Programmer Group

Problem: on iOS, a page is nested by iframe. An element displayed at the bottom of the page in the content page cannot be displayed. The position of this element is fixed. Reason: because the height of Safari's iframe under iOS will adapt to the content of the page, resulting in the height of iframe is too high (that is, the h ...

I. Preface Recently, I saw the andix hot fix framework of Alibaba, but it seems that it can't support all devices. So, I need to manually implement Android hot fix once, and find out how to achieve it. Two, principle When Java's virtual machine JVM runs the code, it loads the. Class bytecode file, while Android's Dalvik/ART ...

For PHP + MYSQL transaction processing, first of all, transactions must be supported during database design, so when designing data tables, InnoDB is selected as the database engine. If the database engine selected does not support transactions, such as MyISAM, it can be locked through tables Here is a simple example of a tran ...

1. Wake up phenomenon of mobile assistant in the background com.qihoo.appstore and com.tencent.android mainly wake up in the background through JobScheduler and SyncManager events. Because most of the previous broadcast events, such as network static broadcast and application installation static broadcast, have been canceled b ...

Recently, I met a demand when I was making a project, that is to click the payment button on the mobile terminal payment page to pop up a payment keyboard, similar to that of Alipay. Because the project is just a mobile website, not an app, this function has to be implemented by the front end. If you don't say much, first look at the effect abo ...

Briefly: Requirements understanding: Among the many operators of rxjava, there are data transformation, filtering, etc., but sometimes there are some judging operations? For example, to judge whether all data of an Observable meets a specified condition, to judge whether an Observable will emit a specified value, etc., the answer is yes. Rxjava ...

Briefly: Requirements understanding: In Rxjava, when an exception occurs in the data processing and distribution, the observer will receive an Error notification. What if you don't want to send the exception notification and handle it yourself? Of course, the answer is yes. In Rxjava, many operators can be used to respond to the onError notific ...

thinking First of all, prepare a picture. Both the local picture and the network picture can be used as your background picture. Currently, the applet does not support screenshots. Here are the local pictures. wx.createCanvasContext(ා get the ID of the canvas) will be used drawImage(ා draw the picture onto the background pict ...

Display of Huanxin's Avatar and nickname - based on Easeui I am a college student. I used Huanxin to participate in the competition. I summarize and record the display method of Huanxin's head image and nickname (suffering). 1. First of all, you need to save your nickname and avatar locally when you log in successfully. When ...

Briefly: Several main needs Create an Observable directly Combining multiple observables Perform transform operation (transform operation) on the data transmitted by Observable Take a specific value from the data transmitted by Observable (filtering operation) Forward partial value of Observable (conditional / Boolean / filter operation) Evalu ...