android viewgroup

(Motionevent ev);is an abstract method that is implemented by the implementation class of Window Phonewindow, and the code for the Phonewindow Superdispatchtouchevent method is as follows: public boolean superdispatchtouchevent (Motionevent ev) {return mdecor.superdispatchtouchevent (event); } As the above code is available, Phonewindow's Superdispatchtouchevent method actually accomplishes its work by Decorview Superdispatchtouchevent method, that is to say, The window of the cu

: layout_height = "wrap_content"Android: text = "Hello World"/> 3.2.1 layer of screen elementsThe basic function unit of an android application is an object in the activity-android. App. Activity Class. An activity can do many things, but it is not displayed on the screen. To display your activity on the screen and design its UI, you need to use view and

of as instructions on how to configure a component.　　View Hierarchy　　The component is contained in the hierarchy of the View object, which is the view hieratchy. Figure 1-10 shows the view hierarchy for the XML layout shown in Listing 1-2.　　As can be seen from the above, the root element is a linearlayout component. As the root element, the LinearLayout component must specify the namespace property of the Android XML resource file as: Http://schemas.

control such as a Button or CheckBox exists in a ListItem, the focus of the ListItem itself will be preemptible, And the touch Click Event of the ListItem itself will be invalid. There are three solutions to solve this problem: Change a Button or CheckBox to a control such as TextView or ImageView.Set the focusable attribute to false for controls such as Button or CheckBox. Set the root layout attribute of ListItem-android: descendantFocusability =

This example describes the Android view refresh mechanism. Share to everyone for your reference, specific as follows: I. GENERAL description In Android's layout system, the parent view is responsible for refreshing, layout, and displaying child view, and when the child view needs to be refreshed, notify the parent view to complete. Second, code Analysis 1). ViewGroup AddView method to understand the mea

the child control sends to it, the quilt control is blocked. (This is to deepen the memory. These two events are so troublesome to understand. Let alone remember, I must have forgotten them all at once. ^ 0 ^) (Note: Do you think it is related to consumption? Anyway, I have compiled the processing code for the event? The answer is yes! For example, the premise that ACTION_MOVE or ACTION_UP occurs is that ACTION_DOWN has occurred. If you have not consumed ACTION_DOWN, the system will think that

: layout_height = "wrap_content" android: spacing = "10dip"Android: layout_below = "@ + id/item_title" android: layout_marginTop = "20dip"Android: layout_marginBottom = "20dip"/> Colors. xml in the values Folder: [Html] JavaBean (ListItem) corresponds to the item items of each ListView: [Java]Package com. march. view;I

We have learned how SurfaceFlinger works. With this foundation, we can analyze the UI Implementation of the Android system on the Java layer from the beginning of this article. We know that among the four components of the Android Application, only the Activity component is related to the UI, which describes the application window. Therefore, we use its UI implementation to analyze the UI Implementation of

set for FragmentUse FragmentTransaction. the demo Effect of add: pay attention to it. Here we emphasize that BackGound is not set for the Fragment layout on the right. If BackGound is set, the implementation effect is no different from replace, this is also the main reason why so many times out today. We can see different implementation effects. We started to demonstrate the implementation code: We are using the layout file in the two methods of Fragment creation in

; Stackview: Stack displayDo not put many large images at a time, and the memory will overflow.You can drag and drop to remove the view from the stack.Android: loopviews defines whether to display view cyclically. Example: Package COM. light. android. study; import android. app. activity; import android. content. context; import

Listen to +7 elder brother said, the following all understand, interview must pass, so I tried to add to all the topics, you can be friends, if there is a spit groove or supplementary despite the message to me, here to thank you.1. How to communicate with multi-threaded AndroidA: Android provides handler and Looper to meet the communication between threads.Handler is the processor of the message that can publish or process or manipulate a runnable, ha

Android event distribution mechanism To understand the Android event distribution mechanism, you must first understand several concepts and summarize them. If you cannot understand them for the moment, this article will explain these issues. 1. Click the screen. First, the event is transmitted from the dispatchTouchEvent () method of the Activity. 2. There are three methods for

. fragment; import android. OS. bundle; import android. view. layoutInflater; import android. view. view; import android. view. viewGroup; import android. widget. textView;/*** fragment used to fill the interface ** @ author xuliu

Reprint Please specify source:http://blog.csdn.net/allen315410/article/details/41575831I believe that the Android SDK provides the Viewpager components, we are really familiar with, But Viewpager exists under the SUPPORT.V4 package, stating that Viewpager does not exist in earlier versions of Android, so how do you use Viewpager-like sliding effects in earlier versions of

Reprint Please specify source: http://blog.csdn.net/chziroy/article/details/44401615To understand the Android event distribution mechanism, first of all have to understand a few concepts, but also as a summary, assuming that the temporary can not understand it is no harm, this article will explain the several problems.1, click on the screen, first the event's delivery starts from the activity's Dispatchtouchevent () method.2, about the

Android learning-in-depth analysis of Android Fragment People who have some experience in the interview have a deep understanding. Fragment knowledge is usually asked during each interview. So today I will share Fragment with you separately. How Fragment is generated, what is Fragment, Fragment lifecycle, static and dynamic use of Fragment, Fragment rollback stack, Fragment transactions, and some special us

Use Code Dynamic Layout and Android layout in android Dynamic code layout in Android This article describes how to use dynamic code layout in android. Sometimes, based on different requirements, such as the number of entries on the server, the page layout control (display number, icon, etc.) in the app is determined )

Android Android-build an android development environment, android-android Android official website address: http://developer.android.com/, download and install AndroidSDK following the steps below: Download ADT and SDK: http://dev

. There's a new business coming up this day.At this time, Xiaoming has a lot of options, he can choose to deal with this business, of course, you can also choose to distribute the business to the staff to deal with. This is what we call "distribution."This case is the same for Android, and if we can guarantee that there will always be only one view on the current screen, there's nothing left to do with touch events.But it is clear that there is usuall