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1. CREATE A HEADER IN TESTVIEW FULL
2. CREATE A HEADER IN TESTVIEW ANDROID
3. CREATE A HEADER IN TESTVIEW CODE

Grid = (GridView)findViewById(R.id.calendar_grid) TxtDate = (TextView)findViewById(R.id.calendar_date_display) Header = (LinearLayout)findViewById(R.id.calendar_header) ītnPrev = (ImageView)findViewById(R.id.calendar_prev_button) ītnNext = (ImageView)findViewById(R.id.calendar_next_button) layout is inflated, assign local variables to components

Inflater.inflate(R.ntrol_calendar, this) LayoutInflater inflater = (LayoutInflater)Ĭontext.getSystemService(Context.LAYOUT_INFLATER_SERVICE) Private void initControl(Context context) The implementation of the component resides in CalendarView.java: public class CalendarView extends LinearLayout Note that only the important parts are shown from the code. Our UI component will be a LinearLayout, to match the root of the XML layout file.

CREATE A HEADER IN TESTVIEW CODE

But encapsulating it as a standalone UI component will prevent code repetition and allow for a modular design, where each module handles one responsibility. The previous layout can be included as-is in an Activity or a Fragment and it will work fine. Note that some repetitive markup has been abbreviated with. This layout is defined in the file control_calendar.xml, as follows. To keep thing simple, let’s display days in a grid, and, at the top, the name of the month along with “next month” and “previous month” buttons. The Component Layoutįirst, let’s start with how the component looks. To follow along, you can find the source code here. However, practicality will usually rule out the third option (2D graphics) and leave us with the two other methods, and we will employ a mixture of both in this article. So, how does one go about creating one’s own calendar view? Any of the approaches above would work. In short, the component looks like this, and almost nothing can be changed:ĬalendarView in AppCompact.Light theme. There is also no way of adding any custom text or graphics, to mark a special occasion, for example. Some might say it looks good as well, but only if you are going for a native look, and have no interest in customizing how it looks whatsoever.įor instance, the CalendarView component provides no way of changing how a certain day is marked, or what background color to use.

CREATE A HEADER IN TESTVIEW FULL

It performs well and provides the minimum functionality expected from any calendar component, displaying a full month and highlighting the current day.

Components created this way usually depend heavily on Android’s 2D drawing API.Īndroid Customization Case Study: The CalendarViewĪndroid provides a native CalendarView component. In this case, the component would inherit the generic View class and override functions like onMeasure() to determine its layout, onDraw() to display its contents, etc. The most versatile and most complex approach is to create a self drawn component. This approach could also make use of the previous one, i.e., the internal components could be native or custom. For example, a LabeledEditText that inherits LinearLayout with horizontal orientation, and contains both a TextView acting as a label and an EditText acting as a text entry field. This approach usually takes advantage of Layouts to control how the components are arranged on the screen. For example, a CircleImageView that inherits ImageView, overriding the onDraw() function to restrict the displayed image to a circle, and adding a loadFromFile() function to load an image from external memory.Ĭreate a compound component out of several components. TextView, ImageView, etc.), and add/override needed functionality.

CREATE A HEADER IN TESTVIEW ANDROID

The Android UI model is inherently customizable, offering the means of Android customization, testing, and the ability to create custom UI components in various ways: The answer to both scenarios is a custom UI component. Import is not uncommon for developers to find themselves in need of a UI component that is either not provided by the platform they are targeting or is, indeed, provided, but lacks a certain property or behavior. This Kotlin file is the launcher for this Android application. Our default MainActivity.kt should look like the following, and we are not changing anything in this file, for now. Following is the content of strings.xml resource file. We have used the string resource hello, in our above layout activity_main.xml file. In this example, we have defined a TextView inside the root element LinearLayout. In the layout activity_main.xml file, define a TextView widget. Ĭreate an Android Project with Kotlin support and follow these steps. To create a TextView in layout file, use TextView widget.