Android_在线视频播放器

package com.itheima.musicplayer;

import java.io.File;

import java.io.IOException;

import android.app.Activity;

import android.media.AudioManager;

import android.media.MediaPlayer;

import android.media.MediaPlayer.OnCompletionListener;

import android.os.Bundle;

import android.view.SurfaceHolder;

import android.view.SurfaceHolder.Callback;

import android.view.SurfaceView;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

import android.widget.Toast;

public class MainActivity extends Activity {

private EditText et_path;

[code]private MediaPlayer mediaPlayer;

private Button bt_play,bt_pause,bt_stop,bt_replay;

private SurfaceView sv;
private SurfaceHolder holder;

private int position;
private String filepath;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    et_path = (EditText) findViewById(R.id.et_path);
    bt_play = (Button) findViewById(R.id.bt_play);
    bt_pause = (Button) findViewById(R.id.bt_pause);
    bt_stop = (Button) findViewById(R.id.bt_stop);
    bt_replay = (Button) findViewById(R.id.bt_replay);
    //得到surfaceview
    sv = (SurfaceView) findViewById(R.id.sv);
    //得到显示界面内容的容器
    holder = sv.getHolder();
    //在低版本模拟器上运行记得加上下面的参数。不自己维护双缓冲区，而是等待多媒体播放框架主动的推送数据。
    holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
    holder.addCallback(new Callback() {

        @Override
        public void surfaceDestroyed(SurfaceHolder holder) {
            System.out.println("destoryed");
            if(mediaPlayer!=null&&mediaPlayer.isPlaying()){
                position = mediaPlayer.getCurrentPosition();
                mediaPlayer.stop();
                mediaPlayer.release();
                mediaPlayer = null;
            }
        }

        @Override
        public void surfaceCreated(SurfaceHolder holder) {
            System.out.println("created");
            if(position>0){//记录的有播放进度。
                try {
                    mediaPlayer = new MediaPlayer();
                    mediaPlayer.setDataSource(filepath);//设置播放的数据源。
                    mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
                    mediaPlayer.setDisplay(holder);
                    mediaPlayer.prepare();//准备开始播放 播放的逻辑是c代码在新的线程里面执行。
                    mediaPlayer.start();
                    mediaPlayer.seekTo(position);
                    bt_play.setEnabled(false);
                    mediaPlayer.setOnCompletionListener(new OnCompletionListener() {
                        @Override
                        public void onCompletion(MediaPlayer mp) {
                            bt_play.setEnabled(true);
                        }
                    });
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

        @Override
        public void surfaceChanged(SurfaceHolder holder, int format, int width,
                int height) {
            System.out.println("changed");
        }
    });

}
/**
 * 播放
 * @param view
 */
public void play(View view) {
    filepath = et_path.getText().toString().trim();
    //File file = new File(filepath);
    if(filepath.startsWith("http://")){
        try {
            mediaPlayer = new MediaPlayer();
            mediaPlayer.setDataSource(filepath);//设置播放的数据源。
            mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
            mediaPlayer.setDisplay(holder);
            mediaPlayer.prepare();//准备开始播放 播放的逻辑是c代码在新的线程里面执行。
            mediaPlayer.start();
            bt_play.setEnabled(false);
            mediaPlayer.setOnCompletionListener(new OnCompletionListener() {
                @Override
                public void onCompletion(MediaPlayer mp) {
                    bt_play.setEnabled(true);
                }
            });
        } catch (Exception e) {
            e.printStackTrace();
            Toast.makeText(this, "播放失败", 0).show();
        }
    }else{
        Toast.makeText(this, "文件不存在，请检查文件的路径", 0).show();
    }
}
/**
 * 暂停
 * @param view
 */
public void pause(View view) {
    if("继续".equals(bt_pause.getText().toString())){
        mediaPlayer.start();
        bt_pause.setText("暂停");
        return;
    }
    if(mediaPlayer!=null&&mediaPlayer.isPlaying()){
        mediaPlayer.pause();
        bt_pause.setText("继续");
    }
}
/**
 * 停止
 * @param view
 */
public void stop(View view) {
    if(mediaPlayer!=null&&mediaPlayer.isPlaying()){
        mediaPlayer.stop();
        mediaPlayer.release();
        mediaPlayer = null;
    }
    bt_pause.setText("暂停");
    bt_play.setEnabled(true);
}
/**
 * 重播
 * @param view
 */
public void replay(View view) {
    if(mediaPlayer!=null&&mediaPlayer.isPlaying()){
        mediaPlayer.seekTo(0);
    }else{
        play(view);
    }
    bt_pause.setText("暂停");
}

}