By Dave Smith, Erik Hellman
Realize greater than a hundred down-to-earth code recipes, protecting a variety of invaluable subject matters utilizing entire and real-world operating code examples. This publication is up to date to incorporate the Android N SDK (7.0), in addition to previous releases. filled with insightful guide and priceless examples, this 5th version of Android Recipes is your advisor to writing apps for certainly one of today’s most well-liked cellular structures. It bargains pragmatic recommendation to help you get the activity performed fast and good. this may prevent loads of paintings over making a venture from scratch. rather than summary descriptions of advanced options, in Android Recipes youll locate dwell code examples. for those who begin a brand new undertaking you could think about copying and pasting the code and configuration records from this publication after which enhancing them in your personal customization wishes.
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Extra resources for Android Recipes A Problem-Solution Approach
There are five states during a layout transition that each View in the layout may incur. An application can set a custom animation for each one of the following states: • APPEARING: An item that is appearing in the container • DISAPPEARING: An item that is disappearing from the container • CHANGING: An item that is changing because of a layout change, such as a resize, that doesn’t involve views being added or removed • CHANGE_APPEARING: An item changing because of another view appearing • CHANGE_DISAPPEARING: An item changing because of another view disappearing How It Works Listings 1-21 and 1-22 illustrate an application that animates changes on a basic LinearLayout.
This animation slides the views in and temporarily shrinks // the view to half size. WRAP_CONTENT)); } } In this example, we have modified the APPEARING, DISAPPEARING, and CHANGE_DISAPPEARING transition animations for our Button layout. The first two transitions affect the item being added or removed. When the Add Item button is clicked, the new item horizontally rotates into view. When any of the Remove buttons are clicked, that item will vertically rotate out of view. Both of these transitions are created by making a new ObjectAnimator for the custom rotation property, setting its duration to the default duration for that transition type, and attaching it to our LayoutTransition instance along with a key for the specific transition type.
Inside onDraw() is where we construct the display. Five concentric circles are painted onto the Canvas with a steadily decreasing radius and alternating colors. The Paint element controls information about the style of the content being drawn, such as stroke width, text sizes, and colors. When we declared the Paint for this view, we set the style to FILL, which ensures that the circles are filled in with each color. Because of the painter’s algorithm, the smaller circles are drawn on top of the larger, giving us the target look we were going for.
Android Recipes A Problem-Solution Approach by Dave Smith, Erik Hellman
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