Android

Mongo, mongoWhen mongo is used for query, $ exists indicates whether the document contains the field, even if the field value is null. $existsSyntax: { field: { $exists: } }When is true, $exists matches the documents that contain the field,

Android's most popular quick development framework: AndroidAnnotations The Android fastest development framework androidannotations contains the eclipse configuration steps in this article. The Android fastest development framework

Android Image Compression Method Public static Bitmap revitionImageSize (String path) throws IOException {BufferedInputStream in = new BufferedInputStream (new FileInputStream (new File (path); BitmapFactory. options options = new BitmapFactory.

Android uploads images or photos to the server (including upload parameters) We have seen this in the 9ria forum and haven't tested it yet. Let's share it with you first.Recently, I want to build a project. I have to upload album photos and

Android implements the floating effect on the top of the ListView First, implement the following results: At first, I searched the internet to achieve this effect. The "purchase box" floating Effect of Meituan and public comments is also the same,

Two events occurred when the android system set the soft keyboard search key and listened to the search key click. Sometimes, in order to make the layout beautiful, no search button is found during the search, but the button on the software disk is

Android image compression method, Public static Bitmap revitionImageSize (String path) throws IOException {BufferedInputStream in = new BufferedInputStream (new FileInputStream (new File (path); BitmapFactory. options options = new BitmapFactory.

Learning android from scratch ,The main function of the ImageSwitcher component is to switch the display of images. For example, when you are browsing images, you can click a button to switch the displayed images, in addition, you can use the

Android design mode: Singleton mode; android Design Mode Design Patterns are some of the experiences accumulated by our predecessors during the development process. During the development process, we apply appropriate design patterns based on actual

Android4.4 System Browser Chromium-based loading module and Process This article only describes the information related to Http network requests. The types of Https, Spdy, file, ftp, websocket, and so on only refer to where the link branch appears.  

Android system development (2) -- GDB debugging toolDebugging process Let's take a look at the general debugging process in eclipse: 1. debug mode Compilation 2. Hitting a breakpoint 3. Run debugging 4. Single-step debugging Step into: Jump to

(Android review) Task Stack and Startup Mode This knowledge point is mainly understood as follows: I. task stack) 1. function: it is used to manage the activity entry and exit. Records user behaviors. 2. Example: Perform the following operations:

Android SharedPreferences complex StorageWe know that SharedPreferences can only store simple types of data, such as String and int. If you want to use SharedPreferences to access more complex data types (such as classes and images), you need to

(Android review) basic use of handler I. Basic knowledge points 1. Intent intent = new Intent (); // open the browser'sIntent. setAction (Intent. ACTION_VIEW );Intent. setData (Uri. parse ("http://www.baidu.com "));2. SystemClock. sleep (20000); //

Android adaption _ related concepts and applicationsThere are several concepts and related formulas: 1. dp: device independent pixels (device independent pixels ), is the ratio of pixels to density dp = px/density 2, dpi (dot per inch points per

How to implement common menu effects in ios and ios Currently, the following three types of edge menus are popular :()1. the menu bar is covered in some main views. The following is a good source code

(Android review) Use of dialog, androiddialog I. Basic knowledge points Common dialog Basic code:AlertDialog. Builder builder = new AlertDialog. Builder (this );AlertDialog dialog = builder. create ();Dialog. show ();1) Common Dialog BoxBuilder.

Android's most popular quick development framework: androidannotations The previously introduced xUtils is a fast development framework in China, but its annotation mechanism is not too stable and there are few annotations available, today, I will

Similar to yu'e Bao, the number slows down and the balance slows down. Find an Open Source Demo: https://github.com/PigRiver/NumberJumpDemo In the Demo, All integers are redirected. To make a jump with decimal digits, you only need to go to the

Android JSON for network data exchange, androidjsonWhat is JSON (JavaScript Object Notation) is a lightweight data exchange format, which is easy to read and write, and easy to parse and generate by machines. It is very suitable for the interaction