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
package my.com.mymusicp;
import android.app.Service;
import android.content.Intent;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.os.IBinder;
import android.os.Message;
import android.os.RemoteException;
import android.support.annotation.Nullable;
import android.util.Log;
import java.io.IOException;
import java.util.Timer;
import java.util.TimerTask;
/**
* Created by c_ljf on 16-12-26.
*/
public class MyMusicService extends Service {
private String tag="MyMusicService";
private MediaPlayer mediaPlayer;
@Override
public void onCreate() {
super.onCreate();
mediaPlayer = new MediaPlayer();
}
@Nullable
@Override
public IBinder onBind(Intent intent) {
return new MyMusicBinder();
}
class MyMusicBinder extends IMyMusicService.Stub{
@Override
public void play() throws RemoteException {
playmusic();
}
@Override
public void pause() throws RemoteException {
pausemusic();
}
@Override
public void stop() throws RemoteException {
stopmusic();
}
@Override
public void continuePlay() throws RemoteException {
rePlayMusic();
}
@Override
public void seekPlayProgress(int position) throws RemoteException {
seekPlayPositiom(position);
}
}
//播放音乐
public void playmusic(){
mediaPlayer.reset();
String url = "sdcard/Music/Fade.mp3";
Log.i(tag,url);
try {
mediaPlayer.setDataSource(url);
mediaPlayer.prepare();
} catch (IOException e) {
e.printStackTrace();
}
// might take long! (for buffering, etc)
mediaPlayer.start();
//更新播放进度条
seekPlayProgress();
}
public void pausemusic(){
mediaPlayer.pause();
Log.i(tag,"暂停播放");
}
public void stopmusic(){
mediaPlayer.reset();
Log.i(tag,"停止播放");
mediaPlayer.stop();
}
@Override
public void onDestroy() {
super.onDestroy();
}
public void seekPlayPositiom(int positon){
Log.i(tag,"设置播放位置");
mediaPlayer.seekTo(positon);
}
public void seekPlayProgress(){
/*1.获取当前歌曲的总时长*/
final int duration=mediaPlayer.getDuration();
//计时器对象
final Timer timer=new Timer();
final TimerTask task=new TimerTask() {
@Override
public void run() {
//开启线程定时获取当前播放进度
int currentposition=mediaPlayer.getCurrentPosition();
//利用message给主线程发消息更新seekbar进度
Message ms=Message.obtain();
Bundle bundle=new Bundle();
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(new MediaPlayer.OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer mp) {
Log.i(tag,"取消计时任务");
timer.cancel();
task.cancel();
}
});
}
public void rePlayMusic() {
Log.i(tag, "继续播放音乐");
mediaPlayer.start();
}
}
2.Mainactivity
package my.com.mymusicp;
import android.Manifest;
import android.app.Activity;
import android.content.ComponentName;
import android.content.Intent;
import android.content.ServiceConnection;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.os.Handler;
import android.os.IBinder;
import android.os.Message;
import android.os.RemoteException;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.SeekBar;
public class MainActivity extends AppCompatActivity {
private IMyMusicService iMyMusicService;
private static SeekBar seekBar;
private Button btpause_play;
private boolean b=true;//判断暂停和继续播放
public static Handler handler=new Handler(){
@Override
public void handleMessage(Message msg) {
//处理消息
Bundle bundle=msg.getData();
//获取歌曲长度和当前播放位置，并设置到进度条上
int duration=bundle.getInt("duration");
int currentposition=bundle.getInt("currentposition");
seekBar.setMax(duration);
seekBar.setProgress(currentposition);
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
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);
Intent intent=new Intent(MainActivity.this,MyMusicService.class);
bindService(intent,new MyConn(),BIND_AUTO_CREATE);
seekBar=(SeekBar) findViewById(R.id.seekBar);
seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
try {
iMyMusicService.seekPlayProgress(seekBar.getProgress());
} catch (RemoteException e) {
e.printStackTrace();
}
}
});
}
//定义服务连接类
class MyConn implements ServiceConnection{
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
iMyMusicService=IMyMusicService.Stub.asInterface(service);
}
@Override
public void onServiceDisconnected(ComponentName name) {
}
}
public void play(View v){
try {
iMyMusicService.play();
} catch (RemoteException e) {
e.printStackTrace();
}
}
public void pause(View v){
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 (RemoteException e) {
e.printStackTrace();
}
}
public void stop(View v){
try {
iMyMusicService.stop();
} catch (RemoteException e) {
e.printStackTrace();
}
}
// Storage Permissions
private static final int REQUEST_EXTERNAL_STORAGE = 1;
private static String[] PERMISSIONS_STORAGE = {
Manifest.permission.READ_EXTERNAL_STORAGE,
Manifest.permission.WRITE_EXTERNAL_STORAGE,
};
/**
* Checks if the app has permission to write to device storage
*
* If the app does not has permission then the user will be prompted to grant permissions
*
* @param activity
*/
public static void verifyStoragePermissions(Activity activity) {
// Check if we have write permission
int permission = ActivityCompat.checkSelfPermission(activity, Manifest.permission.WRITE_EXTERNAL_STORAGE);
if (permission != PackageManager.PERMISSION_GRANTED) {
// We don't have permission so prompt the user
ActivityCompat.requestPermissions(
activity,
PERMISSIONS_STORAGE,
REQUEST_EXTERNAL_STORAGE
);
}
}
}
四.布局文件
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
tools:context="my.com.mymusicp.MainActivity">
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:id="@+id/linearLayout">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="开始播放"
android:onClick="play"
android:id="@+id/bt_start"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="暂停播放"
android:layout_weight="1"
android:onClick="pause"
android:id="@+id/bt_pause"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="停止播放"
android:onClick="stop"
android:id="@+id/bt_stop"/>
</LinearLayout>
<SeekBar
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/seekBar"
android:layout_below="@+id/linearLayout"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"/>
</RelativeLayout>
五.注册服务
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="my.com.mymusicp">
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
<service android:name=".MyMusicService"/>
</application>
</manifest>
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持找一找教程网。
