Android简易音乐播放器实现代码

package com.thm.g150820_android26_playmusic;import Android.media.MediaPlayer; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.ImageButton; import android.widget.SeekBar;public class MainActivity extends AppCompatActivity {private MediaPlayer mediaPlayer; private SeekBar seekBar;@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); 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) {  //获取拖动结束之后的位置  int progress = seekBar.getProgress();  //跳转到某个位置播放  mediaPlayer.seekTo(progress); }});}public void isPlayOrPause(View view){ //把View强转为ImageButton ImageButton imageButton = (ImageButton) view;if(mediaPlayer==null) { //实例化MediaPlayer mediaPlayer = MediaPlayer.create(this, R.raw.yao); //开始播放 mediaPlayer.start(); //图标修改为暂停的图标 imageButton.setImageResource(android.R.drawable.ic_media_pause); //获取音乐的总时长 int duration = mediaPlayer.getDuration(); //设置进度条的最大值为音乐的总时长 seekBar.setMax(duration); new MyThre().start();}//判断如果音乐在播放else if(mediaPlayer.isPlaying()){ //就暂停音乐 mediaPlayer.pause(); //图标修改为播放的图标 imageButton.setImageResource(android.R.drawable.ic_media_play);}else{ mediaPlayer.start(); //图标修改为暂停的图标 imageButton.setImageResource(android.R.drawable.ic_media_pause);}}//写内部类 class MyThre extends Thread{ @Override public void run() { super.run(); while(seekBar.getProgress()<=seekBar.getMax()){  //获取当前音乐播放的位置  int currentPosition = mediaPlayer.getCurrentPosition();  //让进度条动起来  seekBar.setProgress(currentPosition);  } }}}

package com.thm.g150820_android26_playmusic;import android.media.AudioManager;import android.media.MediaPlayer;import android.net.Uri;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.ImageButton;import android.widget.SeekBar;import java.io.IOException;public class MainActivity extends AppCompatActivity { private MediaPlayer mediaPlayer; private SeekBar seekBar; @Override protected void onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  setContentView(R.layout.activity_main);  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) {    //获取拖动结束之后的位置    int progress = seekBar.getProgress();    //跳转到某个位置播放    mediaPlayer.seekTo(progress);   }  }); } public void isPlayOrPause(View view){  //把View强转为ImageButton  ImageButton imageButton = (ImageButton) view;  if(mediaPlayer==null) {   //实例化MediaPlayer   //播放应用内的音乐   //mediaPlayer = MediaPlayer.create(this, R.raw.yao);   //播放内存卡中的音乐   mediaPlayer = new MediaPlayer();   //设置类型   mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);   //设置音乐路径   try {    mediaPlayer.setDataSource(this, Uri.parse("storage/sdcard0/Music/a.mp3"));    //播放之前准备一下    mediaPlayer.prepare();   } catch (IOException e) {    e.printStackTrace();   }   //开始播放   mediaPlayer.start();   //图标修改为暂停的图标   imageButton.setImageResource(android.R.drawable.ic_media_pause);   //获取音乐的总时长   int duration = mediaPlayer.getDuration();   //设置进度条的最大值为音乐的总时长   seekBar.setMax(duration);   new MyThre().start();  }//判断如果音乐在播放  else if(mediaPlayer.isPlaying()){   //就暂停音乐   mediaPlayer.pause();   //图标修改为播放的图标   imageButton.setImageResource(android.R.drawable.ic_media_play);  }else{   mediaPlayer.start();   //图标修改为暂停的图标   imageButton.setImageResource(android.R.drawable.ic_media_pause);  } } //写线程内部类 class MyThre extends Thread{  @Override  public void run() {   super.run();   while(seekBar.getProgress()<=seekBar.getMax()){    //获取当前音乐播放的位置    int currentPosition = mediaPlayer.getCurrentPosition();    //让进度条动起来    seekBar.setProgress(currentPosition);   }  } }}