different chat apps

Android studio uses gradle to dynamically build apps (different packages, different icons and labels) and androidgradle Recently, I have a requirement to create two apps with similar functions. Most of the Code is the same, but the interface is different. In the past, I had

Why do Android apps use MulticastSocket to listen for multicast? Why do they connect to different routes and run on different mobile phones? Some of them cannot receive multicast messages. ---------------------------!! Reprinted please indicate the source !! ----------------------- A project that uses Wi-Fi multicast to discover devices in the LAN. However, it is

The Metro style app runs on desktops, laptops, and tablets, and you need to design your applications for these different situations. Users may switch between devices, change the screen direction, or turn something (device or service, etc.) off or on, and your Metro style app needs to adapt to these situations. Touch, mouse, and keyboard inputWhen you plan your applications for touch operations and input, you can directly get support for mouse and keyb

Backwards compatibility is poor in Android, but an app app can be processed or run between versions. Backward compatibility is not good, different versions of the system its API version is different, naturally some interfaces are different, the new platform can not use the old API, the old platform can not use the new API.For the app to be more compatible, we can

[WebView 2]: using Web Apps to support screens with different resolutions, webviewapps We learned in the previous article (1. [one of WebView learning]: Introduction to Web Apps). Let's continue learning today. (Blog address: http://blog.csdn.net/developer_jiangqq), reprint please note. Author: hmjiangqq Email: jiangqqlmj@163.com Because Android devices have a l

requirements(2) drawalbe-ldpi: Low-resolution images, such as QVGA (240x320)(3) DRAWABLE-MDPI: Medium resolution picture, such as HVGA (320x480)(4) DRAWABLE-HDPI: High resolution pictures, such as WVGA (480x800), FWVGA (480x854)(5) drawable-xhdpi: At least 960DP x 720DP (less commonly used)Android will have automatic matching mechanism to select the corresponding layout and image resources, the system will be based on the resolution of the machine to find the corresponding image of each folder.

Backwards compatibility is poor in Android, but an app app can be processed or run between versions. Backward compatibility is not good, different versions of the system its API version is different, naturally some interfaces are different, the new platform can not use the old API, the old platform can not use the new API.For the app to be more compatible, we can

1 Tomcat deployment multiple Web apps can be set up with different encodings, ports, and Server.xml configured as follows:Type= "Org.apache.catalina.UserDatabase"description= "User database that can be updated and saved"factory= "Org.apache.catalina.users.MemoryUserDatabaseFactory"Pathname= "Conf/tomcat-users.xml"/>Connectiontimeout= "60000" maxthreads= "redirectport=" 8443 "uriencoding=" UTF-8 "/>" Resourc

1. Implicit intentHow to pass the value I will not elaborate, say some ordinary people do not know it.1) Verify There is a app to Receive the Intent (determine if an app responds with intent)You should always include averification step before invoking an intent.Caution: If you invoke an intent and there are no appavailable on the device that can handle the intent, your app would crash. (No Apply the processing intent, and the app will hang out. ）Because you can't guarantee that every phone has t

Because the new project is being re-planned, the database table structure is not the same as it used to be, but I want to save a lot of previous user certifications.So I looked at the Django Import and Export feature.~~~~~~~~~~~~~~~~~~~Data import:Auth.jsonTo export user data:Python manage.py dumpdata auth > Auth.jsonIf the following error occurs, you need to change all the errors in the JSON file ("Content_Type": 18), because the data tables are different