SurfaceView播放视频发送d幕并实现滚动歌词

概述SurfaceView播放视频发送d幕并实现滚动歌词 本文实例为大家分享了SurfaceView播放视频发送d幕,并实现滚动歌词,供大家参考,具体内容如下 SurfaceView使用步骤 使用SurfaceView的步骤: 首先要继承SurfaceView,实现SurfaceHolder.Callback接口. 重写方法:surfaceChanged:surface大小或格式发生变化时触发,在surfaceCreated调用后该函数至少会被调用一次. surfaceCreated:Surface创建时触发,一般在这个函数开启绘图线程(新的线程,不要

本文实例为大家分享了SurfaceVIEw播放视频发送d幕，并实现滚动歌词，供大家参考，具体内容如下

SurfaceVIEw使用步骤

使用SurfaceVIEw的步骤：

首先要继承SurfaceVIEw，实现SurfaceHolder.Callback接口。重写方法：surfaceChanged：surface大小或格式发生变化时触发，在surfaceCreated调用后该函数至少会被调用一次。surfaceCreated：Surface创建时触发，一般在这个函数开启绘图线程（新的线程，不要再这个线程中绘制Surface）。surfaceDestroyed：销毁时触发，一般不可见时就会销毁。利用getHolder()获取SurfaceHolder对象，调用SurfaceHolder.addCallback添加回调SurfaceHolder.lockCanvas 获取Canvas对象并锁定画布，调用Canvas绘图，SurfaceHolder.unlockCanvasAndPost 结束锁定画布，提交改变。

SurfaceHolder

SurfaceHolder回调自己的三个生命周期：

surfaceCreated(SurfaceHolder holder)创建时surfaceChanged(SurfaceHolder holder,int format,int wIDth,int height)改变时surfaceDestroyed(SurfaceHolder holder)销毁时

SurfaceVIEw播放视频并可以发送d幕

需要准备两个SurfaceVIEw，一个是负责播放视频，一个负责展示d幕。d幕是展示在视频上面的，所以我们要给展示d幕的SurfaceVIEw设置两个方法：
surfaceVIEw_danmu.setZOrderOntop(true); ——置于上方
surfaceVIEw_danmuHolder.setFormat(PixelFormat.transparent); ——背景透明

public class MainActivity extends AppCompatActivity implements SurfaceHolder.Callback {  public static final int PROGRESS = 101;  SurfaceVIEw surfaceVIEw,surfaceVIEw_danmu;  SurfaceHolder surfaceHolder,surfaceVIEw_danmuHolder;  MediaPlayer mediaPlayer = new MediaPlayer();  String path = "/sdcard/aa.mp4";  Seekbar seekbar;  Timer timer;  EditText editText;  button button,bt_start,bt_stop;  int x = 0;  ArrayList<DanMu> List = new ArrayList<>();  Handler handler = new Handler(){    @OverrIDe    public voID handleMessage(Message msg) {      super.handleMessage(msg);      if (msg.what == PROGRESS){        seekbar.setProgress((Integer) msg.obj);        mediaPlayer.setonSeekCompleteListener(new MediaPlayer.OnSeekCompleteListener() {          @OverrIDe          public voID onSeekComplete(MediaPlayer mp) {            Toast.makeText(MainActivity.this,"播放完毕！",Toast.LENGTH_SHORT).show();          }        });      }    }  };  @OverrIDe  protected voID onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentVIEw(R.layout.activity_main);    surfaceVIEw = findVIEwByID(R.ID.sufacevIEw);    surfaceVIEw_danmu = findVIEwByID(R.ID.sufacevIEw_danmu);    editText = findVIEwByID(R.ID.et);    button = findVIEwByID(R.ID.bt_send);    seekbar = findVIEwByID(R.ID.bar);    bt_start = findVIEwByID(R.ID.bt_start);    bt_stop = findVIEwByID(R.ID.bt_stop);    surfaceHolder = surfaceVIEw.getHolder();    surfaceHolder.addCallback(this);    surfaceVIEw_danmuHolder = surfaceVIEw_danmu.getHolder();    surfaceVIEw_danmuHolder.addCallback(this);    surfaceVIEw_danmu.setZOrderOntop(true);    surfaceVIEw_danmuHolder.setFormat(PixelFormat.transparent);    if (mediaPlayer!=null) {      try {        mediaPlayer.setDataSource(path);        mediaPlayer.prepareAsync();        mediaPlayer.setonPreparedListener(new MediaPlayer.OnPreparedListener() {          @OverrIDe          public voID onPrepared(MediaPlayer mp) {            mediaPlayer.start();            int duration = mediaPlayer.getDuration();            seekbar.setMax(duration);            timer = new Timer();            timer.schedule(new TimerTask() {              @OverrIDe              public voID run() {                int currentposition = mediaPlayer.getCurrentposition();                Message message = Message.obtain();                message.what = PROGRESS;                message.obj = currentposition;                handler.sendMessage(message);              }            },1000);          }        });        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) {            int progress = seekbar.getProgress();            mediaPlayer.seekTo(progress);          }        });      } catch (IOException e) {        e.printstacktrace();      }    }    button.setonClickListener(new VIEw.OnClickListener() {      @OverrIDe      public voID onClick(VIEw v) {        String s = editText.getText().toString();        int y= (int) (Math.random()*300);        List.add(new DanMu(0,y,s,color.RED));      }    });    bt_start.setonClickListener(new VIEw.OnClickListener() {      @OverrIDe      public voID onClick(VIEw v) {        mediaPlayer.start();      }    });    bt_stop.setonClickListener(new VIEw.OnClickListener() {      @OverrIDe      public voID onClick(VIEw v) {        mediaPlayer.pause();      }    });  }  @OverrIDe  public voID surfaceCreated(SurfaceHolder holder) {    if (holder == surfaceHolder) {      mediaPlayer.setdisplay(holder);    }else if (holder == surfaceVIEw_danmuHolder) {      new MyDanMuThread().start();    }  }  @OverrIDe  public voID surfaceChanged(SurfaceHolder holder,int height) {  }  @OverrIDe  public voID surfaceDestroyed(SurfaceHolder holder) {  }  class MyDanMuThread extends Thread {    @OverrIDe    public voID run() {      super.run();      Paint paint = new Paint();      paint.setcolor(color.RED);      paint.setTextSize(40);      while (true) {        try {          Thread.sleep(200);        } catch (InterruptedException e) {          e.printstacktrace();        }        Canvas canvas = surfaceVIEw_danmuHolder.lockCanvas();        canvas.drawcolor(color.transparent,PorterDuff.Mode.CLEAR);        for (int i=0;i<List.size();i++) {          DanMu danMu = List.get(i);          x = danMu.getX();          danMu.setX(x+=10);          canvas.drawText(danMu.getText(),danMu.getX(),danMu.getY(),paint);        }        surfaceVIEw_danmuHolder.unlockCanvasAndPost(canvas);      }    }  }}

实现滚动歌词

要准备一个装有时间和歌词的集合，准备一个Timer计时器和一个该展示第几个歌词。每隔一秒去拿该歌词的下一个歌词时间与进度匹配，如果进度>=该时间，那么就画该歌词在SurfaceVIEw上；<则不画该歌词

一定要写SD卡读写权限！！！！！

public class MainActivity extends AppCompatActivity implements SurfaceHolder.Callback{  SurfaceVIEw surfaceVIEw;  SurfaceHolder surfaceHolder;  MediaPlayer mediaPlayer = new MediaPlayer();  ArrayList<Music> List=new ArrayList<>();  Timer timer;  int count = 0;  @OverrIDe  protected voID onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentVIEw(R.layout.activity_main);    surfaceVIEw = findVIEwByID(R.ID.sv);    surfaceHolder=surfaceVIEw.getHolder();    surfaceHolder.addCallback(this);    timer = new Timer();    timer.schedule(new TimerTask() {      @OverrIDe      public voID run() {        int currentposition = mediaPlayer.getCurrentposition();        if(List.size()>0){          if(currentposition>=List.get(count+1).getTime()){            count++;          }        }      }    },500);    try {      mediaPlayer.setDataSource("/sdcard/凤凰传奇 - 最炫民族风(live).mp3");      mediaPlayer.prepareAsync();      mediaPlayer.setonPreparedListener(new MediaPlayer.OnPreparedListener() {        @OverrIDe        public voID onPrepared(MediaPlayer mp) {          mediaPlayer.start();        }      });    } catch (IOException e) {      e.printstacktrace();    }    try {      StringBuffer stringBuffer = new StringBuffer();      fileinputStream fileinputStream = new fileinputStream("/sdcard/最炫民族风");      byte[] bytes = new byte[1024];      int len = 0;      while ((len=fileinputStream.read(bytes))!=-1) {        stringBuffer.append(new String(bytes,len));      }      Gson gson = new Gson();      JavaBean javaBean = gson.fromJson(stringBuffer.toString(),JavaBean.class);      JavaBean.LrcBean lrc = javaBean.getLrc();      String lyric = lrc.getLyric();      String[] split = lyric.split("\n");      for(int i=0;i<split.length;i++){        String trim = split[i].trim();        String[] split1 = trim.split("]");        if(split.length>=2){          String s = split1[0];          String substring1 = s.substring(1,3);          String substring2 = s.substring(4,6);          String substring3 = s.substring(7,10);          long start = Integer.parseInt(substring1)*60*1000+Integer.parseInt(substring2)*1000+Integer.parseInt(substring3);          String text = split1[1];          List.add(new Music(text,start));        }      }    } catch (fileNotFoundException e) {      e.printstacktrace();    } catch (IOException e) {      e.printstacktrace();    }  }  @OverrIDe  public voID surfaceCreated(SurfaceHolder holder) {    new MyThread().start();  }  @OverrIDe  public voID surfaceChanged(SurfaceHolder holder,int height) {  }  @OverrIDe  public voID surfaceDestroyed(SurfaceHolder holder) {  }  class MyThread extends Thread {    @OverrIDe    public voID run() {      super.run();      Paint paint = new Paint();      paint.setcolor(color.RED);      paint.setTextSize(50);      while (true){        try {          Thread.sleep(100);        } catch (InterruptedException e) {          e.printstacktrace();        }        Canvas canvas = surfaceHolder.lockCanvas();        if(canvas==null){          break;        }        canvas.drawcolor(color.transparent,PorterDuff.Mode.CLEAR);        if(List.size()>0){          canvas.drawText(List.get(count).getTitle(),100,paint);        }        surfaceHolder.unlockCanvasAndPost(canvas);      }    }  }}

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