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POHow to use a progress bar when my app is reading data from a file ? Right before the start of the application
 

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  1. POHow to use a progress bar when my app is reading data from a file ? Right before the start of the application
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    <p>I am trying to write an application, where many rows of data are being extracted from a text file. This is done when i start the application. I want to show a progress bar to the user, when he clicks on the application in my applications screen. Right now there is a black screen for a brief period and then it shows the application data and displays the data. I want add a progress bar starting from 0 to 100 or just telling the user that my application is loading.</p> <p>Can anybody help me in adding a progress bar to code as i am new to this. I would appreciate all the help which is given to me. Thanks in advance.</p> <pre><code>public class MovieRatingsActivity extends ListActivity { private ArrayList&lt;Movie&gt; movies = new ArrayList&lt;Movie&gt;(); private LayoutInflater mInflater; private LruCache&lt;String, Bitmap&gt; cache; /** Called when the activity is first created. */ public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); initializeUI(); } private void initializeUI() { mInflater = (LayoutInflater) this.getSystemService(Context.LAYOUT_INFLATER_SERVICE); InputStream inputStream = getResources().openRawResource( R.raw.ratings); movies = Movie.loadFromFile(inputStream); setListAdapter(new RowIconAdapter(this, R.layout.listrow, R.id.row_label, movies)); } static class ViewHolder { TextView votesText; TextView movieText; ImageView icon; } /** Custom row adatper -- that displays an icon next to the movie name */ class RowIconAdapter extends ArrayAdapter&lt;Movie&gt; { private ArrayList&lt;Movie&gt; movies; public RowIconAdapter(Context c, int rowResourceId, int textViewResourceId, ArrayList&lt;Movie&gt; items) { super(c, rowResourceId, textViewResourceId, items); movies = items; } public View getView(int pos, View convertView, ViewGroup parent) { ViewHolder holder; Movie currMovie = movies.get(pos); if (convertView == null) { convertView = mInflater.inflate(R.layout.listrow, parent, false); holder = new ViewHolder(); holder.icon = (ImageView) convertView.findViewById(R.id.row_icon); holder.movieText = (TextView) convertView.findViewById(R.id.row_label); holder.votesText = (TextView) convertView.findViewById(R.id.row_subtext); holder.movieText.setText(currMovie.getName()); String votesStr = currMovie.getVotes()+" votes"; holder.votesText.setText(votesStr); Bitmap movieIcon = getMovieIcon(currMovie.getName(), currMovie.getRating()); holder.icon.setImageBitmap(movieIcon); Log.w("MVMVMVMVMVMV", "Creating row view at position "+pos+" movie "+currMovie.getName()); } return convertView; } } /** Creates a unique movie icon based on name and rating */ private Bitmap getMovieIcon(String movieName, String movieRating) { int bgColor = getColor(movieName); Bitmap b = Bitmap.createBitmap(48, 48, Bitmap.Config.ARGB_8888); b.eraseColor(bgColor); // fill bitmap with the color Canvas c = new Canvas(b); Paint p = new Paint(); p.setAntiAlias(true); p.setColor(getTextColor(bgColor)); p.setTextSize(24.0f); c.drawText(movieRating, 8, 32, p); return b; } /** Construct a color from a movie name */ private int getColor(String name) { String hex = toHexString(name); String red = "#"+hex.substring(0,2); String green = "#"+hex.substring(2,4); String blue = "#"+hex.substring(4,6); String alpha = "#"+hex.substring(6,8); int color = Color.argb(Integer.decode(alpha), Integer.decode(red), Integer.decode(green), Integer.decode(blue)); return color; } /** Given a movie name -- generate a hex value from its hashcode */ private String toHexString(String name) { int hc = name.hashCode(); String hex = Integer.toHexString(hc); if (hex.length() &lt; 8) { hex = hex+hex+hex; hex = hex.substring(0,8); // use default color value } return hex; } /** Crude optimization to obtain a contrasting color -- does not work well yet */ private int getTextColor(int bg) { int r = Color.red(bg); int g = Color.green(bg); int b = Color.blue(bg); String hex = Integer.toHexString(r)+Integer.toHexString(g); hex += Integer.toHexString(b); int cDec = Integer.decode("#"+hex); if (cDec &gt; 0xFFFFFF/2) // go dark for lighter shades return Color.rgb(0, 0, 0); else { r = (r+128)%256; g = (g+128)%256; b = (b+128)%256; return Color.rgb(r,g,b); } } } </code></pre>
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