package com.netfluke.sergey.handler;

// https://examples.javacodegeeks.com/android/core/os/handler/android-handler-example/

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.view.View;
import android.widget.ProgressBar;

public class MainActivity extends Activity {

    private Handler handler;
    private ProgressBar progressBar;

    /** Called when the activity is first created. */

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        handler = new Handler();
        progressBar = (ProgressBar) findViewById(R.id.progressBar1);
        progressBar.setMax(20);

    }

    public void startProgress(View view) {

        new Thread(new Task()).start();
    }

    class Task implements Runnable {
        @Override
        public void run() {

            for (int i = 0; i <= 20; i++) {
                final int value = i;

                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }

                handler.post(new Runnable() {
                    @Override
                    public void run() {
                        progressBar.setProgress(value);
                    }
                });
            }
        }
    }

}