Show ProgressDialog Android

Question

I have an EditText which takes a String from the user and a searchButton  When the searchButton is clicked  it will search through the XML file and display it in the ListView   I am able to take input from the user  search through the XML file and display the usersearched value in the ListView also   What I want is to display a ProgressDialog after the searchButton is clicked like  PLEASE WAIT   RETRIEVING DATA     or something like that and dismiss it when the data is shown   public class Tab1Activity extends ListActivity   private Button okButton  private Button searchButton  Toast toast  String xml   private TextView searchText  private String searchTextString  HashMap lt String  String gt  o  ArrayList lt HashMap lt String  String gt  gt  mylist   new ArrayList lt HashMap lt String  String gt  gt       Override public void onCreate Bundle savedInstanceState        super onCreate savedInstanceState       setContentView R layout tab1        searchButton    Button  findViewById R id search button       searchButton setOnClickListener new View OnClickListener              public void onClick View v                   TODO Auto-generated method stub             System out print  hello                 searchText    TextView  findViewById R id search text               searchTextString   searchText getText   toString                readXml searchTextString                          private void readXml String searchTextString1        ArrayList lt HashMap lt String  String gt  gt  mylist   new ArrayList lt HashMap lt String  String gt  gt          String xml   XMLfunctions getXML                  Here XMLfunctions is class name which parse xml     Document doc   XMLfunctions XMLfromString xml        int numResults   XMLfunctions numResults doc        if   numResults  lt   0             Toast makeText Tab1Activity this   Testing xmlparser                   Toast LENGTH LONG  show            finish               NodeList nodes   doc getElementsByTagName  result         for  int i   0  i  lt  nodes getLength    i              HashMap lt String  String gt  map   new HashMap lt String  String gt              Element e    Element  nodes item i           String nameMapString   XMLfunctions getValue e   name                if   nameMapString toLowerCase   indexOf searchTextString1 toLowerCase       -1           -1 means string is present in the search string                               map put  id   XMLfunctions getValue e   id                     map put  name    XMLfunctions getValue e   name                     map put  Score    XMLfunctions getValue e   score                     mylist add map                            ListAdapter adapter   new SimpleAdapter this  mylist              R layout parsexml  new String      name    Score     new int                         R id item title  R id item subtitle          setListAdapter adapter        final ListView lv   getListView        lv setTextFilterEnabled true       lv setOnItemClickListener new OnItemClickListener             public void onItemClick AdapterView lt   gt  parent  View view                  int position  long id                 SuppressWarnings  unchecked               HashMap lt String  String gt  o    HashMap lt String  String gt   lv                      getItemAtPosition position                     Toast makeText Tab1Activity this                            Name   o get  name      Clicked   Toast LENGTH LONG                           show

User · Answer

While creating the object for the progressbar check the following.

This fails:

dialog = new ProgressDialog(getApplicationContext());

While adding the activities context works..

dialog = new ProgressDialog(MainActivity.this);

User · Answer

Declare your progress dialog   ProgressDialog progress    When you re ready to start the progress dialog   progress   ProgressDialog show this   dialog title        dialog message   true     and to make it go away when you re done   progress dismiss        Here s a little thread example for you      Note  declare ProgressDialog progress as a field in your class   progress   ProgressDialog show this   dialog title      dialog message   true    new Thread new Runnable        Override   public void run              do the thing that takes a long time      runOnUiThread new Runnable            Override       public void run                   progress dismiss                           start

User · Answer

You should not execute resource intensive tasks in the main thread  It will make the UI unresponsive and you will get an ANR  It seems like you will be doing resource intensive stuff and want the user to see the ProgressDialog  You can take a look at http   developer android com reference android os AsyncTask html to do resource intensive tasks  It also shows you how to use a ProgressDialog

User · Answer

I am using the following code in one of my current projects where i download data from the internet  It is all inside my activity class      ---------------------------- START DownloadFileAsync    -----------------------   class DownloadFileAsync extends AsyncTask lt String  String  String gt          Override     protected void onPreExecute             super onPreExecute               DIALOG DOWNLOAD PROGRESS is defined as 0 at start of class         showDialog DIALOG DOWNLOAD PROGRESS               Override     protected String doInBackground String    urls            try               String xmlUrl   urls 0                URL u   new URL xmlUrl               HttpURLConnection c    HttpURLConnection  u openConnection                c setRequestMethod  GET                c setDoOutput true               c connect                 int lengthOfFile   c getContentLength                 InputStream in   c getInputStream                 byte   buffer   new byte 1024               int len1   0              long total   0               while   len1   in read buffer    gt  0                    total    len1     total   total   len1                 publishProgress       int    total   100    lengthOfFile                    xmlContent    buffer                          catch  Exception e                Log d  Downloader   e getMessage                       return null             protected void onProgressUpdate String    progress            Log d  ANDRO ASYNC   progress 0            mProgressDialog setProgress Integer parseInt progress 0                 Override     protected void onPostExecute String unused            dismissDialog DIALOG DOWNLOAD PROGRESS              Override protected Dialog onCreateDialog int id        switch  id        case DIALOG DOWNLOAD PROGRESS          mProgressDialog   new ProgressDialog this           mProgressDialog setMessage  Retrieving latest announcements               mProgressDialog setIndeterminate false           mProgressDialog setMax 100           mProgressDialog setProgressStyle ProgressDialog STYLE HORIZONTAL           mProgressDialog setCancelable true           mProgressDialog show            return mProgressDialog      default          return null

User · Answer

I am using the following code in one of my current projects where i download data from the internet  It is all inside my activity class   private class GetData extends AsyncTask lt String  Void  JSONObject gt              Override         protected void onPreExecute                 super onPreExecute                 progressDialog   ProgressDialog show Calendar this                                                    Override         protected JSONObject doInBackground String    params                 String response               try                    HttpClient httpclient   new DefaultHttpClient                     HttpPost httppost   new HttpPost url                    HttpResponse responce   httpclient execute httppost                    HttpEntity httpEntity   responce getEntity                     response   EntityUtils toString httpEntity                    Log d  response is   response                    return new JSONObject response                  catch  Exception ex                     ex printStackTrace                                return null                      Override         protected void onPostExecute JSONObject result                         super onPostExecute result                progressDialog dismiss                 if result    null                                try                                       JSONObject jobj   result getJSONObject  result                         String status   jobj getString  status                         if status equals  true                                                  JSONArray array   jobj getJSONArray  data                             for int x   0  x  lt  array length    x                                                          HashMap lt String  String gt  map   new HashMap lt String  String gt                                  map put  name   array getJSONObject x  getString  name                                  map put  date   array getJSONObject x  getString  date                                  map put  description   array getJSONObject x  getString  description                                  list add map                                                      CalendarAdapter adapter   new CalendarAdapter Calendar this  list                            list of calendar setAdapter adapter                                                           catch  Exception e                                         e printStackTrace                                                else                               Toast makeText Calendar this   Network Problem   Toast LENGTH LONG  show                                     and execute it in OnCreate Method like new GetData   execute     where Calendar is my calendarActivity and i have also created a CalendarAdapter to set these values to a list view

[android] Show ProgressDialog Android

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