Chakala, hw on Bound Service

activity_main.xml
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<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/llyBack"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <TextView
        android:id="@+id/tvLight1"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:gravity="center"
        android:textSize="50sp" />

    <TextView
        android:id="@+id/tvLight2"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:gravity="center"
        android:textSize="50sp" />
</LinearLayout>

MainActivity.java
-----------------
package com.example.mohamadpc.hckruboundservice;

import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Bundle;
import android.os.IBinder;
import android.support.v7.app.AppCompatActivity;
import android.view.View;

public class MainActivity extends AppCompatActivity implements View.OnClickListener, View.OnLongClickListener {
    private MyService myService;
    private boolean isBound = false;

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

        setPointer();
    }

    private void setPointer() {

        findViewById(R.id.llyBack).setOnClickListener(this);
        findViewById(R.id.llyBack).setOnLongClickListener(this);
    }

    @Override
    public void onClick(View v) {
        if (myService.getActivity() == null) {
            myService.setActivity(this, findViewById(R.id.tvLight1), findViewById(R.id.tvLight2));
        } else {
            myService.setNoActivity();
        }
    }

    @Override
    protected void onStart() {
        super.onStart();
        bind();
    }

    private void bind() {
        // Bind to LocalService
        Intent intent = new Intent(this, MyService.class);
        bindService(intent, myConnection, Context.BIND_AUTO_CREATE);
    }

    /**
     * Defines callbacks for service binding, passed to bindService()
     */
    private ServiceConnection myConnection = new ServiceConnection() {

        @Override
        public void onServiceConnected(ComponentName className,
                                       IBinder service) {
            // We've bound to MyService, cast the IBinder and get MyService instance
            MyService.MyBinder myBinder = (MyService.MyBinder) service;
            myService = myBinder.getService();
            isBound = true;
        }

        @Override
        public void onServiceDisconnected(ComponentName arg0) {
            isBound = false;
        }
    };

    @Override
    protected void onStop() {
        super.onStop();
        myService.setNoActivity();
    }

    @Override
    public boolean onLongClick(View v) {
        myService.changeMode();
        return true;
    }
}

MyService.java
--------------
package com.example.mohamadpc.hckruboundservice;


import android.app.Activity;
import android.app.Service;
import android.content.Intent;
import android.graphics.Color;
import android.os.Binder;
import android.os.IBinder;
import android.support.annotation.Nullable;
import android.util.Log;
import android.view.View;

/**
 * Created by MOHAMADPC on 12/11/2017.
 */

public class MyService extends Service {
    private final IBinder myBinder = new MyBinder();
    private int state = 0;
    private Activity myActivity = null;
    private View light1, light2;
    private State[] myStates;
    private int mode = 0;


    public MyService() {
        myStates = setPolice();

        new Thread(new Runnable() {
            @Override
            public void run() {

                while (true) {
                    state = (state + 1) % myStates.length;
                    Log.d("TESTING", "state=" + state);
                    if (myActivity != null) {

                        myActivity.runOnUiThread(new Runnable() {

                            @Override
                            public void run() {
                                light1.setBackgroundColor(myStates[state].color1);
                                light2.setBackgroundColor(myStates[state].color2);
                            }
                        });
                    }
                    try {
                        Thread.sleep(myStates[state].delay);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }
        }).start();
    }

    public State[] setPolice() {
        State[] police = new State[12];
        police[0] = new State(Color.RED, Color.BLACK, 120);
        police[1] = new State(Color.BLACK, Color.BLACK, 50);
        police[2] = new State(Color.RED, Color.BLACK, 120);
        police[3] = new State(Color.BLACK, Color.BLACK, 50);
        police[4] = new State(Color.RED, Color.BLACK, 120);
        police[5] = new State(Color.BLACK, Color.BLACK, 70);

        police[6] = new State(Color.BLACK, Color.BLUE, 120);
        police[7] = new State(Color.BLACK, Color.BLACK, 50);
        police[8] = new State(Color.BLACK, Color.BLUE, 120);
        police[9] = new State(Color.BLACK, Color.BLACK, 50);
        police[10] = new State(Color.BLACK, Color.BLUE, 120);
        police[11] = new State(Color.BLACK, Color.BLACK, 70);

        return police;
    }

    public State[] setPolice1() {
        State[] police = new State[12];
        police[0] = new State(Color.BLUE, Color.BLACK, 120);
        police[1] = new State(Color.BLACK, Color.BLACK, 50);
        police[2] = new State(Color.BLUE, Color.BLACK, 120);
        police[3] = new State(Color.BLACK, Color.BLACK, 50);
        police[4] = new State(Color.BLUE, Color.BLACK, 120);
        police[5] = new State(Color.BLACK, Color.BLACK, 70);

        police[6] = new State(Color.BLACK, Color.BLUE, 120);
        police[7] = new State(Color.BLACK, Color.BLACK, 50);
        police[8] = new State(Color.BLACK, Color.BLUE, 120);
        police[9] = new State(Color.BLACK, Color.BLACK, 50);
        police[10] = new State(Color.BLACK, Color.BLUE, 120);
        police[11] = new State(Color.BLACK, Color.BLACK, 70);

        return police;
    }

    public State[] setFire() {
        State[] fire = new State[12];
        fire[0] = new State(Color.RED, Color.BLACK, 120);
        fire[1] = new State(Color.BLACK, Color.BLACK, 50);
        fire[2] = new State(Color.RED, Color.BLACK, 120);
        fire[3] = new State(Color.BLACK, Color.BLACK, 50);
        fire[4] = new State(Color.RED, Color.BLACK, 120);
        fire[5] = new State(Color.BLACK, Color.BLACK, 70);

        fire[6] = new State(Color.BLACK, Color.RED, 120);
        fire[7] = new State(Color.BLACK, Color.BLACK, 50);
        fire[8] = new State(Color.BLACK, Color.RED, 120);
        fire[9] = new State(Color.BLACK, Color.BLACK, 50);
        fire[10] = new State(Color.BLACK, Color.RED, 120);
        fire[11] = new State(Color.BLACK, Color.BLACK, 70);

        return fire;
    }

    @Nullable
    @Override

    public IBinder onBind(Intent intent) {
        return myBinder;
    }


    public class MyBinder extends Binder {
        public MyService getService() {
            return MyService.this;
        }

    }

    public Activity getActivity() {
        return myActivity;
    }

    public void setActivity(Activity activity, View light1, View light2) {
        this.myActivity = activity;
        this.light1 = light1;
        this.light2 = light2;
    }

    public void setNoActivity() {
        this.myActivity = null;
        this.light1 = null;
        this.light2 = null;
    }

    private class State {
        int color1;
        int color2;
        int delay;

        public State(int color1, int color2, int delay) {
            this.color1 = color1;
            this.color2 = color2;
            this.delay = delay;
        }
    }

    public void changeMode() {
        mode = (mode + 1) % 3;
        switch (mode) {
            case 0:
                myStates = setPolice();
                break;
            case 1:
                myStates = setFire();
                break;
            case 2:
                myStates = setPolice1();
                break;
        }
    }
}