Hello World in Android
Create “Hello World” application. That will display “Hello World” in the middle of the screen in the red color with white background.
File Name : HelloStudentsActivity.java
package bsr.example;
import android.app.Activity;
import android.os.Bundle;
public class HelloStudentsActivity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
}
Layout : main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:weightSum="1" android:layout_height="match_parent" android:layout_width="match_parent" android:orientation="vertical" android:background="@color/bgCol">
<TextView android:layout_height="wrap_content" android:text="@string/hello" android:layout_width="fill_parent"></TextView>
<TextView android:id="@+id/textView1" android:gravity="center_vertical|center_horizontal" android:freezesText="true" android:textColor="@color/fCol" android:textSize="12pt" android:layout_height="match_parent" android:layout_width="match_parent" android:layout_weight="0.35" android:text="Hello World"></TextView>
</LinearLayout>
Layout : string.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="hello">Rupadiya Bipin, www.BipinRupadiya.blogspot.com</string><string name="app_name">SL-MC, Exercise 1</string>
<color name="fCol">#FF0000</color>
<color name="bgCol">#FFFFFF</color>
</resources>
File Name : AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="bsr.example"
android:versionCode="1"
android:versionName="1.0">
<uses-sdk android:minSdkVersion="8" />
<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name=".HelloStudentsActivity"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>