Amandeep Chugh Amandeep Chugh - 3 months ago 30
Android Question

Android Using layer-list for button selector

How do we use a layer-list as a drawable for a button.
I have a button:


<item android:state_pressed="true">
<shape>
<gradient android:endColor="@color/white"
android:startColor="@color/grey_blue_light" android:angle="90" />
<stroke android:width="1dp" android:color="@color/aqua_blue" />
<corners android:radius="3dp" />
<padding android:left="10dp" android:top="10dp"
android:right="10dp" android:bottom="10dp" />
</shape>
</item>


<item android:state_focused="true">

</item>
<item>

</item>




Now I need a layer-list to be used as a shape when say button state is pressed:

<?xml version="1.0" encoding="UTF-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape android:shape="oval">
<solid android:color="@color/aqua_blue" />
</shape>
</item>
<item android:top="1dp" android:left="1dp" android:right="1dp" android:bottom="1dp">
<shape android:shape="oval">
<solid android:color="@color/aqua_blue" />
</shape>
</item>




How do we use this layer list in the button selector?

Answer

Step-1 create three different layer_list xml under drawable folder for three different state of button. example the name of those xml is layer1.xml, layer2.xml, layer3.xml

<?xml version="1.0" encoding="utf-8"?>
<layer-list
    xmlns:android="http://schemas.android.com/apk/res/android"
    >
    <item>
        <shape
            xmlns:android="http://schemas.android.com/apk/res/android"
            android:shape="rectangle"
            >

            <gradient
                android:angle="270"
                android:startColor="#0000ff"
                android:endColor="#0000dd"
                android:type="linear"
                />    
        </shape>
    </item>

</layer-list>

Step-2 create a selector xml named as btn_background.xml and pass the layer_list xml in drawable attribute

<selector
    xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:state_pressed="true" android:drawable="@drawable/layer1">

    </item>

    <item android:state_focused="true" android:drawable="@drawable/layer2">

    </item>

    <item android:drawable="@drawable/layer3">        

    </item>
</selector>

step-3 Set the selector xml as background of the button android:background="@drawable/btn_background"

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