The Paint class specifies how you draw on the bitmap. For performance reasons you may want to rewrite your combound view to a custom view which extends View. choosing a thesis topic ideas for computer science The requestLayout method call tells the view to measure and layout itself. Free use of the software examples is granted under the terms of the Eclipse Public License 2. The following shows an example of attributes defined for a new view called ColorOptionsView.
Once an activity receives the focus, it must provide the root node of its layout hierarchy to the Android system. BasedSavedState as a static inner class in the view for persisting the data. purchase college papers keisha martins Lars Vogel c , vogella GmbH Version 3. This is also a top-down traversal of the view hierarchy.
The requestLayout method call tells the view to measure and layout itself. To use these attributes in your layout file you have to declare them in the XML header. mba essay services contribution to schools Combound views also allow you to add custom API to update and query the state of the combound view.
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Using new views in layout files Custom and compound views can be used in layout files. The layout manager calls the onMeasure method of the view. This allows you to implement more efficient layout managers or to implement effects which are currently missing in the Android platform. The onMeasure method determines the size for the view and its children.
Activity ; import android. Drawing the view requires in this case less traversals and this can be significantly faster if implemented correctly. View are typically created to provide a user interface experience with is not possible with the default views. In this class you inflate the layout file and implement the View connection logic.
Menu ; import android. If the view should be re-drawn you call the invalidate method which triggers a call to the onDraw method of this view. It also provides methods for drawing operations:. To use a Shaders assign it to your Paint object via the setShader method. A layout manager is responsible to determine the size of all its children.
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The onDetachedFromWindow method can be used to stop animations and to clean up resources used by the view. About this website Support free content. phd no thesis for computer science pdf data mining These attributes are also assigned to the view.
Creating custom views 3. The setStyle method allows to specify how it should be drawn. custom paper for college example format The convention is to extend View.
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Simply define a BitmapShader for your Paint object and use the drawRoundRect method to draw a rectancle with rounded corners. If the view should be re-drawn you call the invalidate method which triggers a call to the onDraw method of this view. The following coding shows an example for that. This recursive call is the reason why you should not nestle layout to deeply.
Persisting view data Most standard views can save there state so that it can be persisted by the system. The onLayout positions the views based on the result of the onMeasure method call. You can define additional attributes for your compound or custom views.