从assets读取文件，做调试

import android.content.Context;
import android.content.res.AssetManager;

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

public class aa {

    public static String readFileFromAssets(Context context, String fileName) throws IOException {
        AssetManager assetManager = context.getAssets();
        InputStream inputStream = null;
        StringBuilder stringBuilder = new StringBuilder();
        try {
            inputStream = assetManager.open(fileName);
            BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
            String line;
            while ((line = reader.readLine()) != null) {
                stringBuilder.append(line);
            }
        } finally {
            if (inputStream != null) {
                inputStream.close();
            }
        }
        return stringBuilder.toString();
    }
}