Android--VideoPlay--视频播放器

代码跟音乐播放器有大部分是相同的，各位可以将mp4格式的
视频文件放到sdcard卡中，在输入框中输入文件名即可，在
模拟器上运行请使用android2.0版本，据说其他版本的模拟器
不支持视频播放，如有错误之处请大家指出

java代码如下：

package cn.mrzhu;
import java.io.File;
import android.app.Activity;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnPreparedListener;
import android.os.Bundle;
import android.os.Environment;
import android.view.Su易做图ceHolder;
import android.view.Su易做图ceHolder.Callback;
import android.view.Su易做图ceView;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;
public class VideoPlayDemoActivity extends Activity {
private EditText nameText;
private String path;//文件路径
private MediaPlayer mediaPlayer;//media对象
private Su易做图ceView su易做图ceView;
private boolean pause;//暂停标记
private int position;//播放的进度
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

nameText = (EditText)findViewById(R.id.filename);
su易做图ceView = (Su易做图ceView)findViewById(R.id.su易做图ceview);

//把输送给su易做图ceview的视频画面，直接显示到屏幕上，不要维持它自身的缓冲区
su易做图ceView.getHolder().setType(Su易做图ceHolder.SURFACE_TYPE_PUSH_BUFFERS);
su易做图ceView.getHolder().setFixedSize(176, 144);//设置视频播放窗口的大小
su易做图ceView.getHolder().setKeepScreenOn(true);//保持屏幕高亮
su易做图ceView.getHolder().addCallback(new Su易做图ceCallback());
mediaPlayer = new MediaPlayer();//实例化一个播放器对象
}
private final class Su易做图ceCallback implements Callback{
public void su易做图ceChanged(Su易做图ceHolder holder, int format, int width,
    int height) {

}
/*
   * 当su易做图ceView被创建时
   */
public void su易做图ceCreated(Su易做图ceHolder holder) {
   if(position > 0 && path != null){
    play(position);
    position = 0;
   }
}
/*
   * 当su易做图ceView被销毁时
   */

public void su易做图ceDestroyed(Su易做图ceHolder holder) {
   mediaPlayer.stop();
}

}

/*
* 按钮事件，在main.xml中，每个按钮的click_on = mediaplay
*/
public void mediaplay(View v){
switch(v.getId()){

case R.id.playbutton://播放按钮
   String filename = nameText.getText().toString();//获取文件名
   File file = new File(Environment.getExternalStorageDirectory(), filename);
   if(file.exists()){
    path = file.getAbsolutePath();
    play(0);
   }else{
    //若路径不存在，弹出Toast提示
    Toast.makeText(getApplicationContext(), R.string.filenoexsit, Toast.LENGTH_SHORT).show();
   }
   break;

case R.id.pausebutton://暂停按钮
   if(mediaPlayer.isPlaying()){
    mediaPlayer.pause();
    pause = true;
   }else{
    mediaPlayer.start();
    pause = false;
   }
   break;

case R.id.resetbutton://重播按钮
   if(mediaPlayer.isPlaying()){
    mediaPlayer.seekTo(0);
   }else{
    if(path != null){
     play(0);//将播放进度置为0，恢复初始状态
    }
   }
   break;

case R.id.stopbutton://停止按钮
   if(mediaPlayer.isPlaying()){
    mediaPlayer.stop();
   }
   break;
}
}
private void play(int position) {
try {
   mediaPlayer.reset();
   mediaPlayer.setDataSource(path);
   mediaPlayer.setDisplay(su易做图ceView.getHolder());
   mediaPlayer.prepare();
   mediaPlayer.setOnPreparedListener(new PrepareListener(position));
} catch (Exception e) {
}
}

private final class PrepareListener implements OnPreparedListener{
private int position;
public PrepareListener(int position) {
   super();
   this.position = position;
}
public void onPrepared(MediaPlayer mp) {
   mediaPlayer.start();//播放视频
   if(position > 0) mediaPlayer.seekTo(position);
}

}
@Override
protected void onDestroy() {
mediaPlayer.release();
mediaPlayer = null;
super.onDestroy();
}
}

main.xml代码如下：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical"
    android:background="#FFFFFF" >
    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/filename" />
    <EditText
        android:id="@+id/filename"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/file"/>
    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/playbutton"
            android:onClick="mediaplay"
            android:text="@string/playbutton"
            />
&nbs

补充：移动开发 , Android ,