Windows平台VC，对于不同的按钮状态，采用不同的颜色显示文字，实现起来比较复杂，一般都得自绘按钮。但是Android里面实现起来非常方便。
我们首先添加一个ColorStateList资源XML文件，XML文件保存在res/color/button_text.xml:
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<?xml version="1.0" encoding="utf-8"?>
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<selector xmlns:android="http://schemas.android.com/apk/res/android">
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<item android:state_pressed="true"
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android:color="#ffff0000"/> <!-- pressed -->
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<item android:state_focused="true"
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android:color="#ff0000ff"/> <!-- focused -->
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<item android:color="#ff000000"/> <!-- default -->
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</selector>
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Button btn=(Button)findViewById(R.id.btn);
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Resources resource=(Resources)getBaseContext().getResources();
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ColorStateList csl=(ColorStateList)resource.getColorStateList(R.color.button_text);
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if(csl!=null){
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btn.setTextColor(color_state_list);
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}
或者可以这样：
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XmlResourceParser xpp=Resources.getSystem().getXml(R.color.button_text);
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try {
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ColorStateList csl= ColorStateList.createFromXml(getResources(),xpp);
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btn.setTextColor(csl);
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} catch (Exception e) {
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}
最后附上所有可能出现的状态：
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<?xml version="1.0" encoding="utf-8"?>
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<selector xmlns:android="http://schemas.android.com/apk/res/android" >
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<item
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android:color="hex_color"
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android:state_pressed=["true" | "false"]
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android:state_focused=["true" | "false"]
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android:state_selected=["true" | "false"]
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android:state_active=["true" | "false"]
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android:state_checkable=["true" | "false"]
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android:state_checked=["true" | "false"]
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android:state_enabled=["true" | "false"]
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android:state_window_focused=["true" | "false"] />
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</selector>
