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Four loads of Activity model
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Four loading modes of activity:
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Android property system
4.0
Each property has a name and value, they are in string format. Properties are used in the Android system, used to record the system settings
Or exchange of information between processes. Properties are globally visible throughout the system. Each process can get/set properties.
During system initialization, Android will be assigned an area of shared memory to store properties. These are the "init" daemons are done with its source
Number is located: device/system/init. "Init" daemon will start a property services. Property services in the "init" daemon running.
Every client that you want to set properties, you must connect property services, and to send a message. Property services will be modified in a shared memory area, and
Create an attribute. Any client to obtain property information can be read directly from the shared memory. This improves read performance.
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