小程序 Mp3上下曲实现源码.rar

package com.test; import android.app.Activity; import android.media.MediaPlayer; import android.os.Bundle; import android.view.View; import android.widget.ImageButton; import android.widget.TextView; public class MusicActivity extends Activity { /* 声明一个 ImageButton,TextView,MediaPlayer变量 */ private ImageButton mButton01, mButton02, mButton03; private TextView mTextView01; private MediaPlayer mMediaPlayer01; /* 声明一个Flag作为确认音乐是否暂停的变量并默认为false */ private boolean bIsPaused = false; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); /* 通过findViewById构造器创建TextView与ImageView对象 */ mButton01 = (ImageButton) findViewById(R.id.myButton1); mButton02 = (ImageButton) findViewById(R.id.myButton2); mButton03 = (ImageButton) findViewById(R.id.myButton3); mTextView01 = (TextView) findViewById(R.id.myTextView1); /* onCreate时创建MediaPlayer对象 */ mMediaPlayer01 = new MediaPlayer(); /* 将音乐以Import的方式存储在res/raw/always.mp3 */ mMediaPlayer01 = MediaPlayer.create(MusicActivity.this, R.raw.big); /* 运行播放音乐的按钮 */ mButton01.setOnClickListener(new ImageButton.OnClickListener() { @Override /* 覆盖OnClick事件 */ public void onClick(View v) { try { if (mMediaPlayer01 != null) { mMediaPlayer01.stop(); } /* * 在MediaPlayer取得播放资源与stop()之后 * 要准备Playback的状态前一定要使用MediaPlayer.prepare() */ mMediaPlayer01.prepare(); /* 开始或回复播放 */ mMediaPlayer01.start(); /* 改变TextView为开始播放状态 */ mTextView01.setText(R.string.str_start); } catch (Exception e) { // TODO Auto-generated catch block mTextView01.setText(e.toString()); e.printStackTrace(); } } }); /* 停止播放 */ mButton02.setOnClickListener(new ImageButton.OnClickListener() { @Override public void onClick(View arg0) { // TODO Auto-generated method stub try { if (mMediaPlayer01 != null) { /* 停止播放 */ mMediaPlayer01.stop(); /* 改变TextView为停止播放状态 */ mTextView01.setText(R.string.str_close); } } catch (Exception e) { // TODO Auto-generated catch block mTextView01.setText(e.toString()); e.printStackTrace(); } } }); /* 暂停播放 */ mButton03.setOnClickListener(new ImageButton.OnClickListener() { @Override public void onClick(View arg0) { // TODO Auto-generated method stub try { if (mMediaPlayer01 != null) { /* 是否为暂停状态=否 */ if (bIsPaused == false) { /* 暂停播放 */ mMediaPlayer01.pause(); /* 设置Flag为treu表示 Player状态为暂停 */ bIsPaused = true; /* 改变TextView为暂停播放 */ mTextView01.setText(R.string.str_pause); } /* 是否为暂停状态=是 */ else if (bIsPaused == true) { /* 回复播出状态 */ mMediaPlayer01.start(); /* 设置Flag为false表示 Player状态为非暂停状态 */ bIsPaused = false; /* 改变TextView为开始播放 */ mTextView01.setText(R.string.str_start); } } } catch (Exception e) { // TODO Auto-generated catch block mTextView01.setText(e.toString()); e.printStackTrace(); } } }); /* 当MediaPlayer.OnCompletionLister会运行的Listener */ mMediaPlayer01 .setOnCompletionListener(new MediaPlayer.OnCompletionListener() { // @Override /* 覆盖文件播出完毕事件 */ public void onCompletion(MediaPlayer arg0) { try { /* * 解除资源与MediaPlayer的赋值关系 让资源可以为其它程序利用 */ mMediaPlayer01.release(); /* 改变TextView为播放结束 */ mTextView01 .setText(R.string.str_OnCompletionListener); } catch (Exception e) { mTextView01.setText(e.toString()); e.printStackTrace(); } } }); /* 当MediaPlayer.OnErrorListener会运行的Listener */ mMediaPlayer01.setOnErrorListener(new MediaPlayer.OnErrorListener() { @Override /* 覆盖错误处理事件 */ public boolean onError(MediaPlayer arg0, int arg1, int arg2) { // TODO Auto-generated method stub try { /* 发生错误时也解除资源与MediaPlayer的赋值 */ mMediaPlayer01.release(); mTextView01.setText(R.string.str_OnErrorListener); } catch (Exception e) { mTextView01.setText(e.toString()); e.printStackTrace(); } return false; } }); } @Override /* 覆盖主程序暂停状态事件 */ protected void onPause() { // TODO Auto-generated method stub try { /* 再主程序暂停时解除资源与MediaPlayer的赋值关系 */ mMediaPlayer01.release(); } catch (Exception e) { mTextView01.setText(e.toString()); e.printStackTrace(); } super.onPause(); } }