Android利用SeekBar实现简单音乐播放器

2024-02-20 19:00:04 54

一.Demo简介

利用AIDL为Activity绑定服务，利用Handler机制，发送消息更新SeekBar的UI，利用计时器定时更新SeekBar的进度。实现对音乐的开始播放，到暂停，继续，以及停止播放的功能。以及实现拖动进度条播放音乐的功能。

二.AIDL接口

利用AIDL机制提供给MainActivity访问MyMusicService的方法，实现播放暂停等功能。

三.主要类代码

1.MyMusicService

packagemy.com.mymusicp;

importandroid.app.Service;
importandroid.content.Intent;
importandroid.media.MediaPlayer;
importandroid.os.Bundle;
importandroid.os.IBinder;
importandroid.os.Message;
importandroid.os.RemoteException;
importandroid.support.annotation.Nullable;
importandroid.util.Log;

importjava.io.IOException;
importjava.util.Timer;
importjava.util.TimerTask;

/**
*Createdbyc_ljfon16-12-26.
*/
publicclassMyMusicServiceextendsService{
privateStringtag="MyMusicService";
privateMediaPlayermediaPlayer;

@Override
publicvoidonCreate(){
super.onCreate();
mediaPlayer=newMediaPlayer();
}

@Nullable
@Override
publicIBinderonBind(Intentintent){
returnnewMyMusicBinder();
}
classMyMusicBinderextendsIMyMusicService.Stub{

@Override
publicvoidplay()throwsRemoteException{
playmusic();
}

@Override
publicvoidpause()throwsRemoteException{
pausemusic();
}

@Override
publicvoidstop()throwsRemoteException{
stopmusic();
}

@Override
publicvoidcontinuePlay()throwsRemoteException{
rePlayMusic();
}

@Override
publicvoidseekPlayProgress(intposition)throwsRemoteException{
seekPlayPositiom(position);
}

}
//播放音乐
publicvoidplaymusic(){
mediaPlayer.reset();
Stringurl="sdcard/Music/Fade.mp3";
Log.i(tag,url);
try{
mediaPlayer.setDataSource(url);
mediaPlayer.prepare();
}catch(IOExceptione){
e.printStackTrace();
}
//mighttakelong!(forbuffering,etc)
mediaPlayer.start();
//更新播放进度条
seekPlayProgress();
}
publicvoidpausemusic(){
mediaPlayer.pause();
Log.i(tag,"暂停播放");

}

publicvoidstopmusic(){
mediaPlayer.reset();
Log.i(tag,"停止播放");
mediaPlayer.stop();
}

@Override
publicvoidonDestroy(){
super.onDestroy();
}
publicvoidseekPlayPositiom(intpositon){
Log.i(tag,"设置播放位置");
mediaPlayer.seekTo(positon);
}


publicvoidseekPlayProgress(){
/*1.获取当前歌曲的总时长*/
finalintduration=mediaPlayer.getDuration();

//计时器对象
finalTimertimer=newTimer();
finalTimerTasktask=newTimerTask(){
@Override
publicvoidrun(){
//开启线程定时获取当前播放进度
intcurrentposition=mediaPlayer.getCurrentPosition();
//利用message给主线程发消息更新seekbar进度
Messagems=Message.obtain();
Bundlebundle=newBundle();
bundle.putInt("duration",duration);
Log.i(tag,"歌曲总长度"+duration);
bundle.putInt("currentposition",currentposition);
Log.i(tag,"当前长度"+currentposition);
//设置发送的消息内容
ms.setData(bundle);
//发送消息
MainActivity.handler.sendMessage(ms);
}
};
timer.schedule(task,300,500);
//当播放结束时停止播放
mediaPlayer.setOnCompletionListener(newMediaPlayer.OnCompletionListener(){
@Override
publicvoidonCompletion(MediaPlayermp){
Log.i(tag,"取消计时任务");
timer.cancel();
task.cancel();
}
});

}
publicvoidrePlayMusic(){
Log.i(tag,"继续播放音乐");
mediaPlayer.start();
}
}

2.Mainactivity

packagemy.com.mymusicp;

importandroid.Manifest;
importandroid.app.Activity;
importandroid.content.ComponentName;
importandroid.content.Intent;
importandroid.content.ServiceConnection;
importandroid.content.pm.PackageManager;
importandroid.os.Bundle;
importandroid.os.Handler;
importandroid.os.IBinder;
importandroid.os.Message;
importandroid.os.RemoteException;
importandroid.support.v4.app.ActivityCompat;
importandroid.support.v7.app.AppCompatActivity;
importandroid.view.View;
importandroid.widget.Button;
importandroid.widget.SeekBar;

publicclassMainActivityextendsAppCompatActivity{
privateIMyMusicServiceiMyMusicService;
privatestaticSeekBarseekBar;
privateButtonbtpause_play;
privatebooleanb=true;//判断暂停和继续播放
publicstaticHandlerhandler=newHandler(){
@Override
publicvoidhandleMessage(Messagemsg){
//处理消息
Bundlebundle=msg.getData();
//获取歌曲长度和当前播放位置，并设置到进度条上
intduration=bundle.getInt("duration");
intcurrentposition=bundle.getInt("currentposition");
seekBar.setMax(duration);
seekBar.setProgress(currentposition);
}
};

@Override
protectedvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
verifyStoragePermissions(MainActivity.this);
//获取播放暂停按钮
btpause_play=(Button)findViewById(R.id.bt_pause);
Intentintent=newIntent(MainActivity.this,MyMusicService.class);
bindService(intent,newMyConn(),BIND_AUTO_CREATE);
seekBar=(SeekBar)findViewById(R.id.seekBar);
seekBar.setOnSeekBarChangeListener(newSeekBar.OnSeekBarChangeListener(){
@Override
publicvoidonProgressChanged(SeekBarseekBar,intprogress,booleanfromUser){
}
@Override
publicvoidonStartTrackingTouch(SeekBarseekBar){
}
@Override
publicvoidonStopTrackingTouch(SeekBarseekBar){
try{
iMyMusicService.seekPlayProgress(seekBar.getProgress());
}catch(RemoteExceptione){
e.printStackTrace();
}
}
});
}
//定义服务连接类
classMyConnimplementsServiceConnection{

@Override
publicvoidonServiceConnected(ComponentNamename,IBinderservice){
iMyMusicService=IMyMusicService.Stub.asInterface(service);
}
@Override
publicvoidonServiceDisconnected(ComponentNamename){

}
}
publicvoidplay(Viewv){
try{
iMyMusicService.play();

}catch(RemoteExceptione){
e.printStackTrace();
}
}

publicvoidpause(Viewv){
try{
if(b)
{
iMyMusicService.pause();
b=false;
btpause_play.setText("继续播放");
}
else{
b=true;
iMyMusicService.continuePlay();
btpause_play.setText("暂停播放");

}

}catch(RemoteExceptione){
e.printStackTrace();
}
}

publicvoidstop(Viewv){
try{
iMyMusicService.stop();
}catch(RemoteExceptione){
e.printStackTrace();
}
}
//StoragePermissions
privatestaticfinalintREQUEST_EXTERNAL_STORAGE=1;
privatestaticString[]PERMISSIONS_STORAGE={
Manifest.permission.READ_EXTERNAL_STORAGE,
Manifest.permission.WRITE_EXTERNAL_STORAGE,
};

/**
*Checksiftheapphaspermissiontowritetodevicestorage
*
*Iftheappdoesnothaspermissionthentheuserwillbepromptedtograntpermissions
*
*@paramactivity
*/
publicstaticvoidverifyStoragePermissions(Activityactivity){
//Checkifwehavewritepermission
intpermission=ActivityCompat.checkSelfPermission(activity,Manifest.permission.WRITE_EXTERNAL_STORAGE);

if(permission!=PackageManager.PERMISSION_GRANTED){
//Wedon'thavepermissionsoprompttheuser
ActivityCompat.requestPermissions(
activity,
PERMISSIONS_STORAGE,
REQUEST_EXTERNAL_STORAGE
);
}
}
}

四.布局文件

五.注册服务

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Android利用SeekBar实现简单音乐播放器

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