android实现音乐播放器

package com.example.www.musicdemo;import android.Manifest;import android.content.ComponentName;import android.content.Intent;import android.content.ServiceConnection;import android.media.MediaPlayer;import android.os.Handler;import android.os.IBinder;import android.os.Message;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.SeekBar;import java.io.IOException;public class MainActivity extends AppCompatActivity { private Iservice mIservice; private static SeekBar mSeekBar; public static Handler mHandler = new Handler() {  @Override  public void handleMessage(Message msg) {   //获取我们携带的数据   Bundle data = msg.getData();   //获取歌曲的总时长 和 当前进度   int duration = data.getInt("duration");   int currentPosition = data.getInt("currentPosition");   mSeekBar.setMax(duration);   mSeekBar.setProgress(currentPosition);  } }; @Override protected void onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  setContentView(R.layout.activity_main);//  requestPermissions(new String[]{Manifest.permission.INTERNET}, 100);  mSeekBar = (SeekBar) findViewById(R.id.seekBar);  Intent intent = new Intent(this, MyService.class);  startService(intent);  bindService(intent, conn, BIND_AUTO_CREATE);  // 设置seekbar的拖动时间监听  mSeekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {   @Override   public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {    mIservice.callSeekTo(seekBar.getProgress());   }   @Override   public void onStartTrackingTouch(SeekBar seekBar) {   }   @Override   public void onStopTrackingTouch(SeekBar seekBar) {   }  }); } public void playmusic(View view) {  mIservice.callPlayMusic(); } public void onPause(View view) {  mIservice.callPauseMusic(); } public void stopMusci(View view) {  mIservice.stopMusic(); } public void replaymusic(View view) {  mIservice.callRePlayMusic(); } ServiceConnection conn = new ServiceConnection() {  @Override  public void onServiceConnected(ComponentName name, IBinder service) {   mIservice = (Iservice) service;  }  @Override  public void onServiceDisconnected(ComponentName name) {  } }; @Override protected void onDestroy() {  unbindService(conn);  super.onDestroy(); }}

package com.example.www.musicdemo;import android.app.Service;import android.content.Intent;import android.media.MediaPlayer;import android.os.Binder;import android.os.Bundle;import android.os.IBinder;import android.os.Message;import java.util.Timer;import java.util.TimerTask;public class MyService extends Service { private MediaPlayer mMp; public MyService() { } @Override public IBinder onBind(Intent intent) {  // TODO: Return the communication channel to the service.  return new MyBinder(); } @Override public void onCreate() {  mMp = new MediaPlayer();  super.onCreate(); } @Override public void onDestroy() {  super.onDestroy(); } public void playMusic(){  try {   mMp.setDataSource("/resource/n1/77/39/2163816420.mp3");   mMp.prepare();   mMp.start();   updateSeekBar();  } catch (Exception e) {   e.printStackTrace();  } } public void pauseMusic(){  mMp.pause(); } public void stopMusic(){  mMp.stop(); } public void updateSeekBar(){  final int duration = mMp.getDuration();  final Timer timer = new Timer();  final TimerTask timerTask = new TimerTask() {   @Override   public void run() {    int currentPosition = mMp.getCurrentPosition();    Message msg = Message.obtain();    Bundle bundle = new Bundle(); // map    bundle.putInt("duration", duration);    bundle.putInt("currentPosition", currentPosition);    msg.setData(bundle);    MainActivity.mHandler.sendMessage(msg);   }  };  timer.schedule(timerTask, 100, 1000);  // 监听音乐播放完毕  mMp.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {   @Override   public void onCompletion(MediaPlayer mp) {    System.out.println("歌曲播放完成了");    timer.cancel();    timerTask.cancel();   }  }); } //实现指定播放的位置 public void seekTo(int position){  mMp.seekTo(position); } private class MyBinder extends Binder implements Iservice{  @Override  public void callPlayMusic() {   playMusic();  }  @Override  public void callPauseMusic() {   pauseMusic();  }  @Override  public void callRePlayMusic() {   mMp.start();  }  @Override  public void stopMusic() {   MyService.this.stopMusic();  }  @Override  public void callSeekTo(int position) {   seekTo(position);  } }}

package com.example.www.musicdemo;/** * @author Administrator * @name mutilMedia * @class name：com.example.www.musicdemo * @class describe * @time 2019/4/8 11:23 * @change * @chang time * @class describe */public interface Iservice { //把想暴露的方法都定义在接口中 public void callPlayMusic(); public void callPauseMusic(); public void callRePlayMusic(); public void stopMusic(); public void callSeekTo(int position);}

<?xml version="1.0" encoding="utf-8"?><android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" 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"> <Button  android:id="@+id/button"  android:layout_width="wrap_content"  android:layout_height="wrap_content"  android:layout_marginStart="8dp"  android:layout_marginTop="8dp"  android:onClick="playmusic"  android:text="播放"  app:layout_constraintEnd_toStartOf="@+id/button2"  app:layout_constraintHorizontal_bias="0.5"  app:layout_constraintStart_toStartOf="parent"  app:layout_constraintTop_toTopOf="parent" /> <Button  android:id="@+id/button2"  android:layout_width="wrap_content"  android:layout_height="wrap_content"  android:text="暂停"  app:layout_constraintEnd_toStartOf="@+id/button3"  app:layout_constraintHorizontal_bias="0.5"  app:layout_constraintStart_toEndOf="@+id/button"  app:layout_constraintTop_toTopOf="@+id/button"  android:onClick="onPause"/> <Button  android:id="@+id/button3"  android:layout_width="wrap_content"  android:layout_height="wrap_content"  android:text="重新播放"  app:layout_constraintEnd_toStartOf="@+id/button4"  app:layout_constraintHorizontal_bias="0.5"  app:layout_constraintStart_toEndOf="@+id/button2"  app:layout_constraintTop_toTopOf="@+id/button2"  android:onClick="replaymusic"/> <Button  android:id="@+id/button4"  android:layout_width="wrap_content"  android:layout_height="wrap_content"  android:text="停止播放"  app:layout_constraintEnd_toEndOf="parent"  app:layout_constraintHorizontal_bias="0.5"  app:layout_constraintStart_toEndOf="@+id/button3"  app:layout_constraintTop_toTopOf="@+id/button3"  android:onClick="stopMusci"/> <SeekBar  android:id="@+id/seekBar"  android:layout_width="0dp"  android:layout_height="wrap_content"  android:layout_marginStart="8dp"  android:layout_marginTop="32dp"  android:layout_marginEnd="8dp"  app:layout_constraintEnd_toEndOf="parent"  app:layout_constraintHorizontal_bias="1.0"  app:layout_constraintStart_toStartOf="parent"  app:layout_constraintTop_toBottomOf="@+id/button2" /></android.support.constraint.ConstraintLayout>AndroidManifest.xml<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.www.musicdemo"> <uses-permission android:name="android.permission.INTERNET" /> <application  android:allowBackup="true"  android:icon="@mipmap/ic_launcher"  android:label="@string/app_name"  android:roundIcon="@mipmap/ic_launcher_round"  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=".MyService"   android:enabled="true"   android:exported="true"></service> </application></manifest>