Create a Simple Application that performs Arithmetic Operations. (Use constraint layout)
Soln :
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_alignEnd="@+id/button4"
android:layout_alignRight="@+id/button4"
android:layout_below="@+id/edt1"
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_toLeftOf="@+id/button3"
android:layout_toStartOf="@+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_alignBottom="@+id/button4"
android:layout_alignLeft="@+id/button2"
android:layout_alignStart="@+id/button2"
android:text="5" />
<Button
android:id="@+id/button6"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/button3"
android:layout_alignStart="@+id/button3"
android:layout_below="@+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_alignLeft="@+id/button5"
android:layout_alignStart="@+id/button5"
android:layout_below="@+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_alignLeft="@+id/button6"
android:layout_alignStart="@+id/button6"
android:layout_below="@+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_alignEnd="@+id/edt1"
android:layout_alignRight="@+id/edt1"
android:layout_alignTop="@+id/button3"
android:layout_marginLeft="46dp"
android:layout_marginStart="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_alignEnd="@+id/buttonadd"
android:layout_alignLeft="@+id/buttonadd"
android:layout_alignRight="@+id/buttonadd"
android:layout_alignStart="@+id/buttonadd"
android:layout_below="@+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_alignLeft="@+id/buttonsub"
android:layout_alignParentEnd="true"
android:layout_alignParentRight="true"
android:layout_alignStart="@+id/buttonsub"
android:layout_below="@+id/buttonsub"
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_alignLeft="@+id/button8"
android:layout_alignStart="@+id/button8"
android:layout_below="@+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_alignLeft="@+id/button9"
android:layout_alignStart="@+id/button9"
android:layout_below="@+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_alignEnd="@+id/buttonmul"
android:layout_alignLeft="@+id/buttonmul"
android:layout_alignRight="@+id/buttonmul"
android:layout_alignStart="@+id/buttonmul"
android:layout_below="@+id/buttonmul"
android:text="/" />
<Button
android:id="@+id/buttoneql"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignEnd="@+id/buttondiv"
android:layout_alignLeft="@+id/button10"
android:layout_alignRight="@+id/buttondiv"
android:layout_alignStart="@+id/button10"
android:layout_below="@+id/button0"
android:layout_marginTop="37dp"
android:text="=" />
</RelativeLayout>
MainActivity.java
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
public class MainActivity extends AppCompatActivity {
Button button0, button1, button2, button3, button4, button5, button6,
button7, button8, button9, buttonAdd, buttonSub, buttonDivision,
buttonMul, button10, buttonC, buttonEqual;
EditText calEditText;
float mValueOne, mValueTwo;
boolean Addition, mSubtract, Multiplication, Division;
@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);
calEditText = (EditText) findViewById(R.id.edt1);
button1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
calEditText.setText(calEditText.getText() + "1");
}
});
button2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
calEditText.setText(calEditText.getText() + "2");
}
});
button3.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
calEditText.setText(calEditText.getText() + "3");
}
});
button4.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
calEditText.setText(calEditText.getText() + "4");
}
});
button5.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
calEditText.setText(calEditText.getText() + "5");
}
});
button6.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
calEditText.setText(calEditText.getText() + "6");
}
});
button7.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
calEditText.setText(calEditText.getText() + "7");
}
});
button8.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
calEditText.setText(calEditText.getText() + "8");
}
});
button9.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
calEditText.setText(calEditText.getText() + "9");
}
});
button0.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
calEditText.setText(calEditText.getText() + "0");
}
});
buttonAdd.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (calEditText == null) {
calEditText.setText("");
} else {
mValueOne = Float.parseFloat(calEditText.getText() + "");
Addition = true;
calEditText.setText(null);
}
}
});
buttonSub.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mValueOne = Float.parseFloat(calEditText.getText() + "");
mSubtract = true;
calEditText.setText(null);
}
});
buttonMul.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mValueOne = Float.parseFloat(calEditText.getText() + "");
Multiplication = true;
calEditText.setText(null);
}
});
buttonDivision.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mValueOne = Float.parseFloat(calEditText.getText() + "");
Division = true;
calEditText.setText(null);
}
});
buttonEqual.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mValueTwo = Float.parseFloat(calEditText.getText() + "");
if (Addition == true) {
calEditText.setText(mValueOne + mValueTwo + "");
Addition = false;
}
if (mSubtract == true) {
calEditText.setText(mValueOne - mValueTwo + "");
mSubtract = false;
}
if (Multiplication == true) {
calEditText.setText(mValueOne * mValueTwo + "");
Multiplication = false;
}
if (Division == true) {
calEditText.setText(mValueOne / mValueTwo + "");
Division = false;
}
}
});
buttonC.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
calEditText.setText("");
}
});
button10.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
calEditText.setText(calEditText.getText() + ".");
}
});
}
}
output
){kind=link}
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