Java how to read file from assets folder in android

To read a file from the assets folder in an Android application, you can use the AssetManager class, which provides access to the application's assets.

Here is an example of how you can use the AssetManager class to read a file from the assets folder in an Android application:

import android.content.Context;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

public class FileReader {
    public static String readFile(Context context, String fileName) throws IOException {
        StringBuilder sb = new StringBuilder();
        BufferedReader reader = null;
        try {
            InputStream is = context.getAssets().open(fileName);
            reader = new BufferedReader(new InputStreamReader(is));
            String line;
            while ((line = reader.readLine()) != null) {
                sb.append(line);
                sb.append("\n");
            }
        } finally {
            if (reader != null) {
                reader.close();
            }
        }
        return sb.toString();
    }
}

In this example, the readFile method takes a Context object and a file name as arguments and returns a string containing the contents of the file.

The method starts by creating a StringBuilder object to hold the contents of the file. It then creates an InputStream object using the getAssets method of the Context object and the open method of the AssetManager class, which opens the file from the assets folder.

The InputStream object is then wrapped in a BufferedReader object, which reads the file line by line using the readLine method. The contents of the file are appended to the StringBuilder object, and a newline character is added after each line.

Finally, the BufferedReader object is closed and the contents of the StringBuilder object are returned as a string.

This code will read the file from the assets folder and return its contents as a string. You can modify the code to perform other operations with the file, such as parsing it or storing it in a data structure.

Keep in mind that this is just one way to read a file from the assets folder in an Android application. You can use different techniques and libraries to achieve the same result, such as using the File class or the InputStreamReader class directly. You may also need to handle exceptions and other error conditions.