How can I validate EditText input in Android?

This example demonstrate about How can I validate EditText input in Android.

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.java

 xml version= "1.0" encoding= "utf-8" ?>

   

Step 3 − Add the following code to src/ValidateFilter.java

package app.tutorialspoint.com.sample ;
import android.text.InputFilter ;
import android.text.Spanned ;
import android.util.Log ;
import java.util.regex.Matcher ;
import java.util.regex.Pattern ;
public class ValidateFilter implements InputFilter {
   @Override
   public CharSequence filter (CharSequence source , int start , int end , Spanned dest ,
   int dstart , int dend) {
      for ( int i = start ; i 
Step 4 − Add the following code to src/MainActivity.java
package app.tutorialspoint.com.sample ;
import android.os.Bundle ;
import android.support.v7.app.AppCompatActivity ;
import android.text.InputFilter ;
import android.widget.EditText ;
public class MainActivity extends AppCompatActivity {
   @Override
   protected void onCreate (Bundle savedInstanceState) {
      super .onCreate(savedInstanceState) ;
      setContentView(R.layout. activity_main ) ;
      EditText editText = findViewById(R.id. editText ) ;
      editText.setFilters( new InputFilter[]{ new ValidateFilter()}) ;
   }
}
Step 5 − Add the following code to androidManifest.xml
 xml version= "1.0" encoding= "utf-8" ?>

   
   
      
         
            
            
         
      
   
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 –