setBackgroundResource和setBackgroundDrawable的區別是什麼

Question

誰能告訴我在android中setBackgroundResource(resourceid)和setBackgroundDrawable(getResource().getDrawable(drawableid))有什麼區別？

Answer 1

你可以親自看看Android source code for the View class，發現它們幾乎沒有區別！

public void setBackgroundResource(int resid) { 
    if (resid != 0 && resid == mBackgroundResource) { 
     return; 
    } 

    Drawable d= null; 
    if (resid != 0) { 
     d = mResources.getDrawable(resid); 
    } 
    setBackground(d); 

    mBackgroundResource = resid; 
} 

而且setBackground()只是通過對setBackgroundDrawable()調用...

public void setBackground(Drawable background) { 
    //noinspection deprecation 
    setBackgroundDrawable(background); 
}