Programmer Think

1, To create a basic project 1. Create an app project first 2. Select Basic Activity 3. Complete basic project creation 4. Run it to see if the virtual machine is available 5. Connect real machine test Because the camera function will be used, you need to use the real machine for testing. Next, configure the real machine for testing. Ref ...

Android Activity Life cycle: onCreate(): it is called when the activity is created for the first time, so it completes the initialization of the activity in the method, such as loading layout file, initializing View, event binding, etc. Will only be called once.onStart(): this method is called when the activity changes from invisible to vis ...

1, Foreword Next, we will install and debug the groundsdk Android in the linux environment. The official documents given by Parrot are generally no problem, but I have never been in contact with Android development before, so I have encountered some difficulties, which is hereby recorded.The following is a link to the official installation ...

GridView GridView can build a two-dimensional grid list, and its default constructor is defined as follows: GridView({ Key? key, Axis scrollDirection = Axis.vertical, bool reverse = false, ScrollController? controller, bool? primary, ScrollPhysics? physics, bool shrinkWrap = false, EdgeInsetsGeometry? paddin ...

We do not actively declare the class of the Activity, so how does the system find the corresponding Activity for us? In fact, this is the same as the normal Activity startup process, except that the implementation of if / else is different. The beginning of doubt Have you ever thought about a question: where browser Open a web page in. There ...

Then, the above implementation gradually expands several functions. For example, you can view the address book and dial directly by clicking the contact entry. In fact, functions are often accompanied by the mastery and use of components. When you master the use of all components, you can probably play flowers as you like. The main technolog ...

[Android] Activity of Android's four components (1) preface Activity is an important component in Android learning. If you want to systematically understand it, you can divide it into several parts. The content of this large chapter is about page Jump and data transfer between activities, followed by the explanation of the life cycle in activ ...

Implementation of three-point menu list in the experiment of fundamentals of mobile application design Experiment Name: Implementation of point menu list Tools, software and environment used: JDK1.8，Android Studio 1, Purpose of the experiment: Further understand the use of various Android controls, deepen the use of control propert ...

Android Bitmap I Definition of Bitmap Bitmap is one of the most important classes of image processing in Android system. It can be used to obtain the image file information, cut, rotate and zoom the image, and save the image file in a specified format. There are two main uses of Bitmap: 1. Set the background for ImageView2. Use as canva ...

DocumentUI process analysis DocumentUI is a document manager. In our daily use, in addition to a separate entry, we enter it more by selecting documents through other applications. In the source code of Android 12, the Mainfest file also provides us with two methods to enter activities through LauncherActivity and FilesActivity. The specific c ...