Android应用开发揭秘之7.2 播放音乐

 

package lau.com;

 

import java.io.IOException;

 

import android.app.Activity;

import android.media.MediaPlayer;

import android.media.MediaPlayer.OnCompletionListener;

import android.os.Bundle;

import android.view.KeyEvent;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.ImageButton;

import android.widget.TextView;

 

public class AndroidPractice extends Activity {

       /** Called when the activity is first created. */

 

       private TextView mTextView = null;

//     private Button mButton1 = null;

//     private Button mButton2 = null;

//     private Button mButton3 = null;

      

       private boolean bIsPause = false;

       private boolean bIsPlaying = false;

       private boolean bIsRelease = false;

      

       private ImageButton mStartImageButton = null;

       private ImageButton mStopImageButton = null;

       private ImageButton mPauseImageButton = null;

 

       private MediaPlayer mMediaPlayer = null;

      

       public void onCreate(Bundle savedInstanceState) {

              super.onCreate(savedInstanceState);

              setContentView(R.layout.main);

              mTextView = (TextView)findViewById(R.id.tv);

              mStartImageButton = (ImageButton)findViewById(R.id.start_btn);

              mStopImageButton = (ImageButton)findViewById(R.id.stop_btn);

              mPauseImageButton = (ImageButton)findViewById(R.id.pause_btn);

             

             

              mStartImageButton.setOnClickListener(new OnClickListener() {

                    

                     @Override

                     public void onClick(View v) {

                            // TODO Auto-generated method stub

                            if(false == bIsPlaying) {

                                   bIsPlaying = true;

                                   bIsRelease = false;

                                   mMediaPlayer = MediaPlayer.create(getApplicationContext(), R.raw.avil);

                                   try {

                                          mMediaPlayer.prepare();

                                          System.out.println("prepare");

                                   } catch (IllegalStateException e) {

                                          // TODO Auto-generated catch block

                                          e.printStackTrace();

                                   } catch (IOException e) {

                                          // TODO Auto-generated catch block

                                          e.printStackTrace();

                                   }

                                   mMediaPlayer.start();

                                   mTextView.setText("Playing...");

                            }                         

                            mMediaPlayer.setOnCompletionListener(new OnCompletionListener() {

                                   @Override

                                   public void onCompletion(MediaPlayer mp) {

                                          // TODO Auto-generated method stub

                                          mTextView.setText("Stop");

                                          mMediaPlayer.release();

                                   }

                            });

                     }

              });

              mStopImageButton.setOnClickListener(new OnClickListener() {

                    

                     @Override

                     public void onClick(View v) {

                            // TODO Auto-generated method stub

                                   if(false == bIsRelease) {

                                          mMediaPlayer.stop();

                                          mMediaPlayer.release();

                                          bIsRelease = true;

                                   }

                                   bIsPlaying = false;

                                   mTextView.setText("Stop...Press Play to Start...");

                                  

                     }

              });

              mPauseImageButton.setOnClickListener(new OnClickListener() {

                    

                     @Override

                     public void onClick(View v) {

                            // TODO Auto-generated method stub

                            if(null != mMediaPlayer) {

                                   if(false == bIsRelease) {

                                          if(false == bIsPause) {

                                                 bIsPause = true;

                                                 mTextView.setText("Pause...Press Again To Playing");

                                                 mMediaPlayer.pause();

                                                

                                          } else {

                                                 bIsPause = false;

                                                 mMediaPlayer.start();

                                                 mTextView.setText("Playing...");

                                          }

                                         

                                   }

                            }

                     }

              });

             

             

             

       }

 

       @Override

       public boolean onKeyDown(int keyCode, KeyEvent event) {

              // TODO Auto-generated method stub

              if(keyCode == KeyEvent.KEYCODE_BACK) {

                     mMediaPlayer.release();

              }

              return super.onKeyDown(keyCode, event);

       }

}