Promemoria. Il codice dello "svitamento" nella mia applicazione.

Il codice di "apertura delle viti".
Lo salvo prima di modificarlo.

  screwOpen = new View.OnLongClickListener() {
   
   @Override
   public boolean onLongClick(View v) {
     Vibrator vib = (Vibrator) getApplicationContext().getSystemService(Context.VIBRATOR_SERVICE);
     // Vibrate for 500 milliseconds
     vib.vibrate(500); 
    if(v==leftTop && openFlag==0) {
     openFlag=1;
     if(settingMode==false) leftTop.setImageResource(R.drawable.unscrewed);
     else leftTop.setImageResource(R.drawable.screwed);
     
    }
    if(v==rightTop && openFlag==1) {
     openFlag=2; 
     if(settingMode==false) rightTop.setImageResource(R.drawable.unscrewed);
     else rightTop.setImageResource(R.drawable.screwed);
    }
    if(v==leftBottom && openFlag==2){
     openFlag=3;
     if(settingMode==false) leftBottom.setImageResource(R.drawable.unscrewed);
     else leftBottom.setImageResource(R.drawable.screwed);
    }
    if(v==rightBottom && openFlag==3) {
     if(settingMode==false){
      rightBottom.setImageResource(R.drawable.unscrewed);
      settingMode=true;
     
      
     } else
     {
      rightBottom.setImageResource(R.drawable.screwed);
      settingMode=false; 
      button.setVisibility(View.INVISIBLE);
      
     }

     openFlag=0;
    }
    return false;
   }
  };

Ho elaborato una forma "a chiusura rapida":

screwOpen = new View.OnLongClickListener() {
   
   @Override
   public boolean onLongClick(View v) {
     Vibrator vib = (Vibrator) getApplicationContext().getSystemService(Context.VIBRATOR_SERVICE);
     // Vibrate for 500 milliseconds
     vib.vibrate(500); 
     if(settingMode==false){
      if(v==leftTop && openFlag==0) {
       openFlag=1;
       Log.d("Openflag",openFlag+"");
       Log.d("settingMode",settingMode+"");
       leftTop.setImageResource(R.drawable.unscrewed);     
      }
      if(v==rightTop && openFlag==1) {
       openFlag=2; 
       Log.d("Openflag",openFlag+"");
       rightTop.setImageResource(R.drawable.unscrewed);
      }
      if(v==leftBottom && openFlag==2){
       openFlag=3;
       Log.d("Openflag",openFlag+"");
       leftBottom.setImageResource(R.drawable.unscrewed);
      }
      if(v==rightBottom && openFlag==3) { 
       Log.d("Openflag",openFlag+"");
      rightBottom.setImageResource(R.drawable.unscrewed);
      settingMode=true; 
      openFlag=0;
     } 
     
     } // fine di if(settingMode==false)
    
     else{
      leftTop.setImageResource(R.drawable.screwed);
      rightTop.setImageResource(R.drawable.screwed);
      leftBottom.setImageResource(R.drawable.screwed);
      rightBottom.setImageResource(R.drawable.screwed);
      settingMode=false;
     
     }
     
     return true;
   }
   
  };

Ma adesso devo lasciare spazio al "ripensamento"...

Eccolo (che faticaccia!)

  screwOpen = new View.OnLongClickListener() {
   
   @Override
   public boolean onLongClick(View v) {
     Vibrator vib = (Vibrator) getApplicationContext().getSystemService(Context.VIBRATOR_SERVICE);
     // Vibrate for 500 milliseconds
     vib.vibrate(500); 
    
     if(settingMode==false){
      if(v==leftTop) {
       if(openFlag==0){
        openFlag=1;
        leftTop.setImageResource(R.drawable.unscrewed);
       
       }
       else if(openFlag==1){
        openFlag=0;
        leftTop.setImageResource(R.drawable.screwed);
       }
            
      }
      if(v==rightTop) {
       if(openFlag==1){
        openFlag=2;
        rightTop.setImageResource(R.drawable.unscrewed);
       
       }
       else if(openFlag==2){
        openFlag=1;
        rightTop.setImageResource(R.drawable.screwed);
       }
      }
      if(v==leftBottom){
       if(openFlag==2){
        openFlag=3;
        leftBottom.setImageResource(R.drawable.unscrewed);
       
       }
       else if(openFlag==3){
        openFlag=2;
        leftBottom.setImageResource(R.drawable.screwed);
       }
      }
      if(v==rightBottom && openFlag==3) { 
      rightBottom.setImageResource(R.drawable.unscrewed);
      settingMode=true; 
      openFlag=0;
     } 
     
     } // fine di if(settingMode==false)
    
     else{
      leftTop.setImageResource(R.drawable.screwed);
      rightTop.setImageResource(R.drawable.screwed);
      leftBottom.setImageResource(R.drawable.screwed);
      rightBottom.setImageResource(R.drawable.screwed);
      settingMode=false;
     
     }
     
     return true;
   }
   
  };

...depurato di tutti i Log.d che ho usato per verificare i risultati in LogCat precedentemente.