private void changeDirectory(final File dir) {
        if (dir == null) {
            debug("Could not change folder: dir was null");
        } else if (!dir.isDirectory()) {
            debug("Could not change folder: dir is no directory");
        } else {
            final File[] contents = dir.listFiles();
            if (contents != null) {
                int numDirectories = 0;
                for (final File f : contents) {
                    if (f.isDirectory()) {
                        numDirectories++;
                    }
                }
                mFilesInDir = new File[numDirectories];
                mFilenames.clear();
                for (int i = 0, counter = 0; i < numDirectories; counter++) {
                    if (contents[counter].isDirectory()) {
                        mFilesInDir[i] = contents[counter];
                        mFilenames.add(contents[counter].getName());
                        i++;
                    }
                }
                Arrays.sort(mFilesInDir);
                Collections.sort(mFilenames);
                mSelectedDir = dir;
                mTxtvSelectedFolder.setText(dir.getAbsolutePath());
                mListDirectoriesAdapter.notifyDataSetChanged();
                mFileObserver = createFileObserver(dir.getAbsolutePath());
                mFileObserver.startWatching();
                debug("Changed directory to %s", dir.getAbsolutePath());
            } else {
                debug("Could not change folder: contents of dir were null");
            }
        }
        refreshButtonState();
    }
private void changeDirectory(final File dir) {
        if (dir == null) {
            debug("Could not change folder: dir was null");
        } else if (!dir.isDirectory()) {
            debug("Could not change folder: dir is no directory");
        } else {
            final File[] contents = dir.listFiles();
            if (contents != null) {
                int numDirectories = 0;
                for (final File f : contents) {
                    if (f.isDirectory()) {
                        numDirectories++;
                    }
                }
                mFilesInDir = new File[numDirectories];
                mFilenames.clear();
                for (int i = 0, counter = 0; i < numDirectories; counter++) {
                    if (contents[counter].isDirectory()) {
                        mFilesInDir[i] = contents[counter];
                        mFilenames.add(contents[counter].getName());
                        i++;
                    }
                }
                Arrays.sort(mFilesInDir);
                Collections.sort(mFilenames);
                mSelectedDir = dir;
                mTxtvSelectedFolder.setText(dir.getAbsolutePath());
                mListDirectoriesAdapter.notifyDataSetChanged();
                mFileObserver = createFileObserver(dir.getAbsolutePath());
                mFileObserver.startWatching();
                debug("Changed directory to %s", dir.getAbsolutePath());
            } else {
                debug("Could not change folder: contents of dir were null");
            }
        }
        refreshButtonState();
    }
private void changeDirectory ( final File dir ) { if ( dir == null ) { debug ( "Could not change folder: dir was null" ) ; } else if ( ! dir . isDirectory ( ) ) { debug ( "Could not change folder: dir is no directory" ) ; } else { final File [ ] contents = dir . listFiles ( ) ; if ( contents != null ) { int numDirectories = 0 ; for ( final File f : contents ) { if ( f . isDirectory ( ) ) { numDirectories ++ ; } } mFilesInDir = new File [ numDirectories ] ; mFilenames . clear ( ) ; for ( int i = 0 , counter = 0 ; i < numDirectories ; counter ++ ) { if ( contents [ counter ] . isDirectory ( ) ) { mFilesInDir [ i ] = contents [ counter ] ; mFilenames . add ( contents [ counter ] . getName ( ) ) ; i ++ ; } } Arrays . sort ( mFilesInDir ) ; Collections . sort ( mFilenames ) ; mSelectedDir = dir ; mTxtvSelectedFolder . setText ( dir . getAbsolutePath ( ) ) ; mListDirectoriesAdapter . notifyDataSetChanged ( ) ; mFileObserver = createFileObserver ( dir . getAbsolutePath ( ) ) ; mFileObserver . startWatching ( ) ; debug ( "Changed directory to %s" , dir . getAbsolutePath ( ) ) ; } else { debug ( "Could not change folder: contents of dir were null" ) ; } } refreshButtonState ( ) ; }
Change the directory that is currently being displayed.

@param dir The file the activity should switch to. This File must be
non-null and a directory, otherwise the displayed directory
will not be changed
Change the directory that is currently being displayed .