Android setButtonDrawable()的兼容問題解決辦法
setButtonDrawable()的兼容問題
API16實現(xiàn)
/** * Set the background to a given Drawable, identified by its resource id. * * @param resid the resource id of the drawable to use as the background */ public void setButtonDrawable(int resid) { if (resid != 0 && resid == mButtonResource) { return; } mButtonResource = resid; Drawable d = null; if (mButtonResource != 0) { d = getResources().getDrawable(mButtonResource); } setButtonDrawable(d); } /** * Set the background to a given Drawable * * @param d The Drawable to use as the background */ public void setButtonDrawable(Drawable d) { if (d != null) { if (mButtonDrawable != null) { mButtonDrawable.setCallback(null); unscheduleDrawable(mButtonDrawable); } d.setCallback(this); d.setState(getDrawableState()); d.setVisible(getVisibility() == VISIBLE, false); mButtonDrawable = d; mButtonDrawable.setState(null); setMinHeight(mButtonDrawable.getIntrinsicHeight()); } refreshDrawableState(); }API23實現(xiàn)
/** * Sets a drawable as the compound button image given its resource * identifier. * * @param resId the resource identifier of the drawable * @attr ref android.R.styleable#CompoundButton_button */ public void setButtonDrawable(@DrawableRes int resId) { final Drawable d; if (resId != 0) { d = getContext().getDrawable(resId); } else { d = null; } setButtonDrawable(d); } /** * Sets a drawable as the compound button image. * * @param drawable the drawable to set * @attr ref android.R.styleable#CompoundButton_button */ @Nullable public void setButtonDrawable(@Nullable Drawable drawable) { if (mButtonDrawable != drawable) { if (mButtonDrawable != null) { mButtonDrawable.setCallback(null); unscheduleDrawable(mButtonDrawable); } mButtonDrawable = drawable; if (drawable != null) { drawable.setCallback(this); drawable.setLayoutDirection(getLayoutDirection()); if (drawable.isStateful()) { drawable.setState(getDrawableState()); } drawable.setVisible(getVisibility() == VISIBLE, false); setMinHeight(drawable.getIntrinsicHeight()); applyButtonTint(); } } }結(jié)論
RadioButton和CheckBox都是Android app中常用的Widget，它們派生于CompoundButton，允許使用者自行設(shè)置背景和按鈕的樣式，不過，有時我們僅希望簡單的設(shè)置一個有狀態(tài)的背景，并隱藏其默認樣式。可是，當我們調(diào)用setButtonDrawable(null)或setButtonDrawable(0)時，卻發(fā)現(xiàn)完全沒有效果。原來，CompoundButton的setButtonDrawable的代碼實現(xiàn)中屏蔽了null或resid為0的Drawable，迫使我們必須傳入有效的Drawable對象。
這時候，透明顏色就可以派上用場了：
button.setButtonDrawable(new ColorDrawable(Color.TRANSPARENT));
參考：
隱藏RadioButton, CheckBox圖片 setButtonDrawable：
RadioButton和CheckBox都是Android app中常用的Widget，它們派生于CompoundButton，允許使用者自行設(shè)置背景和按鈕的樣式，不過，有時我們僅希望簡單的設(shè)置一個有狀態(tài)的背景，并隱藏其默認樣式。可是，當我們調(diào)用setButtonDrawable(null)或setButtonDrawable(0)時，卻發(fā)現(xiàn)完全沒有效果。原來，CompoundButton的setButtonDrawable的代碼實現(xiàn)中屏蔽了null或resid為0的Drawable，迫使我們必須傳入有效的Drawable對象。
這時候，透明顏色就可以派上用場了：
button.setButtonDrawable(new ColorDrawable(Color.TRANSPARENT));
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