StackOverflow2013

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7250173
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0
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0
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2011-08-30T21:43:13.620
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2011-08-30T21:43:13.620
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914587
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7208925
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text
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I was hoping the progress dialog would be displayed and remain displayed while the bitmap files were decoded. Also, I did not realize that the main thread in Android is the UI thread, and the UI is frozen while processing occurs on the main thread! I used a background thread and now the progress dialog is displayed correctly: public class ActivityProgressBar extends ListActivity { <pre><code>private Vector<RowFileData> fileDataDisplay = null; RowFileData fileData; ProgressDialog progressDialog = null; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.list); progressDialog = new ProgressDialog(this); progressDialog.setMessage("Loading thumbnails..."); fileDataDisplay = new Vector<RowFileData>(); File currentDirectory = new File("/mnt/sdcard/dcim/camera"); BitmapFactory.Options opts = new BitmapFactory.Options(); opts.inSampleSize = 16; File[] currentDirectoryFileList = currentDirectory.listFiles(); progressDialog.show(); readThumbnails(currentDirectoryFileList, opts); } private void readThumbnails(final File[] currentDirectoryFileList, final BitmapFactory.Options opts) { Thread backgroundThread = new Thread() { public void run() { try { for(int i=0; i<currentDirectoryFileList.length; i++) { File currentDirectoryFile = currentDirectoryFileList[i]; fileData = new RowFileData(BitmapFactory.decodeFile(currentDirectoryFile.getPath(), opts), currentDirectoryFile.getPath()); fileDataDisplay.add(fileData); Log.v("myLog", "inside for loop"); } uiCallback.sendEmptyMessage(0); } catch(Exception ex) { Log.v("myLog", ex.toString()); } } }; backgroundThread.start(); } private Handler uiCallback = new Handler() { @Override public void handleMessage(Message emptyMessage) { progressDialog.dismiss(); } }; private class RowFileData { protected Bitmap rowBitmap; protected String rowFileName; RowFileData(Bitmap bitmapPreview, String fileName) { rowBitmap = bitmapPreview; rowFileName = fileName; } } </code></pre> }
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PostAcceptedAnswerId
1. This table or related slice is empty.
PostParentId
1. POAndroid BitmapFactory decodeFile is called before it should be
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 PTQuestion
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1. PTAnswer
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1. This table or related slice is empty.
UserOwnerUserId
1. USLou Morda
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A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.