APP RANDOM NO EVEREST NAME

APP HIGHEST MOUNTAIN NAME

JAVA FILE

package com.example.viraj.apphighestmountain;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

import java.util.Random;

public class MainActivity extends AppCompatActivity {
private Button b1;
private TextView t1;
    @Override    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        b1=(Button)findViewById(R.id.id_button);
        t1=(TextView)findViewById(R.id.id_text_generator);
        final String [] mountain={"rone","rtwo","rthree","rfour","rfive","rsix","rseven"};
        b1.setOnClickListener(new View.OnClickListener() {
            @Override            public void onClick(View view) {
                Random r1=new Random();
                int randomname=r1.nextInt(mountain.length);//mountin to length is 0 to all numbert1.setText(mountain[randomname]);//example mountain[2] where 2 - rthree             }
        });
    }
}

XML 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="com.example.viraj.apphighestmountain.MainActivity">

    <Button
        android:id="@+id/id_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="8dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="100dp"
        android:text="RANDOM NAME GENERATE"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/id_text_generator"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="8dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="116dp"
        android:text="NAME "
        android:textSize="30dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/id_button" />

</android.support.constraint.ConstraintLayout>