Android Studio无法在资产文件夹中找到文件

Question

New to Android Studio and am stumbling on fairly simple things. I'm trying to open a file that I have stored in the assets folder of my project. I get a FileNotFoundException error. How should I correctly store and reference the file?

Here is the method that crashes:

    public void saveKey(String outFile, String pubKeyFilename) throws IOException, GeneralSecurityException {

        File out = new File(outFile);
        File publicKeyFile = new File(pubKeyFilename);

        // read public key to be used to encrypt the AES key
        byte[] encodedKey = new byte[(int)publicKeyFile.length()];

        // crashes here
        new FileInputStream(publicKeyFile).read(encodedKey);

        //...
}

And here is how I am calling it:

EncryptRSA cipher = new EncryptRSA();
cipher.saveKey("temp", "public.der");

The file is saved in my assets folder like this:

Answer 1

I'm trying to open a file that I have stored in the assets folder of my project.

To access file from assets folder use AssetManager for getting InputStream using file name:

AssetManager assManager = getApplicationContext().getAssets();
InputStream inputStream = assManager.open(pubKeyFilename);
BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
String line = reader.readLine();