Click events of the Button in the Android learning notes switch to click images,

Click events of the Button in the Android learning notes switch to click images,

<RelativeLayout 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=".MainActivity" >    <Button        android:id="@+id/button1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentTop="true"        android:layout_centerHorizontal="true"        android:layout_marginTop="184dp"        android:background="@drawable/button_selector" /></RelativeLayout>

Android: background = "@ drawable/button_selector"

(2) Create the drawable folder under the res folder and create a selector File

<?xml version="1.0" encoding="utf-8"?><selector xmlns:android="http://schemas.android.com/apk/res/android">    <item android:drawable="@drawable/q" android:state_pressed="true"></item>    <item android:drawable="@drawable/w" android:state_focused="true"></item>    <item android:drawable="@drawable/e"></item></selector>

Put three images in the folder to change the image when switching

(3) Other content does not need to be changed

The file image changes as the button is clicked.