Android 动态创建Drawable selector

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创建selector有两种方法，一种是定义xml文件,一种是创建StateListDrawable对象，完全可以用创建StateListDrawable来代替xml，它的好处是可以在程序运行时动态的调整背景颜色或者背景图片。

一.xml创建selector方法如下：
定义一个switch_selector.xml

<?xml version="1.0" encoding="utf-8"?><selector xmlns:android="http://schemas.android.com/apk/res/android">    <item android:drawable="@drawable/switch_bg_disabled_emui" android:state_enabled="false"/>    <item android:drawable="@drawable/switch_bg_on_emui" android:state_pressed="true"/>    <item android:drawable="@drawable/switch_bg_on_emui" android:state_focused="true"/>    <item android:drawable="@drawable/switch_bg_on_emui" android:state_checked="true"/>    <item android:drawable="@drawable/switch_bg_off_emui"/></selector>

在Activity按下面方法使用

Drawable drawable = getResourse().getDrawable(R.drawable.switch_selector);ImageView iv = new ImageView(this);iv.setBackground(drawable);

二.用StateListDrawable来代替xml创建selector:

        private StateListDrawable createDrawableSelector(Context context)        {            Drawable checked = context.getResources().getDrawable(R.drawable.switch_bg_on_emui);            Drawable unchecked = context.getResources().getDrawable(R.drawable.switch_bg_off_emui);            Drawable disabled = context.getResources().getDrawable(R.drawable.switch_bg_disabled_emui);            StateListDrawable stateList = new StateListDrawable();            int statePressed = android.R.attr.state_pressed;            int stateChecked = android.R.attr.state_checked;            int stateFocused = android.R.attr.state_focused;            int stateensable = android.R.attr.state_enabled;            stateList.addState(new int[] {-stateensable}, disabled);            stateList.addState(new int[] {stateChecked}, checked);            stateList.addState(new int[] {statePressed}, checked);            stateList.addState(new int[] {stateFocused}, checked);            stateList.addState(new int[] {}, unchecked);            return stateList;        }

其中stateList.addState（）表示一个状态对应一个Drawable,在Activity里面按下面方法使用

Drawable drawable = createDrawableSelector(this);ImageView iv = new ImageView(this);iv.setBackground(drawable);

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