android实现音乐播放器

需求描述： 拥有播放，暂停，重新播放和停止等功能。 并且随着音乐的进度，进图条会自动更新。手动拖动进度条也会更新音乐的进度。

效果展示

示例代码

mainactivity

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();
 }
}

myservice

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);
  }

 }
}

iservice

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);
}

activity_main.xml

<?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>

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