Android setButtonDrawable()的兼容问题解决办法

setButtonDrawable()的兼容问题

API16实现

/** * 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实现

/** * 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(); } } }

结论

RadioButton和CheckBox都是Android app中常用的Widget，它们派生于CompoundButton，允许使用者自行设置背景和按钮的样式，不过，有时我们仅希望简单的设置一个有状态的背景，并隐藏其默认样式。可是，当我们调用setButtonDrawable(null)或setButtonDrawable(0)时，却发现完全没有效果。原来，CompoundButton的setButtonDrawable的代码实现中屏蔽了null或resid为0的Drawable，迫使我们必须传入有效的Drawable对象。

这时候，透明颜色就可以派上用场了：

button.setButtonDrawable(new ColorDrawable(Color.TRANSPARENT));

参考：

隐藏RadioButton, CheckBox图片 setButtonDrawable：

RadioButton和CheckBox都是Android app中常用的Widget，它们派生于CompoundButton，允许使用者自行设置背景和按钮的样式，不过，有时我们仅希望简单的设置一个有状态的背景，并隐藏其默认样式。可是，当我们调用setButtonDrawable(null)或setButtonDrawable(0)时，却发现完全没有效果。原来，CompoundButton的setButtonDrawable的代码实现中屏蔽了null或resid为0的Drawable，迫使我们必须传入有效的Drawable对象。

这时候，透明颜色就可以派上用场了：

button.setButtonDrawable(new ColorDrawable(Color.TRANSPARENT));

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