If you wish to use a separate OkHttp dependency, you should exclude the OkHttp dependency from Retrofit 2 as:Ĭompile ('2:retrofit:2.1. Sometimes using only points can be difficult to create a datum because it is tough for a fixture to touch a specific point. OkHttp dependency is already shipped with Retrofit 2 dependency. In this example you noticed that datum target A1,A2 and A3 is used to to create datum A. We need to add the following dependencies in our ade file.Ĭompile '2:retrofit:2.1.0'Ĭompile ':gson:2.6.2'Ĭompile '2:converter-gson:2.1.0' To serialise JSON we need a converter to convert it into Gson first. Retrofit automatically serialises the JSON response using a POJO(Plain Old Java Object) which must be defined in advanced for the JSON Structure. For example, NAD27, NAD83, and WGS84 are the most common geodetic datums in North America. Surveyors now rely almost exclusively on the Global Positioning System (GPS) to identify locations on the Earth and incorporate them into existing geodetic datums. The difference is significant - in the south of New Zealand the ellipsoid is about 5m above sea level, whereas in the north it is about 40m below sea level. This means that heights are defined above a mathematically defined ellipsoid rather than above sea level. Retrofit 2 by default leverages OkHttp as the networking layer and is built on top of it. NAD 27 and NAD 83 provide a frame of reference for latitude and longitude locations on Earth. NZGD2000, like the global reference frames, is a geometric datum. This enables the optimal surface to be used as a datum. A datum system comprising three datum planes that are perpendicular to each other is called a three-plane datum system. We’ll not go into the details of Retrofit 1.x versions and jump onto Retrofit 2 directly which has a lot of new features and a changed internal API compared to the previous versions. For example, three datums are used to completely capture the orientation of a part.
#Datum example for android
Retrofit is type-safe REST client for Android and Java which aims to make it easier to consume RESTful web services. Today we’ll use the Retrofit library developed by Square to handle REST API calls in our android application. In the below example, the primary datum targets “A1”, “A2” and “A3” are circular surfaces of diameter 2, the secondary datum targets “B1” and “ B2” are the surfaces of diameter 4 and the tertiary datum targets “C1” is of diameter 5.Welcome to Retrofit Android Example Tutorial. The problem is that the way the parts have been defined on their drawings does not mimic the way they really function/work in the assembly. This will immediately give different value for MIN gap X. As per the 3-2-1 principle, we typically define three primary datum targets, two secondary datum targets, and one tertiary datum targets. For example, just imagine that the mating face in the housing is out-of-square relative to the axis of the thru hole. The sole purpose of the datum target is for locating or constraining the part to a fixture. But, for specifying the datum targets we use some portions of the datum features.
Datum Targetĭatum targets also are generated from the datum features. The above drawing has two datum features and hence two datum: an imaginary plane at the left hand surface of the part and the axis of the hole. The NAD 27 is an example of horizontal geodetic datums the NGVD 29 and NAVD 88 are the most two common nationwide vertical datum systems. If you have axis and plane, then one axis and one plane will suffice for the need. In the case of planes, you need three mutually perpendicular ones. If you have a point datum, then only one datum is sufficient to constrain the model. Datums are established from the datum features. In this example note the tangible Datum Feature is the surface of the bore. This reference frame is used for dimensioning for the drawing and model creation. A datum is theoretical exact plane, axis or point location that GD&T or. Datumĭatums are theoretically perfect but imaginary planes, axises, and points used for creating reference frame in a drawing. In the above example, the left hand vertical surface and the cylindrical feature of the right are taken as datum features. See the following image for an example of how typically the datum features A and B are used in the drawings: The datum features are used to restrict the transitional and rotational movement of the part when it placed in fixtures. Datum features are represented by capital letters enclosed by a square. Datum Featureĭatum feature is a feature of a part from which datum is marked. Out of the five we will comparatively discuss three terms: datum, datum feature, and datum target. There are five different terms starting with the word “datum” in ASME Y 14.5 (the Bible of GD&T).
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