mainactivity.java progressbar

package com.example.saigopinarimeti.helloworld;

import android.app.ProgressDialog;
import android.os.Build;
import android.support.v4.app.FragmentManager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ProgressBar;

public class MainActivity extends AppCompatActivity {

    String TAG = "MainActivity";

    ProgressBar progressBar;

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


        progressBar = findViewById(R.id.progresbar);

        findViewById(R.id.showProgress).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                progressBar.setVisibility(View.VISIBLE);

            }
        });

        findViewById(R.id.stopProgress).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                progressBar.setVisibility(View.GONE);
            }
        });


    }


}