How to create popup message using Alerter Library in android

In this article, we learn about how to create a popup message with the help of Alerter Library. It is better to use Alerter than using Toast or Snackbar in cases if some alert messages are to be displayed to the user. We can add various onClickListners to our alerter message which makes it better and it also has nice appealing UI.

Approach:

1. Add the support Library in build.gradle file and add dependency in the dependencies section. This library facilitates easy integration of Alert View in the app. The alert view is customizable and it is displayed over the ongoing activity in the app. This library is also compatible with AndroidX.

   dependencies {
       implementation 'com.tapadoo.android:alerter:2.0.4'
   }
2. Now add the following code in the activity_main.xml file. This codes add a button in the MainActivity and if the button is clicked then showAlerter function is invoked.
   
   activity_main.xml

   <?xml version="1.0" encoding="utf-8"?>
   <androidx.constraintlayout.widget.ConstraintLayout
   
       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:layout_width="match_parent"
       android:layout_height="match_parent"
       tools:context=".MainActivity">
   
       <Button
           android:id="@+id/button"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:onClick="showAlerter"
           android:text="Show Alerter"
           app:layout_constraintBottom_toBottomOf="parent"
           app:layout_constraintLeft_toLeftOf="parent"
           app:layout_constraintRight_toRightOf="parent"
           app:layout_constraintTop_toTopOf="parent" />
   </androidx.constraintlayout.widget.ConstraintLayout>
3. Now add the following code in the MainActivity.java file. It defines the showAlerter function. This function creates the Alerter. Various methods are called to initialize different properties of the Alerter. setTitle sets the title, setText sets the text shown below the title, setIcon sets the icon, etc. Various onClickListeners are also attached so that you can do something in response of the users action.
   
   MainActivity.java

   package org.geeksforgeeks.gfgAlerter;
   
   import androidx.appcompat.app.AppCompatActivity;
   import android.os.Bundle;
   import android.view.View;
   import android.widget.Button;
   import com.tapadoo.alerter.Alerter;
   import com.tapadoo.alerter.OnHideAlertListener;
   import com.tapadoo.alerter.OnShowAlertListener;
   
   public class MainActivity extends AppCompatActivity {
   
       Button button;
       @Override
       protected void onCreate(Bundle savedInstanceState)
       {
           super.onCreate(savedInstanceState);
           setContentView(R.layout.activity_main);
   
           button = findViewById(R.id.button);
       }
   
       public void showAlerter(View v)
       {
           Alerter.create(this)
               .setTitle("Alert Title")
               .setText("Alert Text")
               .setIcon(
                   R.drawable.ic_android_black_24dp)
               .setBackgroundColorRes(
                   R.color.colorAccent)
               .setDuration(3000)
               .setOnClickListener(
                   new View.OnClickListener() {
   
                       @Override
                       public void onClick(View v)
                       {
                           // do something when
                           // Alerter message was clicked
                       }
                   })
   
               .setOnShowListener(
                   new OnShowAlertListener() {
   
                       @Override
                       public void onShow()
                       {
                           // do something when
                           // Alerter message shows
                       }
                   })
   
               .setOnHideListener(
                   new OnHideAlertListener() {
   
                       @Override
                       public void onHide()
                       {
                           // do something when
                           // Alerter message hides
                       }
                   })
               .show();
       }
   }

Output: