android服务实现播放器,安卓开发-Service实现音乐播放器
内容纲要
Service实现音乐播放器
用Service+MediaPlayer实现后台播放网络媒体链接，添加seekbar和button实现播放控制
创建Service
public class MusicService extends Service {
//从网易云抓取的播放链接
private String path = "http://m10.music.126.net/20200104135351/794ede970720b02ed8ac726c5dc6936a/ymusic/918c/1958/7d87/022d7d76c923b1caaca6e30ca47d0f69.mp3";
private MediaPlayer player;
public MusicService() {
}
@Override
public IBinder onBind(Intent intent) {
//当执行完了onCreate后，执行onBind把操作歌曲的方法返回，和Activity进行交互
return new MyBinder();
}
@Override
public void onCreate() {
super.onCreate();
//加载本地音乐
//initLocalMusic();
//加载网络音乐
initNetMusic();
}
private void initNetMusic() {
if (player == null){
//如果为空就new我一个
player = new MediaPlayer();
try {
player.setDataSource(path);
// player.prepare();
//异步准备
player.prepareAsync();
//添加监听
// player.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
// @Override
// public void onPrepared(MediaPlayer mp) {
// mp.start();
// }
// });
Log.e("myService","player prepared");
} catch (IOException e) {
Log.e("myService","play failed");
e.printStackTrace();
}
}else {
//判断是否处于播放状态
if (player.isPlaying()){
player.pause();
}else {
player.start();
}
}
}
private void initLocalMusic() {
//这里只执行一次，用于准备播放器
player = new MediaPlayer();
try {
player.setDataSource(path);
//准备资源
player.prepare();
} catch (IOException e) {
e.printStackTrace();
}
Log.e("myService", "准备播放音乐");
}
public class MyBinder extends Binder {
//判断是否处于播放状态
public boolean isPlaying(){
return player.isPlaying();
}
//播放或暂停歌曲
public void play() {
if (player.isPlaying()) {
player.pause();
} else {
player.start();
}
Log.e("myService", "播放音乐");
}
//返回歌曲的长度
public int getDuration(){
return player.getDuration();
}
//返回歌曲目前的进度
public int getCurrenPostion(){
return player.getCurrentPosition();
}
//设置歌曲播放的进度
public void seekTo(int mesc){
player.seekTo(mesc);
}
}
}
Activity添加交互
public class MainActivity extends AppCompatActivity {
private MyConnection conn;
private MusicService.MyBinder musicControl;
private Button btn_play;
private SeekBar seekBar;
//定义状态变量，更新进度条
private static final int UPDATE_PROGRESS = 0;
//主进程创建消息处理器handler定时更新进度条
@SuppressLint("HandlerLeak")
private Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case UPDATE_PROGRESS:
updateProgress();
break;
default:
break;
}
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initService();
}
private void initService() {
btn_play = (Button) findViewById(R.id.btn_play);
seekBar = (SeekBar) findViewById(R.id.sb);
Intent intent_music = new Intent(this, MusicService.class);
conn = new MyConnection();
//使用混合的方法开启服务
startService(intent_music);
bindService(intent_music, conn, BIND_AUTO_CREATE);
seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
//进度条改变
if (fromUser){
musicControl.seekTo(progress);
}
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
//开始触摸进度条
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
//停止触摸进度条
}
});
}
private class MyConnection implements ServiceConnection {
//服务启动完成后会进入到这个方法
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
//获得service中的MyBinder
musicControl = (MusicService.MyBinder) service;
//更新按钮的文字
updatePlayText();
//设置进度条的最大值
seekBar.setMax(musicControl.getDuration());
Log.e("myService","最大值为"+String.valueOf(musicControl.getDuration()));
//设置进度条的进度
seekBar.setProgress(musicControl.getCurrenPostion());
}
@Override
public void onServiceDisconnected(ComponentName name) {
}
}
@Override
protected void onResume() {
super.onResume();
//进入到界面后开始更新进度条
if (musicControl != null){
handler.sendEmptyMessage(UPDATE_PROGRESS);
}
}
@Override
protected void onDestroy() {
super.onDestroy();
//退出应用后与service解除绑定
unbindService(conn);
}
@Override
protected void onStop() {
super.onStop();
//停止更新进度条的进度
handler.removeCallbacksAndMessages(null);
}
//更新进度条
private void updateProgress() {
int currenPostion = musicControl.getCurrenPostion();
// String cp = String.valueOf(currenPostion);
// Log.e("myService","当前播放至"+cp);
//使用Handler每500毫秒更新一次进度条
seekBar.setMax(musicControl.getDuration());
seekBar.setProgress(currenPostion);
handler.sendEmptyMessageDelayed(UPDATE_PROGRESS, 500);
}
//更新按钮的文字
public void updatePlayText() {
if (musicControl.isPlaying()) {
btn_play.setText("暂停");
handler.sendEmptyMessage(UPDATE_PROGRESS);
} else {
btn_play.setText("播放");
}
}
public void mClick(View view) {
//调用MyBinder中的play()方法
switch (view.getId()){
case R.id.btn_play:
musicControl.play();
updatePlayText();
break;
default:
break;
}
}
}
布局文件
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:orientation="vertical">
android:id="@+id/textView3"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center"
android:layout_marginLeft="10dp"
android:layout_marginTop="10dp"
android:layout_marginRight="10dp"
android:layout_marginBottom="10dp"
android:layout_weight="9"
android:text="Service实现音乐播放器"
android:textColor="#FF9800"
android:textSize="24sp"
android:textStyle="italic"
android:typeface="normal"
app:fontFamily="sans-serif-condensed-medium" />
android:id="@+id/imageView2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
app:srcCompat="@drawable/mypic_ad" />
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="8"
android:orientation="vertical">
android:id="@+id/sb"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1" />
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:orientation="horizontal">
android:id="@+id/btn_play"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:onClick="mClick"
android:text="播放" />