Surfaceview plays video, sends barrage and scrolls lyrics

In this paper, an example is given to share with you that surfaceview plays video, sends bullet screen, and realizes rolling lyrics for your reference. The specific contents are as follows

To use surfaceview

To use surfaceview:

SurfaceHolder

The surfaceholder callback has three lifecycles:

Surfaceview plays video and can send barrage

Two surfaceviews need to be prepared, one is responsible for playing video and the other is responsible for displaying barrage. The barrage is displayed on the video, so we need to set two methods for the surfaceview displaying the barrage: surfaceview_ danmu.setZOrderOnTop(true); —— Place surfaceview above_ danmuHolder.setFormat(PixelFormat.TRANSPARENT); —— Background transparency

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);
      }
    }
  }
}

Achieve scrolling lyrics

To prepare a collection of time and lyrics, prepare a timer timer and a number of lyrics to show. Get the next lyrics of the lyrics every second. The time matches the progress. If the progress > = the time, draw the lyrics on the surfaceview< Do not draw the lyrics

Be sure to write SD card read / write permission!!!!!

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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