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App Dev

The document contains code for an Android quiz application that displays multiple choice questions, tracks the score, and allows navigation between questions. It includes Java code for activities to display questions, handle navigation and scoring, and XML layouts for the user interface.

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MD. ADNAN MAHMUD
Copyright
© © All Rights Reserved
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17 views13 pages

App Dev

The document contains code for an Android quiz application that displays multiple choice questions, tracks the score, and allows navigation between questions. It includes Java code for activities to display questions, handle navigation and scoring, and XML layouts for the user interface.

Uploaded by

MD. ADNAN MAHMUD
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Mainactivity>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

package com.example.lab_test;

import static java.security.AccessController.getContext;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {

Button stdbtn1, stdbtn2, stdbtn3, stdbtn4;


String name1="Adnan",name2="Mahmud", name3="Rafsan", name4="Adit", id1="212-15-4155", id2="212-15-7489", id3="212-15-7896",
id4="212-15-9635";

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
stdbtn1 = findViewById(R.id.stdbtn1); stdbtn2 = findViewById(R.id.stdbtn2); stdbtn3 = findViewById(R.id.stdbtn3); stdbtn4 =
findViewById(R.id.stdbtn4);

public void viewStudent(View view) {

stdbtn1.setText(name1);
stdbtn2.setText(name2);
stdbtn3.setText(name3);
stdbtn4.setText(name4);
}

public void stdbmi1(View view) {


Intent intent = new Intent(this, intend.class);
intent.putExtra("Name", name1);
intent.putExtra("id", id1);
startActivity(intent);

public void stdbmi2(View view) {


Intent intent = new Intent(this, intend.class);
intent.putExtra("Name", name2);
intent.putExtra("id", id2);
startActivity(intent);
}

public void stdbmi3(View view) {


Intent intent = new Intent(this, intend.class);
intent.putExtra("Name", name3);
intent.putExtra("id", id3);

startActivity(intent);
}
public void stdbmi4(View view) {
Intent intent = new Intent(this, intend.class);
intent.putExtra("Name", name4);
intent.putExtra("id", id4);
startActivity(intent);
}
}

Intend>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
public class intend extends AppCompatActivity {
EditText weight, height;
String name, id;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_intend);
weight= findViewById(R.id.weight);
height= findViewById(R.id.height);
Intent intent =getIntent();
name= intent.getStringExtra("Name");
id= intent.getStringExtra("id");
TextView textView = findViewById(R.id.name);
textView.setText(name);

public void submit(View view) {


double w = Double.parseDouble(weight.getText().toString());
double h = Double.parseDouble(height.getText().toString());
double r = w / (h * h);
String stringValue = String.valueOf(r);
Toast.makeText(getApplicationContext(), "BMI: " + stringValue, Toast.LENGTH_SHORT).show();
}

public void viewStudent(View view) {


Intent intent = new Intent(this, viewStudent.class);
intent.putExtra("Name", name);
intent.putExtra("id", id);
startActivity(intent);
}
}

Viewstudent>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

public class viewStudent extends AppCompatActivity {


TextView viewname, viewid;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_view_student);
Intent intent =getIntent();
String name= intent.getStringExtra("Name");
String sid= intent.getStringExtra("id");
viewname=findViewById(R.id.name);
viewid=findViewById(R.id.stdid);
viewname.setText(name);
viewid.setText(sid);

}
}

-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
----------
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity"

>

<TextView
android:id="@+id/questionTextviewId"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Question Text"
android:textSize="20dp"
android:layout_marginLeft="30dp"
android:layout_marginTop="50dp"
android:layout_marginBottom="30dp"
/>
<RadioGroup
android:id="@+id/myRadioGroupObjId"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="70dp"
android:orientation="vertical"
>

<RadioButton
android:id="@+id/option1RadioBtnId"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="option 1"
android:textSize="20dp"/>
<RadioButton
android:id="@+id/option2RadioBtnId"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="option 2"
android:textSize="20dp"/>
<RadioButton
android:id="@+id/option3RadioBtnId"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="option 3"
android:textSize="20dp"/>
<RadioButton
android:id="@+id/option4RadioBtnId"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="option 4"
android:textSize="20dp"/>

</RadioGroup>

<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:weightSum="3">

<Button
android:id="@+id/backBtnId"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="back"
android:textSize="25sp" />

<TextView
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:textSize="30sp" />

<Button
android:id="@+id/nextBtnId"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="next"
android:textSize="25sp" />
</LinearLayout>

<TextView
android:id="@+id/scoreTextviewId"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Score"
android:textSize="20dp"
android:layout_margin="50dp"
android:layout_marginBottom="30dp"
/>

</LinearLayout>

Java code>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

package com.example.quiz;

public class MainActivity extends AppCompatActivity {


RadioGroup myRadioGroupObj;
Button nextBtnObj, backBtnObj;
RadioButton option1RadioObj, option2RadioObj, option3RadioObj, option4RadioObj;
TextView questionTextObj, scoreTextviewObj ;
String[] questionArray = {
"Capital of Bangladesh?",
"Capital of India?",
"Currency of BD?",
"Currency of India?"
};
String[][] options = {
{"Rajshahi", "Dhaka", "Chittagong", "Rangpur"},
{"Dillhi", "Mumbai", "Hydarabad", "Pune"},
{"Euro", "USD", "BDT", "Rupee"},
{"USD", "EURO", "BDT", "Rupee"}
};
String[] answers = {"Dhaka", "Delhi", "BDT", "Rupee"};
int score = 0;
int questionIndex = 0;

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

nextBtnObj.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
nextFunction();
}
});
backBtnObj.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
backFunction();
}
});
}

private void loadQuiz() {


questionTextObj.setText(questionArray[questionIndex]);
option1RadioObj.setText(options[questionIndex][0]);
option2RadioObj.setText(options[questionIndex][1]);
option3RadioObj.setText(options[questionIndex][2]);
option4RadioObj.setText(options[questionIndex][3]);
}

private void connection() {


myRadioGroupObj = findViewById(R.id.myRadioGroupObjId);
nextBtnObj = findViewById(R.id.nextBtnId);
backBtnObj = findViewById(R.id.backBtnId);
questionTextObj = findViewById(R.id.questionTextviewId);
scoreTextviewObj = findViewById(R.id.scoreTextviewId);
option1RadioObj = findViewById(R.id.option1RadioBtnId);
option2RadioObj = findViewById(R.id.option2RadioBtnId);
option3RadioObj = findViewById(R.id.option3RadioBtnId);
option4RadioObj = findViewById(R.id.option4RadioBtnId);
}

private void backFunction() {


myRadioGroupObj.clearCheck();
if (questionIndex > 0) {
questionIndex--;
loadQuiz();
} else {
Toast.makeText(this, "There is no way", Toast.LENGTH_SHORT).show();
}
}

private void nextFunction() {


if(questionIndex==questionArray.length-2){
nextBtnObj.setText("Submit");
}
myRadioGroupObj.clearCheck();
if (questionIndex < questionArray.length - 1) {
questionIndex++;
loadQuiz();
} else {
checkAnswer(); // Check the answer for the last question
Toast.makeText(this, "Quiz completed", Toast.LENGTH_SHORT).show();
nextBtnObj.setEnabled(false);
}
}
private void checkAnswer() {
int selectedRadioButtonId = myRadioGroupObj.getCheckedRadioButtonId();
if (selectedRadioButtonId != -1) {
RadioButton selectedRadioButton = findViewById(selectedRadioButtonId);
String selectedAnswer = selectedRadioButton.getText().toString();
if (selectedAnswer.equals(answers[questionIndex])) {
score++;
}
updateScore();
}
}
private void updateScore() {
scoreTextviewObj.setText("Score: " + score);
}

xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

last lab work

main activity::::::::::::::::::::

package com.example.labtask;

public class MainActivity extends AppCompatActivity implements AdapterView.OnItemSelectedListener {


Spinner mySppinerObj;
String option;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mySppinerObj = findViewById(R.id.sppinerID);

ArrayAdapter<CharSequence> myAdapter = ArrayAdapter.createFromResource


(this, R.array.sppinerValues, android.R.layout.simple_spinner_item);
myAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
mySppinerObj.setAdapter(myAdapter);

mySppinerObj.setOnItemSelectedListener(this);
}

@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
option = parent.getItemAtPosition(position).toString();

if (option.equals("USD to BDT")) {
replace(new bmiFragment());
} else if (option.equals("BMI"))
{
replace(new convertionFragment());
}

private void replace (Fragment fragment) {


FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.framentID, fragment);
fragmentTransaction.commit();
}

@Override
public void onNothingSelected(AdapterView<?> parent) {

}
}

bmi fragment>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

package com.example.labtask;

import android.os.Bundle;

import androidx.fragment.app.Fragment;

import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class bmiFragment extends Fragment {

private EditText weightObj, heightObj;


private TextView bmiob;
private Button bmibtn;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_bmi, container, false);

weightObj = view.findViewById(R.id.edit_text_weight);
heightObj = view.findViewById(R.id.edit_text_height);
bmiob = view.findViewById(R.id.text_view_result);
bmibtn = view.findViewById(R.id.button_calculate);

bmibtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
String weightStr = weightObj.getText().toString();
String heightStr = heightObj.getText().toString();

if (weightStr.isEmpty() || heightStr.isEmpty()) {
Toast.makeText(getContext(), "Please enter both weight and height.", Toast.LENGTH_SHORT).show();
return;
}
try {
double weight = Double.parseDouble(weightStr);
double heightCm = Double.parseDouble(heightStr);

// Convert height from centimeters to meters


double heightMeters = heightCm / 100.0;

// Calculate BMI
double bmi = weight / (heightMeters * heightMeters);

// Set the result in the TextView


bmiob.setText(String.format("Your Body Mass Index is: %.2f", bmi));

} catch (NumberFormatException e) {
// Handle invalid input
Toast.makeText(getContext(), "Please enter valid numeric values for weight and height.", Toast.LENGTH_SHORT).show();
}
}
});

return view;
}
}

convertion>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>..

package com.example.labtask;

import android.os.Bundle;

import androidx.fragment.app.Fragment;

import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class convertionFragment extends Fragment {

EditText usdObj;
Button convertbtn;
TextView resultob;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_convertion, container, false);
usdObj = view.findViewById(R.id.usdid);
resultob = view.findViewById(R.id.text_view_result);
convertbtn = view.findViewById(R.id.button_calculate);

convertbtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
String usd = usdObj.getText().toString();

if (usd.isEmpty()) {
Toast.makeText(getContext(), "Please enter USD.", Toast.LENGTH_SHORT).show();
return;
}

try {
double usdd = Double.parseDouble(usd);

// Convert height from centimeters to meters


double bdt = usdd * 117.03;

// Set the result in the TextView


resultob.setText(String.format("%.2f BDT", bdt));

} catch (NumberFormatException e) {
// Handle invalid input
Toast.makeText(getContext(), "Please enter valid numeric values for USD.", Toast.LENGTH_SHORT).show();
}
}
});

return view;
}
}

XML:::::::::::::::::::::::::::::::::::::::::::::::::activity main

<?xml version="1.0" encoding="utf-8"?>


<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity"
android:orientation="vertical"
>

<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Select Calculator"
android:textSize="30dp"
android:layout_marginTop="30dp"
android:textAlignment="center"
/>

<Spinner
android:id="@+id/sppinerID"
android:layout_width="match_parent"
android:layout_height="70dp"
android:layout_marginTop="40dp" />

<FrameLayout
android:id="@+id/framentID"
android:layout_width="match_parent"
android:layout_height="match_parent" />

</LinearLayout>
Fragment bmi:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::

<?xml version="1.0" encoding="utf-8"?>


<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".bmiFragment">

<!-- TODO: Update blank fragment layout -->


<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"

>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="BMI"
android:textAlignment="center"
android:textSize="50dp"
android:textStyle="bold"

/>

<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_marginTop="50dp"
>

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Waght"
android:textSize="30dp"
/>
<EditText
android:id="@+id/edit_text_weight"
android:layout_width="match_parent"
android:layout_height="60dp"

/>

</LinearLayout>

<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_marginTop="50dp"

>

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hight"
android:textSize="30dp"
/>
<EditText
android:id="@+id/edit_text_height"
android:layout_width="match_parent"
android:layout_height="60dp"

/>

</LinearLayout>

<Button
android:id="@+id/button_calculate"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="40dp"
android:text="Calculate"
/>

<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="50dp"
android:id="@+id/text_view_result"
android:text="BMI = "
android:textSize="30dp"
android:textAlignment="center"

/>

</LinearLayout>

</FrameLayout>

Convertion:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::;;;

<?xml version="1.0" encoding="utf-8"?>


<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".convertionFragment">

<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"

>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="USD to BDT"
android:textAlignment="center"
android:textSize="50dp"
android:textStyle="bold"

/>

<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_marginTop="50dp"
>

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="USD"
android:textSize="30dp"
/>
<EditText
android:id="@+id/usdid"
android:layout_width="match_parent"
android:layout_height="60dp"

/>

</LinearLayout>

<Button
android:layout_marginTop="40dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Convart"
android:id="@+id/button_calculate"
/>

<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="50dp"
android:id="@+id/text_view_result"
android:text="BDT = "
android:textSize="30dp"
android:textAlignment="center"

/>

</LinearLayout>

</FrameLayout>

String:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::;;;;

<resources>
<string name="app_name">labtask</string>
<string-array name="sppinerValues">
<item>Select Items</item>
<item>USD to BDT</item>
<item>BMI</item>
</string-array>
<!-- TODO: Remove or change this placeholder text -->
<string name="hello_blank_fragment">Hello blank fragment</string>

</resources>

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