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I have some methods in my View that modify some of the shapes that are drawn when called. In Java in order to make sure the component is updated I would call repaint(). Is there something that will make sure my view is updated correctly?
Calling invalidate() will tell the view it needs to redraw itself (call onDraw) sometime in the future. So if you change something in your view, like the line thickness, call invalidate() after it. That way you know your view will eventually be updated.
Hybrid compositionappends the native android.view.View to the view hierarchy. Therefore, keyboard handling, and accessibility work out of the box.Prior to Android 10, this mode might significantlyreduce the frame throughput (FPS) of the Flutter UI.For more context, see Performance.
Certain Android Views do not invalidate themselves when their content changes.Some example views include SurfaceView and SurfaceTexture.When your Platform View includes these views you are required tomanually invalidate the view after they have been drawn to(or more specifically: after the swap chain is flipped).Manual view invalidation is done by calling invalidate on the View or one of its parent views.
For example, you could use a placeholder texturewhile an animation is happening in Dart.In other words, if an animation is slow while aplatform view is rendered,then consider taking a screenshot of thenative view and rendering it as a texture.
View is a basic building block of UI (User Interface) in android. A view is a small rectangular box that responds to user inputs. Eg: EditText, Button, CheckBox, etc. ViewGroup is an invisible container of other views (child views) and other ViewGroup. Eg: LinearLayout is a ViewGroup that can contain other views in it. ViewGroup is a special kind of view that is extended from View as its base class. ViewGroup is the base class for layouts. As the name states View is singular and the group of Views is the ViewGroup. In simple terms, a view is a user interface feature that we interact with when we use an app, such as a button, editing text and images, and so on. Android.view has a child class called View. Observe While the View group is the container that houses all of these views as well as many other ViewGroup such as linear or Frame Layout. For example, if we design and use the LinearLayout as the root feature, our main layout would be the LinearLayout. Within it, we can add another view category (i.e. another LinearLayout) and several other views such as buttons or TextViews.
The View class is the base class or we can say that it is the superclass for all the GUI components in android. For example, the EditText class is used to accept the input from users in android apps, which is a subclass of View, and another example of the TextView class which is used to display text labels in Android apps is also a subclass of View.
View refer to the android.view.View class, which is the base class of all UI classes. android.view.View class is the root of the UI class hierarchy. So from an object point of view, all UI objects are View objects. Following are some of the common View subclasses that will be used in android applications.
The ViewGroup class is a subclass of the View class. And also it will act as a base class for layouts and layouts parameters. The ViewGroup will provide an invisible container to hold other Views or ViewGroups and to define the layout properties. For example, Linear Layout is the ViewGroup that contains UI controls like Button, TextView, etc., and other layouts also. ViewGroup Refer to the android.view.ViewGroup class, which is the base class of some special UI classes that can contain other View objects as children. Since ViewGroup objects are also View objects, multiple ViewGroup objects and View objects can be organized into an object tree to build a complex UI structure. Following are the commonly used ViewGroup subclasses used in android applications.
During a session, you can refresh the photos displayed from your mobile device in Office Online and Desktop Apps by clicking the refresh icon in the top right corner of the picker window. If you do not see your photos but do see a QR code, you will need to scan that QR code with your android device and follow the instructions.
This class represents the basic building block for user interface components. A View occupies a rectangular area on the screen and is responsible for drawing and event handling. View is the base class for widgets, which are used to create interactive UI components (buttons, text fields, etc.). The android.view.ViewGroup subclass is the base class for layouts, which are invisible containers that hold other Views (or other ViewGroups) and define their layout properties.
All of the views in a window are arranged in a single tree. You can add views either from code or by specifying a tree of views in one or more XML layout files. There are many specialized subclasses of views that act as controls or are capable of displaying text, images, or other content.
Once you have created a tree of views, there are typically a few types of common operations you may wish to perform:
- Set properties: for example setting the text of a android.widget.TextView. The available properties and the methods that set them will vary among the different subclasses of views. Note that properties that are known at build time can be set in the XML layout files.
- Set focus: The framework will handle moving focus in response to user input. To force focus to a specific view, call #requestFocus.
- Set up listeners: Views allow clients to set listeners that will be notified when something interesting happens to the view. For example, all views will let you set a listener to be notified when the view gains or loses focus. You can register such a listener using #setOnFocusChangeListener(android.view.View.OnFocusChangeListener). Other view subclasses offer more specialized listeners. For example, a Button exposes a listener to notify clients when the button is clicked.
- Set visibility: You can hide or show views using #setVisibility(int).
Note: The Android framework is responsible for measuring, laying out and drawing views. You should not call methods that perform these actions on views yourself unless you are actually implementing a android.view.ViewGroup.
To implement a custom view, you will usually begin by providing overrides for some of the standard methods that the framework calls on all views. You do not need to override all of these methods. In fact, you can start by just overriding #onDraw(android.graphics.Canvas). Category Methods Description
Creation Constructors There is a form of the constructor that are called when the view is created from code and a form that is called when the view is inflated from a layout file. The second form should parse and apply any attributes defined in the layout file. @link #onFinishInflate() Called after a view and all of its children has been inflated from XML.
Layout @link #onMeasure(int, int) Called to determine the size requirements for this view and all of its children. @link #onLayout(boolean, int, int, int, int) Called when this view should assign a size and position to all of its children. @link #onSizeChanged(int, int, int, int) Called when the size of this view has changed.
"IDs">IDs Views may have an integer id associated with them. These ids are typically assigned in the layout XML files, and are used to find specific views within the view tree. A common pattern is to:
- Define a Button in the layout file and assign it a unique ID.
The geometry of a view is that of a rectangle. A view has a location, expressed as a pair of left and top coordinates, and two dimensions, expressed as a width and a height. The unit for location and dimensions is the pixel.
It is possible to retrieve the location of a view by invoking the methods #getLeft() and #getTop(). The former returns the left, or X, coordinate of the rectangle representing the view. The latter returns the top, or Y, coordinate of the rectangle representing the view. These methods both return the location of the view relative to its parent. For instance, when getLeft() returns 20, that means the view is located 20 pixels to the right of the left edge of its direct parent.
In addition, several convenience methods are offered to avoid unnecessary computations, namely #getRight() and #getBottom(). These methods return the coordinates of the right and bottom edges of the rectangle representing the view. For instance, calling #getRight() is similar to the following computation: getLeft() + getWidth() (see Size for more information about the width.)
The first pair is known as measured width and measured height. These dimensions define how big a view wants to be within its parent (see Layout for more details.) The measured dimensions can be obtained by calling #getMeasuredWidth() and #getMeasuredHeight().
The second pair is simply known as width and height, or sometimes drawing width and drawing height. These dimensions define the actual size of the view on screen, at drawing time and after layout. These values may, but do not have to, be different from the measured width and height. The width and height can be obtained by calling #getWidth() and #getHeight().
To measure its dimensions, a view takes into account its padding. The padding is expressed in pixels for the left, top, right and bottom parts of the view. Padding can be used to offset the content of the view by a specific amount of pixels. For instance, a left padding of 2 will push the view's content by 2 pixels to the right of the left edge. Padding can be set using the #setPadding(int, int, int, int) or #setPaddingRelative(int, int, int, int) method and queried by calling #getPaddingLeft(), #getPaddingTop(), #getPaddingRight(), #getPaddingBottom(), #getPaddingStart(), #getPaddingEnd().
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