Alert Dialog

Alert Dialog in Android

In this tutorial we will learn how to create an Alert Dialog in Android with a simple example. Basically a Dialog is a small pop up window that prompts a user to make the decision.

Example:

• Create a new project as AlertDialog in Android Studio.
• Design a Button in activity_main.xml, as follows

File: activity_main.xml:

<LinearLayout 
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:gravity="center"    
android:paddingBottom="@dimen/activity_vertical_margin"    
android:paddingLeft="@dimen/activity_horizontal_margin"    
android:paddingRight="@dimen/activity_horizontal_margin"    
android:paddingTop="@dimen/activity_vertical_margin"    
tools:context="com.example.hss_24.alertdialog.MainActivity">

<Button       
android:id="@+id/button"       
android:text="Alert Dialog"       
android:layout_width="match_parent"       
android:layout_height="wrap_content" />
</LinearLayout> 

• Now we have to create a Alertdialog by using Builder and set the Positive and Negative Buttons respectively
• Do the following in MainActivity.java file.

File:MainActivity.java:

import android.content.DialogInterface;
import android.os.Bundle;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    @Override    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Button button = (Button) findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {
            @Override            
                public void onClick(View v) {
                AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
                builder.setTitle("CONFIRM DELETE");
                builder.setMessage("Are you sure you want to delete");
                builder.setCancelable(true);

                builder.setPositiveButton(
                        "Yes",
                        new DialogInterface.OnClickListener() {
                            public void onClick(DialogInterface dialog, int id) {
                                Toast.makeText(getApplicationContext(), "Deleted", Toast.LENGTH_LONG).show();
                                dialog.cancel();
                            }
                        });

                builder.setNegativeButton(
                        "No",
                        new DialogInterface.OnClickListener() {
                            public void onClick(DialogInterface dialog, int id) {
                                Toast.makeText(getApplicationContext(), "Not deleted", Toast.LENGTH_LONG).show();
                                dialog.cancel();
                            }
                        });

                AlertDialog alert = builder.create();
                alert.show();
            }
        });
    }
}

Now run the Application.

Output:

Download project here

Thank You!!!

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