單選按鈕的Android操作

Question

我目前正在嘗試使我的項目，以便當其中一個單選按鈕被選中，並且按鈕被按住時，它會產生選定的聲音。但是當我使用ACTION_DOWN函數時，不會產生噪音。任何幫助將是巨大的

public boolean onTouch(View v, MotionEvent event) { 
    int frequency = Integer.parseInt(frequencyInput.getText().toString()); 
    displayFrequency.setText(String.valueOf(frequency)); 
    sineWave.setSine(frequency); 
    squareWave.setSquareWave(frequency); 
    sawWave.setSawWave(frequency); 
    boolean on = ((startStop.isPressed()) && sine.isChecked()); 
    boolean sqOn = ((startStop.isPressed()) && square.isChecked()); 
    boolean sawOn =((startStop.isPressed()) && saw.isChecked()); 
    switch (event.getAction()) { 
     case MotionEvent.ACTION_DOWN: 
      if (on) 
      { 
       sineWave.start(); 
      } 
      else if (sqOn) 
       { 
       squareWave.start(); 
       } 

      else if (sawOn) 
        { 
       sawWave.start(); 
      } 
      break; 

     case MotionEvent.ACTION_UP: 
      if (!on) { 
       sineWave.stop(); 
      } 
      if (!sqOn) { 
       squareWave.stop(); 
      } 
      if (!sawOn) { 
       sawWave.stop(); 
       ; 
      } 
      break; 


      } 

Answer 1

主要的問題是，你檢查isPressed()而你還在onTouch，使按鍵的按下狀態還沒有確定呢。

如果您將onTouchListener直接添加到startStop按鈕，您可以確保每次調用它時都會觸發該事件的startStop按鈕。這允許您刪除startStop.isPressed()檢查。

startStop.setOnTouchListener(new View.OnTouchListener() { 
     @Override 
     public boolean onTouch(View v, MotionEvent event) { 
      int frequency = Integer.parseInt(frequencyInput.getText().toString()); 
      displayFrequency.setText(String.valueOf(frequency)); 
      sineWave.setSine(frequency); 
      squareWave.setSquareWave(frequency); 
      sawWave.setSawWave(frequency); 
      boolean on = sine.isChecked(); 
      boolean sqOn = square.isChecked(); 
      boolean sawOn = saw.isChecked(); 
      switch (event.getAction()) { 
       case MotionEvent.ACTION_DOWN: 
        if (on) { 
         sineWave.start(); 
        } else if (sqOn) { 
         squareWave.start(); 
        } else if (sawOn) { 
         sawWave.start(); 
        } 
        break;  
       case MotionEvent.ACTION_UP: 
        if (!on) { 
         sineWave.stop(); 
        } 
        if (!sqOn) { 
         squareWave.stop(); 
        } 
        if (!sawOn) { 
         sawWave.stop(); 
        } 
        break; 
       default: 
        return false; 
      } 
      return true; 
     } 
    });