Overview of how Android gets Layoutinflater objects

When writing an Android program, sometimes a custom view is written, using the Inflater object to parse the layout file into a view. The main purpose of this paper is to summarize the methods of obtaining Layoutinflater objects.

1, if you can get the context object, there are several methods:

Layoutinflater Inflater = (layoutinflater) context.getsystemservice (Context.layout_inflater_service); View child = inflater.inflate (R.layout.child, NULL);

Or

Layoutinflater Inflater = layoutinflater.from (context); View child = inflater.inflate (R.layout.child, NULL);

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2, in an activity, you can have the following methods:

View child = Getlayoutinflater (). Inflate (R.layout.child, item, FALSE);

Or

View view; Layoutinflater Inflater = (layoutinflater)   getcontext (). Getsystemservice (Context.layout_inflater_service); View = Inflater.inflate (r.layout.mylayout, NULL);

Both Method 1 and Method 2 are actually used for the context (). Getsystemservice ().

3. Static method of using view:

View view=view.inflate (context, r.layout.child, NULL)

Inflate realize the source code as follows:

    /**     * Inflate a view from an XML resource.  This convenience method wraps the {@link     * Layoutinflater} class, which provides a full range of options for view INFL ation.     *     * @param context the context object for your activity or application.     * @param resource The resource ID to inflate     * @param root A View group that would be the parent.  Used to properly inflate the     * layout_* parameters.     * @see layoutinflater     *    /public static View inflate (context context, int resource, ViewGroup root) {        layou Tinflater factory = Layoutinflater.from (context);        Return Factory.inflate (resource, root);    }

Layoutinflater.from (context) is actually the packaging of Method 1, can refer to the following source code:

    /**     * Obtains the layoutinflater from the given context.     */public    static Layoutinflater from (context context) {        Layoutinflater layoutinflater =                (layoutinflater) Context.getsystemservice (context.layout_inflater_service);        if (Layoutinflater = = null) {            throw new Assertionerror ("Layoutinflater not Found.")        ;        return layoutinflater;    }