聚焦和失焦

1.效果图：

2.activity_main.xml

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     xmlns:tools="http://schemas.android.com/tools"
 4     android:layout_width="match_parent"
 5     android:layout_height="match_parent"
 6     android:paddingBottom="@dimen/activity_vertical_margin"
 7     android:paddingLeft="@dimen/activity_horizontal_margin"
 8     android:paddingRight="@dimen/activity_horizontal_margin"
 9     android:paddingTop="@dimen/activity_vertical_margin"
10     tools:context="com.example.app2.MainActivity"
11     android:orientation="vertical">
12 
13     <EditText
14         android:id="@+id/tv1"
15         android:hint="hello1"
16         android:textColor="@drawable/et_state"
17         android:layout_width="match_parent"
18         android:layout_height="wrap_content" />
19     <EditText
20         android:id="@+id/tv2"
21         android:hint="hello2"
22         android:textColor="@drawable/et_state"
23         android:layout_width="match_parent"
24         android:layout_height="wrap_content" />
25 </LinearLayout>

3.et_state.xml

1 <?xml version="1.0" encoding="utf-8"?>
2 <selector xmlns:android="http://schemas.android.com/apk/res/android">
3     <item android:state_focused="true" android:color="@color/colorPrimary"></item>
4     <item android:state_focused="false" android:color="@color/colorAccent"></item>
5 </selector>