How To create Simple Calculator Android App in Android Studio like Addition subtraction , multiplication and division etc.
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How To create Scientific calculator Android App in Android Studio
MainActivity.java
package com.deep.calc;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import androidx.appcompat.app.AppCompatActivity;
public class MainActivity extends AppCompatActivity {
Button button0, button1, button2, button3, button4, button5, button6,
button7, button8, button9, buttonAdd, buttonSub, buttonDivision,
buttonMul, button10, buttonC, buttonEqual;
EditText deepEditText;
float mValueOne, mValueTwo;
boolean deepAddition, mSubtract, deepMultiplication, deepDivision;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button0 = (Button) findViewById(R.id.button0);
button1 = (Button) findViewById(R.id.button1);
button2 = (Button) findViewById(R.id.button2);
button3 = (Button) findViewById(R.id.button3);
button4 = (Button) findViewById(R.id.button4);
button5 = (Button) findViewById(R.id.button5);
button6 = (Button) findViewById(R.id.button6);
button7 = (Button) findViewById(R.id.button7);
button8 = (Button) findViewById(R.id.button8);
button9 = (Button) findViewById(R.id.button9);
button10 = (Button) findViewById(R.id.button10);
buttonAdd = (Button) findViewById(R.id.buttonadd);
buttonSub = (Button) findViewById(R.id.buttonsub);
buttonMul = (Button) findViewById(R.id.buttonmul);
buttonDivision = (Button) findViewById(R.id.buttondiv);
buttonC = (Button) findViewById(R.id.buttonC);
buttonEqual = (Button) findViewById(R.id.buttoneql);
deepEditText = (EditText) findViewById(R.id.edt1);
button1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
deepEditText.setText(deepEditText.getText() + "1");
}
});
button2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
deepEditText.setText(deepEditText.getText() + "2");
}
});
button3.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
deepEditText.setText(deepEditText.getText() + "3");
}
});
button4.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
deepEditText.setText(deepEditText.getText() + "4");
}
});
button5.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
deepEditText.setText(deepEditText.getText() + "5");
}
});
button6.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
deepEditText.setText(deepEditText.getText() + "6");
}
});
button7.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
deepEditText.setText(deepEditText.getText() + "7");
}
});
button8.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
deepEditText.setText(deepEditText.getText() + "8");
}
});
button9.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
deepEditText.setText(deepEditText.getText() + "9");
}
});
button0.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
deepEditText.setText(deepEditText.getText() + "0");
}
});
buttonAdd.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (deepEditText == null) {
deepEditText.setText("");
} else {
mValueOne = Float.parseFloat(deepEditText.getText() + "");
deepAddition = true;
deepEditText.setText(null);
}
}
});
buttonSub.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mValueOne = Float.parseFloat(deepEditText.getText() + "");
mSubtract = true;
deepEditText.setText(null);
}
});
buttonMul.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mValueOne = Float.parseFloat(deepEditText.getText() + "");
deepMultiplication = true;
deepEditText.setText(null);
}
});
buttonDivision.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mValueOne = Float.parseFloat(deepEditText.getText() + "");
deepDivision = true;
deepEditText.setText(null);
}
});
buttonEqual.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mValueTwo = Float.parseFloat(deepEditText.getText() + "");
if (deepAddition == true) {
deepEditText.setText(mValueOne + mValueTwo + "");
deepAddition = false;
}
if (mSubtract == true) {
deepEditText.setText(mValueOne - mValueTwo + "");
mSubtract = false;
}
if (deepMultiplication == true) {
deepEditText.setText(mValueOne * mValueTwo + "");
deepMultiplication = false;
}
if (deepDivision == true) {
deepEditText.setText(mValueOne / mValueTwo + "");
deepDivision = false;
}
}
});
buttonC.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
deepEditText.setText("");
}
});
button10.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
deepEditText.setText(deepEditText.getText() + ".");
}
});
}
}
step wise xml file calculator app android studio
Again that we are well versed with Activity, Layout, Views etc its time to get our hands dirty, and create our second application. This application will have a science quiz app, and user will have option to answer in True or False. Based on what the user enters, we will show the user, whether they selected the correct option or not by simply showing a message saying Correct or Incorrect.
For Quiz App Open Android Studio and go to File → New → New Project. In the New Project window, enter the Application Name as Quiz and company domain as com.technic.calc and Click on Next.
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/relative1"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<EditText
android:id="@+id/edt1"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<Button
android:id="@+id/button1"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/edt1"
android:layout_alignEnd="@+id/button4"
android:layout_alignRight="@+id/button4"
android:layout_marginTop="94dp"
android:text="1" />
<Button
android:id="@+id/button2"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignTop="@+id/button1"
android:layout_toStartOf="@+id/button3"
android:layout_toLeftOf="@+id/button3"
android:text="2" />
<Button
android:id="@+id/button3"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignTop="@+id/button2"
android:layout_centerHorizontal="true"
android:text="3" />
<Button
android:id="@+id/button4"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/button1"
android:layout_toLeftOf="@+id/button2"
android:text="4" />
<Button
android:id="@+id/button5"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignStart="@+id/button2"
android:layout_alignLeft="@+id/button2"
android:layout_alignBottom="@+id/button4"
android:text="5" />
<Button
android:id="@+id/button6"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/button3"
android:layout_alignStart="@+id/button3"
android:layout_alignLeft="@+id/button3"
android:text="6" />
<Button
android:id="@+id/button7"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/button4"
android:layout_toLeftOf="@+id/button2"
android:text="7" />
<Button
android:id="@+id/button8"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/button5"
android:layout_alignStart="@+id/button5"
android:layout_alignLeft="@+id/button5"
android:text="8" />
<Button
android:id="@+id/button9"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/button6"
android:layout_alignStart="@+id/button6"
android:layout_alignLeft="@+id/button6"
android:text="9" />
<Button
android:id="@+id/buttonadd"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignTop="@+id/button3"
android:layout_alignEnd="@+id/edt1"
android:layout_alignRight="@+id/edt1"
android:layout_marginStart="46dp"
android:layout_marginLeft="46dp"
android:layout_toRightOf="@+id/button3"
android:text="+" />
<Button
android:id="@+id/buttonsub"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/buttonadd"
android:layout_alignStart="@+id/buttonadd"
android:layout_alignLeft="@+id/buttonadd"
android:layout_alignEnd="@+id/buttonadd"
android:layout_alignRight="@+id/buttonadd"
android:text="-" />
<Button
android:id="@+id/buttonmul"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/buttonsub"
android:layout_alignStart="@+id/buttonsub"
android:layout_alignLeft="@+id/buttonsub"
android:layout_alignParentEnd="true"
android:layout_alignParentRight="true"
android:text="*" />
<Button
android:id="@+id/button10"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/button7"
android:layout_toLeftOf="@+id/button2"
android:text="." />
<Button
android:id="@+id/button0"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/button8"
android:layout_alignStart="@+id/button8"
android:layout_alignLeft="@+id/button8"
android:text="0" />
<Button
android:id="@+id/buttonC"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/button9"
android:layout_alignStart="@+id/button9"
android:layout_alignLeft="@+id/button9"
android:text="C" />
<Button
android:id="@+id/buttondiv"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/buttonmul"
android:layout_alignStart="@+id/buttonmul"
android:layout_alignLeft="@+id/buttonmul"
android:layout_alignEnd="@+id/buttonmul"
android:layout_alignRight="@+id/buttonmul"
android:text="/" />
<Button
android:id="@+id/buttoneql"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/button0"
android:layout_alignStart="@+id/button10"
android:layout_alignLeft="@+id/button10"
android:layout_alignEnd="@+id/buttondiv"
android:layout_alignRight="@+id/buttondiv"
android:layout_marginTop="37dp"
android:text="=" />
</RelativeLayout>
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Conclusion
We have successfully created a Calculator app in android studio