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>