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▍Android property system

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 initi...

▍Four loads of Activity model

Four loads of Activity model: 1、Standard： ActivityA 2、SingleTop： ActivityA launchmode: SingleTop ; ActivityB launchmode :Standard 3、SingleTask： ActivityA launchmode: SingleTask; ActivityB launchmode : SingleTask 4、SingleInstance： ActivityA launch...