shuffleBtn.setClickable(true);

repeatBtn.setBackgroundResource(R.drawable.repeat_none_selector);

break;

}

if(isShuffle) {

isNoneShuffle = false;

shuffleBtn.setBackgroundResource(R.drawable.shuffle_selector);

repeatBtn.setClickable(false);

} else {

isNoneShuffle = true;

shuffleBtn.setBackgroundResource(R.drawable.shuffle_none_selector);

repeatBtn.setClickable(true);

}

if(flag == AppConstant.PlayerMsg.PLAYING_MSG) { //如果播放信息是正在播放

Toast.makeText(PlayerActivity.this, “正在播放–” + title, 1).show();

}

else if(flag == AppConstant.PlayerMsg.PLAY_MSG) { //如果是点击列表播放歌曲的话

play();

}

playBtn.setBackgroundResource(R.drawable.play_selector);

isPlaying = true;

isPause = false;

}

/**

反注册广播

@Override

protected void onStop() {

super.onStop();

unregisterReceiver(playerReceiver);

}

@Override

protected void onDestroy() {

super.onDestroy();

}

/**

控件点击事件
@author wwj

private class ViewOnclickListener implements OnClickListener {

Intent intent = new Intent();

@Override

public void onClick(View v) {

switch(v.getId()) {

case R.id.play_music:

if (isPlaying) {

playBtn.setBackgroundResource(R.drawable.pause_selector);

intent.setAction(“com.wwj.media.MUSIC_SERVICE”);

intent.putExtra(“MSG”, AppConstant.PlayerMsg.PAUSE_MSG);

startService(intent);

isPlaying = false;

isPause = true;

} else if (isPause) {

playBtn.setBackgroundResource(R.drawable.play_selector);

intent.setAction(“com.wwj.media.MUSIC_SERVICE”);

intent.putExtra(“MSG”, AppConstant.PlayerMsg.CONTINUE_MSG);

startService(intent);

isPause = false;

isPlaying = true;

}

break;

case R.id.previous_music: //上一首歌曲

previous_music();

break;

case R.id.next_music: //下一首歌曲

next_music();

break;

case R.id.repeat_music: //重复播放音乐

if (repeatState == isNoneRepeat) {

repeat_one();

shuffleBtn.setClickable(false); //是随机播放变为不可点击状态

repeatState = isCurrentRepeat;

} else if (repeatState == isCurrentRepeat) {

repeat_all();

shuffleBtn.setClickable(false);

repeatState = isAllRepeat;

} else if (repeatState == isAllRepeat) {

repeat_none();

shuffleBtn.setClickable(true);

repeatState = isNoneRepeat;

}

Intent intent = new Intent(REPEAT_ACTION);

switch (repeatState) {

case isCurrentRepeat: // 单曲循环

repeatBtn

.setBackgroundResource(R.drawable.repeat_current_selector);

Toast.makeText(PlayerActivity.this, R.string.repeat_current,

Toast.LENGTH_SHORT).show();

intent.putExtra(“repeatState”, isCurrentRepeat);

sendBroadcast(intent);

break;

case isAllRepeat: // 全部循环

repeatBtn

.setBackgroundResource(R.drawable.repeat_all_selector);

Toast.makeText(PlayerActivity.this, R.string.repeat_all,

Toast.LENGTH_SHORT).show();

intent.putExtra(“repeatState”, isAllRepeat);

sendBroadcast(intent);

break;

case isNoneRepeat: // 无重复

repeatBtn

.setBackgroundResource(R.drawable.repeat_none_selector);

Toast.makeText(PlayerActivity.this, R.string.repeat_none,

Toast.LENGTH_SHORT).show();

intent.putExtra(“repeatState”, isNoneRepeat);

break;

}

break;

case R.id.shuffle_music: //随机播放状态

Intent shuffleIntent = new Intent(SHUFFLE_ACTION);

if (isNoneShuffle) { //如果当前状态为非随机播放，点击按钮之后改变状态为随机播放

shuffleBtn

.setBackgroundResource(R.drawable.shuffle_selector);

Toast.makeText(Player

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Activity.this, R.string.shuffle,

Toast.LENGTH_SHORT).show();

isNoneShuffle = false;

isShuffle = true;

shuffleMusic();

repeatBtn.setClickable(false);

shuffleIntent.putExtra(“shuffleState”, true);

sendBroadcast(shuffleIntent);

} else if (isShuffle) {

shuffleBtn

.setBackgroundResource(R.drawable.shuffle_none_selector);

Toast.makeText(PlayerActivity.this, R.string.shuffle_none,

Toast.LENGTH_SHORT).show();

isShuffle = false;

isNoneShuffle = true;

repeatBtn.setClickable(true);

shuffleIntent.putExtra(“shuffleState”, false);

sendBroadcast(shuffleIntent);

}

break;

}

/**

实现监听Seekbar的类
@author wwj

private class SeekBarChangeListener implements OnSeekBarChangeListener {

@Override

public void onProgressChanged(SeekBar seekBar, int progress,

boolean fromUser) {

if(fromUser) {

audioTrackChange(progress); //用户控制进度的改变

}

@Override

public void onStartTrackingTouch(SeekBar seekBar) {

}

@Override

public void onStopTrackingTouch(SeekBar seekBar) {

}

/**

播放音乐

public void play() {

//开始播放的时候为顺序播放

repeat_none();

Intent intent = new Intent();

intent.setAction(“com.wwj.media.MUSIC_SERVICE”);

intent.putExtra(“url”, url);

intent.putExtra(“listPosition”, listPosition);

intent.putExtra(“MSG”, flag);

startService(intent);

}

/**

随机播放

public void shuffleMusic() {

Intent intent = new Intent(CTL_ACTION);

intent.putExtra(“control”, 4);

sendBroadcast(intent);

}

public void audioTrackChange(int progress) {

Intent intent = new Intent();

intent.setAction(“com.wwj.media.MUSIC_SERVICE”);

intent.putExtra(“url”, url);

intent.putExtra(“listPosition”, listPosition);

if(isPause) {

intent.putExtra(“MSG”, AppConstant.PlayerMsg.PAUSE_MSG);

}

else {

intent.putExtra(“MSG”, AppConstant.PlayerMsg.PROGRESS_CHANGE);

}

intent.putExtra(“progress”, progress);

startService(intent);

}

/**

单曲循环

public void repeat_one() {

Intent intent = new Intent(CTL_ACTION);

intent.putExtra(“control”, 1);

sendBroadcast(intent);

}

/**

全部循环

public void repeat_all() {

Intent intent = new Intent(CTL_ACTION);

intent.putExtra(“control”, 2);

sendBroadcast(intent);

}

/**

顺序播放

public void repeat_none() {

Intent intent = new Intent(CTL_ACTION);

intent.putExtra(“control”, 3);

sendBroadcast(intent);

}

/**

上一首

public void previous_music() {

playBtn.setBackgroundResource(R.drawable.play_selector);

listPosition = listPosition - 1;

if(listPosition >= 0) {

Mp3Info mp3Info = mp3Infos.get(listPosition); //上一首MP3

musicTitle.setText(mp3Info.getTitle());

musicArtist.setText(mp3Info.getArtist());

url = mp3Info.getUrl();

Intent intent = new Intent();

intent.setAction(“com.wwj.media.MUSIC_SERVICE”);

intent.putExtra(“url”, mp3Info.getUrl());

intent.putExtra(“listPosition”, listPosition);

intent.putExtra(“MSG”, AppConstant.PlayerMsg.PRIVIOUS_MSG);

startService(intent);

}

else {

Toast.makeText(PlayerActivity.this, “没有上一首了”, Toast.LENGTH_SHORT).show();

}

/**

下一首

public void next_music() {

playBtn.setBackgroundResource(R.drawable.play_selector);

listPosition = listPosition + 1;

if(listPosition <= mp3Infos.size() - 1) {

Mp3Info mp3Info = mp3Infos.get(listPosition);

url = mp3Info.getUrl();

musicTitle.setText(mp3Info.getTitle());

musicArtist.setText(mp3Info.getArtist());

Intent intent = new Intent();

intent.setAction(“com.wwj.media.MUSIC_SERVICE”);

intent.putExtra(“url”, mp3Info.getUrl());

intent.putExtra(“listPosition”, listPosition);

intent.putExtra(“MSG”, AppConstant.PlayerMsg.NEXT_MSG);

startService(intent);

} else {

Toast.makeText(PlayerActivity.this, “没有下一首了”, Toast.LENGTH_SHORT).show();

}

/**

用来接收从service传回来的广播的内部类
@author wwj

public class PlayerReceiver extends BroadcastReceiver {

@Override

public void onReceive(Context context, Intent intent) {

String action = intent.getAction();

if(action.equals(MUSIC_CURRENT)) {

currentTime = intent.getIntExtra(“currentTime”, -1);

currentProgress.setText(MediaUtil.formatTime(currentTime));

music_progressBar.setProgress(currentTime);

} else if(action.equals(MUSIC_DURATION)) {

int duration = intent.getIntExtra(“duration”, -1);

music_progressBar.setMax(duration);

finalProgress.setText(MediaUtil.formatTime(duration));

} else if(action.equals(UPDATE_ACTION)) {

//获取Intent中的current消息，current代表当前正在播放的歌曲

listPosition = intent.getIntExtra(“current”, -1);

url = mp3Infos.get(listPosition).getUrl();

if(listPosition >= 0) {

musicTitle.setText(mp3Infos.get(listPosition).getTitle());

musicArtist.setText(mp3Infos.get(listPosition).getArtist());

}

if(listPosition == 0) {

finalProgress.setText(MediaUtil.formatTime(mp3Infos.get(listPosition).getDuration()));