How to change images on imageView after some interval

public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);``
//
//
int []imageArray={R.drawable.img1,R.drawable.img2,R.drawable.img3};


final Handler handler = new Handler();
         Runnable runnable = new Runnable() {
            int i=0;
            public void run() {
                imageView.setImageResource(imageArray[i]);
                i++;
                if(i>imageArray.length-1)
                {
                i=0;    
                }
                handler.postDelayed(this, 50);  //for interval...
            }
        };
        handler.postDelayed(runnable, 2000); //for initial delay..
    }

Change text size/font size of a tabhost?

You can define themes, use styles to achieve this:

First you create the theme (name:CustomTheme) for your Activity in your res/styles.xml:

<style name="CustomTheme" parent="@android:style/Theme">
    <item name="android:tabWidgetStyle">@style/CustomTabWidget</item>
</style>
<style name="CustomTabWidget" parent="@android:style/Widget.TabWidget">
    <item name="android:textAppearance">@style/CustomTabWidgetText</item>
</style>
<style name="CustomTabWidgetText" 
    parent="@android:style/TextAppearance.Widget.TabWidget">
    <item name="android:textSize">20sp</item>
    <item name="android:textStyle">bold</item>
</style>

Then in your androidManifest.xml you specify the theme above for your TabActivity orActivity containing your TabWidget:

<activity android:name="MyTabActivity" android:theme="@style/CustomTheme">

This will serve you with the output you want (of course you should change the size and style for your preference).

http://stackoverflow.com/questions/5788971/how-to-change-the-font-size-of-tabhost-in-android

Check internet connection on Android Phone

public boolean isInternetAvailable(){
//If not in activity
// ConnectivityManager cManager = (ConnectivityManager) Context.getSystemService(Context.CONNECTIVITY_SERVICE);

//if in Activity
ConnectivityManager cManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo nInfo = cManager.getActiveNetworkInfo();
if(nInfo == null)
return false;
else
return nInfo.isConnected();
}




and onclick event

 if(isInternetAvailable()){
        do something
        }else {
       
        Toast.makeText(getApplicationContext(), "You must be connected to the internet", Toast.LENGTH_LONG).show();
        }

List view

first xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:ads="http://schemas.android.com/apk/lib/com.google.ads"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >
     <com.google.ads.AdView android:id="@+id/adView"
                         android:layout_width="wrap_content"
                         android:layout_height="60dp"
                         ads:adUnitId="id"
                         ads:adSize="BANNER"
                       
                         ads:loadAdOnCreate="true"/>

 
    <!-- List View -->
    <ListView
        android:id="@+id/list_view"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />
 
</LinearLayout>

2xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
   
    <!-- Single ListItem -->
   
    <!-- Product Name -->

    <TextView
        android:id="@+id/product_name"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:background="@drawable/ylistbg"
        android:padding="10dip"
        android:textSize="16dip"
        android:textStyle="bold" />

</LinearLayout>

jav

public class ListviewOnclickExample extends Activity

02

{

03	private ListView lv1;

04	private String lv_arr[]={"Android","iPhone","BlackBerry","AndroidPeople","J2ME","Listview","ArrayAdapter","ListItem","Us","UK","India"};

05

@Override

06	public void onCreate(Bundle icicle)

07

{

08	super.onCreate(icicle);

09	setContentView(R.layout.main);

10	lv1=(ListView)findViewById(R.id.ListView01);

11	lv1.setAdapter(new ArrayAdapter(this,android.R.layout.slist_item, R.id.product_name, listdisplay));

12

13	lv1.setOnItemClickListener(new OnItemClickListener() {

14

@Override

15	public void onItemClick(AdapterView a, View v, int position, long id) {

16

TextView textView = (TextView)arg1.findViewById(R.id.product_name);

textt  = textView.getText().toString();

21

}

22

});

23

}

24

}