Android switches - making thumb height larger than track height, how?

问题

Is there any way to make the height of the thumb of a switch bigger than the track height in Android versions prior to Lollipop ?

I am essentially trying to create a material design-like switch widget in Kitkat (and older versions- the problem here is the thumb by default 'fits' inside the track). I have been working on this for quite some time now but I can't seem to arrive at the correct design.

I followed the solutions on this SO post: How to change the size of a Switch Widget.

Any suggestions or a solution would be most appreciated.

回答1:

I added a transparent stroke to my track drawable shape which results in a padding around the track:

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
       android:shape="rectangle">
    <solid android:color="@color/track_color"/>
    <size android:height="@dimen/track_height"  />
    <size android:width="@dimen/track_width"  />

    <!-- results in the track looking smaller than the thumb -->
    <stroke
        android:width="6dp"
        android:color="#00ffffff"/>
</shape>

回答2:

Yup I solved this

 <android.support.v7.widget.SwitchCompat
                   android:id="@+id/mySwitch"
                   android:layout_width="wrap_content"
                   android:layout_height="wrap_content"
                   android:textOn="ON"
                   android:textOff="OFF"
                   style="@style/Color1SwitchStyle"
                   android:text="" />

This is My Color1SwitchStyle

 <style name="Color1SwitchStyle">
    <item name="android:thumb">@drawable/customswitchselector</item>
    <item name="android:track">@drawable/my_custom_track</item>
     //when use Switch in xml file 
    <item name="track">@drawable/my_custom_track</item>
    //when use android.support.v7.widget.SwitchCompat in xml

</style>

*Hear is my customswitchselector.xml

 <?xml version="1.0" encoding="utf-8"?>
    <selector xmlns:android="http://schemas.android.com/apk/res/android" >
      <item android:state_checked="true"
        android:drawable="@drawable/on" >
       <shape
            android:shape="rectangle"
            android:dither="true"
            android:useLevel="false"
            android:visible="true">

            <gradient
                android:startColor="#66AAFF00"
                android:endColor="#6600FF00"
                android:angle="270"/>
            <corners
                android:radius="15dp"/>

            <size
                android:width="200dp"
                android:height="80dp" />
            <stroke
                android:width="4dp"
                android:color="#0000ffff"/>
        </shape>
    </item>
    <item android:state_checked="false"
        android:drawable="@drawable/off">
        <shape
            android:shape="rectangle"
            android:dither="true"
            android:useLevel="false"
            android:visible="true">

            <gradient
                android:startColor="#66AAFF00"
                android:endColor="#6600FF00"
                android:angle="270"/>
            <corners
                android:radius="15dp"/>

            <size
                android:width="200dp"
                android:height="80dp" />
            <stroke
                android:width="4dp"
                android:color="#0000ffff"/>
        </shape>
    </item>

</selector>

And hear is magic my my_custom_track.xml

<?xml version="1.0" encoding="utf-8"?>
    <selector xmlns:android="http://schemas.android.com/apk/res/android">
        <item
            android:state_checked="true"
            android:state_enabled="true"
            android:drawable="@drawable/switch_track_on" />
        <item
            android:state_checked="false"
            android:state_enabled="false"
            android:drawable="@drawable/switch_track_off" />
    </selector> 





switch_track_on.xml 
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item>
        <shape
            android:shape="rectangle"
            android:dither="true"
            android:useLevel="false"
            android:visible="true">
            <gradient
                android:startColor="@color/profile_pic_bg"
                android:endColor="@color/profile_pic_bg"
                android:angle="270"/>
            <corners
                android:radius="0dp"/>
            <size
                android:width="100dp"
                android:height="10dp" />

            <stroke
                android:width="12dp"
                android:color="#00ffffff"/>
        </shape>
    </item>
</layer-list>



    switch_track_off.xml
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item>
        <shape
            android:shape="rectangle"
            android:dither="true"
            android:useLevel="false"
            android:visible="true">
            <gradient
                android:startColor="@color/gray"
                android:endColor="@color/gray"
                android:angle="270"/>
            <corners
                android:radius="0dp"/>
            <size
                android:width="100dp"
                android:height="10dp" />

            <stroke
                android:width="12dp"
                android:color="#00ffffff"/>
        </shape>
    </item>
</layer-list>

Thanks stevenp without your comment i cannot solve this

回答3:

The solution I came up with is just to use for the track a shape that is a line instead of a rectangle, and set the width explicitly in its stroke.

For example if the switch is defined as follows:

        <android.support.v7.widget.SwitchCompat
            android:id="@+id/my_switch"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            app:track="@drawable/switch_track"
            app:theme="@android:style/Theme.DeviceDefault.Light" />

The in the switch_track.xml drawable use a line shape with whatever width you desire:

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android" >
    <item android:state_checked="false" >
        <shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="line" >
            <stroke android:color="#50bbb9bf" android:width="5dp"/>
        </shape>
    </item>
    <item android:state_checked="true">
        <shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="line">
            <stroke android:color="#5000b6de" android:width="5dp"/>
        </shape>
    </item>
</selector>

来源：https://stackoverflow.com/questions/29115057/android-switches-making-thumb-height-larger-than-track-height-how