I would like to set the CCT toolbar and secondary toolbar colors. This chore should feel familiar if you have ever built a custom component for Android. Proper support for that feature starts by creating an attrs.xml file under the values resource folder. In this example, I would like to pass two styling attributes from my navigation's XML file to the destination. Since CCT is an activity, I supplied Activity::class as the destination type. Thus, in this case, I will use the destination type as - Provides the component with some insight regarding what kind of destination you are implementing. Here is what they - Defines the name of the tag which we will use in the navigation graph’s XML file. You probably noticed two decorators in the above code sample. ![]() I, however, know that it will be necessary for this example, so I added it up front. Altogether, the basic implementation looks like this:ĭepending on your needs, you may not need a context as a constructor argument. Now, the generic argument for the Navigator can receive the nested class. In practice, engineers typically create a nested class inside of the first class, call it Destination, subclass it from NavDestination, and supply the stubbed navigator as a constructor parameter. We will, of course, have to supply a type to the generic argument for the Navigator. Thus, let’s create a new class called ChromeCustomTabsNavigator, let it inherit from Navigator, and stub all of the abstract methods. Technically speaking, all destination types are a subtype of the Navigator class. Head over the Android documentation to learn how to set up the Navigation Component with Safe Args. Of course, before writing extensions for the navigation graph, you’ll need to have it included as part of your project and use Android Studio 3.3 or newer. Also maps the custom attributes from the XML file to the code which implements and uses those properties.Ĭustom Navigator Host - Adds support for the custom destination to the navigation controller. ![]() Values/attrs.xml - Holds the XML definition of the destination type for Android Studio code completion and to support custom attributes.Ĭustom Navigator Class - Defines how to navigate into (push) and out of (pop) the custom destination. To declare a custom destination type for the Jetpack Navigation Component, an engineer needs to create three files: This fact dramatically reduces the effort on our part to add in this capability. Why? As will be the answer for most things in this article, it is because the browser handles this functionality entirely on its own, like a black box. Therefore, when adding in CCT as a destination type, an engineer must keep in mind that the graph has no control over the browser and should not consider adding it to the component’s built-in back stack. In general, however, the navigation component was designed to handle switching out multiple fragments on a single activity. ![]() Once the user finishes, he or she is dropped back onto the previous fragment or activity, just as expected. It is an activity which manages all of the back and forward functionality a user would expect in a normal browser without an engineer having to hijack the system’s back button or listen for an event when closing the browser with the X icon. Getting Our Thinking StraightĬCT can almost feel like magic. Fortunately, since CCT is similar enough in behavior to activities, it is not a significant lift to add in support for this destination type. Support for Chrome Custom Tabs (CCT) is a notable omission from this list. As of November 2021, the current state of this library offers native support for these destination types: Since the preliminary release of the navigation component in May 2018, much of its functionality has improved, changed, and expanded. Current State of the Navigation Component Google has heard our pleas for help and given us the Navigation Component. Before Jetpack’s debut, fragment and activity-based navigation often proved to be complicated, fragile, and nearly unique to each app on the market. With the introduction of Android Jetpack, developers now have a marvelous new set of libraries which offer an unprecedented level of simplicity and reusability.
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