Android framework Startup Process
As we all know, Android mobile phone system is essentially a Linux-based application, which uses the Linux system As the kernel. Therefore, the system starts two phases: Linux kernel startup and Android framework startup.Linux Kernel startup
1. Load the bootloaderWhen the Linux kernel
Android Development Environment article
I. Installation: Required Packages
Android requires the following system Packages:flex:This Lexical Analyzer generator is used to read a given input file F Or a description of a scanner to generate. Bison:this is a general-purpose parser generator. Gperf:this is a perfect hash function generator. Libesd0-dev:this Enlightened sound daemon (dev files) are used to mixes
First take a look at the entire process of using the Java language for Android applications from the source code to the installation package, which includes compilations, links, and signatures, as follows:
(1) using the AAPT tool to generate R.java files
You can create an automatically android project first by building an eclipse development environment, and
principals. In general, these trusted organizations have installed their root certificates on your device before the device leaves the factory. Therefore, the digital certificate can ensure that the public key in the digital certificate is indeed the owner of the certificate, or the certificate can be used to confirm the identity of the other party. Digital Certificates are mainly used to solve the security issue of public keys.To sum up, the general proces
After installing the CentOS 6.8 in the old notebook using the default source after installing the MySQL version is 5.1.*, the version is too old uninstall and then download the community version of NPM on the MySQL website to add the installation, and then start to prompt fail, and use MySQL- Uroot a Mysql.sock file issue occurred while connecting.Search on the Internet to try to solve all kinds of solutions are not successful, there is said to add permissions, there is said to delete the ib* fi
ObjectiveThere's a lot of interaction with WebView in the recent code, WebView is the browser control in Android, and here's how WebView overloads the Webviewclient class to control URL loading.
Using Webviewclientusing Webviewclinet is primarily to inherit the Webviewclient parent class, rewrite the methods as needed, and configure them in WebView, as shown in the sample code:
WebView = (WebView) Findviewbyid (R.id.webview);
Webview.set
3 from Import Monkeyrunner, Monkeydevice 4 device = monkeyrunner.waitforconnection ()5 Device.shell ("monkey-p Com.qihoo.linker-v")Like the above, but(1) There is a problem is a lot of pages, there will be a jump between the interface, this situation how to do monkey stress test it?Because I am in the process of testing, some randomly generated events should be able to click the Home button or the return key, which may cause the application to quit,
Processes in AndroidBy default, all component in the same application run under the same Linux process. When starting a component A, if component B already exists in the running state and A and B belong to the same application, then component A will run under the process where component B is located. Otherwise a new Linux process will be created for a.Developers
/base/policy/src/COM/Android/Internal/policy/impl/globalaction. java has a changeairplanemodesystemsetting (Boolean on) method, which writes settings based on whether the on value is true or false. system. putint (mcontext. getcontentresolver (), settings. system. airplane_mode_on, on? 1-0); then send the broadcast:
Intent intent = new Intent(Intent.ACTION_AIRPLANE_MODE_CHANGED); intent.addFlags(Intent.FLAG_RECEIVER_REPLACE_PENDING);
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
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
");Run_init_process ("/bin/sh ");. Otherwise, an error is returned.
Here, because our root file system starts from/linuxrc, I have to change itIf (execute_command ){Run_init_process ("/linuxrc ");Printk (kern_warning "failed to execute % S. Attempting""Defaults.../N", execute_command );}
Android file system initialization core init. c file Analysis
The init file we mentioned above is compiled by the
After setting environment variables, emulator of Version 1.1 can be started by entering emulator in the command line. However, in version 1.5, an AVD (Android Virtual Device) is added ), AVD is equivalent to a simulator, but you can use AVD to create Simulators Based on different versions, and then use the emulator-AVD avdname command to start different simulators. The following describes how to create AVD:
1. view the currently supported versions (
' restoreanyversion ' in package ' Android '
3
C:\Users\xxx\Desktop\D_XE5_Android_Browser\Android\Debug\HadesAndroidBrowser\AndroidManifest.xml:23: error: No resource identifier foundforattribute‘installLocation‘inpackage‘android‘
Oh, look at this I am really a head of two big AH.Helpless, had to search these
Android uses AIDL for inter-process communication
To enable applications to communicate with each other, Android provides an unique implementation of IPC (Inter Process Communication): AIDL (Android Interface Definition Language, android
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
the callback method. Sometimes the image resources also need to be added with borders, text, and other additional modifications, therefore, you need to process the image after it is loaded.
In addition, due to my ability limitations and time relationships, there are still many imperfections in this article. For example, I do not have a deep understanding of memory allocation for Android and fail to thoroug
perform the reboot of the system:
/* We only trust the Superuser with rebooting the system. *
/if (!capable (cap_sys_boot))
return-eperm;
Otherwise the permission error will be returned. The corresponding list of permissions in Include/linux/capability.h, the restart operation is 22.The magic number is then validated:
/* For safety, we require "magic" arguments. *
/if (magic1!= Linux_reboot_magic1 | |
(Magic2!= linux_r
This article analyzes how mediaplay calls opencore In the android multimedia framework from the perspective of code. I. Summary:
For the android Multimedia Framework, Google has implemented stagefright in Android 2.2, but opencore is retained;
In the new version 2.3, opencore was officially abandoned and stagefright was adopted. There are many articles on the
1. Introduction to Android Service
Android services include Android services and native services.
Android service, also known as Java service, is a server implemented in the framework layer. Android service is written in Java.
Native service, also known as system service, is
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