SurfaceView 实现 播放视频 以及 弹幕效果

效果展示

MediaPlayer服务
package com.example.app2;

import android.app.Service;
import android.content.Intent;
import android.media.MediaPlayer;
import android.os.Binder;
import android.os.IBinder;

import java.io.IOException;

public class MyService extends Service {
public static MediaPlayer mediaPlayer=new MediaPlayer();

@Override
public void onCreate() {
    super.onCreate();
   if (mediaPlayer!=null){
       try {
           mediaPlayer.reset();
           mediaPlayer.setDataSource("http://uvideo.spriteapp.cn/video/2019/0512/56488d0a-7465-11e9-b91b-1866daeb0df1_wpd.mp4");
           mediaPlayer.prepareAsync();

       } catch (IOException e) {
           e.printStackTrace();
       }
   }

}

@Override
public IBinder onBind(Intent intent) {
    return new MyBinder();
}

class MyBinder extends Binder{

    public void pause(){
        if (mediaPlayer!=null){
            mediaPlayer.pause();
        }
    }
    public void start(){
        if (mediaPlayer!=null){
            mediaPlayer.start();
        }
    }
    public long getDuration(){
       return mediaPlayer.getDuration();
    }
    public int getCurrent(){
        return mediaPlayer.getCurrentPosition();
    }
    public void seeTo(int postion){
        mediaPlayer.seekTo(postion);
    }
}

}
XML布局代码

DanMu类 package com.example.app2;

public class DanMu {
String text;
int x;
int y;
int size;
int color;

public DanMu(String text, int x, int y, int size, int color) {
    this.text = text;
    this.x = x;
    this.y = y;
    this.size = size;
    this.color = color;
}

public String getText() {
    return text;
}

public void setText(String text) {
    this.text = text;
}

public int getX() {
    return x;
}

public void setX(int x) {
    this.x = x;
}

public int getY() {
    return y;
}

public void setY(int y) {
    this.y = y;
}

public int getSize() {
    return size;
}

public void setSize(int size) {
    this.size = size;
}

public int getColor() {
    return color;
}

public void setColor(int color) {
    this.color = color;
}

}

4.Java代码
package com.example.app2;

import android.annotation.SuppressLint;
import android.content.ComponentName;
import android.content.Intent;
import android.content.ServiceConnection;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.PixelFormat;
import android.graphics.PorterDuff;
import android.media.MediaPlayer;
import android.os.Handler;
import android.os.IBinder;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ProgressBar;
import android.widget.SeekBar;

import com.example.app2.R;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Timer;
import java.util.TimerTask;

/**

• 1.surfaceview的特点:高频率刷新页面
• 2.功能：
• (1)播放视频：Surfaceview+MediaPalyer
• (2)发送弹幕
• (3)画板
• (4)绘制各种滚动的数据
• (5)射击类小游戏
  **/

public class MainActivity extends AppCompatActivity implements SurfaceHolder.Callback {
Button bt_pause, bt_play, bt_danmu;
SeekBar seekBar;
ArrayList list=new ArrayList<>();
int x = 0;
EditText editText;
MyService.MyBinder myBinder;
String string="";
ServiceConnection serviceConnection = new ServiceConnection() {
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
myBinder = (MyService.MyBinder) service;
}

    @Override
    public void onServiceDisconnected(ComponentName name) {

    }
};
@SuppressLint("HandlerLeak")
Handler handler=new Handler(){
    @Override
    public void handleMessage(Message msg) {
        super.handleMessage(msg);
        if (msg.what==101){
            long duration = myBinder.getDuration();
            seekBar.setMax((int) duration);
            int current = myBinder.getCurrent();
            seekBar.setProgress(current);
        }
    }
};
SurfaceHolder surfaceHolder,surfaceHolder2;//通过surfaceview获得
SurfaceView surfaceView,surfaceView2;//控件，画视频，不能直接画界面，SurfaceHolder

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Intent intent = new Intent(this, MyService.class);
    bindService(intent, serviceConnection, BIND_AUTO_CREATE);
    initView();

    init();
}

private void init() {
    seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
        @Override
        public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {

        }

        @Override
        public void onStartTrackingTouch(SeekBar seekBar) {

        }

        @Override
        public void onStopTrackingTouch(SeekBar seekBar) {
            long duration = myBinder.getDuration();
            seekBar.setMax((int) duration);
            int progress = seekBar.getProgress();
            myBinder.seeTo(progress);
        }
    });
    Timer timer = new Timer();
    timer.schedule(new TimerTask() {
        @Override
        public void run() {
            if (myBinder!=null){
                handler.sendEmptyMessage(101);
            }
        }
    },0,1000);
}

private void initView() {
    editText=findViewById(R.id.editText);
    bt_pause = findViewById(R.id.bt1);
    bt_play = findViewById(R.id.bt2);
    bt_danmu = findViewById(R.id.bt3);
    seekBar = findViewById(R.id.progeressBar);
    bt_danmu.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            string=editText.getText().toString();
            int y= (int) (Math.random()*100);
            list.add(new DanMu(string,0,y,50,Color.BLUE));
        }
    });
    bt_pause.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            myBinder.pause();
        }
    });
    bt_play.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            myBinder.start();
        }
    });
    surfaceView = findViewById(R.id.sufaceView);
    surfaceHolder = surfaceView.getHolder();//获得Holder
    surfaceHolder.addCallback(this);//设置回调，目的获取surfaceview的生命周期

    surfaceView2 = findViewById(R.id.sufaceView2);
    surfaceHolder2 = surfaceView2.getHolder();
    surfaceHolder2.addCallback(this);
    surfaceView2.setZOrderOnTop(true);
    surfaceHolder2.setFormat(PixelFormat.TRANSLUCENT);
}

//创建：在这里面画视频，画各种各样的图形
@Override
public void surfaceCreated(SurfaceHolder holder) {
    //mediaplayer和surfaceholder绑定
    if (holder==surfaceHolder){
        MyService.mediaPlayer.setDisplay(surfaceHolder);

    }else if (holder==surfaceHolder2){

                new Thread(){
                    @Override
                    public void run() {
                        super.run();
                        while (true){
                            try {
                                Thread.sleep(1);
                            } catch (InterruptedException e) {
                                e.printStackTrace();
                            }
                            Paint paint = new Paint();
                            paint.setStrokeWidth(5);
                            paint.setColor(Color.RED);
                            paint.setTextSize(30);
                            Canvas canvas = surfaceHolder2.lockCanvas();
                            if (canvas==null){
                                break;
                            }
                            canvas.drawColor(PixelFormat.TRANSPARENT,PorterDuff.Mode.CLEAR);
                            for (int i=0;i