Simplest Android App

Here is one of the simplest Android App:

Temperature Converter - It converts Temperature from Degree Celsius to Degree Fahrenheit and vice versa.

Tha App can be found in Market at :


https://play.google.com/store/apps/details?id=ind.zaki.android.temp.converter



Here is the code:


Androidmanifest.xml


<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="ind.zaki.android.temp.converter"
    android:versionCode="2"
    android:versionName="2.0"
    android:installLocation="auto"
     >

    <uses-sdk android:minSdkVersion="10" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:label="@string/app_name"
            android:name=".DtoFActivity" >
            <intent-filter >
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>





DToFActivity.java

package ind.zaki.android.temp.converter;

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

public class DtoFActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

((Button) findViewById(R.id.calculate))
.setOnClickListener(new Button.OnClickListener() {
public void onClick(View arg0) {

final EditText degreesText = (EditText) DtoFActivity.this
.findViewById(R.id.degrees);

final EditText fahrenheitText = (EditText) DtoFActivity.this
.findViewById(R.id.fahrenheit);

if (!"".equals(degreesText.getText().toString())) {
fahrenheitText.setText(String.valueOf((Float
.valueOf(degreesText.getText().toString()) * 9 / 5) + 32));
}
}
});

((Button) findViewById(R.id.calculate2))
.setOnClickListener(new Button.OnClickListener() {
public void onClick(View arg0) {

final EditText degreesText = (EditText) DtoFActivity.this
.findViewById(R.id.degrees);

final EditText fahrenheitText = (EditText) DtoFActivity.this
.findViewById(R.id.fahrenheit);

if (!"".equals(fahrenheitText.getText().toString())) {
degreesText.setText(String.valueOf((Float
.valueOf(fahrenheitText.getText()
.toString()) - 32) * 5 / 9));
}
}
});

}
}




main.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical"
    android:background="@drawable/background">

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/degrees" />

    <EditText
        android:id="@+id/degrees"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:inputType="phone" >

        <requestFocus />
    </EditText>

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/fahrenheit" />

    <EditText
        android:id="@+id/fahrenheit"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:inputType="phone" />

    <Button
        android:id="@+id/calculate"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Degrees to FahrenHeit" />

    <Button
        android:id="@+id/calculate2"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="FahrenHeit to Degrees" />

</LinearLayout>