Android Launch Whatsapp

Launch Whatsapp:

If you are developing an Android application and wishes to integrate the application to the WhatsApp application by making a call with a WhatsApp number or contact, you may use an explicit Intent that will call the WhatsApp application with the number/contact.

Example:

                                    

                                       // AndroidManifest.xml
<uses-permission android:name="android.permission.INTERNET" />



// activity_launch_whatsapp.xml
<?xml version="1.0" encoding="utf-8"?>
<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"
        tools:context=".LaunchWhatsapp"
        android:background="@color/colorAccent"
        android:gravity="center"
        android:padding="16dp"
        android:orientation="vertical">
   
       <TextView
           android:layout_width="match_parent"
           android:layout_height="wrap_content"
           android:text="Click on button to Launch Whatsapp"
           android:textColor="@color/colorWhite"
           android:textSize="30sp"
           android:gravity="center"/>
   
       <Button
           android:id="@+id/click"
           android:layout_width="match_parent"
           android:layout_height="wrap_content"
           android:text="Launch Whatsapp"
           android:textColor="@color/colorWhite"
           android:textSize="16dp"
           android:layout_marginTop="20dp"
           android:background="@color/colorPrimaryDark"
           />
   
</LinearLayout>

                                    
package com.example.widgets;
    
import android.content.Intent;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
    
public class LaunchWhatsapp extends AppCompatActivity {
   
    Button button;
   
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_launch_whatsapp);
   
        button=(Button)findViewById(R.id.click);
   
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
   
                Intent intent=getPackageManager().getLaunchIntentForPackage("com.whatsapp");
                Intent.createChooser(intent,"Launch Whatsapp");
                startActivity(intent);
   
            }
        });
   
    }
}

                                    
                                        package com.example.widgets

import android.content.Intent
import android.os.Bundle
import android.view.View
import android.widget.Button
import androidx.appcompat.app.AppCompatActivity

class LaunchWhatsapp : AppCompatActivity() {

    private lateinit var button: Button

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_launch_whatsapp)

        button = findViewById(R.id.click)

        button.setOnClickListener(View.OnClickListener {
            val intent = packageManager.getLaunchIntentForPackage("com.whatsapp")
            Intent.createChooser(intent, "Launch Whatsapp")
            startActivity(intent)
        })
    }
}

Output