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"> |
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; } }} |
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。
