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"
android:layout_width="fill_parent" android:layout_height="fill_parent"
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical">
<seekbar android:id="@+id/seekbar01" android:layout_height="wrap_content"
android:layout_width="fill_parent">
<linearlayout android:id="@+id/linearlayout02"
android:layout_width="wrap_content" android:layout_height="wrap_content">
<button android:id="@+id/button01" android:layout_width="wrap_content"
android:layout_height="wrap_content" android:text="播放音频">
<button android:id="@+id/button02" android:layout_width="wrap_content"
android:layout_height="wrap_content" android:text="停止播放">
<seekbar android:id="@+id/seekbar02" android:layout_height="wrap_content"
android:layout_width="fill_parent">
<surfaceview android:id="@+id/surfaceview01"
android:layout_width="fill_parent" android:layout_height="250px">
<linearlayout android:id="@+id/linearlayout02"
android:layout_width="wrap_content" android:layout_height="wrap_content">
<button android:layout_width="wrap_content"
android:layout_height="wrap_content" android:id="@+id/button03"
android:text="播放视频">
<button android:layout_width="wrap_content"
android:layout_height="wrap_content" android:text="停止播放" android:id="@+id/button04">
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本文程序的源码，有点长：
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package com.testmedia;
import java.io.ioexception;
import java.util.timer;
import java.util.timertask;
import android.app.activity;
import android.media.audiomanager;
import android.media.mediaplayer;
import android.os.bundle;
import android.view.surfaceholder;
import android.view.surfaceview;
import android.view.view;
import android.widget.button;
import android.widget.seekbar;
import android.widget.toast;
public class testmedia extends activity {
/** called when the activity is first created. */
private seekbar skb_audio=null;
private button btn_start_audio = null;
private button btn_stop_audio = null;
private seekbar skb_video=null;
private button btn_start_video = null;
private button btn_stop_video = null;
private surfaceview surfaceview;
private surfaceholder surfaceholder;
private mediaplayer m = null;
private timer mtimer;
private timertask mtimertask;
private boolean ischanging=false;//互斥变量，防止定时器与seekbar拖动时进度冲突
@override
public void oncreate(bundle savedinstancestate) {
super.oncreate(savedinstancestate);
setcontentview(r.layout.main);
//----------media控件设置---------//
m=new mediaplayer();
//播放结束之后弹出提示
m.setoncompletionlistener(new mediaplayer.oncompletionlistener(){
@override
public void oncompletion(mediaplayer arg0) {
toast.maketext(testmedia.this, "结束", 1000).show();
m.release();
}
});
//----------定时器记录播放进度---------//
mtimer = new timer();
mtimertask = new timertask() {
@override
public void run() {
if(ischanging==true)
return;
if(m.getvideoheight()==0)
skb_audio.setprogress(m.getcurrentposition());
else
skb_video.setprogress(m.getcurrentposition());
}
};
mtimer.schedule(mtimertask, 0, 10);
btn_start_audio = (button) this.findviewbyid(r.id.button01);
btn_stop_audio = (button) this.findviewbyid(r.id.button02);
btn_start_audio.setonclicklistener(new clickevent());
btn_stop_audio.setonclicklistener(new clickevent());
skb_audio=(seekbar)this.findviewbyid(r.id.seekbar01);
skb_audio.setonseekbarchangelistener(new seekbarchangeevent());
btn_start_video = (button) this.findviewbyid(r.id.button03);
btn_stop_video = (button) this.findviewbyid(r.id.button04);
btn_start_video.setonclicklistener(new clickevent());
btn_stop_video.setonclicklistener(new clickevent());
skb_video=(seekbar)this.findviewbyid(r.id.seekbar02);
skb_video.setonseekbarchangelistener(new seekbarchangeevent());
surfaceview = (surfaceview) findviewbyid(r.id.surfaceview01);
surfaceholder = surfaceview.getholder();
surfaceholder.setfixedsize(100, 100);
surfaceholder.settype(surfaceholder.surface_type_push_buffers);
}
/*
* 按键事件处理
*/
class clickevent implements view.onclicklistener{
@override
public void onclick(view v) {
if(v==btn_start_audio)
{
m.reset();//恢复到未初始化的状态
m=mediaplayer.create(testmedia.this, r.raw.big);//读取音频
skb_audio.setmax(m.getduration());//设置seekbar的长度
try {
m.prepare(); //准备
} catch (illegalstateexception e) {
// todo auto-generated catch block
e.printstacktrace();
} catch (ioexception e) {
// todo auto-generated catch block
e.printstacktrace();
}
m.start(); //播放
}
else if(v==btn_stop_audio || v==btn_stop_video)
{
m.stop();
}
else if(v==btn_start_video)
{
m.reset();//恢复到未初始化的状态
m=mediaplayer.create(testmedia.this, r.raw.test);//读取视频
skb_video.setmax(m.getduration());//设置seekbar的长度
m.setaudiostreamtype(audiomanager.stream_music);
m.setdisplay(surfaceholder);//设置屏幕
try {
m.prepare();
} catch (illegalargumentexception e) {
// todo auto-generated catch block
e.printstacktrace();
} catch (illegalstateexception e) {
// todo auto-generated catch block
e.printstacktrace();
} catch (ioexception e) {
// todo auto-generated catch block
e.printstacktrace();
}
m.start();
}
}
}
/*
* seekbar进度改变事件
*/
class seekbarchangeevent implements seekbar.onseekbarchangelistener{
@override
public void onprogresschanged(seekbar seekbar, int progress,
boolean fromuser) {
// todo auto-generated method stub
}
@override
public void onstarttrackingtouch(seekbar seekbar) {
ischanging=true;
}
@override
public void onstoptrackingtouch(seekbar seekbar) {
m.seekto(seekbar.getprogress());
ischanging=false;
}
}
}
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以上就是21天学习android开发教程第一篇关于mediaplayer的相关介绍，希望对大家的学习有所帮助。