Android Program : Create an Android Application to accept two numbers and find power and Average. Display the result on the next activity on Button click.
Soln :
activity_main.xml.
<!--The activity_main.xml is a layout file
an XML-based layout is a file that defines
the different widgets to be used in the UI
and the relations between those widgets
and their containers. -->
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"
tools:layout_editor_absoluteY="81dp">
<!-- Text view for result view-->
<TextView
android:id="@+id/textView_answer"
android:layout_width="100dp"
android:layout_height="25dp"
android:layout_marginLeft="130dp"
android:layout_marginTop="300dp"
android:text="0"
android:textSize="20dp"
android:textStyle="bold" />
<!--take the input first number-->
<EditText
android:id="@+id/editText_first_no"
android:layout_width="150dp"
android:layout_height="40dp"
android:layout_marginLeft="200dp"
android:layout_marginTop="40dp"
android:inputType="number" />
<!-- for message input first number-->
<TextView
android:id="@+id/textView_first_no"
android:layout_width="150dp"
android:layout_height="25dp"
android:layout_marginLeft="10dp"
android:layout_marginTop="50dp"
android:text="First number"
android:textSize="20dp" />
<!--view message -->
<TextView
android:id="@+id/textView_second_no"
android:layout_width="150dp"
android:layout_height="25dp"
android:layout_marginLeft="10dp"
android:layout_marginTop="100dp"
android:text="Second number"
android:textSize="20dp" />
<!-- take input for second number -->
<EditText
android:id="@+id/editText_second_no"
android:layout_width="150dp"
android:layout_height="40dp"
android:layout_marginLeft="200dp"
android:layout_marginTop="90dp"
android:inputType="number"
tools:ignore="MissingConstraints" />
<!-- button for run add logic and view result -->
<Button
android:id="@+id/add_button"
android:layout_width="100dp"
android:layout_height="50dp"
android:layout_marginLeft="110dp"
android:layout_marginTop="200dp"
android:text="ADD" />
</RelativeLayout>
MainActivity.java
// Each new activity has its own layout and Java files,
// here we build the logic for adding two number
package org.geeksforgeeks.addtwonumbers;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
// define the global variable
// variable number1, number2 for input input number
// Add_button, result textView
EditText number1;
EditText number2;
Button Add_button;
TextView result;
int ans=0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// by ID we can use each component which id is assign in xml file
number1=(EditText) findViewById(R.id.editText_first_no);
number2=(EditText) findViewById(R.id.editText_second_no);
Add_button=(Button) findViewById(R.id.add_button);
result = (TextView) findViewById(R.id.textView_answer);
// Add_button add clicklistener
Add_button.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// num1 or num2 double type
// get data which is in edittext, convert it to string
// using parse Double convert it to Double type
double num1 = Double.parseDouble(number1.getText().toString());
double num2 = Double.parseDouble(number2.getText().toString());
// add both number and store it to sum
double sum = num1 + num2;
// set it ot result textview
result.setText(Double.toString(sum));
}
});
}
}
output
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