Android Process Communication --- Service Manager (1), android --- service
The Bind mechanism consists of four parts. Bind driver, Client, ServiceManager Service
1. Bind is actually a linux-based driver for Memory Sharing.
The bind driver is biased towards the kernel, and the content of the bind mechanism is very large, so we will skip this part temporarily.
2.
The process of software installation under Android:1: Copy xxx.apk to/data/app/xxx-1.apk2. Under the/data/data directory, create a folder folder name for the current application's package name.Directory structure of the Android project:Bin: Compiled file directoryGen: Auto-generated file directoryProject.Properties: Represents the version of the compiled version
@ bixiaopengtekimacbook-pro ~ $ ADB Shell
Shell @ Android:/$ su
Shell @ Android :/#
7. Run tcpdump
Perform packet capture analysis on the mobile phone
#/Data/local/tcpdump-p-VV-S 0-W/sdcard/capture. pcap
The value following got is increasing, indicating that the data packet is being captured.
8. packet capture interrupted
After the command is executed, run Ctrl + C in the Command Prompt window to interru
Significance:
Because each application process has its own independent process space, on the Android platform, a process usually does not access the memory space of another process, and we often need to boast process passing obje
Phone Dialer Development steps:1. Add the call permissions in the manifest file2. Call the core codeCreate a new Intent object Intent Intent_call = new Intent ();Add an action intent_call.setaction (Intent.action_call) for the intent object;Add Data Intent_call.setdata (Uri.parse ("Tel:" + phone number) for the intended object; Execution Intent StartActivity (Intent_call);Android Development process:
. The library is then generated and, as long as the specification operates, it can generate a library file that can make the Java layer successfully invoke.
Using NDK to compile the local language can refer to this blog post: http://blog.csdn.net/conowen/article/details/7522667
3. JNI Call Process
As we all know, Android application layer classes are written in Java, these Java classes are compiled into a
found:/usr/bin/ld: cannot find -lncursescollect2:ld1 exit statusmake: *** [out1Workaround:sudo apt-get install lib32ncurses5-devError found:dalvik/vm/native/dalvik_system_zygote.cpp: in function ' int setrlimitsfromarray (arrayobject*) ': dalvik/vm/native/dalvik_system_zygote.cpp:194 : Error:aggregate ' rlimit rlim ' has incomplete type and cannot be defineddalvik/vm/native/dalvik_system_ Zygote.cpp:217 : Error: ' Setrlimit ' was not Declared in this scopemake: * * * [out /host/ LIN
processrecord{308fb390 1713:system/1000} (fixed) nbsp; nbsp; APP nbsp;# 1:adj= N Bsp 0/0 processrecord{30908198 1794:android.process.acore/10005} (top-activity) nbsp; nbsp; PERS # 0:adj= -12/0 ProcessRec ord{3090d488 1789:xiao.xiong.test/10026} (fixed) copying code and ADJ=-12, this process starts immediately after DDMS manual stop nbsp; I am the king of the Tiger's split line nbsp; nbsp; nbsp; nbsp; nbsp; nbsp; nbsp; nbsp; nbsp; nbsp; nbsp; nbsp; nb
This issue is answered on stack over flow.Original link Address: http://stackoverflow.com/questions/27589844/android-studio-1-0-2-not-building-appmergedebugresources-errorWorkaround:// Run the following two instructions on the terminal respectively, install lib32stdc++6 and lib32z1sudo apt-get install lib32stdc++6sudo apt-get install Lib32z1Problem reason: Ubuntu can ' t run the AAPT on + bit before installing this packagesUbuntu under
Android mobile guard-md5 encryption process, android-md5
In the previous article, we stored the user's password using SharedPreferences, and opened/data/com. wuyudong. the config. import the xml file to the local device to view the content:
The password is in plain text, which is very insecure. Md5 encryption is used here
For more information, see http://www.cnb
Typical drawing process for 1.1.1 applications
We know that Bufferqueue has up to 32 bufferslot, so what is the purpose of this design? One possible reason is to improve graphics rendering speed. Because if there are only two buffers, imagine that when the output efficiency of the application producer is greater than the processing speed of the consumer, it will soon dequeue the buffer and be in the waiting state, causing unnecessary trouble. Of cour
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
. Android boot slow.Because the use of JNI,JVM causes the need to load many classes and class libraries, and the start of various services. For the user experience, Sureface is used.After starting the above start launcher, scanning each application information and so on.2. Android is developed for embedded products. In fact, the memory use effect is not ideal, prone to fragmentation, resulting in the use of
Hello EveryBody, it's time for us to get together again. Now we can't wait to summarize what we want to summarize today, because if we can't use it in practical applications, we can no longer listen to songs and send messages at the same time. In fact, we should all know that today's main character is process and multithreading. Well, if you don't talk about anything else, go to the topic.
I. Classification of An
notifies the system to stop the process. Note that in a normal (successful) completion process, the program that has been started is not stopped and the device status is the one that stays after the last event.
--monitor-native-crashes
Monitor and report the crashes of the native code in the
The principle of Android-don't need too much memory leftDon't worry about the size of the remaining memory. In fact, a lot of people are using other systems to bring the habit to come. Android most applications do not exit the design is actually reasonable, and the system on the process of the scheduling mechanism has a relationship. If you know Java, Can be clea
This article illustrates the detailed analysis of the process steps of the micro-letter SDK sharing function of Android programming. Share to everyone for your reference, specific as follows:
I've already analyzed how to share micro-information with official demos. Here I will no longer say, which about in their own application sharing is very simple, the author is also after a lot of toss to get success,
Android 5.0 kernel and source code learning (2)-source code download and system startup process analysis, android5.0
I,AndroidSource code download
The last time I briefly introduced the hierarchical structure of the Android system, I started to figure it out-download the source code and analyze the source code!
So where is the
In the previous section, we explained the local service. This section mainly describes remote service, which involves aidl. Okay, old rules. Let's start with the basic knowledge:
I. Basic Knowledge
Role of aidl On the Android platform, each application
Program All apps are running in their own process space. Generally, one process cannot access the memory
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