Question

Android / Java / Please Upload your homework. Copy the screenshot and then paste it to this word document. Then zip your word file and java files.

Note: if your android project is too big, you can just zip all of the needed xml files and java files.

1. Computer-Assisted Instruction App) Create an app that will help an elementary school student learn multiplication. Select two positive one-digit integers. The app should then prompt the user with a question, such as

How much is 6 times 7?

The student then inputs the answer. Next, the app checks the student’s answer. If its correct, display one of the following messages:

Very good!

Excellent!

Nice work!

Keep up the good work!

And ask another question. If the answer is wrong, display one of the following messages:

No. Please try again.

Wrong. Try once more.

Don’t give up!

No. Keep trying.

And let the student try the same question repeatedly until the student gets it right. Enhance the app to ask addition, subtraction and multiplication questions.

Answer 1

The required files are given below in case of any doubts you can ask me in comments. your downvote effects my career a lot, if I get a downvote for a wrong answer or incomplete answer I will accept it. Please give a positive rating

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">

<Spinner
android:id="@+id/spinner1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:entries="@array/country_arrays"
android:prompt="@string/country_prompt" />

<EditText
android:id="@+id/editText1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="number">

<requestFocus />
</EditText>

<EditText
android:id="@+id/editText2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="number" />

<Button
android:id="@+id/buttonsum"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Submit" />

<TextView
android:id="@+id/textView1"
android:layout_width="match_parent"
android:layout_height="48dp"
android:textAppearance="?android:attr/textAppearanceLarge" />

</LinearLayout>

MainActivity.java

package com.example.myapplication;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Spinner;

import java.util.ArrayList;
import java.util.List;
import android.widget.ArrayAdapter;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.Toast;

public class MainActivity extends Activity {
private Spinner spinner1, spinner2;
private Button btnSubmit;
EditText etv,etv2;
TextView result;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
https://Create object
btnSubmit = (Button) findViewById(R.id.buttonsum);
etv = (EditText) findViewById(R.id.editText1);
etv2 = (EditText) findViewById(R.id.editText2);
result = (TextView) findViewById(R.id.textView1);
https:// Create button click event

addItemsOnSpinner2();
addListenerOnButton();
addListenerOnSpinnerItemSelection();
}

public void addItemsOnSpinner2() {

spinner2 = (Spinner) findViewById(R.id.spinner1);
List<String> list = new ArrayList<String>();
list.add("Addition");
list.add("Substraction");
list.add("Multiplication");
list.add("Division");

ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_item, list);
dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner2.setAdapter(dataAdapter);
}

public void addListenerOnSpinnerItemSelection() {
spinner1 = (Spinner) findViewById(R.id.spinner1);
spinner1.setOnItemSelectedListener(new CustomOnItemSelectedListener());
}

// get the selected dropdown list value
public void addListenerOnButton() {

spinner1 = (Spinner) findViewById(R.id.spinner1);
btnSubmit = (Button) findViewById(R.id.buttonsum);

btnSubmit.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {

double x = new Double(etv.getText().toString());
double y = new Double(etv2.getText().toString());

if(String.valueOf(spinner1.getSelectedItem()).equals("Addition")){
result.setText(String.valueOf(x) + "+"+ String.valueOf(y) + "= "+String.valueOf(x+y));
}else if(String.valueOf(spinner1.getSelectedItem()).equals("Substraction")){
result.setText(String.valueOf(x) + "-"+ String.valueOf(y) + "= "+String.valueOf(x-y));
}else if(String.valueOf(spinner1.getSelectedItem()).equals("Multiplication")){
result.setText(String.valueOf(x) + "*"+ String.valueOf(y) + "= "+String.valueOf(x*y));
}else {
result.setText(String.valueOf(x) + "/"+ String.valueOf(y) + "= "+String.valueOf(x/y));
}
}

});
}

public class CustomOnItemSelectedListener implements OnItemSelectedListener {

public void onItemSelected(AdapterView<?> parent, View view, int pos,long id) {
Toast.makeText(parent.getContext(),
"OnItemSelectedListener : " + parent.getItemAtPosition(pos).toString(),
Toast.LENGTH_SHORT).show();
}

@Override
public void onNothingSelected(AdapterView<?> arg0) {
}

}
}

OUTPUT