How to Validate the Edit Text in Android Studio

Amir Ali
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Article

Introduction

In this article, you will learn how to validate edit text in Android.

Validation

Validation is a process to ensure that the value entered by the user is within the accepted boundaries of the application. For example, if a user enters a name then the programmer validates the edit text in such a way that it consists of only letters but no numeric values.

Step 1

Create a new project.

Step 2

Now open the XML file:

<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"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
tools:context=".MainActivity">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:orientation="horizontal" android:id="@+id/linearLayout2">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Person_Name"
android:id="@+id/textView1"
android:layout_gravity="center_horizontal|top"
android:layout_alignParentTop="true"
android:layout_toRightOf="@+id/linearLayout2"/>
<EditText
android:layout_width="200dp"
android:layout_height="wrap_content"
android:inputType="textPersonName"
android:text=""
android:id="@+id/editText1"
android:layout_gravity="center_horizontal|top"
android:layout_alignTop="@+id/linearLayout2"
android:layout_alignParentRight="true"/>
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="80dp"
android:orientation="horizontal" android:id="@+id/linearLayout">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="word"
android:id="@+id/textView"
android:layout_gravity="center_horizontal|top"
android:layout_alignParentTop="true"
android:layout_toRightOf="@+id/linearLayout2"/>
<EditText
android:layout_width="200dp"
android:layout_height="wrap_content"
android:inputType=""
android:text=""
android:id="@+id/editText2"
android:layout_marginLeft="40dp" android:layout_gravity="center_horizontal|top"
android:layout_alignTop="@+id/linearLayout2"
android:layout_alignParentRight="true"/>
</LinearLayout>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Register"
android:id="@+id/button"
android:layout_below="@+id/linearLayout"
android:layout_centerHorizontal="true"
android:layout_marginTop="31dp"/>
>
</RelativeLayout>

Step 3

package com.edittextvalidation;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends Activity {
EditText NameEditText,editTextPhoneNumber,wordEditText;
TextView textViewName,textViewAge,textViewword;
Button RegistrationButton;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
RegistrationButton=(Button)findViewById(R.id.button);
NameEditText=(EditText)findViewById(R.id.editText1);
wordEditText=(EditText)findViewById(R.id.editText2);
RegistrationButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
final String Name=NameEditText.getText().toString();
final String word=wordEditText.getText().toString();
if(Name.length()==0)
{
NameEditText.requestFocus();
NameEditText.setError("FIELD CANNOT BE EMPTY");
}
else if(!Name.matches("[a-zA-Z ]+"))
{
NameEditText.requestFocus();
NameEditText.setError("ENTER ONLY ALPHABETICAL CHARACTER");
}
else if(word.length()==0)
{
wordEditText.requestFocus();
wordEditText.setError("FIELD CANNOT BE EMPTY");
}
else
{
Toast.makeText(MainActivity.this,"Validation Successful",Toast.LENGTH_LONG).show();
}
}
});
}
}