Android Game Tutorial

A SIMPLE ANDROID QUIZ APP

Android Game Tutorial

A very very simple android game using SQLite database.

What the application will be doing is :

  • A timer of 1 minute
  • 20 Questions
  • A questions bank class
  • Three buttons for showing options
  • And a good looking UI. Hope you like.

my game

Hey please comment below about what do you think about this post and my work. I do appreciate your time you spend reading my post.

So make a new android application in android studio and name it whatever you want to name it. I named it A simple game.

DESIGNING PART : 

Open your activity_main.xml file [res > layout > activity_main.xml ] and edit it as :

activity_main.xml


<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:ads="http://schemas.android.com/apk/res-auto"
 android:id="@+id/relatively"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:background="#d15400"
 android:orientation="vertical"
 android:weightSum="1" >
 <LinearLayout
 android:id="@+id/linearLayout1"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:layout_weight="0.90"
 android:orientation="vertical"
 android:weightSum="1" >
 <LinearLayout
 android:id="@+id/linearLayout11"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:layout_weight="0.20"
 android:orientation="vertical"
 android:weightSum="1" >
 <LinearLayout
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:layout_weight="1"
 android:orientation="horizontal" >
 <TextView
 android:id="@+id/score"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:layout_centerHorizontal="true"
 android:layout_gravity="center"
 android:layout_marginRight="10dp"
 android:layout_weight="1"
 android:gravity="center"
 android:text="Score : 1"
 android:textColor="#ffffff"
 android:textSize="25.0sp"
 android:textStyle="bold" />
 <TextView
 android:id="@+id/timers"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:layout_centerHorizontal="true"
 android:layout_gravity="center"
 android:layout_marginRight="10dp"
 android:layout_weight="1"
 android:gravity="center"
 android:text="00:00:49"
 android:textColor="#ffffff"
 android:textSize="25.0sp"
 android:textStyle="bold" />
 </LinearLayout>
 </LinearLayout>
 <LinearLayout
 android:id="@+id/linearLayout12"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:layout_weight="0.60"
 android:orientation="vertical"
 android:weightSum="1" >
 <LinearLayout
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:layout_weight="0.40" >
 <TextView
 android:id="@+id/txtQuestion"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:layout_centerHorizontal="true"
 android:layout_gravity="center"
 android:layout_marginTop="5dp"
 android:gravity="center"
 android:text="15*2*1-1"
 android:textColor="#ffffff"
 android:textSize="35.0sp"
 android:textStyle="bold" />
 </LinearLayout>
 <LinearLayout
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:layout_weight="0.20"
 android:orientation="vertical"
 android:weightSum="1" >
 <Button
 android:id="@+id/button1"
 android:layout_width="fill_parent"
 android:layout_height="wrap_content"
 android:layout_gravity="center"
 android:layout_marginLeft="80dp"
 android:layout_marginRight="80dp"
 android:layout_marginTop="5dp"
 android:background="#fff"
 android:gravity="center"
 android:text="30"
 android:textColor="#000000"
 android:textSize="25.0sp" />
 <Button
 android:id="@+id/button2"
 android:layout_width="fill_parent"
 android:layout_height="wrap_content"
 android:layout_gravity="center"
 android:layout_marginLeft="80dp"
 android:layout_marginRight="80dp"
 android:layout_marginTop="5dp"
 android:background="#fff"
 android:gravity="center"
 android:text="29"
 android:textColor="#000000"
 android:textSize="25.0sp" />
 <Button
 android:id="@+id/button3"
 android:layout_width="fill_parent"
 android:layout_height="wrap_content"
 android:layout_gravity="center"
 android:layout_marginLeft="80dp"
 android:layout_marginRight="80dp"
 android:layout_marginTop="5dp"
 android:background="#fff"
 android:gravity="center"
 android:text="32"
 android:textColor="#000000"
 android:textSize="25.0sp" />
 </LinearLayout>
 </LinearLayout>
 </LinearLayout>
</LinearLayout>

Make another xml file with name activity_result.xml and edit it as following :

activity_result.xml


<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:background="#2a3f4c"
 android:orientation="vertical"
 android:layout_centerInParent="true"
 >
 <TextView
 android:id="@+id/textResult"
 android:layout_width="match_parent"
 android:layout_gravity="center"
 android:layout_marginTop="50dp"
 android:layout_height="wrap_content"
 android:text="Large Text"
 android:textColor="#ffffff"
 android:textSize="20sp"
 android:padding="10dp"
 android:textStyle="bold" />
 <Button
 android:id="@+id/btn"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:background="#000000"
 android:layout_marginTop="50dp"
 android:padding="20dp"
 android:layout_gravity="center"
 android:onClick="playagain"
 android:text="PLAY AGAIN"
 android:textColor="#ffffff"
 android:textSize="20sp"/>

</LinearLayout>

OK design part is  done (as simple as that).

CODING PART :

There are four class files :

    • Question.java
    • QuestionActivity.java
    • QuizHelper.java
    • ResultActivity.java

Make it and edit all of them as below.

Question.java

[java]
package hitesh.asimplegame;

import android.app.Activity;

public class Question extends Activity {

private int ID;
private String QUESTION;
private String OPTA;
private String OPTB;
private String OPTC;

private String ANSWER;

public Question() {
ID = 0;
QUESTION = "";
OPTA = "";
OPTB = "";
OPTC = "";

ANSWER = "";

}

public Question(String qUESTION, String oPTA, String oPTB, String oPTC,
String aNSWER) {
QUESTION = qUESTION;
OPTA = oPTA;
OPTB = oPTB;
OPTC = oPTC;

ANSWER = aNSWER;

}

public int getID() {
return ID;
}

public String getQUESTION() {
return QUESTION;
}

public String getOPTA() {
return OPTA;
}

public String getOPTB() {
return OPTB;
}

public String getOPTC() {
return OPTC;
}

public String getANSWER() {
return ANSWER;
}

public void setID(int id) {
ID = id;
}

public void setQUESTION(String qUESTION) {
QUESTION = qUESTION;
}

public void setOPTA(String oPTA) {
OPTA = oPTA;
}

public void setOPTB(String oPTB) {
OPTB = oPTB;
}

public void setOPTC(String oPTC) {
OPTC = oPTC;
}

public void setANSWER(String aNSWER) {
ANSWER = aNSWER;
}

}

[/java]

QuestionActivity.java

[java]

package hitesh.asimplegame;

/**
* Created by H on 7/12/2015.
*/

import java.util.List;
import java.util.Timer;
import java.util.concurrent.TimeUnit;

import android.annotation.SuppressLint;
import android.annotation.TargetApi;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Typeface;
import android.media.MediaPlayer;
import android.os.Build;
import android.os.Bundle;
import android.os.CountDownTimer;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class QuestionActivity extends Activity {
List<Question> quesList;
int score = 0;
int qid = 0;

Question currentQ;
TextView txtQuestion, times, scored;
Button button1, button2, button3;

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

QuizHelper db = new QuizHelper(this); // my question bank class
quesList = db.getAllQuestions(); // this will fetch all quetonall questions
currentQ = quesList.get(qid); // the current question

txtQuestion = (TextView) findViewById(R.id.txtQuestion);
// the textview in which the question will be displayed

// the three buttons,
// the idea is to set the text of three buttons with the options from question bank
button1 = (Button) findViewById(R.id.button1);
button2 = (Button) findViewById(R.id.button2);
button3 = (Button) findViewById(R.id.button3);

// the textview in which score will be displayed
scored = (TextView) findViewById(R.id.score);

// the timer
times = (TextView) findViewById(R.id.timers);

// method which will set the things up for our game
setQuestionView();
times.setText("00:02:00");

// A timer of 60 seconds to play for, with an interval of 1 second (1000 milliseconds)
CounterClass timer = new CounterClass(60000, 1000);
timer.start();

// button click listeners
button1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {

// passing the button text to other method
// to check whether the anser is correct or not
// same for all three buttons
getAnswer(button1.getText().toString());
}
});

button2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
getAnswer(button2.getText().toString());
}
});

button3.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
getAnswer(button3.getText().toString());
}
});
}

public void getAnswer(String AnswerString) {
if (currentQ.getANSWER().equals(AnswerString)) {

// if conditions matches increase the int (score) by 1
// and set the text of the score view
score++;
scored.setText("Score : " + score);
} else {

// if unlucky start activity and finish the game

Intent intent = new Intent(QuestionActivity.this,
ResultActivity.class);

// passing the int value
Bundle b = new Bundle();
b.putInt("score", score); // Your score
intent.putExtras(b); // Put your score to your next
startActivity(intent);
finish();
}
if (qid < 20) {

// if questions are not over then do this
currentQ = quesList.get(qid);
setQuestionView();
} else {

// if over do this
Intent intent = new Intent(QuestionActivity.this,
ResultActivity.class);
Bundle b = new Bundle();
b.putInt("score", score); // Your score
intent.putExtras(b); // Put your score to your next
startActivity(intent);
finish();
}

}

@TargetApi(Build.VERSION_CODES.GINGERBREAD)
@SuppressLint("NewApi")
public class CounterClass extends CountDownTimer {

public CounterClass(long millisInFuture, long countDownInterval) {
super(millisInFuture, countDownInterval);
// TODO Auto-generated constructor stub
}

@Override
public void onFinish() {
times.setText("Time is up");
}

@Override
public void onTick(long millisUntilFinished) {
// TODO Auto-generated method stub

long millis = millisUntilFinished;
String hms = String.format(
"%02d:%02d:%02d",
TimeUnit.MILLISECONDS.toHours(millis),
TimeUnit.MILLISECONDS.toMinutes(millis)
– TimeUnit.HOURS.toMinutes(TimeUnit.MILLISECONDS
.toHours(millis)),
TimeUnit.MILLISECONDS.toSeconds(millis)
– TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS
.toMinutes(millis)));
System.out.println(hms);
times.setText(hms);
}

}

private void setQuestionView() {

// the method which will put all things together
txtQuestion.setText(currentQ.getQUESTION());
button1.setText(currentQ.getOPTA());
button2.setText(currentQ.getOPTB());
button3.setText(currentQ.getOPTC());

qid++;
}

}

[/java]

QuizHelper.java

[java]
package hitesh.asimplegame;

import java.util.ArrayList;
import java.util.List;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;

public class QuizHelper extends SQLiteOpenHelper {
private static final int DATABASE_VERSION = 1;
// Database Name
private static final String DATABASE_NAME = "mathsone";
// tasks table name
private static final String TABLE_QUEST = "quest";
// tasks Table Columns names
private static final String KEY_ID = "qid";
private static final String KEY_QUES = "question";
private static final String KEY_ANSWER = "answer"; // correct option
private static final String KEY_OPTA = "opta"; // option a
private static final String KEY_OPTB = "optb"; // option b
private static final String KEY_OPTC = "optc"; // option c

private SQLiteDatabase dbase;

public QuizHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}

@Override
public void onCreate(SQLiteDatabase db) {
dbase = db;
String sql = "CREATE TABLE IF NOT EXISTS " + TABLE_QUEST + " ( "
+ KEY_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " + KEY_QUES
+ " TEXT, " + KEY_ANSWER + " TEXT, " + KEY_OPTA + " TEXT, "
+ KEY_OPTB + " TEXT, " + KEY_OPTC + " TEXT)";
db.execSQL(sql);
addQuestion();
// db.close();
}

private void addQuestion() {
Question q1 = new Question("5+2 = ?", "7", "8", "6", "7");
this.addQuestion(q1);
Question q2 = new Question("2+18 = ?", "18", "19", "20", "20");
this.addQuestion(q2);
Question q3 = new Question("10-3 = ?", "6", "7", "8", "7");
this.addQuestion(q3);
Question q4 = new Question("5+7 = ?", "12", "13", "14", "12");
this.addQuestion(q4);
Question q5 = new Question("3-1 = ?", "1", "3", "2", "2");
this.addQuestion(q5);
Question q6 = new Question("0+1 = ?", "1", "0", "10", "1");
this.addQuestion(q6);
Question q7 = new Question("9-9 = ?", "0", "9", "1", "0");
this.addQuestion(q7);
Question q8 = new Question("3+6 = ?", "8", "7", "9", "9");
this.addQuestion(q8);
Question q9 = new Question("1+5 = ?", "6", "7", "5", "6");
this.addQuestion(q9);
Question q10 = new Question("7-5 = ?", "3", "2", "6", "2");
this.addQuestion(q10);
Question q11 = new Question("7-2 = ?", "7", "6", "5", "5");
this.addQuestion(q11);
Question q12 = new Question("3+5 = ?", "8", "7", "5", "8");
this.addQuestion(q12);
Question q13 = new Question("0+6 = ?", "7", "6", "5", "6");
this.addQuestion(q13);
Question q14 = new Question("12-10 = ?", "1", "2", "3", "2");
this.addQuestion(q14);
Question q15 = new Question("12+2 = ?", "14", "15", "16", "14");
this.addQuestion(q15);
Question q16 = new Question("2-1 = ?", "2", "1", "0", "1");
this.addQuestion(q16);
Question q17 = new Question("6-6 = ?", "6", "12", "0", "0");
this.addQuestion(q17);
Question q18 = new Question("5-1 = ?", "4", "3", "2", "4");
this.addQuestion(q18);
Question q19 = new Question("4+2 = ?", "6", "7", "5", "6");
this.addQuestion(q19);
Question q20 = new Question("5+1 = ?", "6", "7", "5", "6");
this.addQuestion(q20);
Question q21 = new Question("5-4 = ?", "5", "4", "1", "1");
this.addQuestion(q21);
// END
}

@Override
public void onUpgrade(SQLiteDatabase db, int oldV, int newV) {
// Drop older table if existed
db.execSQL("DROP TABLE IF EXISTS " + TABLE_QUEST);
// Create tables again
onCreate(db);
}

// Adding new question
public void addQuestion(Question quest) {
// SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_QUES, quest.getQUESTION());
values.put(KEY_ANSWER, quest.getANSWER());
values.put(KEY_OPTA, quest.getOPTA());
values.put(KEY_OPTB, quest.getOPTB());
values.put(KEY_OPTC, quest.getOPTC());

// Inserting Row
dbase.insert(TABLE_QUEST, null, values);
}

public List<Question> getAllQuestions() {
List<Question> quesList = new ArrayList<Question>();
// Select All Query
String selectQuery = "SELECT * FROM " + TABLE_QUEST;
dbase = this.getReadableDatabase();
Cursor cursor = dbase.rawQuery(selectQuery, null);
// looping through all rows and adding to list
if (cursor.moveToFirst()) {
do {
Question quest = new Question();
quest.setID(cursor.getInt(0));
quest.setQUESTION(cursor.getString(1));
quest.setANSWER(cursor.getString(2));
quest.setOPTA(cursor.getString(3));
quest.setOPTB(cursor.getString(4));
quest.setOPTC(cursor.getString(5));

quesList.add(quest);
} while (cursor.moveToNext());
}
// return quest list
return quesList;
}

}

[/java]

ResultActivity.java

[java]
package hitesh.asimplegame;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;

import android.view.View;
import android.widget.TextView;

public class ResultActivity extends Activity {

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

TextView textResult = (TextView) findViewById(R.id.textResult);

Bundle b = getIntent().getExtras();

int score = b.getInt("score");

textResult.setText("Your score is " + " " + score + ". Thanks for playing my game.");

}

public void playagain(View o) {

Intent intent = new Intent(this, QuestionActivity.class);

startActivity(intent);

}
}
[/java]

And last but not the least AndroidManifest.xml

[xml]

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="hitesh.asimplegame" >

<application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" >
<activity android:name=".QuestionActivity" android:label="@string/app_name" android:screenOrientation="portrait">
<intent-filter>
<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".ResultActivity" android:label="@string/app_name" android:screenOrientation="portrait"/>

</application>

</manifest>

[/xml]

my game

 

You can download the source using this link : A Simple Game.

Hey please comment below about what do you think about this post and my work. I do appreciate your time you spend reading my post…..


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