This is another simple android application which converts temperature into Celsius and Fahrenheit. Here we are taking a temperature value in edit text box and checking radio buttons and converting into checked temperature. So, create your new project and drop one edit box, two radio buttons, one text view and one simple button. The code of android XML file is given below:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/ll"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">
<EditText
android:id="@+id/editText1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="numberDecimal" >
</EditText>
<TextView
android:id="@+id/result"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="30sp" />
<RadioGroup
android:id="@+id/radioGroup1"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<RadioButton
android:id="@+id/cb"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:checked="true"
android:text="Celcius"/>
<RadioButton
android:id="@+id/fb"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Fahrenhiet" />
</RadioGroup>
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="add"
android:text="Convert"
android:textSize="30sp" />
</LinearLayout>
Now open your Java file and initialize all objects. Get value from edit text box in a double type variable and convert into given temperature according to checked radio button and display it to text view. The code of android Java file is given with explanation:
packagecom.innosen; //your package name
importandroid.os.Bundle;
importandroid.view.View;
importandroid.widget.EditText;
importandroid.widget.LinearLayout;
importandroid.widget.RadioButton;
importandroid.widget.TextView;
importandroid.app.Activity;
importandroid.graphics.Color;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void add(View v)
{
LinearLayout ll=(LinearLayout)findViewById(R.id.ll);
TextView result=(TextView)findViewById(R.id.result);
EditText et1=(EditText)findViewById(R.id.editText1);
//get value from edit text box and convert into double
double a=Double.parseDouble(String.valueOf(et1.getText()));
RadioButton cb=(RadioButton)findViewById(R.id.cb);
RadioButton fb=(RadioButton)findViewById(R.id.fb);
//check which radio button is checked
if(cb.isChecked())
{
//change background colour
ll.setBackgroundColor(Color.YELLOW);
//display conversion
result.setText(f2c(a)+" degree C");
//cb.setChecked(false);
fb.setChecked(true);
}
else
{
ll.setBackgroundColor(Color.CYAN);
result.setText(c2f(a)+" degree F");
//fb.setChecked(false);
cb.setChecked(true);
}
}
//Celcius to Fahrenhiet method
private double c2f(double c)
{
return (c*9)/5+32;
}
//Fahrenhiet to Celcius method
private double f2c(double f)
{
return (f-32)*5/9;
}
}Now run your project and test application. If you have any doubt please comment.
Share and help other. Thanks... :)
