使用多媒體播放器(MediaPlayer)播放MP3音樂

Android的多媒體播放器(MediaPlayer)類可以用來控制播放的音頻/視頻文件和流(Stream).



首先, mp3文件複製到/res/raw夾, 名為sample.mp3.

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   android:orientation="vertical"
   android:layout_width="fill_parent"
   android:layout_height="fill_parent"
   >
<TextView 
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   android:text="@string/hello"
   />
<Button
   android:id="@+id/play"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   android:text="Play"
   />
<Button
   android:id="@+id/continueplay"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   android:text="Continue Play"
   />
<Button
   android:id="@+id/pause"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   android:text="Pause"
   />
<Button
   android:id="@+id/stop"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   android:text="Stop"
   />
<TextView
   android:id="@+id/state"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   />
</LinearLayout>

AndroidMediaPlayer.java

package com.AndroidMediaPlayer;

import android.app.Activity;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class AndroidMediaPlayer extends Activity {

   private Button buttonPlay, buttonContinuePlay, buttonPause, buttonStop;
   private TextView textState;
   private MediaPlayer mediaPlayer;

   /** Called when the activity is first created. */
   @Override
   public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.main);
       buttonPlay = (Button)findViewById(R.id.play);
       buttonContinuePlay = (Button)findViewById(R.id.continueplay);
       buttonPause = (Button)findViewById(R.id.pause);
       buttonStop = (Button)findViewById(R.id.stop);
       textState = (TextView)findViewById(R.id.state);
      
       mediaPlayer = new MediaPlayer();
      
       buttonPlay.setOnClickListener(buttonPlayOnClickListener);
       buttonContinuePlay.setOnClickListener(buttonContinuePlayOnClickListener);
       buttonPause.setOnClickListener(buttonPauseOnClickListener);
       buttonStop.setOnClickListener(buttonStopOnClickListener);
      
       textState.setText("- idle -");
       buttonPlay.setEnabled(true);
       buttonContinuePlay.setEnabled(false);
       buttonPause.setEnabled(false);
       buttonStop.setEnabled(false);
      
   }
  
   Button.OnClickListener buttonPlayOnClickListener
    = new Button.OnClickListener(){

  @Override
  public void onClick(View v) {
   // TODO Auto-generated method stub
  
    mediaPlayer = MediaPlayer.create(AndroidMediaPlayer.this, R.raw.sample);
    try {
     mediaPlayer.start();
     textState.setText("- Playing -");
     buttonPlay.setEnabled(false);
     buttonContinuePlay.setEnabled(false);
           buttonPause.setEnabled(true);
           buttonStop.setEnabled(true);
    } catch (IllegalStateException e) {
     // TODO Auto-generated catch block
     e.printStackTrace();
    }
  }
   
   };
  
   Button.OnClickListener buttonContinuePlayOnClickListener
 = new Button.OnClickListener(){

 @Override
 public void onClick(View v) {
  // TODO Auto-generated method stub
 
   try {
    mediaPlayer.start();
    textState.setText("- Playing -");
    buttonPlay.setEnabled(false);
    buttonContinuePlay.setEnabled(false);
          buttonPause.setEnabled(true);
          buttonStop.setEnabled(true);
   } catch (IllegalStateException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   }
 }

   };
  
   Button.OnClickListener buttonPauseOnClickListener
 = new Button.OnClickListener(){

  @Override
  public void onClick(View v) {
   // TODO Auto-generated method stub

    try {
     mediaPlayer.pause();
     textState.setText("- Pause -");
     buttonPlay.setEnabled(true);
     buttonContinuePlay.setEnabled(true);
           buttonPause.setEnabled(false);
           buttonStop.setEnabled(true);
    } catch (IllegalStateException e) {
     // TODO Auto-generated catch block
     e.printStackTrace();
    }
  }

   };
  
   Button.OnClickListener buttonStopOnClickListener
 = new Button.OnClickListener(){

  @Override
  public void onClick(View v) {
   // TODO Auto-generated method stub

    try {
     mediaPlayer.stop();
     textState.setText("- Stop -");
     buttonPlay.setEnabled(true);
     buttonContinuePlay.setEnabled(false);
           buttonPause.setEnabled(false);
           buttonStop.setEnabled(false);
    } catch (IllegalStateException e) {
     // TODO Auto-generated catch block
     e.printStackTrace();
    }
  }
   };
}