/**
     * 讀取assets下的txt檔案，返回utf-8 String
     * @param context
     * @param fileName 不包括字尾
     * @return
     */
    public static String readAssetsTxt(Context context,String fileName){
        try {
            //Return an AssetManager instance for your application's package
            InputStream is = context.getAssets().open(fileName+".txt"
 
);
            int size = is.available();
            // Read the entire asset into a local byte buffer.
            byte[] buffer = new byte[size];
            is.read(buffer);
            is.close();
            // Convert the buffer into a string.
            String text = new String(buffer, "utf-8");
            // Finally stick the string into the text view.
 

           return text;
        } catch (IOException e) {
            // Should never happen!
//            throw new RuntimeException(e);
            e.printStackTrace();
        }
        return "讀取錯誤，請檢查檔名";
    }

直接上程式碼簡單粗暴