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[android] 03_播放在线视频

From Android 4.0

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播放在线视频
需要权限： <uses-permission android:name="android.permission.INTERNET"/>
核心代码：
package cn.zengfansheng.videoplay;
 
import android.app.Activity;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnPreparedListener;
import android.net.Uri;
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 cn.zengfansheng.onlinevideoplay.R;
 
public class MainActivity extends Activity {
 
    private EditText et_path;
    private Button bt_pause;
    private SurfaceView sv;
    private MediaPlayer mediaPlayer;
    private int currentPosition;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 
        et_path = (EditText) this.findViewById(R.id.et_path);
        bt_pause = (Button) this.findViewById(R.id.bt_pause);
        sv = (SurfaceView) this.findViewById(R.id.sv);
 
        // android4.0以下要加上，4.0后废弃了，告诉surfaceview 不要自己维护缓冲区 而是 等待多媒体播放器的框架 把数据填充过来
        //sv.getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);// 加上更好的兼容前面的低版本
 
        // 2.3 2.2模拟器有bug,播放不了视频， 需要用1.6模拟器或者真机
 
        // TODO c、为SurfaceHolder增加回调函数,//关心surfaceview holder的存活周期
        sv.getHolder().addCallback(new Callback() {
 
            @Override
            public void surfaceDestroyed(SurfaceHolder holder) {
                if (mediaPlayer != null && mediaPlayer.isPlaying()) {
                    currentPosition = mediaPlayer.getCurrentPosition();
                    mediaPlayer.stop();
                    mediaPlayer.release();
                    mediaPlayer = null;
                }
                System.out.println("holder 销毁了。。。播放位置：" + currentPosition);
            }
 
            @Override
            public void surfaceCreated(SurfaceHolder holder) {
                System.out.println("holder 创建了。。。");
                if (currentPosition > 0) {
                    try {
                        String videoPath = et_path.getText().toString().trim();
                        mediaPlayer = new MediaPlayer();
                        mediaPlayer
                                .setAudioStreamType(AudioManager.STREAM_MUSIC);
                        mediaPlayer.setDataSource(getApplicationContext(),
                                Uri.parse(videoPath));
                        mediaPlayer.setDisplay(sv.getHolder());
                        mediaPlayer.prepareAsync();
                        mediaPlayer.setOnPreparedListener(new OnPreparedListener() {
                                    @Override
                                    public void onPrepared(MediaPlayer mp) {
                                        System.out.println("从"+ currentPosition + "位置开始播放");
                                        mediaPlayer.seekTo(currentPosition);
                                        mediaPlayer.start();
                                    }
                                });
 
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }
 
            }
 
            @Override
            public void surfaceChanged(SurfaceHolder holder, int format,
                    int width, int height) {
                System.out.println("holder 变化了。。。");
            }
        });
    }
 
    /**
     * TODO 1、开始播放视频
     *
     * @param view
     */
    public void start(View view) {
        try {
            String videoPath = et_path.getText().toString().trim();
 
            mediaPlayer = new MediaPlayer();
            mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
            mediaPlayer.setDataSource(videoPath);
 
            mediaPlayer.setLooping(true);// 循环播放
 
            // TODO b、SurfaceHolder//画面显示在哪里
            SurfaceHolder sh = sv.getHolder();
            mediaPlayer.setDisplay(sh);
 
            // TODO a、prepareAsync()
            mediaPlayer.prepareAsync();
            mediaPlayer.setOnPreparedListener(new OnPreparedListener() {
                @Override
                public void onPrepared(MediaPlayer mp) {
                    mediaPlayer.start();
                }
            });
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
 
    /**
     * TODO 2、暂停播放视频
     *
     * @param view
     */
    public void pause(View view) {
 
        if ("续播".equals(bt_pause.getText().toString().trim()) && mediaPlayer!=null) {
            mediaPlayer.start();
            bt_pause.setText("暂停");
            return;
        }
        if (mediaPlayer != null && mediaPlayer.isPlaying()) {
            mediaPlayer.pause();
            bt_pause.setText("续播");
        }
    }
 
    /**
     * TODO 3、停止播放视频
     *
     * @param view
     */
    public void stop(View view) {
        if (mediaPlayer != null && mediaPlayer.isPlaying()) {
            mediaPlayer.stop();
            mediaPlayer.release();
            mediaPlayer = null;
        }
    }
 
    /**
     * TODO 4、重新播放视频
     *
     * @param view
     */
    public void replay(View view) {
        if (mediaPlayer != null && mediaPlayer.isPlaying()) {
            mediaPlayer.seekTo(0);
            mediaPlayer.start();
        }
        start(view);
    }
}

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