Develop Reference

Android studio, pass assets file path to another method

I am making an app which use the following java line:
Net dnnNet = Dnn.readNetFromONNX("path\to\file");
As you can see, readNetFromONNX requires path to onnx file.
So I put my onnx file under assest folder, so I can use it at run time.
The problem is I you can only read assets foler with AssestManager and inputstream... the readNetFromONNX needs path...
How do I overcome this probelm? Is there a way to get the path of the file at run time? Maybe other folder?
Thanks from advance

Android Studio OpenCV yolo where do I put my files?

I am creating an app in android studio that uses library opencv and yolo. I want to store the yolo config file and weights inside the android package. Right now I have those file in the external storage of my phone and I access them like this:
String yoloCfg = Environment.getExternalStorageDirectory() + "/dnns/traffic-yolov3-tiny.cfg" ;
String yoloWeights = Environment.getExternalStorageDirectory() + "/dnns/traffic-yolov3-tiny_15000.weights";
yolo = Dnn.readNetFromDarknet(yoloCfg, yoloWeights);
My question is: where do I put yolo config file and weights for them to be inside the app when the user downloads the apk and how do I get the path to them, since readNetFromDarknet needs as args the path of those files.
I have tried put them in the asset and attempt to get the path to asset but it doesnt work. This is the code I tried:
String yoloCfg = "file:///android_asset/traffic-yolov3-tiny.cfg";
String yoloWeights = "file:///android_asset/traffic-yolov3-tiny_15000.weights";
yolo = Dnn.readNetFromDarknet(yoloCfg, yoloWeights);
This is where I have the files:
Location of files
And this is the error I get:
E/cv::error(): OpenCV(4.0.1) Error: Parsing error (Failed to parse NetParameter file: file:///android_asset/traffic-yolov3-tiny.cfg) in readNetFromDarknet, file /build/master_pack-android/opencv/modules/dnn/src/darknet/darknet_importer.cpp, line 207
E/org.opencv.dnn: dnn::readNetFromDarknet_10() caught cv::Exception: OpenCV(4.0.1) /build/master_pack-android/opencv/modules/dnn/src/darknet/darknet_importer.cpp:207: error: (-212:Parsing error) Failed to parse NetParameter file: file:///android_asset/traffic-yolov3-tiny.cfg in function 'readNetFromDarknet'
E/SurfaceView: Exception configuring surface

I had the exact same issue. What I did to fix this was to add the files in the asset folder; then I created two files and copied the content of the asset folder files there.
Make sure to use the following path and create your files there:
applicationContext.filesDir.absolutePath

Download web content and load on Android webview at runtime

I want to load a local web content on a webview. I'm downloading a zip file, unzipping it and saving the files (main.html and resource files - css, js, fonts, pngs, etc) on internal storage (/data/data/<app>/files/).
All files are in the same directory:
|- main.html
|- file.js
|- ...
So, the html file points resource files as follows:
<script type="text/javascript" src="file.js"></script>
I though this would work
String path = context.getFilesDir() + File.separator + "main.html";
webview.loadUrl("file://" + path)
but the webview shows file not found error in pre lollipop devices, and in lollipop devices shows:
"The webpage at file:///data/data/<app>/files/main.html could not be loaded because: net::ERR_ACCESS_DENIED"
If I load the html as a string by running
String file = htmlFile.fileToString();
webview.loadDataWithBaseURL("", file, "text/html", "utf-8", "");
it works, but I have to resolve the dependencies by providing the full path of all resource files. There must be a better way to deal with this.
Does anyone know how to load a local file on a webview that was stored at runtime in Android?
Thanks

I forgot the config methods of the webview.
webview.getSettings().setAllowFileAccess(false)
This was the problem. By turning to true the webview is able to load local files.

Open pdf in Android Mobile using IBM Worklight studio

I need to open a pdf in android mobile device.
For that ,I have add a 'test.pdf' pdf file in common folder and add plugin (Childbrowser ) in config.xml file (res/xml/config.xml). And again add childbrowser.js and cordova.js file in js folder .
And add a code to open a pdf file here---
window.open('./test.pdf','_system','location=yes');
But still exception is coming like that 'Target file is not available' andgive a path
file.///data/data/
I want to load that test.pdf file in the android mobile and open that particular file .
But it is not opening .
Please suggest me a solution. Thanks

Unfortunately, Android does not support viewing PDFs out of the box in a WebView. Most results point to using Google Docs.
Here are some suggestions:
Open PDF in a WebView
How to open local pdf file in webview in android?
http://developer.appcelerator.com/question/147570/open-remote-pdf-file-on-webview-in-android
This you could do by combining a Cordova plug-in and this native code: http://kylewbanks.com/blog/Loading-PDF-in-Android-WebView
http://asmncl.blogspot.co.il/2012/06/android-open-pdf-file-in-webview.html

Bad path trying to open file in Android

I'm trying to open a file with this:
document = builder.parse(new File("Data.xml"));
and I'm getting this message:
/Data.xml: open failed: ENOENT (No such file or directory)
and the file is in the root directory of the android project.

You are trying to open a file located in / (in linux this is the root directory of your file system). Instead you should be trying to create a file either on the SDCard or within the local storage directory for your application.
See this for more clarification: http://developer.android.com/guide/topics/data/data-storage.html

Move Data.xml into the assets folder of your project. Then to get a file reference, call getResources().getAssets().openFd( "Data.xml" )

You should probably try using a file input stream constructor for the builder instead, and use openFileInput( String fileName ) to get that, which does only use your app's data directory.
Using persistent storage
openFileInput()