How to create a Dialog Box without a title in Android?

This example demonstrates how to create a Dialog Box without a title 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.xml.

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:app="http://schemas.android.com/apk/res-auto"
   xmlns:tools="http://schemas.android.com/tools"
   android:id="@+id/RelativeLayout01"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   tools:context=".Dialog">
   <EditText android:id="@+id/EditText01" android:text="AlertDialog Demo"
      android:layout_height="50dip" android:layout_width="180dip">
   </EditText>
   <Button android:id="@+id/Button01" android:layout_width="wrap_content"
      android:layout_height="wrap_content" android:layout_below="@+id/EditText01"
      android:text="Clear Data">
   </Button>
</RelativeLayout>

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

package com.example.sample;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
public class Dialog extends AppCompatActivity {
   Button Clear;
   EditText edit_data;
   @Override
   protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      Clear=(Button)findViewById(R.id.Button01);
      edit_data=(EditText)findViewById(R.id.EditText01);
      Clear.setOnClickListener(new OnClickListener() {
         @Override
         public void onClick(View v) {
            // TODO Auto-generated method stub
            AlertDialog.Builder builder=new AlertDialog.Builder(Dialog.this);
            //Set a title
            builder.setTitle("Confirm");
            //Set a message
            builder.setMessage("Do you want to Clear?");
            builder.setPositiveButton("OK",new DialogInterface.OnClickListener() {
               @Override
               public void onClick(DialogInterface dialog, int which) {
                  // TODO Auto-generated method stub
                  //clearing the contents of edittext on click of OK button
                  edit_data.setText("");
                  //Displaying a toast message
                  Toast.makeText(getApplicationContext(), "Your text has been cleared", Toast.LENGTH_LONG).show();
               }
            });
            builder.setNegativeButton("Cancel",new DialogInterface.OnClickListener() {
               @Override
               public void onClick(DialogInterface dialog, int which) {
                  // TODO Auto-generated method stub
                  dialog.cancel();
               }
            });
            //Create the dialog
            AlertDialog alertdialog=builder.create();
            //show the alertdialog
            alertdialog.show();
         }
      });
   }
}

Step 4  − Add the following code to Manifests/AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
   package="com.example.sample">
   <application
      android:allowBackup="true"
      android:icon="@mipmap/ic_launcher"
      android:label="@string/app_name"
      android:roundIcon="@mipmap/ic_launcher_round"
      android:supportsRtl="true"
      android:theme="@style/AppTheme">
      <activity android:name=".Dialog">
         <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
         </intent-filter>
      </activity>
   </application>
</manifest>

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 –

Click here to download the project code.