Arrangement of aircraft coordinate knowledge of Dajiang UAV
1, Geodetic coordinate system. GIS development, mobile development, web development, GPS (non professional GIS person, ask for light hammer if there is any error). The full text takes the development of Dajiang UAV as an example.
Our common civil coordinate systems include:
1. WGS84 coordinate system: that is, the World Geodetic System, which ...
Posted by geek_girl_2020 on Wed, 27 Apr 2022 05:19:54 +0300
22,23 . Content watchers, broadcast and services
Content visitor
Content visitors: 1. Get provider: getContentResolver(); ContentResolver object 2. Content provider of interview: addition, deletion, modification and query
ContentResolver resolver= getContentResolver();
uri uri=uri.parse("content://com. provider111/query");
Cursor cursor= resolver . query(uri ,null ,null ,null,null);
if(cur ...
Posted by tvance929 on Wed, 27 Apr 2022 04:38:56 +0300
Android P display process analysis --- get display configuration
Android P display management has been analyzed, the first part of SurfaceFlinger initialization, and the insertion detection process of the first Display device has been analyzed. Because there are many classes and interfaces in it, the analysis is very messy. The following is a UML class diagram I summarized.
UML class diagram
First of all, ...
Posted by gudfry on Wed, 27 Apr 2022 01:20:57 +0300
After reading the series: one article to get Kotlin basic introduction to advanced enhanced actual combat
preface: Kotlin is an extremely flexible language, which is a double-edged sword. Compared with Java, we all write in vernacular. Regardless of the level, we can basically read each other's code very smoothly. However, after using kotlin, due to the different expression level and thinking habits of kotlin, we can create such a situation, " ...
Posted by jonathandg on Tue, 26 Apr 2022 23:31:09 +0300
Three methods to achieve Android button click events, it is recommended to collect!
Button is an important control used by the program to interact with users. I believe you are very familiar with this control. It is one of the most commonly used controls. Since there are buttons, there must be onClick methods. Here are three methods to realize click events. You can choose a way you like to write.Let's first place a Button cont ...
Posted by lobobr on Tue, 26 Apr 2022 16:48:30 +0300
Java high-level language features -- generics
The generic type is jdk1 5 start introducing features. A generic type is both a parameterized type and is understood as taking the type of a parameter as a parameter. Generics can act on classes, interfaces, and methods. They are called generic classes, generic interfaces, and generic methods. The advantages of using generics are: 1. It is suit ...
Posted by tapupartforpres on Tue, 26 Apr 2022 10:27:40 +0300
AutoDispose source code analysis (2. How to unsubscribe according to the completable source of the life cycle)
In the previous article, we introduced that the Android lifecycle scopeprovider provides a completable source. This time, we'll see how to unsubscribe according to this completable source
public static <T> AutoDisposeConverter<T> autoDisposable(final CompletableSource scope) {
checkNotNull(scope, "scope == null");
return ...
Posted by kodstationen on Tue, 26 Apr 2022 08:15:16 +0300
Android: hook is "dangerous" and should be used with caution.
preface
Last article< AGP working principle of Android advanced technology sharing >We analyzed what AGP(Android Gradle Plugin) did and learned that AGP serves the packaging process.
So, this article will talk about the Transform and solve why it is in AGP 3 x. The version of X can be obtained through reflection. The transformClassesWith ...
Posted by SimpleManWeb on Mon, 25 Apr 2022 15:45:47 +0300
Rockchip RK3588 Android platform firmware burning tool summary
Rockchip RK3588 Android platform firmware burning tool summary
Development tool Android tool desktop version
Applicable scenario
Applicable system: window system The development tool provides developers with functions such as firmware burning, image burning, device erasure, device switching and firmware unpacking
Function list
Create ...
Posted by xfezz on Mon, 25 Apr 2022 13:09:12 +0300
Implementation principle and source code analysis of Handler
1, Use of Handler
1) Create global static constants
class Cons{
static final int MSG_WHAT_0x1000 = 0x1000;
static final int MSG_WHAT_0x1001 = 0x1001;
}
2) Create Handler object
private static Handler handler = new Handler(new Handler.Callback() {
@Override
public boolean handleMessage(@NonNull Message msg) {
...
Posted by shimmer on Mon, 25 Apr 2022 12:51:27 +0300