Programmer Think

1, Introduction to DataBinding DataBinding is a tool support library launched by Google in 2015. With the help of this library, the interface components in the layout can be bound to the data sources in the application in a declarative format. DataBinding supports two-way binding, which can greatly reduce setText, findViewById and other codes. ...

JsonElement abstract classRepresents an element of a json stringAn element: JsonObjectJsonArrayJsonPrimitive (basic type)JsonNull Four subclasses of JsonElement JsonObject,JsonArray,JsonPrimitive,JsonNull JsonPrimitive  This class encapsulates the basic types of Java and their corresponding object classes. (short and full len gt h, single ...

Preface Activity can be started in two ways, one is the start process of root activity, the other is the start process of normal activity. The first one refers to the process that an app starts. A common activity refers to the process that calls the startActivity in an application. Nagan Activity is a more comprehensive startup, but also a go ...

When we operate the app, we will slide the page. How can we implement this process in python?   How to slide We all know very well how we manually slide on the app, and then automation is only implemented by imitating the manual method. We analyze it through a graph     When sliding from top to bottom, we usually press the coordinate (X1, Y1 ...

Mobile security has been paid more and more attention, and the conventional methods are not applicable. People prefer a method to solve the application security problem. At this time, companies specializing in application reinforcement appear. First of all, let's talk about what is shelling, why shelling, and what are the advantages and disadv ...

1. Preface First, let's take a look at Baidu Encyclopedia's introduction to the agency model: Definition of Proxy Pattern: provide a proxy for other objects to control access to this object. In some cases, one object is not suitable or cannot directly reference another object, and the proxy object can act as an intermediary between the ...

//Obtain video file information, such as the width and height of the video //The second parameter is a dictionary, which indicates what information you need to obtain, such as video metadata if (avformat_find_stream_info(pFormatCtx, NULL) < 0) { LOGE("%s", "Unable to get video file information"); return; } //Gets the index lo ...

Reprinted from: https://cloud.tencent.com/developer/article/1772873 1, Paging introduction In Android application development, we often need to display a large amount of data in the form of list. These data may come from the network or local database . In order to avoid loading a large amount of data at one time, it is necessary to page th ...

The namespace stores a collection of specific attributes, android, tools, app (custom namespace) 1,android xmlns:android="http://schemas.android.com/apk/res/android"  xmlns: that is, xml namespace, which declares that we are going to start defining a namespace   android: called namespace prefix, it is the name of the namespace   ...

In actual apps, pull-down refresh and slide up loading are more common forms of interaction. In the Flutter, there is a Flutter_ The easyrefresh open source plug-in is used to implement pull-down refresh and slide up load. This article introduces stateful components and fluent_ The basic application of easyrefresh completes asynchronous data lo ...