mp3播放器

1、视图

 <LinearLayout 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:orientation="vertical"
     tools:context=".MainActivity" >

     <EditText
         android:id="@+id/et_path"
         android:hint="请输入音频文件"
         android:layout_width="fill_parent"
         android:layout_height="wrap_content"
         android:text="/sdcard/ss.mp3"
         />
     <LinearLayout
         android:layout_width="fill_parent"
         android:layout_height="wrap_content"
         android:orientation="horizontal"
         >
         <Button
              android:id="@+id/bt_play"
              android:layout_weight="1"
              android:layout_width="0dip"
              android:layout_height="wrap_content"
              android:text="播放"
             />
          <Button
               android:id="@+id/bt_pause"
              android:layout_weight="1"
              android:layout_width="0dip"
              android:layout_height="wrap_content"
              android:text="暂停"
             />
           <Button
               android:id="@+id/bt_replay"
              android:layout_weight="1"
              android:layout_width="0dip"
              android:layout_height="wrap_content"
              android:text="重播"
             />
            <Button
               android:id="@+id/bt_stop"
              android:layout_weight="1"
              android:layout_width="0dip"
              android:layout_height="wrap_content"
              android:text="停止"
             />

     </LinearLayout>

 </LinearLayout>

3、播放java代码

 package com.example.mp3player;

 import java.io.File;
 import java.io.IOException;

 import android.media.AudioManager;
 import android.media.MediaPlayer;
 import android.media.MediaPlayer.OnCompletionListener;
 import android.os.Bundle;
 import android.app.Activity;
 import android.view.Menu;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.widget.Button;
 import android.widget.EditText;
 import android.widget.Toast;

 public class MainActivity extends Activity implements OnClickListener {
     private EditText et_path;
     private Button bt_play,bt_pause,bt_replay,bt_stop;
     private MediaPlayer mediaPlayer;
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);

         et_path = (EditText) findViewById(R.id.et_path);
         bt_play = (Button) findViewById(R.id.bt_play);
         bt_pause = (Button) findViewById(R.id.bt_pause);
         bt_replay = (Button) findViewById(R.id.bt_replay);
         bt_stop = (Button) findViewById(R.id.bt_stop);

         bt_play.setOnClickListener(this);
         bt_pause.setOnClickListener(this);
         bt_replay.setOnClickListener(this);
         bt_stop.setOnClickListener(this);

     }

     @Override
     public void onClick(View v) {
         switch(v.getId()){
         case R.id.bt_play:
             play();
             break;
         case R.id.bt_pause:
             pause();
             break;
         case R.id.bt_replay:
             replay();
             break;
         case R.id.bt_stop:
             stop();
             break;
         }

     }

     //暂停
     private void pause() {
         if("继续".equals(bt_pause.getText().toString().trim())){
             mediaPlayer.start();
             bt_pause.setText("暂停");
             return;
         }
         if(mediaPlayer != null && mediaPlayer.isPlaying()){
             mediaPlayer.pause();//暂停
             bt_pause.setText("继续");
             return;
         }

     }

     //重播
     private void replay() {
         if(mediaPlayer != null && mediaPlayer.isPlaying()){
             mediaPlayer.seekTo(0);//把进度调为0
             return;
         }
         play();

     }

     //停止播放音乐
     private void stop() {
         // TODO Auto-generated method stub
         if(mediaPlayer != null && mediaPlayer.isPlaying()){
             mediaPlayer.stop();
             mediaPlayer.release();
             mediaPlayer = null;
             bt_play.setEnabled(true);
         }
     }

     private void play(){
         String path = et_path.getText().toString().trim();
         File file = new File(path);
         if(file.exists() && file.length() > 0){
             try {
                 mediaPlayer = new MediaPlayer();
                 mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);//设置音频流类型
                 mediaPlayer.setDataSource(path);//设置音频源
                 mediaPlayer.prepare();
                 mediaPlayer.start();
                 //监听是否播放完
                 mediaPlayer.setOnCompletionListener(new OnCompletionListener() {

                     @Override
                     public void onCompletion(MediaPlayer mp) {
                         // TODO Auto-generated method stub
                         bt_play.setEnabled(true);

                     }
                 });
                 bt_play.setEnabled(false);//设置为不可用
             } catch (Exception e) {
                 // TODO Auto-generated catch block
                 Toast.makeText(this, "播放失败!", 0).show();
                 e.printStackTrace();
             }
         }else{
             Toast.makeText(this, "音频文件不存在!", 0).show();
         }
     }

 }