How can I know when an EditText loses focus in Android?

This example demonstrates how can I know when an EditText loses focus.
Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.
Step 2 − Add the following code to res/layout/activity_main.xml.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/parent"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity"
android:gravity="center"
android:orientation="vertical">
   <EditText
      android:id="@+id/editText"
      android:hint="Loosing focus example"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content" >
</EditText>
   <Button
      android:id="@+id/removeFocus"
      android:text="Remove Focus"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content" />
   <Button
      android:id="@+id/gainFocus"
      android:text="Gain Focus"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content" />
</LinearLayout>
In the above code, we have taken one edit text and two buttons. remove focus button going to remove the focus of edit text and other button going to gain focus of edit text.
Step 3 − Add the following code to src/MainActivity.java
package com.example.andy.myapplication;
import android.os.Build;
import android.os.Bundle;
import android.support.annotation.RequiresApi;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
   int view = R.layout.activity_main;
   EditText editText;
   Button removeFocus, gainFocus;
   @RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN)
   @Override
   protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(view);
      editText = findViewById(R.id.editText);
      removeFocus = findViewById(R.id.removeFocus);
      gainFocus = findViewById(R.id.gainFocus);
      gainFocus.setOnClickListener(new View.OnClickListener() {
         @Override
         public void onClick(View v) {
            editText.setFocusableInTouchMode(true);
            editText.setFocusable(true);
         }
      });
      removeFocus.setOnClickListener(new View.OnClickListener() {
         @Override
         public void onClick(View v) {
            editText.setFocusableInTouchMode(false);
            editText.setFocusable(false);
         }
      });
      editText.setOnFocusChangeListener(new View.OnFocusChangeListener() {
         @Override
         public void onFocusChange(View v, boolean hasFocus) {
            if (!hasFocus) {
               Toast.makeText(MainActivity.this, "focus loosed", Toast.LENGTH_LONG).show();
            } else {
               Toast.makeText(MainActivity.this, "focused", Toast.LENGTH_LONG).show();
            }
         }
      });
   }
}
In the above button, we have removed focus as shown below -
editText.setFocusableInTouchMode(false);
editText.setFocusable(false);
To gain focus use the following code -
editText.setFocusableInTouchMode(true);
editText.setFocusable(true);
To find the status of focus in edit text as shown below -
editText.setOnFocusChangeListener(new View.OnFocusChangeListener() {
   @Override
   public void onFocusChange(View v, boolean hasFocus) {
      if (!hasFocus) {
         Toast.makeText(MainActivity.this, "focus loosed", Toast.LENGTH_LONG).show();
      } else {
         Toast.makeText(MainActivity.this, "focused", Toast.LENGTH_LONG).show();
      }
   }
});
Let's try to run your application. I assume you have connected your actual Android Mobile device with your computer. To run the app from android studio, open one of your project's activity files and click Run   icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen −
In the above result, we have clicked on remove focus. it is showing a message as focus loosed(check cursor ). now click on gain focus, it will gain focus as shown below -
Click here to download the project code