privileged process android

"We're not producers, I'm just a nature porter. ”The best way to learn Android is of course a powerful official document, with a detailed introduction to the process Lifecycle elimination priority in the processes and Threads section. The original text reads as follows:Process lifecycleThe Android system tries to maintain a application

how View worksIn Activitythread, when activity is created, the Decorview is added to the Window, the Viewrootimpl object is created, and Viewrootimpl and Decorview are associated, and Decorvie W is a top view of the Activity, in a default theme, it is divided into the title bar, and the content area, we added the view is added to the Decorview content area, the added view of the workflow is formally completed through Viewrootimpl OfViewroot, Decorview and View of the three major processes:

walk two times. Of course, this involves a lot of isolation, such as install, lock screen, some settings, etc., so after looking at the source code after 4.2, will find that basically all the modules are related to multi-user judgment, this shows that android in the addition of users this feature, Google developers have done a huge amount of work Ah, Here expresses admiration and gratitude. OK, gossip less, continue to talk about the phone

This article simulates three roles: Android architect-Fulamatu, Android control development engineer-small black, Android development engineer-Small white, below three roles to analyze the measure process in different angles.Xiao Fu is responsible for sharing : The essence of measure-OK Measure code Flow-A

Digress: As one-to-one is explained orally by a colleague for consultation, it is not convenient for multiple parties to spread and inherit. Therefore, I would like to write this article to explain it. 1. Brief description of android service: Android Service, also known as Java Service, is a Service implemented in the framework layer and written in Java.Native Service, also known as System Service, is a Ser

Scroroller for Android (5)-detailed explanation of scroroller call process and View re-paintingMainActivity is as follows: package cc.ww;import android.os.Bundle;import android.widget.ImageView;import android.widget.ImageView.ScaleType;import android.widget.RelativeLayout;import android.widget.RelativeLayout.LayoutParams;import android.app.Activity;import android.content.Context;public class MainActivity ex

start will not go application this step, but directly go mainactivity (including a series of measurement, Layout, drawing), So the hot-start process simply needs to create and initialize a mainactivity, without having to create and initialize the application,Because an application is created from the new process to the destruction of the process, application is

not directly related to the view layer, meaning that the layout section and the Java Code section can be developed independently. When both are developed, only the control layer must be builtContact will be able. Similar to presentation separation.3 facilitates code reuse.5 Android Project DebugThere are three ways to fix anomalies in your project by using Android Studio to develop

Original link http://sparkyuan.me/2016/03/14/Four components of the work process/reprint annotated sourceThe system of the four components of the process of a large degree of encapsulation, daily development does not need to understand the underlying principle of work, then the significance of the study of these principles where? If you want to be more technical, then it is necessary to understand

This article examines the Android Camera subsystem from the process/file perspective based on Android 4.2.2. The overall architecture of the AndroidCamera subsystem is divided into two parts: Client and Server. They are built on the basis of the Android inter-process commu

Measure calculation process of View in Android In Android, Veiw goes through three phases in sequence from memory to display on the UI: Traffic calculation-> Layout-> drawing, for details about the overall mechanism of View calculation, layout, and drawing, see the layout and Drawing Mechanism of View in Android. Volu

Android compilation process (I): http://www.cnblogs.com/mr-raptor/archive/2012/06/07/2540359.html Android compilation process (2): http://www.cnblogs.com/mr-raptor/archive/2012/06/08/2541571.html Android compilation process (3): h

Android 5.1 _ SystemUI detailed analysis of the startup process, android5.1systemui Preface:Getting started with Android, for the SystemUI startup process, refer to many posts on the Internet, most of which are Android2.3 and Android4.0 ICS posts. They are also very detailed, but for

In android, the APP uses SmsManager. java provides a series of methods to send text messages, and there are many types of content to be sent, such as sendTextMessage, sendMultipartTextMessage, and sendDataMessage, in this article, we will take one of them as an example to describe the complete process of sending text messages. If there are any mistakes, please correct them and learn together. 1. starting po

can only reboot, can not be shutdown operation, you will be able to track the process in the course of the discovery, It is true that there is an associated interface with a shutdown. So what's the use of shutting down the machine?Frameworks/base/services/java/com/android/serverbatteryservice.java Private final void Shutdownifnopower () { //Shut down gracefully if we battery are critically low and

1. boot system initialization. For detailed procedures, see (System/CORE/init. c) In the main function. At this time, the screen displayed on the mobile phone or simulator is a console that displays "android" MSG. If (FD> = 0) { 2. Mount process --> after successful initialization, start the mounting system. For details, see the main function in (System/CORE/mountd. C. Mkdir ("/dev", 0755); 3. Run android

Android ends the process and closes the program. After several days of research, we found that Android ends the process. The following class is used: Void android. app. ActivityManager. restartPackage (String packageName) Public void restartPackage (String packageName) Since

First, IntroductionA process is a running instance of a program that distinguishes the "program" from the static concept. Thread is the basic unit of CPU calls.Ii. components of the processThe four components in Android are part of the process, and the Android app creates the app p