FileUtils.java

/**
	 * Attempts to open a file for viewing.
	 * 
	 * @param fileholder The holder of the file to open.
	 */
	public static void openFile(FileHolder fileholder, Context c) {
		Intent intent = new Intent(android.content.Intent.ACTION_VIEW);

		Uri data = FileUtils.getUri(fileholder.getFile());
		String type = fileholder.getMimeType();
		
		if ("*/*".equals(type)){
			intent.setData(data);
            intent.putExtra(FileManagerIntents.EXTRA_FROM_OI_FILEMANAGER, true);
		} else {
			intent.setDataAndType(data, type);
		}
		
		

		try {
            List<ResolveInfo> activities = c.getPackageManager().queryIntentActivities(intent, PackageManager.GET_ACTIVITIES);
            if (activities.size() == 0 || (activities.size() == 1 && c.getApplicationInfo().packageName.equals(activities.get(0).activityInfo.packageName))){
                Toast.makeText(c, R.string.application_not_available, Toast.LENGTH_SHORT).show();
                return;
            } else {
                c.startActivity(intent);
            }
		} catch (ActivityNotFoundException e) {
			Toast.makeText(c.getApplicationContext(), R.string.application_not_available, Toast.LENGTH_SHORT).show();
		} catch (SecurityException e){
            Toast.makeText(c.getApplicationContext(), R.string.application_not_available, Toast.LENGTH_SHORT).show();
        }
	}