使用SurfaceView实现视频弹幕

本文实例为大家分享了SurfaceView视频弹幕展示的具体代码，供大家参考，具体内容如下

全部代码如下:

package com.example.app2;

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.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.text.TextUtils;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity implements SurfaceHolder.Callback {
  private SurfaceView mSvVideo;
  private SurfaceView mSvDanMu;
  private EditText mEd;

  private MediaPlayer mediaPlayer;
  private SurfaceHolder svVideoHolder, svDanMuHolder;

  private boolean isPlay = true;
  List list = new ArrayList<>();

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

    // 初始化视图
    initView();
  }

  private void initPlayer() {
    if (mediaPlayer == null) {
      mediaPlayer = new MediaPlayer();
    }
    // 重置
    mediaPlayer.reset();

    try {
      mediaPlayer.setDataSource("http://clips.vorwaerts-gmbh.de/big_buck_bunny.mp4");
      mediaPlayer.prepareAsync(); //异步准备
      mediaPlayer.setonPreparedListener(new MediaPlayer.onPreparedListener() {
 @Override
 public void onPrepared(MediaPlayer mp) {
   mediaPlayer.setLooping(true); //是否开启循环播放
   mediaPlayer.start(); //开始播放
 }
      });
    } catch (IOException e) {
      e.printStackTrace();
    }
  }

  
  public void send(View view) {
    submit();
  }

  private void submit() {
    // validate 非空判断
    String edString = mEd.getText().toString().trim();
    if (TextUtils.isEmpty(edString)) {
      Toast.makeText(this, "edString不能为空", Toast.LENGTH_SHORT).show();
      return;
    }

    list.add(new DanMuBean(edString)); //添加数据
    mEd.setText(""); //清空
  }

  private void initView() {
    mSvVideo = (SurfaceView) findViewById(R.id.sv_video);
    mSvDanMu = (SurfaceView) findViewById(R.id.sv_danMu);
    mEd = (EditText) findViewById(R.id.ed);

    // 初始化 svDanMuHolder svVideoHolder
    svVideoHolder = mSvVideo.getHolder();
    svDanMuHolder = mSvDanMu.getHolder();

    // 添加监听
    svVideoHolder.addCallback(this);
    svDanMuHolder.addCallback(this);

    // 将弹幕显示在最上层, 并设置为透明
    mSvDanMu.setZOrderonTop(true);
    svDanMuHolder.setFormat(PixelFormat.TRANSPARENT); //PixelFormat: 像素格式, TRANSPARENT(2):透明的; TRANSLUCENT(-3):半透明
  }

  
  @Override
  public void surfaceCreated(SurfaceHolder holder) {
    if (holder == svVideoHolder) {
      mediaPlayer.setDisplay(svVideoHolder); //将内容显示在 svVideoHolder上
    } else if (holder == svDanMuHolder) {
      // 弹幕设置 开启线程
      new Thread(new Runnable() {
 @Override
 public void run() {
   while (isPlay) { //死循环
     // 得到画笔, 设置属性
     Paint paint = new Paint();
     paint.setStrokeWidth(5); //设置笔画宽度
     paint.setTextSize(30); //设置字体大小
     paint.setColor(Color.GREEN); // 设置颜色

     // 得到画布 通过lockCanvas
     Canvas canvas = svDanMuHolder.lockCanvas();
     if (canvas == null) {
break;
     }

     // 填充画布的颜色
     canvas.drawColor(PixelFormat.TRANSPARENT, PorterDuff.Mode.CLEAR); //参数1: 设为透明, 参2: PorterDuff.Mode.CLEAR: 所绘制不会提交到画布上

     // 设置弹幕内容
     for (int i = 0; i < list.size(); i++) {
String text = list.get(i).text;
canvas.drawText(text, list.get(i).x += 1, list.get(i).y, paint);

if (list.get(i).x > mSvVideo.getWidth()) {
  list.get(i).x = 0;
}
     }

     // 提交
     svDanMuHolder.unlockCanvasAndPost(canvas);
   }
 }
      }).start();
    }
  }

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

  }

  @Override
  public void surfaceDestroyed(SurfaceHolder holder) {
    isPlay = false;
  }
}

布局xml

效果界面：

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持考高分网。