Programmer Group

For developers, design patterns can sometimes be a barrier, but design patterns can be very useful, beyond which you can move up a notch.In the development of Android, it is necessary to know some design patterns, because design patterns are ubiquitous in Android source code.For students who want to study design mode systematically, here is a B ...

Database Storage 1 Store data using Shared Preferences Scope of application: save a small amount of data, and the format of these data is very simple: string type, basic type of value. For example, application configuration information (such as whether to turn on sound effects, whether to use vibrat ...

Preface   What is a D ball??? D-ball is an industry ecological value sharing platform based on block chain. What on earth is this D-ball for??? If you're interested, you can. Click D ball. Detailed understanding.   Let's not talk about this. Let's talk about how to realize the animation of D b ...

Android Elegant Privilege Request Encapsulation Let's first look at how the code is written without encapsulation. Here we first need to determine whether there is a specific permission. If there is a specific operation, otherwise we need to request permission. The final result of the request can only be processed in onRequest Permissions Resul ...

Today, I want to share with you a red packet of how to use Python technology to capture video! Not only can you learn Python technology, but you can also make money. Hand-in-hand teaching, with source code! After reading, I think we can have a wave of watching + forwarding! 1 Target scenario Pytho ...

Preface: Recently, the new Flutter project has the requirement of "Ali Cloud Push Notification", that is, when Flutter's App starts, it detects a new notification, clicks the notification bar and jumps to the specified page. Here I use the third-party plug-in Rammus to push notifications. I always used Fcm to push notifications befor ...

Written in front I wonder if you've ever encountered an if else nest like a "pyramid lying across": if (true) { if (true) { if (true) { if (true) { if (true) { if (true) { } } } } } } I'm not exaggerating. I really ...

Why annotations As an Android developer, first look at some familiar code: setContentView(R.layout.activity_main); Toolbar toolbar = findViewById(R.id.toolbar); new ViewHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.xxx, parent, false))); Non-ellipsible code like this, which appears in large numbers everywhere, is copied ov ...

A Brief Introduction to Point Nine Diagrams In order to use the same image as the background of different quantities of text, Android designed an image format ".9.png" which can specify the area stretching. This image format is point nine. Note: This image format can only be used in Android development. In ios development, you can spe ...

Let's start with a black and white screen, or a GIF first APP black and white screen on the market From one of the above recordings, we can see that some of the common APP startups on the market are white or optimized.Blackscreen is only in Android 4.n which version I forgot.So now let's start optim ...