聚焦和失焦

1.效果图：

2.activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.app2.MainActivity"
    android:orientation="vertical">

    <EditText
        android:id="@+id/tv1"
        android:hint="hello1"
        android:textColor="@drawable/et_state"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
    <EditText
        android:id="@+id/tv2"
        android:hint="hello2"
        android:textColor="@drawable/et_state"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
</LinearLayout>

3.et_state.xml

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