(i) PrefaceIn a previous post about AMS, mention a little bit of tabactivity. At that time said it is more special there is no following, today, re-send a post, to discuss with you about tabactivity.Make a hypothesis: for example, our outermost activity is mainactivity, the first tab is Firstactivty, the Second tab is secondactivity.I believe everyone has used tabactivity, it is a special activity, where is its special place? The following points are
We know that the activity in AMs in the form of Activityrecord,task in AMs in the form of Taskrecord, process in AMS management form is Processrecord.Let's look at the previous version of 4.4:Prior to android4.4, the AMS management Task was to manage all the activity through a ArrayList mhistory:The conclusions are as
3 activity design framework 3.1 activity outside the feature space
Let's take a look at the activity in the external feature space that Android app developers are exposed to. For AMS, this activity is a customer service activity. When creating an Android Application, the app programmer builds the sub-class of the activity to display the feature space outside andoid. The following simple example describes how to create an activity.
Demoactivity exten
Stack structure changes of Android 4.4
We know that the form of activity in AMS is ActivityRecord, the form of task in AMS is TaskRecord, and the management form of process in AMS is ProcessRecord.
Let's take a look at versions earlier than 4.4:In versions earlier than Android 4.4, the AMS management Task manages all t
1. What is ANR?
ANR (application not responding) means that the application has no response.
2. What is the cause of ANR?
The root cause of ANR is that the app blocks the UI thread. In the Android system, each app has only one UI thread, which is generated by default when the app is created. The UI thread initializes a message loop by default to process UI messages, ANR often times out when processing UI messages. What are the sources of the UI message? There are two main sources:
2.1 callba
performs other startup items according to the inittable file-->Thus, when the kernel is initialized, a fairly important ancestor process is initiated, that is, the init process, where all processes in Linux are directly or indirectly forked by the INIT process. For Android, the previous process is the same:(1) When the init process is created, it will fork out a zygote process, which is the parent process of all Java processes. We know that Linux is based on C, and Android is Java-based (and of
First, downloadAdobe/flash MS5.0:http://fs1.d-h.st/download/00036/VOt/adobemediaserver_5_ls1_linux64.tar.gz#./wget http://fs1.d-h.st/download/00036/VOt/adobemediaserver_5_ls1_linux64.tar.gzSecond, installation#./TAR-XVF adobemediaserver_5_ls1_linux64.tar.gz#./CD ams_5_0_1_r1076#./installamsalways press ENTER, select the default option, if all goes well to this step, you can install the completion, after the following tips:-----------Install Action Summary-----------installation directory =/opt/a
implementation of the start activity is done by the Activitymanagernative.getdefault (). StartActivity method. This method returns Activitymanagerservice.
Activitymanagerservice (AMS) inherits from Activitymanagernative, And Activitymanagernative inherits from Binder and implements the binder interface of Iactivitymanager, so AMS is also a binder.
AMS Th
We know that the activity in the form of AMS is activityrecord,task in the form of AMS Taskrecord, the process AMS that management form Processrecord.Let's look at the version number before 4.4:android4.4 the previous version number, the AMS management Task is to manage all the activity through a ArrayList mhistory:Con
server2. execute the Com.android.server.SystemServer class in the function main ().In addition to these two main things, there are some additional configuration of the runtime environment, which are mainly done in function commoninit () and function zygoteinitnative (). Once you have configured the Systemserver process environment, run from the main () function in class Systemserver.1. Start various system service threadsThe systemserver process plays a central role in the Android environment ,
First, downloadAdobe/flash MS5.0:http://fs1.d-h.st/download/00036/VOt/adobemediaserver_5_ls1_linux64.tar.gz#./wget http://fs1.d-h.st/download/00036/VOt/adobemediaserver_5_ls1_linux64.tar.gzSecond, installation#./TAR-XVF adobemediaserver_5_ls1_linux64.tar.gz#./CD ams_5_0_1_r1076#./installamsalways press ENTER, select the default option, assuming everything goes well to this step, it can be installed, after the completion of such as the following tips:-----------Install Action Summary-----------in
The PHP7 upgrade practice of the web system which has requested billions of days
Author: Xu Hanbin, Wang Mehan, Liao Mao, Kuansuven, Liao, Hu Zemin
Source: CSDN
QQ member activity Operation Platform (AMS), is one of the important carriers of value-added operation Business of QQ member, and undertakes the web system of massive activity operation. AMS is a major use of PHP language implementation of the ope
Resources:Http://www.th7.cn/Program/Android/201406/213377.shtmlBy adding the android:persistent= "true" attribute to the application tag in Androidmanifest.xml, it is true that the process is guaranteed not to be killed by LMK. However, the premise is that the application must be a system application, that is, the application cannot use the usual installation method. The app's APK package must be placed directly under the/system/app directory. And the system must be restarted before it can take
Hi, this is my Android 4.4 based on the development of the Multi-window system, there are a lot of shortcomings, please also advise Ah, the code is all open source.Video AddressSource AddressDone:1. The app is displayed in windowed formatFilter by PackageName in PHONEWINDOWMANAGER::LAYOUTWINDOWLW () to make the specified app appear in a non-full-screen size, because an app typically displays multiple activity in a task unit, Therefore, the method of PackageName filtration is adopted.2. Multiple
provided. opencore is the core module of this module.
CameraService
Supports recording and preview functions of camera.
AudioPolicyService
The main functions include checking the connection status of the input and output devices and switching the system's audio policy.
9.4.1 start various system service threads
The SystemServer process plays a "neural Hub" role in the running environment of Android. Most system services that can directly interact with the APK application run in this proces
Hi, this is a multi-window system developed based on Android 4.4. There are still many shortcomings. Please advise me more. The code is already open-source.
Video addressSource Code address
Done:
1. The APP is displayed in a window
In PhoneWindowManager: layoutWindowLw (), the packageName filter is used to display the specified APP in a non-full screen size. Because an APP usually displays multiple activities in the unit of one task, therefore, the packageName filtering method is used.
2. M
1, the main process of Activity initiation:Click to view larger image2, the main process analysis:Activty, Instrumetation, Activitymanagerproxy "by Activitymanagernative Getdefault" – (RPC), AMSActivitythread, Class H (hander), Applicationthread, applicationthreadproxy– (RPC), AMS Instrumentation3, main class function introduction
Activitymanagerservices: A server-side object that is responsible for managing the lifecycle of all activity in the sy
subscribers (broadcast recipients)Ii. Message Publishers (broadcast publishers)Iii. Message Center (AMS, Activity Manager Service) Principle Description:I. The broadcast recipient is registered with the AMS through the binder mechanismII. Broadcast sender sends a broadcast to AMS via binder mechanismIii. AMS is looki
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The Activitymanagernative.getdefault () Gets the Iactivitymanager interface and invokes the StartActivity () method. is actually servicemanager.getservice ("activity"), that is, getting Activitymanagerservice (AMS) and the StartActivity () method of the Activitymanagerservice class is invoked remotely via binder.
private static final singleton
Iavitymanager provi
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