安卓高级8 SurfaceView案例三 结合mediaplay播放视频

我们知道mediaplay无法直接播放视频所以我们结合Surface

package qianfeng.com.mediaplayerdemo;

import android.media.MediaPlayer;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.widget.SeekBar;

public class MainActivity extends AppCompatActivity implements SurfaceHolder.Callback {

    private SurfaceView surfaceView;
    private SeekBar seekBar;
    private SurfaceHolder holder;
    private MediaPlayer player;
    private boolean flag = true;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        initView();

    }

    private void initView() {
        surfaceView = (SurfaceView) findViewById(R.id.surfaceView);
        seekBar = (SeekBar) findViewById(R.id.seekBar);
        // 实例化SurfaceView
        holder = surfaceView.getHolder();
        holder.addCallback(this);
        //  固定SurfaceView的屏幕大小//然而我发现没什么用
        holder.setKeepScreenOn(true);
        holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

        // 实例化播放器
        player = MediaPlayer.create(this, R.raw.fade);
        // 设置seekBar 的属性
        seekBar.setMax(player.getDuration());
        seekBar.setProgress(0);

        // 设置监听器
        seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
            @Override
            public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
                //  fromUser true 表示 是  用户在用手指拖拽  导致  seekBar 滑动了
                //  false  表示      seekBar在通过setProgress方法   改变
                if (fromUser)
                    player.seekTo(progress);
            }

            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {
                // 开始拖拽
                player.pause();
            }

            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {
                // 结束拖拽
                player.start();
            }
        });


    }

    public void onClick(View view) {
        switch (view.getId()) {
            case R.id.start_bt:
                //点击开始播放
                if (player != null && !player.isPlaying()) {
                    player.start();
                }
                break;
            case R.id.pause_bt:
                if (player != null && player.isPlaying()) {
                    player.pause();
                }
                break;
        }
    }

    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        if (player != null) {
            // 设置显示预览
            player.setDisplay(holder);
        }
        // 开启线程    循环获取 播放进度  使用Hanlder 更新seekbar
        new ProgressThread().start();
    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {

    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {

    }

    class ProgressThread extends Thread {
        @Override
        public void run() {
            super.run();
            while (flag) {
                try {
                    //  每一秒 发送一次
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                Message message = Message.obtain();
                // 获取 当前的 播放进度更新 seekBar
                message.arg1 = player.getCurrentPosition();
                handler.sendMessage(message);
            }
        }
    }


    private Handler handler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            int arg1 = msg.arg1;
            // 更新SeekBar
            seekBar.setProgress(arg1);
        }
    };

    @Override
    protected void onDestroy() {
        super.onDestroy();
        flag = false;
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="qianfeng.com.mediaplayerdemo.MainActivity">


    <SurfaceView
        android:id="@+id/surfaceView"
        android:layout_width="match_parent"
        android:layout_height="400dp" />

    <SeekBar
        android:id="@+id/seekBar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <Button
            android:id="@+id/start_bt"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:onClick="onClick"
            android:text="播放" />

        <Button
            android:id="@+id/pause_bt"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:onClick="onClick"
            android:text="暂停" />

    </LinearLayout>

</LinearLayout>