android中使用SurfaceView做视频播放器--视频切换无缝连接

Android中的视频用到的有view.SurfaceHolder和view.SurfaceView，还有就是用到了MediaPlayer.OnBufferingUpdateListener和MediaPlayer.OnBufferingUpdateListener这里就是视频的主要的代码。

Java代码：主类

package com.example.testmediaplayer;
import android.app.Activity;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnBufferingUpdateListener;
import android.media.MediaPlayer.OnCompletionListener;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
public class MainActivity extends Activity implements
OnBufferingUpdateListener, OnCompletionListener,
MediaPlayer.OnPreparedListener, SurfaceHolder.Callback {
private static final String TAG = "Activity1";
private int mVideoWidth;
private int mVideoHeight;
private MediaPlayer mMediaPlayer;
private SurfaceView mPreview;
private SurfaceHolder holder;
private String path;
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
setContentView(R.layout.activity_main);
mPreview = (SurfaceView) findViewById(R.id.surfaceView1);
/* 得到SurfaceHolder对象 */
holder = mPreview.getHolder();
/* 设置回调函数 */
holder.addCallback(this);
/* 设置风格 */
holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
private void playVideo() {
try {
path = Environment.getExternalStorageDirectory().getPath()
+ "/pandora-19.mov";
/* 构建MediaPlayer对象 */
mMediaPlayer = new MediaPlayer();
/* 设置媒体文件路径 */
mMediaPlayer.setDataSource(path);
/* 设置通过SurfaceView来显示画面 */
mMediaPlayer.setDisplay(holder);
/* 准备 */
mMediaPlayer.prepare();
/* 设置事件监听 */
mMediaPlayer.setOnBufferingUpdateListener(this);
mMediaPlayer.setOnCompletionListener(this);
mMediaPlayer.setOnPreparedListener(this);
mMediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
} catch (Exception e) {
Log.e(TAG, "error: " + e.getMessage(), e);
}
}
public void onBufferingUpdate(MediaPlayer arg0, int percent) {
Log.d(TAG, "onBufferingUpdate percent:" + percent);
}
public void onCompletion(MediaPlayer arg0) {
Log.d(TAG, "onCompletion called");
mMediaPlayer.reset();
playVideo();
}
public void onPrepared(MediaPlayer mediaplayer) {
Log.d(TAG, "onPrepared called");
mVideoWidth = mMediaPlayer.getVideoWidth();
mVideoHeight = mMediaPlayer.getVideoHeight();
if (mVideoWidth != 0 && mVideoHeight != 0) {
/* 设置视频的宽度和高度 */
holder.setFixedSize(mVideoWidth, mVideoHeight);
/* 开始播放 */
mMediaPlayer.start();
}
}
/* 更改时出发的事件 */
public void surfaceChanged(SurfaceHolder surfaceholder, int i, int j, int k) {
Log.d(TAG, "surfaceChanged called");
}
/* 销毁 */
public void surfaceDestroyed(SurfaceHolder surfaceholder) {
Log.d(TAG, "surfaceDestroyed called");
}
/* 当SurfaceHolder创建时触发 */
public void surfaceCreated(SurfaceHolder holder) {
Log.d(TAG, "surfaceCreated called");
playVideo();
}
/* 销毁 */
@Override
protected void onDestroy() {
super.onDestroy();
if (mMediaPlayer != null) {
mMediaPlayer.release();
mMediaPlayer = null;
}
}
}

复制代码 main.xml文件

xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >
android:id="@+id/surfaceView1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"/>

复制代码注意：在onDestory方法中一定要销毁mediaplayer对象

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