Develop Reference

How to load SVF to Autodeks Forge viewer Offline in Android?

I am trying to load SVF file on Autodesk forge viewer locally in Xamarin.Android. I copied the content to my project Assets/html folder. My code to load the content looks like this.
In MyWebViewClient.cs
public WebResourceResponse ShouldInterceptRequest(WebView webView, IWebResourceRequest request)
{
try
{
Android.Net.Uri url = request.Url;
//Uri uri = url;
String path = url.Path;
if (path.StartsWith("/android_asset/"))
{
try
{
AssetManager assetManager = this.context.Assets;
String relPath = path.Replace("/android_asset/", "").Replace("gz", "gz.mp3");
//InputStream stream = assetManager.Open(relPath);
return new WebResourceResponse(null, null, assetManager.Open(relPath));
}
catch (IOException ex)
{
String str = ex.Message;
}
}
}
catch (Exception ex) { }
return null;
}
Then in my Activity.cs
SetContentView(Resource.Layout.webview);
var wbMain = FindViewById<WebView>(Resource.Id.webView1);
wbMain.Settings.DomStorageEnabled = true;
wbMain.Settings.JavaScriptEnabled = true;
wbMain.Settings.AllowFileAccessFromFileURLs = true;
wbMain.Settings.AllowUniversalAccessFromFileURLs = true;
var customWebViewClient = new MyWebViewClient(BaseContext);
customWebViewClient.OnPageLoaded += MyWebViewClient_OnPageLoaded;
wbMain.SetWebViewClient(customWebViewClient);
wbMain.LoadUrl("file:///android_asset/html/index.html");
This only loads the side views not the main viewer.
Whats the reason for this and how can I resolve this?

Please note that the sample is a bit outdated and there have been some changes in our legal terms since then. Currently, the legal T&C state that all viewer assets (JS, CSS, icons, images, etc.) must be coming from the Autodesk domain.
If you need to be able to run your viewer-based app in "temporarily offline" scenarios (for example, on a construction site), I'd suggest that you look at the following blog post: https://forge.autodesk.com/blog/disconnected-workflows. This approach (using Service Workers and Cache API) is consistent with the legal requirements.

complete event trigger before full download

In my app, I need to download few files form server. I used the following code:
function downloadFile(index:int):void
{
var urlLoader:URLLoader = new URLLoader();
urlLoader.dataFormat = URLLoaderDataFormat.BINARY;
urlLoader.addEventListener(Event.COMPLETE, onLoadFileComplete);
urlLoader.addEventListener(ProgressEvent.PROGRESS, onLoadFileProgress);
urlLoader.addEventListener(IOErrorEvent.IO_ERROR, onURLIOError);
urlLoader.load(new URLRequest("some url"));
fileNameToSave = "some name";
trace("file name:" + fileNameToSave);
downloading = true;
}
function onLoadFileProgress(e:ProgressEvent):void
{
var loadedPct:uint = Math.round(100 * (e.bytesLoaded / e.bytesTotal));
}
function onURLIOError(e:IOErrorEvent):void
{
trace("error msg");
e.target.removeEventListener(IOErrorEvent.IO_ERROR, onURLIOError);
}
function onLoadFileComplete(e:Event):void
{
trace("File downloaded");
var file:File;
file = File.documentsDirectory.resolvePath("somelocation/" + fileNameToSave);
if(file != null)
{
var fileStream:FileStream = new FileStream();
fileStream.openAsync(file, FileMode.WRITE);
fileStream.addEventListener(OutputProgressEvent.OUTPUT_PROGRESS, outputProgressHandler);
fileStream.addEventListener(Event.CLOSE, onSaveFile);
fileStream.writeBytes(e.target.data);
fileStream.close();
}
e.currentTarget.removeEventListener(Event.COMPLETE, onLoadFileComplete);
e.currentTarget.removeEventListener(ProgressEvent.PROGRESS, onLoadFileProgress);
e.currentTarget.removeEventListener(IOErrorEvent.IO_ERROR, onURLIOError);
}
function outputProgressHandler(e:OutputProgressEvent):void
{
if (e.bytesPending == 0)
{
trace("File is completely written");
}
}
function onSaveFile(e:Event):void
{
trace("Saved Complete");
loadfiles();
e.currentTarget.removeEventListener(Event.CLOSE, onSaveFile);
}
It works fine. But the problem I'm having is when the internet is slow, sometime it triggers complete event even if the file is not fully downloaded. Is there anyway to prevent this? Any help would be appreciated.
UPDATE: Is it a good practice to use progress event to check if the download is complete rather than using complete event. Like:
if(e.bytesLoaded >= e.bytesTotal)
{
//downloadComplete
}
else
{
//not complete
}

I can not comment because I have insufficient reputation.
I have previously had similar issue where filestream write reports as complete when in fact it has not. This occurs only on older devices and occurs randomly. My testing seemed to confirm that Flash reports file saved before the OS had actually completed. When a read then occurred it would report as file not found.
I solved it rather crudely using setTimeout and repeatedly checked if the data was complete.

WebView and Assets problems

My current monodroid project is having two problems - one in loading from Assets and the other is a generated webpage being passed to be displayed and their inter-related which makes things more annoying!
The assets problem is simple enough, the file can't be found. My current code looks like this
Android.App.Application.SynchronizationContext.Post(delegate
{
string uri = "file:///android_asset/StyleSheet.css";
string settings = string.Empty;
using (var input = c.Assets.Open(uri))
using (StreamReader sr = new System.IO.StreamReader(input))
{
settings = sr.ReadToEnd();
}
string CSS = "<html><head><style>" + settings + "</style></head><body style='height:600px;background: url(Back-AQHA.jpg)' >";
retStr = CSS + tableData.Content + "</body></html>";
callback(retStr);
}, null);
This dies at the sr.ReadToEnd() line as the file can't be found. All the permissions are correctly set for me to be able to access the assets directory and read in.
c is just a Context passed to the method
Now, assuming that the file had be read in and passed back to the caller, it now fails to be displayed (tested this by generating a page within the app and passing it back)... The webviewer code is bog standard
public class webservice_webview : Activity
{
WebView web_view;
protected override void OnCreate(Bundle bundle)
{
base.OnCreate(bundle);
SetContentView(Resource.Layout.webview);
string res = base.Intent.GetStringExtra("content");
if (res.Length > 0)
{
web_view = FindViewById<WebView>(Resource.Id.webviewer);
web_view.Settings.JavaScriptEnabled = true;
web_view.LoadData(res, "text/html", null);
web_view.SetWebViewClient(new websiteviewClient());
}
else
return;
}
private class websiteviewClient : WebViewClient
{
public override bool ShouldOverrideUrlLoading(WebView view, string url)
{
view.LoadData(url, "text/html", null);
return true;
}
}
public override bool OnKeyDown(Android.Views.Keycode keyCode, Android.Views.KeyEvent e)
{
if (keyCode == Keycode.Back && web_view.CanGoBack())
{
web_view.GoBack();
return true;
}
return base.OnKeyDown(keyCode, e);
}
}
}
When the content is passed over and rendered, all that results is a dead webpage saying that the url data;text/html;null,[generated html] may have moved or has gone. How do I get the generated page to display?
Thanks
Paul

It might be worth check your assets are in the assets folder and are marked in the properties pane as being "AndroidAsset" - also please make sure capitalisation is correct.
Assuming they are then you can just pass the assets direct to the webview using code like:
var web = FindViewById<WebView>(Resource.Id.AboutWebView);
web.LoadUrl("file:///android_asset/About/index.html");
from https://github.com/slodge/mobile-samples/blob/master/MWC/MWC.Droid/Views/About/AboutXamarinView.cs
If you do want to read in and manipulate the html text first, then try code like: Assets.Open("About/index.html") - i.e. without the file: scheme attached.
In your second sample, the code for web_view.LoadData(res, "text/html", null); looks correct - but then I'm not sure what your logic inside ShouldOverrideUrlLoading does - that looks like it might just prevent things from loading?

How can I clear the Android app cache?

I am writing a app which can programatically clear application cache of all the third party apps installed on the device. Following is the code snippet for Android 2.2
public static void trimCache(Context myAppctx) {
Context context = myAppctx.createPackageContext("com.thirdparty.game",
Context.CONTEXT_INCLUDE_CO|Context.CONTEXT_IGNORE_SECURITY);
File cachDir = context.getCacheDir();
Log.v("Trim", "dir " + cachDir.getPath());
if (cachDir!= null && cachDir.isDirectory()) {
Log.v("Trim", "can read " + cachDir.canRead());
String[] fileNames = cachDir.list();
//Iterate for the fileName and delete
}
}
My manifest has following permissions:
android.permission.CLEAR_APP_CACHE
android.permission.DELETE_CACHE_FILES
Now the problem is that the name of the cache directory is printed but the list of files cachDir.list() always returns null. I am not able to delete the cache directory since the file list is always null.
Is there any other way to clear the application cache?

"android.permission.CLEAR_APP_CACHE" android.permission.DELETE_CACHE_FILES"
Ordinary SDK applications cannot hold the DELETE_CACHE_FILES permission. While you can hold CLEAR_APP_CACHE, there is nothing in the Android SDK that allows you to clear an app's cache.
Is there any other way to clear the application cache?
You are welcome to clear your own cache by deleting the files in that cache.

Check out android.content.pm.PackageManager.clearApplicationUserData: http://grepcode.com/file/repository.grepcode.com/java/ext/com.google.android/android/2.3.3_r1/android/content/pm/PackageManager.java/
The other hidden methods in that class might be useful, too.
In case you've never used hidden methods before, you can access hidden methods using Java reflection.

poate iti merge asta
static int clearCacheFolder(final File dir, final int numDays) {
int deletedFiles = 0;
if (dir!= null && dir.isDirectory()) {
try {
for (File child:dir.listFiles()) {
//first delete subdirectories recursively
if (child.isDirectory()) {
deletedFiles += clearCacheFolder(child, numDays);
}
//then delete the files and subdirectories in this dir
//only empty directories can be deleted, so subdirs have been done first
if (child.lastModified() < new Date().getTime() - numDays * DateUtils.DAY_IN_MILLIS) {
if (child.delete()) {
deletedFiles++;
}
}
}
}
catch(Exception e) {
Log.e("ATTENTION!", String.format("Failed to clean the cache, error %s", e.getMessage()));
}
}
return deletedFiles;
}
public static void clearCache(final Context context, final int numDays) {
Log.i("ADVL", String.format("Starting cache prune, deleting files older than %d days", numDays));
int numDeletedFiles = clearCacheFolder(context.getCacheDir(), numDays);
Log.i("ADVL", String.format("Cache pruning completed, %d files deleted", numDeletedFiles));
}

I'm not sure how appropriate this is in terms of convention, but this works so far for me in my Global Application class:
File[] files = cacheDir.listFiles();
for (File file : files){
file.delete();
}
Of course, this doesn't address nested directories, which might be done with a recursive function like this (not tested extensively with subdirectories):
deleteFiles(cacheDir);
private void deleteFiles(File dir){
if (dir != null){
if (dir.listFiles() != null && dir.listFiles().length > 0){
// RECURSIVELY DELETE FILES IN DIRECTORY
for (File file : dir.listFiles()){
deleteFiles(file);
}
} else {
// JUST DELETE FILE
dir.delete();
}
}
}
I didn't use File.isDirectory because it was unreliable in my testing.

Disable webpage cache programmatically

I have an app that loads an URL. My problem is that it shows me the old version of that webpage and never loads the new one(I think it keeps the webpage in cache and loads it from there even though I have wireless connection). Is there a way to programmatically specify my app to never keep the webpages in memory? Or maybe I have a different problem that need another approach.

try something like this(not tested) for deleting the cache at the end of session:
private int clearCacheFolder(){
deletedFiles = 0;
File dir = context.getCacheDir();
if (dir!= null && dir.isDirectory()) {
try {
for (File child:dir.listFiles()) {
//delete subderictories
if (child.delete()) {
deletedFiles++;
}
}
}
}
catch(Exception e) {
}
}
return deletedFiles;
}
or
setAppCacheEnabled(false);
for disabling it

//cache is per-application, so this will clear the cache for all WebViews used.
clearCache(boolean includeDiskFiles)
// prob not what you want
clearFormData()
// prob not what you want
clearHistory()