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<?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=".MainActivity">
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Show"
        android:textSize="30dp"
        android:onClick="click"
        android:layout_centerInParent="true"/>

</RelativeLayout>

package com.example.nabeel.myapplicationtutorial2;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;

import static android.view.Gravity.CENTER;

public class MainActivity extends AppCompatActivity {

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

    public void click(View view) {
        LayoutInflater layoutInflater = getLayoutInflater();
        View view1 = layoutInflater.inflate(R.layout.show,null);
        EditText editText = view1.findViewById(R.id.editText);
        editText.setText("WelCome");
        Toast toast = new Toast(getApplication());
        toast.setView(view1);
        toast.setDuration(Toast.LENGTH_LONG);
        toast.setGravity(Gravity.CENTER,0,0);
        toast.show();
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="100pt"
    android:layout_height="100pt"
    android:background="@color/colorAccent"
    android:orientation="vertical">
    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/editText"/>
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Login"/>


</LinearLayout>