SASS - Important Notes
Sass files beginning with an underscore are called partials and won't be compiled to CSS, but they can be imported into other sass stylesheets.
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About Android padding, margin, width, height, wrap_content, match_parent, R Class
Padding and Margin padding and layout_margin are two very similar attributes. Both determine the space around a View. The difference is that padding determines space within the boundaries of the view, and layout_margin determines the space outside the boundaries of the view. Width and Height Some of the most important properties are the width property and height property - those must be defined for every view. Remember that all views occupy a rectangular area on the screen - the width and height are the width and height of that area. You can define this in pixels, or better yet dp (stands for density-independent pixels): android:layout_width="200dp" android:layout_height="300dp" For the sake of having a layout be responsive and adjust to different devices, two common values are not numbers at all, but wrap_content and match_parent used as shown here: android:layout_width="wrap_content" android:layout_height="match_parent"
@SerializedName and @Expose annotations
The @SerializedName annotation is needed for Gson to map the JSON keys with our fields. In keeping with Java's camelCase naming convention for class member properties, it is not recommended to use underscores to separate words in a variable. @SerializedName helps translate between the two. @SerializedName ( "quota_remaining" ) @Expose private Integer quotaRemaining; In the example above, we are telling Gson that our JSON key quota_remaining should be mapped to the Java field quotaRemaining . If both of these values were the same, i.e. if our JSON key was quotaRemaining just like the Java field, then there would be no need for the @SerializedName annotation on the field because Gson would map them automatically. The @Expose annotation indicates that this member should be exposed for JSON serialization or deserialization.