Android以编程方式创建选择器 [英] Android create selector programmatically

问题描述

如何以编程方式创建选择器?
我有一个分配给TabWidget的Tab indicator color

How can i create selector programmatically?
i have a xml selector that assigned to TabWidget as Tab indicator color

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <!-- Non focused states -->
    <item android:state_focused="false" android:state_selected="false" android:state_pressed="false" android:drawable="@drawable/bg_tab_unselected" />
    <item android:state_focused="false" android:state_selected="true"  android:state_pressed="false" android:drawable="@drawable/bg_tab_selected" />

    <!-- Focused states -->
    <item android:state_focused="true" android:state_selected="false" android:state_pressed="false" android:drawable="@drawable/bg_tab_unselected_focused" />
    <item android:state_focused="true" android:state_selected="true"  android:state_pressed="false" android:drawable="@drawable/bg_tab_selected_focused" />

    <!-- Pressed -->
    <!--    Non focused states -->
    <item android:state_focused="false" android:state_selected="false" android:state_pressed="true" android:drawable="@drawable/bg_tab_unselected_pressed" />
    <item android:state_focused="false" android:state_selected="true"  android:state_pressed="true" android:drawable="@drawable/bg_tab_selected_pressed" />

    <!--    Focused states -->
    <item android:state_focused="true" android:state_selected="false" android:state_pressed="true" android:drawable="@drawable/bg_tab_unselected_pressed" />
    <item android:state_focused="true" android:state_selected="true"  android:state_pressed="true" android:drawable="@drawable/bg_tab_selected_pressed" />
</selector>

有什么方法可以动态创建上述xml代码?

Is there any way to create above xml code dynamically?

推荐答案

您可以像这样使用它:

public static StateListDrawable makeSelector(int color) {
    StateListDrawable res = new StateListDrawable();
    res.setExitFadeDuration(400);
    res.setAlpha(45);
    res.addState(new int[]{android.R.attr.state_pressed}, new ColorDrawable(color));
    res.addState(new int[]{}, new ColorDrawable(Color.TRANSPARENT));
    return res;
}

然后:

view.setBackground(makeSelector(Color.RED));

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