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select multiplexing in channel In the data communication system or computer network system, the bandwidth or capacity of the transmission medium is often greater than the demand for transmitting a single signal. In order to make effective use of the communication line, one channel is expected to transmit multiple signals at the same time ...

summary The previous article explained the knowledge points related to window and decorview. Interested readers can see the following: Android Window series (I) - window and decorview This article will continue to explore the relationship between window and view, mainly focusing on "how to add view to window". How to add View in w ...

1, Function description When using the mobile music player, you will see the buttons of "previous", "pause / play", "restart" and "next". It can be seen that the song name and singer name are displayed at the top of the screen, and four buttons are placed at the bottom to operate "previous&quot ...

overview LeetCode Hot: realize Trie (prefix tree), the K largest element in the array, the largest square, flip binary tree, palindrome linked list, the nearest common ancestor of binary tree, the product of arrays other than itself, the maximum value of sliding window, search two-dimensional matrix II and complete square number LeetCode ...

1, What is it Binder is an inter process communication mechanism of Android system. It is mainly composed of the following parts: virtual binder device (/ dev/binder), binder driver (binder. C in the kernel), ServiceManager, Service providing Service and Client invoking Service. Binder device and binder driver realize the protocol of process ...

brief introduction In this article, Android is used to obtain the Activity on the top of the mobile phone to monitor the usage of mobile applications Technical background In my daily study, I want to automatically collect the use time of various applications of mobile phone software, such as get, geek time, Keep, wechat reading, etc However ...

Android development from entry to masteryChapter III: LayoutSix of the Android layouts are:LinearLayoutRelativelayoutTablelayoutFrameLayoutAbsolute layoutGridLayoutLinearLayout (linear layout). We use the Weight attribute of LinearLayout more for screen adaptation. LinearLayout includes some basic attributes, the use of Weight attribute and how ...

preface From the previous articles, we can know the measurement and layout of ui. This time, let's first pay attention to how our ui is drawn. So here we first need to understand the specific drawing process and the role of paint and Canvas in this process Drawing process In previous courses, we mentioned that performmeasure, performlayout a ...

The following steps can be used for face detection:Load the model file and initialize the interfaceObtain authorizationCall face detection to obtain key pointsNotification draw keyRelease interface resourcesSteps 3 and 4 here are repeated after receiving the camera data. We can abstract these steps into data flow for encapsulation. Face + + con ...

Activity overview There are four components in Android: Activity, Service, BroadcastReceiver and ContentProvider. The Activity that we most often contact and users directly feel is Activity. Today, let's talk about the execution process and working principle of Android startup. Activity is a presentation component, which is used to show users ...