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Today's top screen adaptation In a word, summarize the principle of realization: According to the width of the design drawing, calculate the density, then calculate the dpi, and replace the dpi in the system. Then the layout file can set the width according to the design drawing given by the UI, so as to achieve the purpose o ...

Java parses the Android manifest file tool class. Input the XML file path to get the APK package name, entry Activity, all permission lists and Activity lists. Function Description: xmlHandle() XML parsing entry method, parsing permission and activity list findPackage() Resolve package name information findLau ...

Today, I have a friend who wants to get the current ip of Android phone connected to the network and ask me how to do it. I think it's not easy. Tell him to judge the network environment first. If WiFi can be obtained through WiFi manager, if it is traffic (2G, 3G or 4G network), get getHostAddress() through NetworkInterface tr ...

Many people will use Media.getBitmap in onActivityResult to get the returned pictures when they call the gallery to select pictures, as follows: Uri mImageCaptureUri = data.getData(); Bitmap photoBmp = null; if (mImageCaptureUri != null) { photoBmp = MediaStore.Images.Media.getBitmap(ac.getContentResolver(), mImageCaptureU ...

Today, a strange thing happened. An Activity(A) was created after it was closed on the colleague's mobile phone. After debugging, it was found that every time the Activity(A) was closed, the life cycle of the previous Activity(B) would be triggered. Then the subscribed LiveData object would receive the OnChange message to creat ...

Download in webview using AsyncTask download (8.0 compatible) Write a class to inherit Asynctask, and download its file with Httpconnection in doinbackground. Postexecute is to open the download file (apk) after the download is completed private class DownloadTask extends AsyncTask<String, Void, Void> { // Pass tw ...

I've been working on some new features of C++ 11, and one of the things I noticed is the use of the double ampersand when declaring variables such as T&var. First of all, what is the name of this beast?I want Google to allow us to search for punctuation like this. What does this mean? At first glance, it may seem like a double ref ...

As you know, many APPs have incremental updates. Uni APP also introduced incremental updates at the beginning of this year. Today we will learn about them. Of course, many app markets, especially apple, reject incremental updates in order to prevent developers from providing illegal content to users without market review and approval.So with in ...

1. Determine whether it is an array   function isArray(arr){ return Object.prototype.toString.call(arr) ==='[object Array]'; } isArray([1,2,3]) //true   2. Judge whether it is a function (three kinds)   function isFunction(fn) { return Object.prototype.toString.call(fn) ==='[object Function]'; return fn.constructor == ...

In the section of adding graphic verification code in Spring Security, we have implemented the account password login based on Spring Boot + Spring Security, and integrated the function of graphic verification code. At present, another very common way of website login is SMS authentication code login, but Spring Security only provides the login ...