Android - 淡入淡出圖像按鈕點擊

Question

我在佈局中有一個圖像按鈕，並實現相同的onclick功能。現在，我想在「點擊」期間淡入圖像按鈕。如何在android中以編程方式淡入圖像。提前致謝。

Answer 1

您需要在按鈕上實現動畫。您必須擁有包含alpha元素的View動畫。閱讀此：http://developer.android.com/guide/topics/resources/animation-resource.html，如果你需要任何幫助，請在這裏寫...

Answer 2

像這樣（我還沒有測試過，但應該工作），但你需要有「淡化」版本的ImageButton drawable。

Bitmap iconOn = BitmapFactory.decodeResource(context.getResources(), R.drawable.icon_on);//this should be yours faded button image 
Bitmap iconOff = BitmapFactory.decodeResource(context.getResources(), R.drawable.icon_off); //and this will be normal image 

Drawable iconOnDrawable = new BitmapDrawable(iconOn); 
Drawable iconOffDrawable = new BitmapDrawable(iconOff); 

StateListDrawable states = new StateListDrawable(); 
states.addState(new int[] { android.R.attr.state_pressed },iconOnDrawable); 
states.addState(new int[] { android.R.attr.state_focused },iconOffDrawable); 
states.addState(new int[] { android.R.attr.state_selected },iconOnDrawable); 
states.addState(new int[] {}, iconOffDrawable); 

ImageButton imageButton = (ImageButton) findViewById(R.id.button); 
imageButton.setImageDrawable(states); 

Answer 3

這種方式是你怎麼做：

Button b = view.findViewById(R.id.button); 
    final TransitionDrawable td = new TransitionDrawable(new Drawable[]{new ColorDrawable(0xFFFF0000), new ColorDrawable(0x11FF0000)}); 
    b.setOnTouchListener(new View.OnTouchListener() { 

    @Override 
    public boolean onTouch(View v, MotionEvent event) { 
     if(event.getActionMasked() == MotionEvent.ACTION_DOWN) { 
      //b.setBackgroundColor(); 
     } 
     if(event.getActionMasked() == MotionEvent.ACTION_UP) { 
      b.setBackgroundDrawable(td); 
      td.startTransition(1000); 
     } 
     return false; 
    } 
});