whatssp button

Activity man xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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/btn"
         android:layout_width="warp_content"
         android:layout_height="warp_content"
         android:layout_centerInParent="true"
         android:tex="Contact via whatsapp"/>


</RelativeLayout>

Manactivity.java

package com.example.whatsspbutton;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;


public class MainActivity extends AppCompatActivity {
Button btn; 

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

 btn=findViewById(R.id.btn);
 btn.setOnClickListener(new View.OnClickListener()
 @Override
        public void onClick(View v)
        String wpur="https;//wa.me+916367094588?tex=Hi,Is any one one Available?";

 Intent intent=new Intent(Intent.ACTION_VIEW);
 intent.setData(Uri.parse(wpur));
 startActivity(intent);)
    }

}