Android学习 之 ColorStateList按钮文字变色
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:
- <?xml version="1.0" encoding="utf-8"?>
- <selector xmlns:android="http://schemas.android.com/apk/res/android">
- <item android:state_pressed="true"
- android:color="#ffff0000"/> <!-- pressed -->
- <item android:state_focused="true"
- android:color="#ff0000ff"/> <!-- focused -->
- <item android:color="#ff000000"/> <!-- default -->
- </selector>
- Button btn=(Button)findViewById(R.id.btn);
- Resources resource=(Resources)getBaseContext().getResources();
- ColorStateList csl=(ColorStateList)resource.getColorStateList(R.color.button_text);
- if(csl!=null){
- btn.setTextColor(color_state_list);//设置按钮文字颜色
- }
或者可以这样:
- XmlResourceParser xpp=Resources.getSystem().getXml(R.color.button_text);
- try {
- ColorStateList csl= ColorStateList.createFromXml(getResources(),xpp);
- btn.setTextColor(csl);
- } catch (Exception e) {
- // TODO: handle exception
- }
最后附上所有可能出现的状态:
- <?xml version="1.0" encoding="utf-8"?>
- <selector xmlns:android="http://schemas.android.com/apk/res/android" >
- <item
- android:color="hex_color"
- android:state_pressed=["true" | "false"]
- android:state_focused=["true" | "false"]
- android:state_selected=["true" | "false"]
- android:state_active=["true" | "false"]
- android:state_checkable=["true" | "false"]
- android:state_checked=["true" | "false"]
- android:state_enabled=["true" | "false"]
- android:state_window_focused=["true" | "false"] />
- </selector>