android basic daydreams

Keywords: Android capacitive screen TP ItoPlatform information:Kernel: linux2.6/linux3.0System: Android/android4.0Platform: s5pv310 (Samsung exynos 4210) Author: xubin341719 (You are welcome to reprint it. Please note the author) Android capacitive screen (I): Basic Principles of Capacitive Screen

Usually use the database where not many, here to record the shell terminal directly to the basic operation of the DB!Writing is not easy, reproduced please specify the source: http://blog.csdn.net/jscese/article/details/40016701I. Concept:Sqlite3 is a lightweight database for Android, small and handy for managing various DB files on Android, and able to install S

Basic knowledge of the Linux kernel: process isolation/virtual address space : In the operating system, in order to protect a process from interfering with each other, a technology called "process isolation" is designed to prevent process A from manipulating process B's data. While the process isolation technology uses the virtual address space, the virtual address space of process A is different from the virtual address space of process B, a

( Event.getaction ()) {case Motionevent.action_down: {Mpath.moveto (Eventx, eventy); Mlasttouchx = Eventx;mlasttouchy = Eventy;} Return true;case MotionEvent.ACTION_MOVE:case motionevent.action_up: {resetdirtyrect (Eventx, eventy); int historysize = Event.gethistorysize (); for (int i = 0; i Postscript: due to the Android messaging mechanism problem, the drive layer passed to the top of the point due to delay will be lost part, resulting in the upper

1, APK is the Android application installation format,. Dex is the Android binary execution file format.2, the Android operating system is a multi-user operating system based on Linux, each application is used by different users.3, by default, an application of a UserID, system settings, you do not need to manually set,For such an application, the user has permis

Android BroadcastReceiver basic description 1-Overview of BroadcastReceivcer1. What is broadcast BroadcastReceiver? It is one of the four major Android components. In essence, BroadcastReceiver is a global listener used to listen to broadcast messages globally in the system. Therefore, it can easily implement communication between different components.2. Create a

; Itemandroid:drawable= "@drawable/button_focused"android:state_focused= "true" /> Itemandroid:drawable= "@drawable/button_default" />selector>Activity_main.xml.xmlXML version= "1.0" encoding= "Utf-8"?>LinearLayoutxmlns:android= "Http://schemas.android.com/apk/res/android"Xmlns:tools= "Http://schemas.android.com/tools"Android:layout_width= "Match_parent"Android:layout_height= "Match_parent"android:orientation= "vertical"Tools:context= "Com.huhx.

The Android development process, must have used Photoview to achieve the function of image display. The latest version of the SDK (ANDROID-23) has a native Photoview, and the code implementation is simple and logic is clear. In our actual work, the requirements that we encounter may be slightly different from the existing features of these photoview, need to be modified, or re-developed. This article briefl

{ //use ' jcenter ' for resolving Your dependencies. You can declare any maven/ivy/file repository here. Mavenlocal ()//MAVEN local library maven{url ' XXXXX '}//maven Mavencentral ()//direct to the Web under jcenter ()}//in this section you declare the dependencies for your production and test Codede pendencies { //The Production code uses the SLF4J logging API at compile time compile ' org.slf4j:slf4j-api:1.7.13 ' //Declare the dependency for your favourite test fra

...... .....What's the situation? The function body has been declared. As no error and warning, a run error.Then give the correct code, and you understand it yourself:#include #includestring>extern "C"{intcount (); Jniexport jstring Jnicalljava_com_ailin_shoneworn_ndkdemo_mainactivity_stringfromjni (JNIEnv*Env, Jobject/* This*/) {std::stringHello ="Hello from C + +"; returnEnv->Newstringutf (Hello.c_str ());}intcount () {intA =1; intb=2; returnA +b;} Jniexport jint Jnicalljava_com_ailin_shonewo

Android develops learning notes, learns together, and progresses together.Android software Development first installs the JDK, this article demonstrates the installation step with the WINDOWS10 64 operating system as an example.1. Download the JDK　　2. Installation　　3. Configure Environment variables　　4. Test the installation Results　　The development IDE for Android has now evolved from Eclipse to

You should not use HTTP Basic authentication. That's not safe because it sends a username and password by asking for hair. You should consider something like OAuth to replace it.But aside from the original, sometimes you'll use it. And you will find that there is no way to work with documentation. You can try each of them in a separate way without success. So you should not rely on the Apache library approach. You should implement your own validation.

Canvas refers to the canvas, which is an area on the screen. We can use various APIs to draw what we want. It can be said that canvas runs through the entire 2D graphics, and almost all classes in Android. graphics are directly or indirectly related to canvas. Therefore, understanding canvas is the basis for learning 2D graphics. The official Android documentation provides a good introduction to canvas: Th

Original address: ArcGIS Runtime for Android Development tutorial V2.0 (4) Basic---mapview-arcgis_mobile column-blog channel-csdn.nethttp://blog.csdn.net/arcgis_mobile/article/details/8147328 Mapview is the core component of the ArcGIS Runtime SDK forandroid, where data from the map service can be rendered, and rich properties, methods, and events are defined in Mapview, and users can manipulate the device'

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~packages/|–apps (various applications, such as contacts, browsers, etc.)|–experimental (some experimental projects, such as Bug reports)|–inputmethods (Input Method related)|–providers (various data source implementations, such as contact data, Media Library, and other information)|–wallpapers (Various wallpaper programs)Introduction to Android Framework FeaturesAndroid.app: Provides a * * program model and

Basic Process of android init process analysis (The lazy recently remembered that I still have csdn for a long time and I haven't taken care of it. This android init has been lying in my draft box for almost five years. Let's change it a little) When the android device is powered on, the boot program directs to boot (u

"bit" or "bit", which is the basis of computer operation;byte means "byte", which is the basic computing unit of computer file size;1byte = 8bits. The two conversions are 1:8 of the relationship.Two bytes of a Chinese character.1BIT=1/16 a WordSo 16bit=1 a Chinese character11.Intent filter mechanism12. The mechanism of AM basic operation of Vim14.Serializable and Parcelable differencesThe problem with the

= "Match_parent"5 Android:layout_height= "Match_parent"6 />3rd Act The framelayout adds an ID number to facilitate subsequent use. This framelayout is where the fragment1 appears. Note that this layout file is not limited to an object of a fragment class, it only describes the basic information of a container.2. Create UI FragmentThe steps to create a UI fragment are the same as for creating an activity: Define layout file, assemble inter

Keywords: android capacitive screen TP ITOPlatform Information:Kernel: linux2.6/linux3.0System: android/android4.0Platform: s5pv310 (Samsung Exynos 4210)xubin341719 (Welcome reprint, please specify the author)Android Capacitive-Touchscreen (i): The basic principle of capacitive screenAndroid Capacitive-touchscreen (ii)

Android -- Fragment introduction and two basic usage methods Today, when we call ViewPager, we feel that ViewPager + Fragment is more flexible. Therefore, we can sort out the Fragment and try again. I. Why Fragment? 1. Flexible Layout Fragment represents an action or part of the UI in an Activity. Multiple fragment can be combined and placed in a single activity to create a multi-Interface UI, and a fragme