3. Android articles-how to change the color of the android button touch and the default color

problem:

Sometimes we need to set a click effect for the button when laying out, that is, the default is a color, and the finger is put on it is another color. This effect can be done as follows:

1. This is the layout of the button

 <RelativeLayout
                android:layout_width="155dp"
                android:layout_height="53dp"
                android:layout_gravity="center_horizontal"
                android:layout_marginBottom="27dp"
                android:background="@drawable/btn_common"
                android:onClick="startAnswer">

                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_centerInParent="true"
                    android:text="开始测试"
                    android:textColor="#FFFFFF"
                    android:textSize="19sp" />
            </RelativeLayout>

In the background file of the layout, we write:

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:drawable="@drawable/btn_color_bg_hover" android:state_focused="true" /><!--点击状态是颜色-->
    <item android:drawable="@drawable/btn_color_bg_hover" android:state_pressed="true" /><!--默认颜色-->
    <item android:drawable="@drawable/btn_color_bg" />
</selector><!--触摸状态时颜色-->

The content of btn_color_bg_hover.xml is as follows:

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
    <solid android:color="#FFFFFF" />
    <!-- 设置圆角 -->
    <corners android:radius="23dp" />
    <!-- 设置边框 -->
    <stroke
        android:width="1px"
        android:color="#efefef" />
    <!--left to right-->
    <gradient
        android:angle="45"
        android:endColor="#6ba0fe"
        android:startColor="#44e8ff" />

</shape>

The content of btn_color_bg.xml is as follows:

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
    <solid android:color="#FFFFFF" />
    <!-- 设置圆角 -->
    <corners android:radius="23dp" />
    <!-- 设置边框 -->
    <stroke
        android:width="1px"
        android:color="#efefef" />
    <!--left to right-->
    <gradient
        android:angle="45"
        android:endColor="#5489e7"
        android:startColor="#2cc9df" />

</shape>

In this way, when we click, we separate the styles of the two layout files