AlertDialogBox Tutorial

MainActivity.Java

 

package com.google.materialdesigntools;

import android.app.Activity;
import android.app.AlertDialog;
import android.os.Bundle;
import android.view.View;

public class MainActivity extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    public void open(View v){

        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle("Your Title");
        builder.setMessage("Your Message");
        builder.setPositiveButton("Ok", null);

        builder.show();
    }
}

 activity_main.xml

 

<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:background="#333333">

    <Button
        android:id="@+id/button"
        android:layout_width="200dp"
        android:layout_height="wrap_content"
        android:onClick="open"
        android:text="Dialog"
        android:textSize="20sp"
        android:layout_centerVertical="true"
        android:layout_centerHorizontal="true" />

</RelativeLayout>