本文介绍如何使用MediaPlayer播放音频和视频，并通过SeekBar调节进度。利用SurfaceView实现视频播放，提供播放/停止按钮及进度条控制。
本文介绍MediaPlayer的使用。MediaPlayer可以播放音频和视频，另外也可以通过VideoView来播放视频，虽然VideoView比MediaPlayer简单易用，但定制性不如用MediaPlayer，要视情况选择了。MediaPlayer播放音频比较简单，但是要播放视频就需要SurfaceView。SurfaceView比普通的自定义View更有绘图上的优势，它支持完全的OpenGL ES库。
先贴出本文程序运行结果的截图，上面是播放/停止音频，可用SeekBar来调进度，下面是播放/停止视频，也是用SeekBar来调进度：
main.xml的源码:
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<linearlayout android:id="@+id/LinearLayout01"
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android:layout_width="fill_parent" android:layout_height="fill_parent"
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xmlns:android="http://schemas.android.com/apk/res/android"
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android:orientation="vertical">
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<seekbar android:id="@+id/SeekBar01" android:layout_height="wrap_content"
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android:layout_width="fill_parent">
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<linearlayout android:id="@+id/LinearLayout02"
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android:layout_width="wrap_content" android:layout_height="wrap_content">
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<button android:id="@+id/Button01" android:layout_width="wrap_content"
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android:layout_height="wrap_content" android:text="播放音频">
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<button android:id="@+id/Button02" android:layout_width="wrap_content"
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android:layout_height="wrap_content" android:text="停止播放">
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<seekbar android:id="@+id/SeekBar02" android:layout_height="wrap_content"
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android:layout_width="fill_parent">
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<surfaceview android:id="@+id/SurfaceView01"
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android:layout_width="fill_parent" android:layout_height="250px">
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<linearlayout android:id="@+id/LinearLayout02"
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android:layout_width="wrap_content" android:layout_height="wrap_content">
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<button android:layout_width="wrap_content"
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android:layout_height="wrap_content" android:id="@+id/Button03"
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android:text="播放视频">
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<button android:layout_width="wrap_content"
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android:layout_height="wrap_content" android:text="停止播放" android:id="@+id/Button04">
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package com.testMedia;
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import java.io.IOException;
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import java.util.Timer;
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import java.util.TimerTask;
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import android.app.Activity;
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import android.media.AudioManager;
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import android.media.MediaPlayer;
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import android.os.Bundle;
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import android.view.SurfaceHolder;
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import android.view.SurfaceView;
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import android.view.View;
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import android.widget.Button;
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import android.widget.SeekBar;
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import android.widget.Toast;
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public class testMedia extends Activity {
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/** Called when the activity is first created. */
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private SeekBar skb_audio=null;
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private Button btn_start_audio = null;
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private Button btn_stop_audio = null;
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private SeekBar skb_video=null;
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private Button btn_start_video = null;
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private Button btn_stop_video = null;
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private SurfaceView surfaceView;
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private SurfaceHolder surfaceHolder;
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private MediaPlayer m = null;
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private Timer mTimer;
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private TimerTask mTimerTask;
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private boolean isChanging=false;//互斥变量，防止定时器与SeekBar拖动时进度冲突
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@Override
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public void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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setContentView(R.layout.main);
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//----------Media控件设置---------//
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m=new MediaPlayer();
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//播放结束之后弹出提示
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m.setOnCompletionListener(new MediaPlayer.OnCompletionListener(){
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@Override
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public void onCompletion(MediaPlayer arg0) {
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Toast.makeText(testMedia.this, "结束", 1000).show();
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m.release();
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}
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});
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//----------定时器记录播放进度---------//
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mTimer = new Timer();
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mTimerTask = new TimerTask() {
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@Override
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public void run() {
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if(isChanging==true)
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return;
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if(m.getVideoHeight()==0)
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skb_audio.setProgress(m.getCurrentPosition());
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else
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skb_video.setProgress(m.getCurrentPosition());
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}
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};
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mTimer.schedule(mTimerTask, 0, 10);
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btn_start_audio = (Button) this.findViewById(R.id.Button01);
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btn_stop_audio = (Button) this.findViewById(R.id.Button02);
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btn_start_audio.setOnClickListener(new ClickEvent());
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btn_stop_audio.setOnClickListener(new ClickEvent());
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skb_audio=(SeekBar)this.findViewById(R.id.SeekBar01);
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skb_audio.setOnSeekBarChangeListener(new SeekBarChangeEvent());
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btn_start_video = (Button) this.findViewById(R.id.Button03);
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btn_stop_video = (Button) this.findViewById(R.id.Button04);
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btn_start_video.setOnClickListener(new ClickEvent());
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btn_stop_video.setOnClickListener(new ClickEvent());
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skb_video=(SeekBar)this.findViewById(R.id.SeekBar02);
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skb_video.setOnSeekBarChangeListener(new SeekBarChangeEvent());
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surfaceView = (SurfaceView) findViewById(R.id.SurfaceView01);
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surfaceHolder = surfaceView.getHolder();
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surfaceHolder.setFixedSize(100, 100);
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surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
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}
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/*
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* 按键事件处理
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*/
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class ClickEvent implements View.OnClickListener{
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@Override
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public void onClick(View v) {
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if(v==btn_start_audio)
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{
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m.reset();//恢复到未初始化的状态
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m=MediaPlayer.create(testMedia.this, R.raw.big);//读取音频
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skb_audio.setMax(m.getDuration());//设置SeekBar的长度
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try {
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m.prepare(); //准备
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} catch (IllegalStateException e) {
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// TODO Auto-generated catch block
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e.printStackTrace();
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} catch (IOException e) {
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// TODO Auto-generated catch block
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e.printStackTrace();
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}
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m.start(); //播放
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}
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else if(v==btn_stop_audio || v==btn_stop_video)
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{
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m.stop();
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}
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else if(v==btn_start_video)
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{
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m.reset();//恢复到未初始化的状态
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m=MediaPlayer.create(testMedia.this, R.raw.test);//读取视频
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skb_video.setMax(m.getDuration());//设置SeekBar的长度
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m.setAudioStreamType(AudioManager.STREAM_MUSIC);
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m.setDisplay(surfaceHolder);//设置屏幕
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try {
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m.prepare();
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} catch (IllegalArgumentException e) {
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// TODO Auto-generated catch block
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e.printStackTrace();
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} catch (IllegalStateException e) {
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// TODO Auto-generated catch block
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e.printStackTrace();
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} catch (IOException e) {
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// TODO Auto-generated catch block
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e.printStackTrace();
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}
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m.start();
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}
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}
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}
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/*
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* SeekBar进度改变事件
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*/
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class SeekBarChangeEvent implements SeekBar.OnSeekBarChangeListener{
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@Override
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public void onProgressChanged(SeekBar seekBar, int progress,
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boolean fromUser) {
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// TODO Auto-generated method stub
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}
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@Override
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public void onStartTrackingTouch(SeekBar seekBar) {
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isChanging=true;
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}
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@Override
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public void onStopTrackingTouch(SeekBar seekBar) {
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m.seekTo(seekBar.getProgress());
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isChanging=false;
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}
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}
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- }
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