Android TouchDelegate --- define View touch area

TouchDelegate is used to expand the touch area of view

final View parent = (View) delegate.getParent();
parent.post( new Runnable() { 
       public void run() { 
        final Rect r = new Rect(); 
        view.getHitRect(r); 
        r.top -= topbound;  
        r.bottom += bottombound;   
        r.left -= leftbound;  
        r.right += righttopbound;  
        parent.setTouchDelegate( new TouchDelegate( r , view)); 
      } 
}); 

Android Formatting strings declare

declare string format

<string name="msg">Hello, %1$s! You have %2$d messages.</string>

%[position]$[type]

Using in code:

String.format(getResource().getString(R.string.msg), name, count);

Android dp and px換算

換算公式 target px = mdpi px * ( target dpi / 160 )
為了符合原本長度
dpi高的時候要比低dpi時用更多px表示 Android API: 直接從res/dimen換成px

int px = (int) getResources().getDimension(R.dimen.XXX)

數字轉換

TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, 20, r.getDisplayMetrics())