Android switch button example

A switch is type of button that can only have two states ON and OFF. You can set the initial state and then the user can change it. To get the current state you can check if the switch is checked or not, in addition to that you can attach a OnCheckedChangeListener to the switch to get notification when the state changes.

Android Screen Layout

<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=".MainActivity"
    android:padding="5dp">

    <Switch
        android:id="@+id/mySwitch"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginTop="20dp"
        android:text="Play with the Switch" />

    <TextView
        android:id="@+id/switchStatus"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_below="@+id/mySwitch"
        android:layout_marginTop="22dp"
        android:text="Medium Text"
        android:textAppearance="?android:attr/textAppearanceMedium" />
    
</RelativeLayout>

Android Main Activity

package com.as400samplecode; import android.os.Bundle; import android.app.Activity; import android.view.Menu; import android.widget.CompoundButton; import android.widget.CompoundButton.OnCheckedChangeListener; import android.widget.Switch; import android.widget.TextView; public class MainActivity extends Activity {  private TextView switchStatus;  private Switch mySwitch;  @Override  protected void onCreate(Bundle savedInstanceState) {   super.onCreate(savedInstanceState);   setContentView(R.layout.activity_main);   switchStatus = (TextView) findViewById(R.id.switchStatus);   mySwitch = (Switch) findViewById(R.id.mySwitch);   //set the switch to ON   mySwitch.setChecked(true);   //attach a listener to check for changes in state   mySwitch.setOnCheckedChangeListener(new OnCheckedChangeListener() {    @Override    public void onCheckedChanged(CompoundButton buttonView,      boolean isChecked) {     if(isChecked){      switchStatus.setText("Switch is currently ON");     }else{      switchStatus.setText("Switch is currently OFF");     }    }   });      //check the current state before we display the screen   if(mySwitch.isChecked()){    switchStatus.setText("Switch is currently ON");   }   else {    switchStatus.setText("Switch is currently OFF");   }  }  @Override  public boolean onCreateOptionsMenu(Menu menu) {   // Inflate the menu; this adds items to the action bar if it is present.   getMenuInflater().inflate(R.menu.activity_main, menu);   return true;  } }