android---视频播放---VideoView

《Hello Andriod》中第五章介绍了andriod视频播放内容,但不全。

先贴代码:

package com.example.video;

import java.io.File;


import android.support.v4.app.Fragment;
import android.app.Activity;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.MediaController;
import android.widget.VideoView;

public class Video extends Activity {

	private VideoView video;
	MediaController mediaco;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_video);

		video = (VideoView) findViewById(R.id.video);
		mediaco = new MediaController(this);
		File file = new File("/mnt/sdcard/Gee.mp4");
		if(file.exists())
		{
			video.setVideoPath(file.getAbsolutePath());
			video.setMediaController(mediaco);
			mediaco.setMediaPlayer(video);
			video.requestFocus();
		}
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {

		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.video, menu);
		return true;
	}

	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
		// Handle action bar item clicks here. The action bar will
		// automatically handle clicks on the Home/Up button, so long
		// as you specify a parent activity in AndroidManifest.xml.
		int id = item.getItemId();
		if (id == R.id.action_settings) {
			return true;
		}
		return super.onOptionsItemSelected(item);
	}

	/**
	 * A placeholder fragment containing a simple view.
	 */
	public static class PlaceholderFragment extends Fragment {

		public PlaceholderFragment() {
		}

		@Override
		public View onCreateView(LayoutInflater inflater, ViewGroup container,
				Bundle savedInstanceState) {
			View rootView = inflater.inflate(R.layout.fragment_video,
					container, false);
			return rootView;
		}
	}

}

布局文件如下:

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.video.Video"
    tools:ignore="MergeRootFrame" >

	<VideoView 
	    android:id="@+id/video"
	    android:layout_height="wrap_content"
	    android:layout_width="wrap_content"
	    android:layout_gravity="center"/>
</FrameLayout>


用到了两个东西:1.VideoView   2.MediaController  。

发现该程序不可以真机测试运行,因为测试时sd卡是不能读取的,但是程序需要读取sd卡中的视频文件(Gee.mp4是事先拷贝到sd中),故将程序安装好后,断开数据线后跑程序就没问题了。

ps:视频播放时,若旋转屏幕会导致视频从头播放;    解决办法:调用onRetainNonConfigurationInstance()保存onCreate()中的数据,调用getLastNonConfigurationInstance()恢复数据。

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