按钮文字选中与点击变动色

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bt_add.setBackgroundResource(R.drawable.detail_addbt_bg);
   bt_add.setText(getString(R.string.add));

   ColorStateList cl = null;
   try {
    XmlResourceParser xpp = getResources().getXml(R.color.black_white_text_color);
    cl = ColorStateList.createFromXml(getResources(), xpp);
    bt_add.setTextColor(cl);
   } catch (Exception e) {DebugLog.d(TAG, e.getMessage());}

////////R.color.black_white_text_color 放在：res/color/black_white_text_color.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="#000000" />
    <item android:state_pressed="false" android:state_focused="false" android:color="#ffffff" />
    <item android:state_focused="true" android:color="#000000" />
    <item android:state_focused="false" android:color="#ffffff"/>
</selector>