Android开发之初探视频的播放

Android开发之初探视频的播放

/*

* Android开发之初探视频的播放

* 北京Android俱乐部群：167839253

* Created on: 2011-8-24

* Author: blueeagle

* Email: liujiaxiang@gmail.com

*/

Android下视频的播放跟音频的播放是有一些区别的。需要有一个空间来存放视频文件。关于视频的播放其实费了一点功夫，程序代码很简单，但是对于播放，可能会出这样那样的问题，现在总结一下，步骤如下：

1.创建sdcard的镜像文件，可以在命令行下输入mksdcard 512M C:\sdcard.img

2.在Eclipse的window下找到Preferences菜单，然后点击Android->launch然后在Default emulator Options中填上“-sdcard C:\sdcard.img”

3.运行模拟器

有些时候，这样并不能成功，可以直接push到模拟器中。注意一定要选择一个小一点的3gp文件。

代码如下：

/*
 *  Android开发之视频的播放
 *  MyVideo.java
 *  Created on: 2011-8-24
 *  Author: blueeagle
 *  Email: liujiaxiang@gmail.com
 */
package com.blueeagle;

import android.app.Activity;
import android.graphics.PixelFormat;
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.view.View.OnClickListener;
import android.widget.Button;

public class MyVideo extends Activity implements OnClickListener,SurfaceHolder.Callback{    
    String path = "/data/222.3gp";
    Button play_button;
    Button pause_button;
    boolean isPause = false;
    SurfaceView mySurfaceView;
    MediaPlayer myMediaPlayer;
    SurfaceHolder surfaceHolder;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        play_button = (Button)findViewById(R.id.myButton);
        play_button.setOnClickListener(this);
        pause_button = (Button)findViewById(R.id.myButton2);
        pause_button.setOnClickListener(this);
        
        getWindow().setFormat(PixelFormat.UNKNOWN);
        mySurfaceView = (SurfaceView)findViewById(R.id.mySurfaceView);
        surfaceHolder = mySurfaceView.getHolder();
        surfaceHolder.addCallback(this);
        surfaceHolder.setFixedSize(176,144);
        surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
        myMediaPlayer = new MediaPlayer();
    }
	@Override
	public void onClick(View v) {
		// TODO Auto-generated method stub
		if(v==play_button)
		{
			isPause = false;
			System.out.println(path);
			playVideo(path);
		}
		else if(v==pause_button){
			if(isPause == false){
				myMediaPlayer.pause();
				isPause = true;
			}
			else{
				myMediaPlayer.start();
				isPause = false;
			}
		}		
	}
	private void playVideo(String strPath){
		if(myMediaPlayer.isPlaying()==true){
			myMediaPlayer.reset();
		}
		myMediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
		myMediaPlayer.setDisplay(surfaceHolder);//设置Video影片以SurfaceHolder播放
		try{
			myMediaPlayer.setDataSource(strPath);
			myMediaPlayer.prepare();
		}
		catch(Exception e){
			e.printStackTrace();
		}
		myMediaPlayer.start();
	}
	@Override
	public void surfaceChanged(SurfaceHolder holder, int format, int width,
			int height) {
		// TODO Auto-generated method stub
	}
	@Override
	public void surfaceCreated(SurfaceHolder holder) {
		// TODO Auto-generated method stub
	}
	@Override
	public void surfaceDestroyed(SurfaceHolder holder) {
		// TODO Auto-generated method stub
	}
}

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
    
    <SurfaceView
    android:id = "@+id/mySurfaceView"
    android:layout_width="320px"
    android:layout_height="200px">
    </SurfaceView>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    >
<Button
	android:id="@+id/myButton"  
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="播放"/>
 <Button
	android:id="@+id/myButton2"  
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="暂停"/> 
</LinearLayout>
</LinearLayout>

运行结果如下图：