Programmer Group

Recently, I have made a project about external code scanning on Android devices. Here, I record the problem about obtaining content from Android USB code scanning gun First of all, I use the USB HID code scanning gun, plug and play. Just have an EditText with focus on the interface to get the scanning content of the code scann ...

How to design a nice user name and password input box for Android studio Hello everyone, today is my first time to write a blog. I'm not familiar with the functions of blogging. Please forgive me and criticize me Equivalent to a registration page ----------<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:and ...

  Before Android 4.4, our application couldn't change the color of the status bar of the mobile phone, as shown in the figure above. In order to provide better interface interaction, google started to provide a method to set the immersive status bar in Android 4.4.2. The actual effect is the transparent status bar, and then ...

Android calls the system camera once, takes multiple photos and returns them to activity. In fact, Android does not provide such an api, but it can achieve this function in other ways. Idea: write down the time stamp before calling the system camera, and then go to the system picture media library to query the pictures whose c ...

First, let's take a look at the effect, first update 5 data items from top to bottom, then slide to the bottom and pull up to add 5 data items from the bottom to the top: We use a third-party library, so we first add it in the gradle configuration file: implementation 'com.android.support:recyclerview-v7:25.3.1' imp ...

Advanced controls Advanced control steps 3.1 obtaining data 3.2 create adapter Array adapter Simple adapter 3.3 binding adapter Differences between high-level controls and low-level controls: **Use adapter or not** 1: Auto prompt box 1.AutoCompleteTextView Case 1: automatic completion of data (array ...

Here are several steps: Set the Activity of the home page as the start page Rewrite onCreate, call two functions, defined animation function, monitor function First, set the start page: add the intent filter to the activity. The first action is to set the main page, and the second is specifically defined as the start page. ...

At present, there are two commonly used methods to send HTTP requests, one is HttpURLConnection (official recommended usage), the other is OkHttp (developed by Square) The first method: Get HttpURLConnection instance URL url = new URL("https://www.baidu.com"); connection = (HttpURLConnection) url.openConnection(); Set the m ...

Problem reason At present, the WIFI of the image compiled by our SDK is useless. We will continue to solve this problem. Check the schematic diagram and confirm the pin It can be confirmed from the schematic diagram that SDC1 module is used for WIFI, power supply is provided by VCC33-WIFI, and VCC33-WIFI is provided by CLDO3 ...

Brief introduction to life cycle method startService() Role: start Service service After manually calling startService(), internal methods are automatically called: onCreate(), onStartCommand() If a service is started multiple times by startService, onCreate() will only call once onStartCommand() calls = startService() calls ...