Skip to main content

Show a progress dialog when a thread is running

  We can easily show a progress dialog with Async task. But asyn task has its own drawbacks. There can be no ui's and the task can be executed only once.
   Better way is to use a thread for lengthy processing and show a progess dialog in the ui thread. (I struggled quite a bit. My progress dialog would keep on spinning infinitely :-( )


//this is your main activity thread
handler = new FeedReadHandler();

pd =,"Loading","Loading the file. please wait...");
Thread background = new Thread(new Runnable(){     

                        public void run() {
                            Message msg = handler.obtainMessage();

  Now you are starting a progress dialog and then starting the thread called background to run the function readFeed. When the function is completed, the thread sends a message to the handler.

Here is the handler code
 public class FeedReadHandler extends Handler{
       public void handleMessage(Message msg){
           Log.d("SHOWRSS","i think i received a message");


So the handler when receives the message from our background thread, on receiving this message it closes the progress- dialog.


Popular posts from this blog

Simple ListView Adapter and list item select

When you are using a listview in your applications many a times you will write your own adapter to display item. But if your list is very simple showing a list of strings, you can use inbuilt adapters like ArrayAdapter, SimpleCursorAdapter etc.

ArrayAdapterLet us look at an example

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <ListView android:layout_height="wrap_content" android:id="@+id/listView1" android:layout_width="match_parent" android:layout_margin="20dp"> </ListView> </LinearLayout>

And add these lines to the onCreate method of the activity.

super.onCreate(savedInstanceState); …

Drawables in Android - Layer drawable

Let us see how to use layer drawable. You can have two or more bitmaps on different layers to create such a drawable

Using xml:

You should use layer-list in your xml file to create layerdrawable. Here is layer.xml
<?xml version="1.0" encoding="utf-8"?> <layer-list xmlns:android=""> <item> <bitmap android:src="@drawable/whiteicon" android:gravity="top|left"/> </item> <item> <bitmap android:src="@drawable/blueicon" android:gravity="top|left"/> </item> <item> <bitmap android:src="@drawable/redicon" android:gravity="top|left"/> </item> </layer-list>
We are using three different bitmaps whiteicon.png, redicon.png and blueicon.png which are present in /res/drawable/mdpi folder. All these are of different sizes and aligned to top left. This drawab…

DatePickers in Android

DatePicker is a view which lets the user select a date showing a calendar or 3 spinners for dd, mm and yy.

Let us see how to use this.
Easy Method: To use a DatePicker you can use DatePickerDialog. This can be created and shown programmatically too.

publicvoidonCreate(Bundle b){/*********/ Button btn =(Button)findViewById(; btn.setOnClickListener(new View.OnClickListener(){@OverridepublicvoidonClick(View v){ showPickerDialog();}});}privatevoidshowPickerDialog(){ DatePickerDialog dtPickerDlg =new DatePickerDialog(this,this, 2017,10,20);;}

In our xml file, let us have a button and in the onclick listener of the button, let us display the date picker dialog - we call showPickerDialog.

In showPickerDialog,  we are using a random date to initialize.

The first  parameter is the context. Second parameter is the class which implements the interface OnDateSetListener. Next three parameters are year, month (Jan is 0) and …