android ImageView onTouchListener監聽的處理

    

 public OnTouchListener onTouch=new OnTouchListener(){

        @Override
        public boolean onTouch(View v, MotionEvent event) {
          
            switch(event.getAction()){
                case MotionEvent.ACTION_DOWN:
                    if(v.getId()==R.id.mImgReback){
                        mImgReback.setBackgroundDrawable(new BitmapDrawable(App_Common.allBitmap[zcMathGameRes.reback1_png]));
                    }
                    else if(v.getId()==R.id.mImgfrog){
                        mImgfrog.setAlpha(1f);
                    }else if(v.getId()==R.id.mImgBigOrSmall){
                        mImgBigOrSmall.setAlpha(1f);
                    }else if(v.getId()==R.id.mImgNumble){
                        mImgNumble.setAlpha(1f);
                    }else if(v.getId()==R.id.mImgGood){
                        mImgGood.setAlpha(1f);
                    }
                   
                    break;
                case MotionEvent.ACTION_UP:
                    if(v.getId()==R.id.mImgReback){
                        mImgReback.setBackgroundDrawable(new BitmapDrawable(App_Common.allBitmap[zcMathGameRes.reback0_png]));
                    }else if(v.getId()==R.id.mImgfrog){
                        mImgfrog.setAlpha(0.0f);
                    }else if(v.getId()==R.id.mImgBigOrSmall){
                        mImgBigOrSmall.setAlpha(0f);
                    }else if(v.getId()==R.id.mImgNumble){
                        mImgNumble.setAlpha(0f);
                    }else if(v.getId()==R.id.mImgGood){
                        mImgGood.setAlpha(0f);
                    }
                    break;
            }
            return true;
        }
       
       
    };

 

不知道為什么，如果是ImageView的OnTouchListener，onTouch方法要返回true，MotionEvent.ACTION_UP,MotionEvent.ACTION_MOVE 才有效。

其實關於返回true，false，true是不會再向外傳播，false：是向外傳播

android 傳播機制：最先觸發的是按鈕上綁定的監聽事件--->該組件提供的回調方法--->然后傳播到該組件所在的Activity。