Main.xml程序如下：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/info"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="等待音频文件播放..." />
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<ImageButton
android:id="@+id/play"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@+drawable/play" />
<ImageButton
android:id="@+id/pause"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@+drawable/pause" />
<ImageButton
android:id="@+id/stop"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@+drawable/stop" />
</LinearLayout>
<SeekBar
android:id="@+id/seekbar"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
</LinearLayout>
.java程序如下
package org.lxh.demo;
import java.io.IOException;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.DialogInterface;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnCompletionListener;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnFocusChangeListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;
import android.widget.TextView;
public class Hello extends Activity {
private ImageButton play = null;
private ImageButton pause = null;
private ImageButton stop = null;
private TextView info = null;
private MediaPlayer myMediaPlayer = null;
private boolean pauseFlag = false;
private boolean playFlag = true;
private SeekBar seekbar = null;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState); // 生命周期方法
super.setContentView(R.layout.main); // 设置要使用的布局管理器
this.info = (TextView) super.findViewById(R.id.info);
this.play = (ImageButton) super.findViewById(R.id.play);
this.pause = (ImageButton) super.findViewById(R.id.pause);
this.stop = (ImageButton) super.findViewById(R.id.stop);
this.seekbar = (SeekBar) super.findViewById(R.id.seekbar);
this.play.setOnClickListener(new PlayOnClickListener());
this.pause.setOnClickListener(new PauseOnClickListener());
this.stop.setOnClickListener(new StopOnClickListener());
this.seekbar.setOnSeekBarChangeListener(new SeekBarChangeListener());
}
private class PlayOnClickListener implements OnClickListener {
public void onClick(View arg0) {
if (Hello.this.myMediaPlayer == null) {
Hello.this.myMediaPlayer = MediaPlayer.create(Hello.this,
R.raw.mldn_ad);// 找到资源
Hello.this.myMediaPlayer
.setOnCompletionListener(new OnCompletionListener() {// 文件播放完
public void onCompletion(MediaPlayer myMediaPlayer) {
Hello.this.playFlag = false;
Hello.this.myMediaPlayer.release();
}
});
Hello.this.seekbar.setMax(Hello.this.myMediaPlayer
.getDuration());
UpdateSeekBar update = new UpdateSeekBar();
update.execute(1000);
try {
Hello.this.myMediaPlayer.prepare();
} catch (IllegalStateException e) {
Hello.this.info.setText("文件播放异常..." + e);
} catch (IOException e) {
Hello.this.info.setText("文件播放异常..." + e);
}
Hello.this.myMediaPlayer.start();
Hello.this.info.setText("正在播放音频文件...");
}
}
}
private class UpdateSeekBar extends AsyncTask<Integer, Integer, String> {
@Override
protected void onPostExecute(String result) {
}
@Override
protected void onProgressUpdate(Integer... progress) {
Hello.this.seekbar.setProgress(progress[0]);//更新拖动条
}
@Override
protected String doInBackground(Integer... params) {
while (Hello.this.playFlag) {
try {
Thread.sleep(params[0]);
} catch (InterruptedException e) {
e.printStackTrace();
}
this.publishProgress(Hello.this.myMediaPlayer
.getCurrentPosition());
}
return null;
}
}
private class PauseOnClickListener implements OnClickListener {
public void onClick(View arg0) {
if (Hello.this.myMediaPlayer != null) {
if (Hello.this.pauseFlag) {
Hello.this.myMediaPlayer.start();
Hello.this.pauseFlag = false;
} else {
Hello.this.myMediaPlayer.pause();
Hello.this.pauseFlag = true;
}
}
}
}
private class StopOnClickListener implements OnClickListener {
public void onClick(View arg0) {
if (Hello.this.myMediaPlayer != null) {
Hello.this.myMediaPlayer.stop();
Hello.this.info.setText("停止播放音频");
}
}
}
private class SeekBarChangeListener implements OnSeekBarChangeListener {
public void onProgressChanged(SeekBar arg0, int arg1, boolean arg2) {
}
public void onStartTrackingTouch(SeekBar arg0) {
}
public void onStopTrackingTouch(SeekBar arg0) {//拖动进度条后
Hello.this.myMediaPlayer.seekTo(Hello.this.seekbar.getProgress());
}
}
}
