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package com.example.test.testhandler2;
 
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ProgressBar;
 
public class MainActivity1 extends Activity {
    private Button button1;
    private Button button2;
    private ProgressBar progressBar1;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main1);
        button1 = (Button) findViewById(R.id.button1);
        button2 = (Button) findViewById(R.id.button2);
        progressBar1 = (ProgressBar) findViewById(R.id.progressBar1);
 
        button1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                progressBar1.setVisibility(View.VISIBLE);
                handler1.post(runnable1);
            }
        });
        button2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Log.i("Test","Remove Thread");
                handler1.removeCallbacks(runnable1);
            }
        });
    }
 
    Handler handler1 = new Handler(){
        @Override
        public void handleMessage(Message msg){
            progressBar1.setProgress(msg.arg1);
            handler1.post(runnable1);
        }
    };
 
    Runnable runnable1 = new Runnable() {
        int i = 0;
        @Override
        public void run() {
            Log.i("Test","Begin Thread");
            i = i + 10;
            Message message1 = handler1.obtainMessage();
            message1.arg1 = i;
            Log.i("Test",String.format("%d",i));
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            handler1.sendMessage(message1);
 
            if (i == 100){
                Log.i("Test","Remove Thread");
                handler1.removeCallbacks(runnable1);
            }
        }
    };
}

Main.java:12: error: class MainActivity1 is public, should be declared in a file named MainActivity1.java
public class MainActivity1 extends Activity {
       ^
Main.java:3: error: package android.app does not exist
import android.app.Activity;
                  ^
Main.java:4: error: package android.os does not exist
import android.os.Bundle;
                 ^
Main.java:5: error: package android.os does not exist
import android.os.Handler;
                 ^
Main.java:6: error: package android.os does not exist
import android.os.Message;
                 ^
Main.java:7: error: package android.util does not exist
import android.util.Log;
                   ^
Main.java:8: error: package android.view does not exist
import android.view.View;
                   ^
Main.java:9: error: package android.widget does not exist
import android.widget.Button;
                     ^
Main.java:10: error: package android.widget does not exist
import android.widget.ProgressBar;
                     ^
Main.java:12: error: cannot find symbol
public class MainActivity1 extends Activity {
                                   ^
  symbol: class Activity
Main.java:13: error: cannot find symbol
    private Button button1;
            ^
  symbol:   class Button
  location: class MainActivity1
Main.java:14: error: cannot find symbol
    private Button button2;
            ^
  symbol:   class Button
  location: class MainActivity1
Main.java:15: error: cannot find symbol
    private ProgressBar progressBar1;
            ^
  symbol:   class ProgressBar
  location: class MainActivity1
Main.java:18: error: cannot find symbol
    protected void onCreate(Bundle savedInstanceState) {
                            ^
  symbol:   class Bundle
  location: class MainActivity1
Main.java:41: error: cannot find symbol
    Handler handler1 = new Handler(){
    ^
  symbol:   class Handler
  location: class MainActivity1
Main.java:17: error: method does not override or implement a method from a supertype
    @Override
    ^
Main.java:19: error: cannot find symbol
        super.onCreate(savedInstanceState);
        ^
  symbol:   variable super
  location: class MainActivity1
Main.java:20: error: package R does not exist
        setContentView(R.layout.activity_main1);
                        ^
Main.java:21: error: cannot find symbol
        button1 = (Button) findViewById(R.id.button1);
                   ^
  symbol:   class Button
  location: class MainActivity1
Main.java:21: error: package R does not exist
        button1 = (Button) findViewById(R.id.button1);
                                         ^
Main.java:22: error: cannot find symbol
        button2 = (Button) findViewById(R.id.button2);
                   ^
  symbol:   class Button
  location: class MainActivity1
Main.java:22: error: package R does not exist
        button2 = (Button) findViewById(R.id.button2);
                                         ^
Main.java:23: error: cannot find symbol
        progressBar1 = (ProgressBar) findViewById(R.id.progressBar1);
                        ^
  symbol:   class ProgressBar
  location: class MainActivity1
Main.java:23: error: package R does not exist
        progressBar1 = (ProgressBar) findViewById(R.id.progressBar1);
                                                   ^
Main.java:25: error: package View does not exist
        button1.setOnClickListener(new View.OnClickListener() {
                                           ^
Main.java:32: error: package View does not exist
        button2.setOnClickListener(new View.OnClickListener() {
                                           ^
Main.java:41: error: cannot find symbol
    Handler handler1 = new Handler(){
                           ^
  symbol:   class Handler
  location: class MainActivity1
Main.java:53: error: cannot find symbol
            Log.i("Test","Begin Thread");
            ^
  symbol: variable Log
Main.java:55: error: cannot find symbol
            Message message1 = handler1.obtainMessage();
            ^
  symbol: class Message
Main.java:57: error: cannot find symbol
            Log.i("Test",String.format("%d",i));
            ^
  symbol: variable Log
Main.java:66: error: cannot find symbol
                Log.i("Test","Remove Thread");
                ^
  symbol: variable Log
31 errors

Standard output is empty