上週使用Android的switch模仿iOS的左右滑動開關控制元件，程式碼如下：

aty_switch.xml:

<?xml version="1.0" encoding="utf-8"?>
<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"
    tools:context="com.example.suhongwei897.learnandroid.aty.AtySwitch">
        
        <Switch
            android:id="@+id/mySwitch"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerInParent="true"
            android:switchMinWidth="30dp"
            android:textOff=""
            android:textOn=""
            android:thumb="@drawable/thumb"
            android:thumbTextPadding="16dp"
            android:track="@drawable/track" />

</RelativeLayout>
 

track.xml:

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

track_on.xml:

<?xml version="1.0" encoding="utf-8"?>
<shape
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
    <solid
        android:color="#EB520E" />
    <size android:width="40dp"
        android:height="30dp"/>
    <corners
        android:radius="15dp"/>
</shape>
 

<?xml version="1.0" encoding="utf-8"?>
<shape
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
    <solid
        android:color="#bdbdbd" />
    <size android:width="40dp"
        android:height="30dp"/>
    <corners
        android:radius="15dp"/>
</shape>

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

thumb_on.xml:

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="oval">
    <solid android:color="@android:color/white" />
    <stroke
        android:width="1dp"
        android:color="#EB520E" />
    <size
        android:width="30dp"
        android:height="30dp" />
</shape>

thumb_off.xml:

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="oval">
    <solid android:color="@android:color/white" />
    <stroke
        android:width="1dp"
        android:color="#bdbdbd" />
    <size
        android:width="30dp"
        android:height="30dp" />
</shape>

AtySwitch.class:

mySwitch = (Switch) findViewById(R.id.mySwitch);
mySwitch.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
    @Override
    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
        mySwitch.setSelected(isChecked);
    }
});

以下兩個值都是需要設定的：

android:switchMinWidth="30dp"   

android:thumbTextPadding="16dp"