Stack Answer

WebViewGMAILLookALIKE.java

package web.view.expirement;

import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.webkit.WebChromeClient;
import android.webkit.WebResourceRequest;
import android.webkit.WebView;
import android.webkit.WebViewClient;

public class MainActivity extends AppCompatActivity {

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

        final Context cn = getBaseContext();


        WebView wv = findViewById(R.id.myWebView);

        wv.loadUrl("https://www.blogmaza.com/");

        wv.getSettings().setSupportMultipleWindows(true);

        wv.setWebViewClient(new WebViewClient() {
            @Override
            public boolean shouldOverrideUrlLoading(WebView view, String url) {


                System.out.println("URLOFCLICK"+url);

                Intent intents=new Intent(cn,WebviewOpenerLikeGMAIL.class);
                intents.putExtra("URL",  url);
                startActivity(intents);



                return true;
            }
        });

    }


}



================================================Another File


public class WebviewOpenerLikeGMAIL extends Activity implements Serializable, View.OnClickListener {

    private WebView mWebView;


    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.gmaillike);
        mWebView = findViewById(R.id.myGMAILwebview);
        Button closeVIEW = findViewById(R.id.button);
        closeVIEW.setOnClickListener(this);
        String value = getIntent().getExtras().getString("URL");
        mWebView.loadUrl(value);
        mWebView.getSettings().setJavaScriptEnabled(true);
        mWebView.getSettings().setUseWideViewPort(true);
        mWebView.getSettings().setLoadWithOverviewMode(true);

    }


    @Override
    public void onClick(View v) {
        onBackPressed();
    }


    @Override
    public void onBackPressed() {
        //this is only needed if you have specific things
        //that you want to do when the user presses the back button.
        /* your specific things...*/
        super.onBackPressed();
    }
}





GMAIL LookALIKE VIEW XML Another FILE

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">


    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1"
                android:text="CLOSE" />

    <WebView
        android:id="@+id/myGMAILwebview"

        android:layout_width="match_parent"
        android:layout_height="400dp" />
</LinearLayout>




MAIN ACTIVITY VIEW XML Another File

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.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">

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <WebView
        android:id="@+id/myWebView"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</android.support.constraint.ConstraintLayout>