如何使用SurfaceView实现视频弹幕

这篇文章主要为大家展示了"如何使用SurfaceView实现视频弹幕"，内容简而易懂，条理清晰，希望能够帮助大家解决疑惑，下面让小编带领大家一起研究并学习一下"如何使用SurfaceView实现视频弹幕"这篇文章吧。

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();    }  }  /**   * 发送的信息   *   * @param view   */  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  }  /**   * surfaceCreated:创建   *   * @param holder   */  @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

以上是"如何使用SurfaceView实现视频弹幕"这篇文章的所有内容，感谢各位的阅读！相信大家都有了一定的了解，希望分享的内容对大家有所帮助，如果还想学习更多知识，欢迎关注行业资讯频道！