Android Part I Calculation

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.mycompany.myapplication" >

    <application        android:allowBackup="true"        android:icon="@mipmap/ic_launcher"        android:label="@string/app_name"        android:supportsRtl="true"        android:theme="@style/AppTheme" >
        <activity            android:name=".MainActivity"            android:label="@string/app_name"            android:theme="@style/AppTheme.NoActionBar" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

MainActivity

package com.mycompany.myapplication;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.Toast;

public class MainActivity extends Activity {
    private EditText text;

    @Override    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        text = (EditText) findViewById(R.id.inputValue);

    }

    // this method is called at button click because we assigned the name to the    // "OnClick" property of the button    public void onClick(View view) {
        switch (view.getId()) {
            case R.id.button1:
                RadioButton celsiusButton = (RadioButton) findViewById(R.id.radio0);
                RadioButton fahrenheitButton = (RadioButton) findViewById(R.id.radio1);
                if (text.getText().length() == 0) {
                    Toast.makeText(this, "Please enter a valid number",
                            Toast.LENGTH_LONG).show();
                    return;
                }

                float inputValue = Float.parseFloat(text.getText().toString());
                if (celsiusButton.isChecked()) {
                    text.setText(String
                            .valueOf(ConverterUtil.convertFahrenheitToCelsius(inputValue)));
                    celsiusButton.setChecked(false);
                    fahrenheitButton.setChecked(true);
                } else {
                    text.setText(String
                            .valueOf(ConverterUtil.convertCelsiusToFahrenheit(inputValue)));
                    fahrenheitButton.setChecked(false);
                    celsiusButton.setChecked(true);
                }
                break;
        }
    }

}

ConverterUtil.java

package com.mycompany.myapplication;
public class ConverterUtil {

    // converts to celsius    public static float convertFahrenheitToCelsius(float fahrenheit) {
        return ((fahrenheit - 32) * 5 / 9);
    }

    // converts to fahrenheit    public static float convertCelsiusToFahrenheit(float celsius) {
        return ((celsius * 9) / 5) + 32;
    }

}
 

 activity_main.xml

<LinearLayout 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:orientation="vertical"    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=".MainActivity"    android:background="@color/myColor">


    <EditText        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:id="@+id/inputValue"        android:inputType="numberSigned|numberDecimal"/>

    <RadioGroup        android:id="@+id/radioGroup1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignStart="@+id/editText1"        android:layout_below="@+id/editText1">

        <RadioButton            android:id="@+id/radio0"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:checked="true"            android:text="@string/celsius" />

        <RadioButton            android:id="@+id/radio1"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="@string/fahrenheit" />
    </RadioGroup>

    <Button        android:id="@+id/button1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignStart="@+id/radioGroup1"        android:layout_below="@+id/radioGroup1"        android:layout_marginTop="22dp"        android:text="@string/calc"        android:onClick="onClick"/>

</LinearLayout>  

 strings.xml

<?xml version="1.0" encoding="utf-8"?><resources>
    <string name="app_name">Temperature Converter</string>
    <string name="action_settings">Settings</string>
    <string name="hello_world">Hello world!</string>
    <color name="myColor">#F5F5F5</color>
    <string name="celsius">to Celsius</string>
    <string name="fahrenheit">to Fahrenheit</string>
    <string name="calc">Calculate</string>

</resources>