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<DanMuBean> 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
<?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=".MainActivity"> <FrameLayout android:layout_width="match_parent" android:layout_height="wrap_content"> <SurfaceView android:id="@+id/sv_video" android:layout_width="match_parent" android:layout_height="280dp" /> <SurfaceView android:id="@+id/sv_danMu" android:layout_width="match_parent" android:layout_height="280dp" /> </FrameLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content"> <EditText android:id="@+id/ed" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:onClick="send" android:text="弹幕" /> </LinearLayout> </LinearLayout>
效果界面: