Alert Dialog in Android

Alert Dialog in Android

In some conditions in your application you ask the decisions of user like yes or no. By taking the user response in the same activity  and within changing the screen(activity) you can use a alert dialog.

Create a new project in Android Studio.

File --> New Android -->Application Project

Next, Select Target Device

After that, Select Activity

And then Click finish.

* For, alert dialog you need to create a object  of AlertDialogBuilder which an inner class of AlertDialog. see below,

AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(this);

Then, you have to set yes or no buttons

like this:

alertDialogBuilder.setPositiveButton(CharSequence text,
   DialogInterface.OnClickListener listener)
alertDialogBuilder.setNegativeButton(CharSequence text,
   DialogInterface.OnClickListener listener)

For 2 Buttons(Yes or no):

activity_main.xml:

<?xml version="1.0" encoding="utf-8"?>
<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="end.sample.webviewandroid.MainActivity">

    <TextView
        android:textSize="20sp"
        android:textColor="#000000"
        android:text="Welcome to MainActivity"
        android:gravity="center"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</RelativeLayout>


MainActivity.java:

import android.content.DialogInterface;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.webkit.WebView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

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

        AlertDialog.Builder alertDialog = new AlertDialog.Builder(MainActivity.this);

        // Setting Dialog Title
        alertDialog.setTitle("Confirm Exit...");

        // Setting Dialog Message
        alertDialog.setMessage("Are you sure you want exit?");

        // Setting Icon to Dialog
        alertDialog.setIcon(R.drawable.ic_launcher);

        // Setting Positive "Yes" Button
        alertDialog.setPositiveButton("YES", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog,int which) {

                // Write your code here to invoke YES event
                Toast.makeText(getApplicationContext(), "YES", Toast.LENGTH_SHORT).show();
            }
        });

        // Setting Negative "NO" Button
        alertDialog.setNegativeButton("NO", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                // Write your code here to invoke NO event
                Toast.makeText(getApplicationContext(), "NO", Toast.LENGTH_SHORT).show();
                dialog.cancel();
            }
        });

        // Showing Alert Message
        alertDialog.show();

    }
}


 
For 3 Buttons(Yes or no or cancel):

 activity_main.xml

 <?xml version="1.0" encoding="utf-8"?>
<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="end.sample.webviewandroid.MainActivity">

    <TextView
        android:textSize="20sp"
        android:textColor="#000000"
        android:text="Welcome to MainActivity"
        android:gravity="center"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</RelativeLayout>


MainActivity.java:

import android.content.DialogInterface;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.webkit.WebView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

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

        AlertDialog.Builder alertDialog = new AlertDialog.Builder(MainActivity.this);

        // Setting Dialog Title
        alertDialog.setTitle("Confirm Exit...");

        // Setting Dialog Message
        alertDialog.setMessage("Are you sure you want exit?");

        // Setting Icon to Dialog
        alertDialog.setIcon(R.drawable.ic_launcher);

        // Setting Positive "Yes" Button
        alertDialog.setPositiveButton("YES", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog,int which) {

                // Write your code here to invoke YES event
                Toast.makeText(getApplicationContext(), "YES", Toast.LENGTH_SHORT).show();
            }
        });

        // Setting Negative "NO" Button
        alertDialog.setNegativeButton("NO", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                // Write your code here to invoke NO event
                Toast.makeText(getApplicationContext(), "NO", Toast.LENGTH_SHORT).show();
                dialog.cancel();
            }
        });

        // Showing Alert Message
        alertDialog.show();

    }
}

Full Code:

MainActivity.java

package end.sample.webviewandroid;

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

public class MainActivity extends AppCompatActivity {

    Button twobuttons, threebuttons;

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

        twobuttons  = (Button) findViewById(R.id.twobuttons);
        twobuttons.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                gototwobuttons();
            }
        });

        threebuttons  = (Button) findViewById(R.id.threebuttons);
        threebuttons.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                gotothreebuttons();
            }
        });
    }

    private void gototwobuttons() {
        AlertDialog.Builder alertDialog = new AlertDialog.Builder(MainActivity.this);

        // Setting Dialog Title
        alertDialog.setTitle("Confirm Exit...");

        // Setting Dialog Message
        alertDialog.setMessage("Are you sure you want exit?");

        // Setting Icon to Dialog
        alertDialog.setIcon(R.drawable.ic_launcher);

        // Setting Positive "Yes" Button
        alertDialog.setPositiveButton("YES", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog,int which) {

                // Write your code here to invoke YES event
                Toast.makeText(getApplicationContext(), "YES", Toast.LENGTH_SHORT).show();
            }
        });

        // Setting Negative "NO" Button
        alertDialog.setNegativeButton("NO", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                // Write your code here to invoke NO event
                Toast.makeText(getApplicationContext(), "NO", Toast.LENGTH_SHORT).show();
                dialog.cancel();
            }
        });

        // Showing Alert Message
        alertDialog.show();
    }

    private void gotothreebuttons() {

        AlertDialog.Builder alertDialog = new AlertDialog.Builder(MainActivity.this);

        // Setting Dialog Title
        alertDialog.setTitle("Save Data...");

        // Setting Dialog Message
        alertDialog.setMessage("Do you want to save this data?");

        // Setting Icon to Dialog
        alertDialog.setIcon(R.drawable.ic_launcher);

        // Setting Positive "Yes" Button
        alertDialog.setPositiveButton("YES", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                // User pressed YES button. Write Logic Here
                Toast.makeText(getApplicationContext(), "YES",
                        Toast.LENGTH_SHORT).show();
            }
        });

        // Setting Negative "NO" Button
        alertDialog.setNegativeButton("NO", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                // User pressed No button. Write Logic Here
                Toast.makeText(getApplicationContext(), "NO", Toast.LENGTH_SHORT).show();
            }
        });

        // Setting Netural "Cancel" Button
        alertDialog.setNeutralButton("Cancel", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                // User pressed Cancel button. Write Logic Here
                Toast.makeText(getApplicationContext(), "Cancel",
                        Toast.LENGTH_SHORT).show();
            }
        });

        // Showing Alert Message
        alertDialog.show();
    }
}
 

activity_main.xml:

  <?xml version="1.0" encoding="utf-8"?>
<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="end.sample.webviewandroid.MainActivity">

    <TextView
        android:textSize="20sp"
        android:textColor="#000000"
        android:text="Welcome to MainActivity"
        android:gravity="center"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</RelativeLayout>


Output:

output will be like this:

For 2 Buttons

For 3 Buttons

 Done.