Tutorial: Android & Mind Games

Developing a game on android is a whole new ball game i.e. very different from making database apps. You have to know the logic behind every move. The flow of the program is complex and you also have to keep in mind about the memory issues if necessary.
Mind games are great mind-teasers as well as thrilling to the general smartphone users. Ever wondered what are the essentials that a typical mind game program is comprised of?
We usually have the following: Random Numbers, Timer, and MotionEvent.
Here is a source code for a little game on Android that i named "Reflexo", as it measures one's reflexes :)


main.xml

reflexo.java:

package com.games.reflexo;

import java.util.Random;

import android.app.Activity;

import android.os.Bundle;

import android.os.CountDownTimer;

import android.view.MotionEvent;

import android.view.View;

import android.view.View.OnTouchListener;

import android.widget.Button;

import android.widget.ImageView;

import android.widget.TextView;

public class Reflexo extends Activity {

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

int score = 0;

int left = 0;

int top = 0;

int right = 0;

int bottom = 0;

Button startGame;

ImageView imgView;

TextView scoreDisplay;

MyCount counter;

int length = 10000;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

startGame = (Button)findViewById(R.id.start);

imgView = (ImageView)findViewById(R.id.img);

scoreDisplay = (TextView)findViewById(R.id.score);

startGame.setOnClickListener(new View.OnClickListener(){

public void onClick(View v)

{

startGame.setVisibility(0);

counter.start();

}

});

imgView.setOnTouchListener(new OnTouchListener(){

public boolean onTouch(View v,MotionEvent e) {

if (e.getAction() == MotionEvent.ACTION_DOWN)

{

score++;

}

return true;

}});

counter = new MyCount(length, 300);

}

public class MyCount extends CountDownTimer

{

public MyCount(long millisInFuture, long countDownInterval) {

super(millisInFuture, countDownInterval);

}

public void onFinish() {

scoreDisplay.setVisibility(1);

scoreDisplay.setText("Score:" + score);

}

public void onTick(long millisUntilFinished) {

Random randomNum = new Random();

left = randomNum.nextInt(200);

top = randomNum.nextInt(400);

right = randomNum.nextInt(200);

bottom = randomNum.nextInt(400);

if (millisUntilFinished / 100 % 2 == 0)

{

imgView.setPadding(left, top, right, bottom);

imgView.setVisibility(View.VISIBLE);

}

else

{

imgView.setVisibility(View.INVISIBLE);

}

}

}

}