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How To Get File In Assets From Android NDK
(2 answers)
Opening a File from assets folder in android
(6 answers)
Closed 8 years ago.
I wrote a small test application that uses SDL2 on Android via the NDK. It compiles and runs. However, as soon as I try to open files I get FileNotFound Exceptions. I added an assets Directory in my eclipse workdir and put files inside it. When I Export the projekt to an .apk, I can open the file in 7z and see that there is an assets Directory with those files in it. However, when the code gets executed and I try to open assets/somefile.txt, I get a FileNotFound Exception.
Google so far told me that I could put an sdcard in my device with those files on it and access it through /sdcard/ . I'ld like to include those files in my apk though.
How do I Access the files I put in assets ? Or where should I put those files and how should I adjust my path it can Access them at runtime?
Place this code before anything else in your main activity ->
if (Environment.getExternalStorageState (). equals (Environment.MEDIA_MOUNTED)) {
File directory = new File (Environment.getExternalStorageDirectory () + + File.separator "YourFolderName");
directory.mkdirs ();
}
Give this permission in the Manifest xml ->
<uses-permission android: name = "android.permission.WRITE_EXTERNAL_STORAGE" />
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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
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
When I fresh install app, I notice most of the app will have a folder created in Internal Storage > Android > Data > com.example.package folder. For example its facebook app it will be something like com.facebook.xxxxx.
However, one of the project I involve recently, I notice there is no such app folder in the path Internal storage > Android > Data > (No packege folder).
In what scenario it won't create an app folder in the above path ? Because most of the app I debug run via android studio or install via apk file...Always have one app folder in the above location by default.
Because I want to write below file into getFilesDir(),
File file = new File(activity.getFilesDir(),imageFileName);
By using getFilesDir(), written file will go into Android > Data > Package folder > Files folder, most of the installed app have a package folder path in Android > Data > (Here). Today I realise one of the project I am doing now, it doesn't create such package folder. So, when I use getFilesDir() , those files will still be stored and created inside the mentioned path but it is invisible? Or Those files I create using getFilesDir() won't be created? Because as I mentioned this app doesn't create a package folder. Do I have to use makedir ? If yes what will be the checking ? if(！activity.getFilesDir(). exist())
File file = new File(activity.getFilesDir(),imageFileName);
//getFilesDir() normally is package folder Android > Data > (package folder*) > Files
I have tested and find out that if phone is having internal storage only (Not support SDCard) or maybe phone support external storage but don't have SDCard insert. App folder in this path by default won't be created (Android > Data > [App folder]), until I called (getExternalFilesDir(null) , "Example1") check its exists() and makedirs() if it doesn't exist, finally the app folder is created with a folder Example1 in this path Android > App > com.xxxxx.myapp > files > Example1.
However, why some sample app I create I never call getExternalFilesDir(null) or any File writing storage path but by default I can find my sample app path in Android > App > [Here].
Some app folder won't be created by default but until getExternalFilesDir(null) check exist and mkdirs then it become exist and created. Some app folder will be created when app is installed by default. How Android determine if the Android > App > App folder should be created and visible or created and make it invisible??
It makes me confuse. Some app will create app folder, some app wont create it by default when app is installed. Let's assume both app never call any File path create method. Just a very sample app I run using latest Android Studio to test something, it created package folder. The big project app is using old gradle settings and almost 5 years ago, the app by default won't create package folder until I call File(getExternalFilesDir(null), Example1) check if it exists and it doesn't then mkDirs(), package folder become created and visible.
How SY MY told you need to check if phone is having internal storage only (Not support SDCard) or maybe phone support external storage but don't have SDCard insert. App folder in this path by default won't be created. And how he checked you shoud make if statement. So... you can paste this code in your project:
File file = new File(getExternalFilesDir(null),fileName);
if (!file.exists()&&file.mkdirs()){
File file1 = new File(getFilesDir(), fileName);
}
fileName it is a String varable with txt foramt:
private String fileName = "list.txt";
I need to work with a file,that should be at data\data\app_name\files\ . That is now an SQL Database, so solution with SQLiteOpenHelper isn't ok for me. Also, I copyied that file to app_name\app\assets in my profect folder - that didn't work.
How to add that file to installation .apk, to put it in data\data\app_name\files during the installation?
Save your file in \res\raw within your project.
Then, you can access that file using:
InputStream databaseInputStream = getResources().openRawResource(R.raw.yourfile);
Make sure that the resource files are included correctly when generating the apk.
I'm trying to create a partition called "subdata" under "/data". But it's failing.
The steps I tried and the failure results are mentioned below.
File dir =new File(/data/subdata/");
boolean success = dir.mkdir();
Here, the "success" value is found "false".
File dir= context.getDir("/data/subdata",Context.MODE_WORLD_READABLE);
Here, I get "java.lang.IllegalArgumentException: File app_/data/subdata/ contains a path separator"
Please, help me in creating this subfolder under /data/ partition.
I solved my need in the below manner.
As I mentioned in the question that, if I create the sub folder manually, I'm able to read and write to that subfolder in the /data.
So, I created this subfolder through init.rc (as I mentioned, I have the build code also). As I'm more fluent in Linux than in Android, I fixed it through init.rc. Now I'm able to read/write to that folder through my android code.