With over 40 pages, layouts, and controls built into the Xamarin. Forms library, you are sure to find something to fit your needs when building out native mobile apps on iOS, Android, and Windows Phone.
One of the key features that I love about Xamarin. Forms is that you are able to not only completely customize each built in-controlbut you can extend and mix-and-match platform specific APIs and custom controls.
This means that if you have been building and using custom controls in your Xamarin apps you are still able to re-use them in your Xamarin.
Forms mobile apps with the concept of a custom renderer. Over the past 3 years I have built out a lot of custom controls and one of my favorite has to be this circular progress bar. It has the look and feel of the built in Android stop watch, but I re-wrote it in C as part of my Xamarin. Android Toolkit. Of course I want to re-use this control and others in my Xamarin.
This means that you can give your custom controls new functionality with the built-in data binding system in Xamarin. In my shared code project I am going to create a new control that will be used in my pages and layouts called CircularProgress and this will inherit from Xamarin. The real magic is to implement the two way data binding with custom properties in this class. I can create these with the BindableProperty class which describes what the property is and knows how to trigger a PropertyChanged Notification.
Here I will implement just a few such as if the progress bar is indeterminate, the current progress, and what color the bar is. Notice here that I am using the Color property, which is a Xamarin. Forms specific color, that I am setting to Red as the default.
I would do the same for other properties that I wan to bind to. With my new Xamarin. Forms control in place I can now implement the platform specific renderer in my Xamarin. Android project, which I will call CircularProgressRenderer. Each Xamarin. Forms control has a custom renderer that you can inherit from if you are customizing a built in control. However since this is completely custom View I am going to inherit from ViewRenderer. This type of renderer on Android inherits from View, which means Xamarin.
Forms will handle all of the size calculations and normal properties of a standard Android View. All I have to do now is create my custom control and tell the renderer to display it. I can do this in our OnElementChanged method where I have access to two very important properties. Since ViewRenderer is templated, which you can see when I inherited from it my Element and Control already have the correct type of the Xamarin.
Forms control and native control that I will be using. This means I will not have to do any casting, which is very nice. Here I am creating a new HoloCircularProgressBar from my own personal library of controls and when created I set all of the controls properties to the Xamarin.
To get the control to show up in the actual view all I need to do is set a special ExportRenderer so Xamarin.Android offers a sophisticated and powerful componentized model for building your UI, based on the fundamental layout classes: View and ViewGroup. To start with, the platform includes a variety of prebuilt View and ViewGroup subclasses — called widgets and layouts, respectively — that you can use to construct your UI.
For more examples, see Common Layout Objects. If none of the prebuilt widgets or layouts meets your needs, you can create your own View subclass.
If you only need to make small adjustments to an existing widget or layout, you can simply subclass the widget or layout and override its methods. Creating your own View subclasses gives you precise control over the appearance and function of a screen element.
To give an idea of the control you get with custom views, here are some examples of what you could do with them:. The sections below explain how to create custom Views and use them in your application. For detailed reference information, see the View class.
Here is a high level overview of what you need to know to get started in creating your own View components:. Tip: Extension classes can be defined as inner classes inside the activities that use them. This is useful because it controls access to them but isn't necessary perhaps you want to create a new public View for wider use in your application. Fully customized components can be used to create graphical components that appear however you wish.
Perhaps a graphical VU meter that looks like an old analog gauge, or a sing-a-long text view where a bouncing ball moves along the words so you can sing along with a karaoke machine.
Android - Custom Components
Either way, you want something that the built-in components just won't do, no matter how you combine them. Fortunately, you can easily create components that look and behave in any way you like, limited perhaps only by your imagination, the size of the screen, and the available processing power remember that ultimately your application might have to run on something with significantly less power than your desktop workstation.
The onDraw method delivers you a Canvas upon which you can implement anything you want: 2D graphics, other standard or custom components, styled text, or anything else you can think of.
Note: This does not apply to 3D graphics. If you want to use 3D graphics, you must extend SurfaceView instead of View, and draw from a separate thread. This is made slightly more complex by the requirements of limits from the parent which are passed in to the onMeasure method and by the requirement to call the setMeasuredDimension method with the measured width and height once they have been calculated.
If you fail to call this method from an overridden onMeasure method, the result will be an exception at measurement time. At a high level, implementing onMeasure looks something like this:. If you don't want to create a completely customized component, but instead are looking to put together a reusable component that consists of a group of existing controls, then creating a Compound Component or Compound Control might fit the bill.
In a nutshell, this brings together a number of more atomic controls or views into a logical group of items that can be treated as a single thing. For example, a Combo Box can be thought of as a combination of a single line EditText field and an adjacent button with an attached PopupList. If you press the button and select something from the list, it populates the EditText field, but the user can also type something directly into the EditText if they prefer.Download the sample.
This Android platform-specific enables pinch-to-zoom and a zoom control on a WebView. EnableZoomControls and WebView. DisplayZoomControls bindable properties to boolean values:. The WebView. DisplayZoomControls bindable property controls whether zoom controls are overlaid on the WebView. EnableZoomControls method, in the Xamarin. AndroidSpecific namespace, is used to control whether pinch-to-zoom is enabled on the WebView.
DisplayZoomControls method, in the same namespace, is used to control whether zoom controls are overlaid on the WebView. In addition, the WebView. ZoomControlsEnabled and WebView. ZoomControlsDisplayed methods can be used to return whether pinch-to-zoom and zoom controls are enabled, respectively.
The result is that pinch-to-zoom can be enabled on a WebViewand zoom controls can be overlaid on the WebView :. Zoom controls must be both enabled and displayed, via the respective bindable properties or methods, to be overlaid on a WebView. Submit and view feedback for. Skip to main content. Exit focus mode. PlatformConfiguration; using Xamarin. EnableZoomControls true. The result is that pinch-to-zoom can be enabled on a WebViewand zoom controls can be overlaid on the WebView : Important Zoom controls must be both enabled and displayed, via the respective bindable properties or methods, to be overlaid on a WebView.
Is this page helpful? Yes No. Any additional feedback? Skip Submit. Submit and view feedback for This product This page. View all page feedback.The Android framework provides several default views. The base class a view is the View. Views are responsible for measuring, layouting and drawing themselves and their child elements in case of a ViewGroup.
Views are also responsible for saving their UI state and handling touch events. Developers can also create custom views and use them in their application. View are typically created to provide a user interface experience with is not possible with the default views.
Using custom view allows the developer allow to do certain performance optimization, i. Once an activity receives the focus, it must provide the root node of its layout hierarchy to the Android system. Afterwards the Android system starts the drawing procedure. Drawing begins with the root node of the layout. The layout hierarchy is traversed in the order of declaration, i.
This happens as a top-down traversal of the view hierarchy. Every view stores its measurements. This is also a top-down traversal of the view hierarchy. During this phase each layout manager is responsible for positioning all of its children. It uses the sizes computed in the measure pass. Layout managers can run the measure pass several times. For example, LinearLayout supports the weight attribute which distributes the remaining empty space among views and RelativeLayout measures child views several times to solve constraints given in the layout file.
A view or activity can trigger the measure and layout pass with a call to the requestLayout method. After the measure and layout calculation, the views draw themselves. This operation can be triggered with the invalidate method from the View class. Custom and compound views can be used in layout files. For this you need to use the full qualified name in the layout file, e.
Alternatively you can also declare you name space in the layout file, similar to the Android name space. Every View class support the creating of an image of its current display. The following coding shows an example for that. Compound views also known as Compound Components are pre-configured ViewGroups based on existing views with some predefined view interaction.
Combound views also allow you to add custom API to update and query the state of the combound view. For such a control you define a layout file and assign it to your compound view.
In the implementation of your compound view you predefine the view interaction. You would define a layout file and extend the corresponding ViewGroup class. In this class you inflate the layout file and implement the View connection logic.In the past few years, manufacturers have started giving a lot of importance to the phone cameras. And, as a result, smartphones now have extremely good cameras. However, most of the native camera apps take pictures in the auto mode. These native camera apps don't allow users to play with the camera settings.
While smartphones can take amazing pictures in the auto mode, with manual controls you can take it to another level. Many third-party apps let you control the camera settings manually. You can adjust white-balance, ISO, shutter speed, exposure, etc. In this post, we have hand-picked 7 amazing manual camera apps for Android. These apps put DSLR like manual controls at your fingertips. You get all the necessary options on the first screen itself.
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Nothing is buried down in the settings. With this app, you can control ISO, light metering mode, focus mode, and white balance. You can also create time lapses and time-controlled picture series. In addition to program and speed-priority modes, you can also set manual shutter speed and view live histogram. Further, you also get multiple focus modes like Autofocus, macro, touch-to-focus, and infinity focus modes.
If you want to assign camera functions to volume keysthe app also lets you do the same. When it comes to organization, the app makes sure you get all the things such as customizable file names, storage locations, file format etc. Although you get all these features in the free app, the Lite version limits the resolution to 3. Open Camera includes all the manual camera controls. It is an open source app where you get all the features for free. There are no in-app purchases or ads.
Interestingly, you also get face detection. Further, the app offers cool ways to capture photos such as by a voice command or some other sound such as a whistle. Similar to the FV-5 Lite app, you get configurable volume keys and the ability to choose where to save the images. You can also add other things to your images like date, timestamp, and location coordinates. The app also supports timer, burst mode, HDR, and a widget that lets you take a photo with a single tap.
But, whatever it offers is present in a clean UI. However, to get that neat look, all the manual options are present under the three-dot menu icon making the process a bit longer.
Footej Camera supports exposure, timer, grids, multiple photos, and scenes. You can also create GIFs and slow-motion videos. In addition to that, the app also supports the RAW format and the ability to take a snapshot during video recording. It offers extremely cool manual features making you feel like you are actually using a DSLR camera.
Other than the usual controls like ISO, shutter speed, white balance, scenes, the app also offers the ability to shoot in RAW.Input controls are the interactive components in your app's user interface. Android provides a wide variety of controls you can use in your UI, such as buttons, text fields, seek bars, check box, zoom buttons, toggle buttons, and many more.
A View is an object that draws something on the screen that the user can interact with and a ViewGroup is an object that holds other View and ViewGroup objects in order to define the layout of the user interface.
There are number of UI controls provided by Android that allow you to build the graphical user interface for your app. The AutoCompleteTextView is a view that is similar to EditText, except that it shows a list of completion suggestions automatically while the user is typing.
An ImageButton is an AbsoluteLayout which enables you to specify the exact location of its children. This shows a button with an image instead of text that can be pressed or clicked by the user. You should use check box when presenting users with a group of selectable options that are not mutually exclusive.
The ProgressBar view provides visual feedback about some ongoing tasks, such as when you are performing a task in the background. As explained in previous chapter, a view object may have a unique ID assigned to it which will identify the View uniquely within the tree. Android - UI Controls Advertisements.
Previous Page. Next Page. Previous Page Print Page. Button A push-button that can be pressed, or clicked, by the user to perform an action. RadioButton The RadioButton has two states: either checked or unchecked.
How to Add Zoom Controls to Android MapView
Placing Zoom Controls in a MapView. How to reposition built-in zoom controls in MapView? Depending on what you're trying to do, you might find GoogleMap. This method allows you to define a visible region on the map, to signal to the map that portions of the map around the edges may be obscured, by setting padding on each of the four edges of the map.
Map functions will be adapted to the padding. For example, the zoom controls, compass, copyright notices and Google logo will be moved to fit inside the defined region, camera movements will be relative to the center of the visible region, etc.
Also see the description of how padding works in GoogleMap. Yes, you can change position of ZoomControl and MyLocation button with small hack.Android studio tutorial - Zoom Controls example in android. Zoom IN/OUT BOTH. NEW
In my sample I have SupportMapFragmentwhich is inflated from xml layout. Learn more. Asked 7 years, 5 months ago. Active 1 year, 3 months ago.
Viewed 24k times. How can i customize the position of the builtin zoom controls in a GoogleMap V2?
There are a lot of questions related to this topic for the Version 1 of Google Maps library. However, i wasn't able to find any questions in relation to the V2 of the library. In the V2, there's no method LinearLayout mapView. Thanks in advance. Robert Estivill Robert Estivill 11k 6 6 gold badges 35 35 silver badges 57 57 bronze badges. Active Oldest Votes.