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Agenda:首先做一个简单的概述：Android 为什么要有HAL层？为什么不能将这层接口写在内核空间中？我们知道，Linux内核源代码版权遵循GNU License，而Android源代码版权遵循Apache License，前者在发布产品时，必须公布源代码，而后者无须发布源代码。那么假如把HAL层和内核层整合在一起，就必须公开，这样就会损害厂家的利益，因为功能上的逻辑可是代表着这个公司的核心技术。所以就有了HAL层，这一层主要是功能上的逻辑实现，运行在用户空间。下面是与硬件抽象层相关的各个层的关系：首先在驱动上对硬件直接进行操作，但是这些操作都是最基本的，例如读写寄存器等等。而在HAL层 阅读全文
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转载：http://android.tgbus.com/Android/tutorial/201103/346236.shtml And http://blog.csdn.net/sunshine0592/article/details/7010778 Can answer your question. 阅读全文
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Overview:Fragment is one container that can be padding by the actual widgets in activity. It is a small activity, which has lifecycle mixed with the activity it is in.场景演示 : 切换到该Fragment11-29 14:26:35.095: D/AppListFragment(7649): onAttach11-29 14:26:35.095: D/AppListFragment(7649): onCreate11-29 14 阅读全文
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Android commands: "adb shell procrank " to check the memory used info of all processes. "adb shell dumpsys meminfo pid(process id)" to check the memory used info of some one process. 阅读全文
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self-defined AppWidget:If you need define your own appwidget, you need two steps:first: define your layout. In the res/layout folder define a .xml, in the xml file, describe the widget's face.second: define your widget code. Because others use your widget from a class. So you must define a .java 阅读全文
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see the Linke:http://www.cnblogs.com/alexjie/admin/Files.aspx Folder:UIrecordAndReplay.zip 阅读全文
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BackGroundWhen I learned how to invoke one object's callback function, I found that the callback has three category:First: in the local, who define one function in file, then give it to you, you get it and use it.Second: You can use the intent to past one object to the others, then the others ge 阅读全文
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aidl－－android interface define language.First use aidl define a file named .aidl in the class folder. In the aidl file, you should define your interface class which includes abstract methods. Then in your gen folder, there will automatically generate a .java file which has the same name with .aidl f 阅读全文
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