android programming big nerd ranch guide

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ongesturelistener, it does not have a description, who can understand the relationship and difference between onlongpress and Onshowpress,onscroll and onfling before attempting to do it continuously? Google really needs to do a big surgery on the documentation. But fortunately, after my repeated attempts. These gestures are defined from a personal point of view.Press (Ondown): Just the moment the finger touches the touch screen, it is the touch of th

. Android:orientation PropertiesThe Android:orientation property is a property of two linearlayout components that determines whether the component is placed horizontally or vertically . In the XML above, the root linearlayout is vertical and the sub-linearlayout is horizontal.The order in which the LinearLayout subcomponents are defined determines the order in which they appear on the screen. In a vertical linearlayout, the first defined subassembly appears at the top of the screen. In the hori

Month: ==! ）In the second window, clear the option to create a custom launch icon (created custom launcher icon) that has been checked. The Geoquiz app only needs to use the default startup icon. Confirm that the Create Activity option is selected. Such as:Figure 1-4 Configuration ItemsClick Next.The window shown in 1-5 asks what type of activity you want to create. Select the blank Activity.Figure 1-5 Creating a new activityContinue to click Next.In this window, the named activity sub-class is

"Android:text= "@string/question_text"/> LinearLayout android:layout_width= "Wrap_content"Android:layout_height= "Wrap_content"android:orientation= "Horizontal" > Button android:id = "@+id/true_button"Android:layout_width= "Wrap_content"Android:layout_height= "Wrap_content"Android:text= "@string/true_button"/> Button android:id = "@+id/false_button"Android:layout_width= "Wrap_content"Android:layout_height= "Wrap_content"Android:text= "@string/false_button"/> Code Listing 1-6: Adding a Resource I

The first app to be written right now is Geoquiz, who can test the user's geographic knowledge. The user answers the question on the screen by clicking the True or False button, Geoquiz can instantly feedback the answer correctly or not.Figure 1-1 shows the result of the user clicking the false button.　　1.1 Application Basics　 The Geoquiz application consists of an activity and a layout.　　activity is a specific instance of the activity class in the Android