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A Simple Android Application For Adding Two Numbers

xml code:

<RelativeLayout 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"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.addition.AdditionActivity" >

<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="97dp"
android:text="Addition"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textSize="@dimen/abc_action_bar_default_height_material" />

<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/textView1"
android:layout_marginLeft="20dp"
android:layout_marginTop="43dp"
android:text="Number One"
android:textAppearance="?android:attr/textAppearanceMedium" />

<EditText
android:id="@+id/txtNumber1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/textView2"
android:layout_alignRight="@+id/textView1"
android:ems="2"
android:inputType="number" >

<requestFocus />
</EditText>

<TextView
android:id="@+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/textView2"
android:layout_below="@+id/textView2"
android:layout_marginTop="47dp"
android:text="Number Two"
android:textAppearance="?android:attr/textAppearanceMedium" />

<Button
android:id="@+id/btnAdd"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/textView3"
android:layout_alignRight="@+id/textView3"
android:layout_below="@+id/textView3"
android:layout_marginTop="46dp"
android:text="Add" />

<EditText
android:id="@+id/txtNumber2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@+id/btnAdd"
android:layout_alignLeft="@+id/txtNumber1"
android:ems="2"
android:inputType="number" />

<TextView
android:id="@+id/txtResult"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignRight="@+id/txtNumber2"
android:layout_alignTop="@+id/btnAdd"
android:textAppearance="?android:attr/textAppearanceMedium" />

</RelativeLayout>

Implementing the Addition App

Now, open up the your activity java file from src/com.example.addition. Declare a few variables before the onCreate function.

EditText firstNumber;
EditText secondNumber;
TextView addResult;
Button btnAdd;

double num1,num2,sum;

In the onCreate function once the content view has been set, we’ll read the values entered in the Text Views using an id which we have set in the XML code above.

firstNumber = (EditText)findViewById(R.id.txtNumber1);
secondNumber = (EditText)findViewById(R.id.txtNumber2);
addResult = (TextView)findViewById(R.id.txtResult);
btnAdd = (Button)findViewById(R.id.btnAdd);

When the Add button has been clicked we need to add the values entered in the text boxes, sum it up and render the output in the txtResult text view. So, first we need to add an click listener to the Add button.

btnAdd.setOnClickListener(new OnClickListener() {   
    public void onClick(View v) {
         // code will be here
    }
});

Inside the on click listener, we’ll add the numbers and set the sum to the txtResult Text View.

btnAdd.setOnClickListener(new OnClickListener() {
            
    public void onClick(View v) {
        num1 = Double.parseDouble(firstNumber.getText().toString());
        num2 = Double.parseDouble(secondNumber.getText().toString());
        sum = num1 + num2;
        addResult.setText(Double.toString(sum));
    }
});

Save the above changes and run the application. You should have the addition app running. Input the two numbers and you should be above to view the result in the Text View.