By Jason Ostrander
Writer Jason Ostrander walks builders throughout the diverse offerings to be had on their technique to making a well-designed program for Android. whereas development an easy program, Jason works during the fundamentals of Android UI improvement together with format, occasion dealing with, menus and notifications. the writer then exhibits the right kind strategy to load and show photos, create complex dialogs and development signs, upload animation, and the way to construct customized UI components. Jason discusses the right kind manner of including interplay via gestures and the complex graphical concepts to be had utilizing Canvas, Renderscript and OpenGL. eventually, he discusses pill improvement, the original transformations among mobilephone and pill UI, and the hot APIs to be had to pill builders.
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Additional info for Android UI Fundamentals Develop & Design
This attribute sets rules on the view to ensure that it never crosses the boundary set by the edge of the target view. The value must be the id of another view. It can be tricky to master using the relative layout, but it will pay off when you create more-complex UIs. Remember that if you find yourself creating multiple nested linear layouts, you should consider using a relative layout to optimize the drawing of your UI. Note: You cannot have a circular dependency in a relative layout. So, for example, you cannot set the width of the RelativeLayout to wrap_content and use alignParentTop on one of the child views.
Each time the user rotates their phone, the activity that is currently displayed is destroyed and re-created. In addition, the Android system may destroy an activity if the device is running short of memory or resources. It’s important to design your activities with the understanding that they can be killed at any time. Take care to save any state the user might value. If your activity is destroyed, you don’t want to frustrate your users by making them re-enter text. You will learn more about how to save activity states in the next chapter.
It simply presents each view, one on top of the other. The order of the views is based on their declaration in the XML file: Views declared later in the file are drawn on top. Use this layout whenever you want to create overlapping views. FrameLayout is especially useful when creating customized tappable elements. You can use the FrameLayout to pair a button with an ImageView, setting the button background to be transparent. This gives you more control over the padding and scaling of button images than just setting a background does.
Android UI Fundamentals Develop & Design by Jason Ostrander