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As we all know, XML files and java files exist together in Android development. We can understand java as a method of creating and defining objects, while XML file is a visual interaction with users (i.e. UI interface). XML includes the following interactive functions: animation video, pictures (transparency, size, position), layout, buttons, t ...

1, What is Groovy 1. Official website: http://www.groovy-lang.org/ 2. Concept: It is a dynamic language based on JVM virtual machine. It is very similar to Java in syntax and fully compatible with Java. It can be said to be a very flexible dynamic scripting language 3. Application: Gradle's build script file is a Groovy script file, which ...

What are the fragments Fragment is a UI fragment that can be embedded in activities, which can make the program more reasonable and make full use of the space of the large screen. Therefore, it is widely used in tablets. Use of fragments Simple use of fragments Left layout_ fragment. xml <LinearLayout xmlns:android="http://schemas.andro ...

What problems does the Android collaboration solve?Handle time-consuming tasks that often block the main threadEnsure that the main thread is safe and that any suspend function is safely called from the main threadExample (asynchronous task)Implement an example of requesting network data: there is a button, a loading and a textview on the page ...

introduction By the way, if my article is of some help to you, maybe you can take a few seconds to move your finger to vote, thank you, through train Five star praise Come on, encourage each other! After the system server process executes the startbootstrap services method, it first creates and starts the Installer system service thr ...

Today, let's implement a custom view progress bar with a gap, with a heartbeat animation effect Take a look at the effect of the screenshot When it comes to custom view s, we need to implement the onDraw() method to operate the Canvas parameters it carries, and draw the layout style we want through the drawXXX() series of methods. How to re ...

preface To become an excellent Android Developer, you need a complete Knowledge system , here, let's grow up as we think~ As we all know, PhoneWindow is the most basic window system in the Android system, and each Activity will create one. At the same time, PhoneWindow is also an interface for interaction between Activity and View systems. De ...

1. App layer implementation Here, take two imageviews as examples to realize the function of dragging pictures from one ImageView to another 1.1 drag to start ImageView Uri imageUri = getFileUri(R.drawable.image, "image.png"); // Constructing the uri of an image ImageView imageView = (ImageView) view.findViewById(R.id.image_ ...

Backstage silent workers 01 service   service is a solution to realize the background running of programs in android It is suitable for performing tasks that do not need to interact with users and require long-term operation   the operation of the service does not depend on any other user interface. Even if the program is switched ...

PhoneWindowManager responds to the power key First, press the power key and then call frameworks/base/services/core/java/com/android/server/policy/PhoneWindowManager.. Interceptkeybeforequeuing method of Java: // TODO(b/117479243): handle it in InputPolicy /** {@inheritDoc} */ @Override public int interceptKeyBeforeQueueing(Ke ...