CODEWITHSUNDEEP
javaandroidandroid-studiofilenotfoundexceptionfile-not-found
user10684554
user10684554

Reputation:

java.io.FileNotFoundException when I'm trying to read into a binary file in my Android Studio project

As the titles says, i want to read into a binary file, "mac_address_name", that is already created. The project is runned on a physical device connected to the android studio IDE.

Here's my project tree, you can see the classes and the binary file :

PROJECT TREE.PNG

Here's the code in the ProcessorManager class, you can see in comments every other ways i tried to do it...

private String readFromFile() {

    String ret = "";

    try {

        /*InputStream inputStream = main_activity.getApplicationContext().openFileInput("mac_address_name");*/
        /*InputStream inputStream = new FileInputStream(new File("../mac_address_name"));*/
        /*InputStream inputStream = main_activity.openFileInput("mac_address_name");*/
        InputStream inputStream = new FileInputStream(new File("mac_address_name"));
        if ( inputStream != null ) {
            InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
            BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
            String receiveString = "";
            StringBuilder stringBuilder = new StringBuilder();

            while ( (receiveString = bufferedReader.readLine()) != null ) {
                stringBuilder.append("\n").append(receiveString);
            }

            inputStream.close();
            ret = stringBuilder.toString();
        }
    }
    catch (FileNotFoundException e) {
        Log.e("login activity", "File not found: " + e.toString());
    } catch (IOException e) {
        Log.e("login activity", "Can not read file: " + e.toString());
    }

    return ret;
}

And the output :

E/login activity: File not found: java.io.FileNotFoundException: mac_address_name: open failed: ENOENT (No such file or directory)

Upvotes: 1

Views: 391

Answers (1)

Ivan Shafran
Ivan Shafran

Reputation: 641

For this purpose, you should use assets. Move the file to the src/main/assets folder inside your project. Then use AssetsManager to get file content:

AssetManager am = context.getAssets();
InputStream is = am.open("mac_address_name");

More info at: https://nbasercode.com/net/android-read-text-file-from-assets-folder-in-android-studio/ https://developer.android.com/reference/android/content/res/AssetManager

Upvotes: 1

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