Activities An Activity is an application component that provides a screen with which users can interact in order to do something, such as dial the phone, take a photo, send an email, or view a ma

Design Philosophy Android introduced fragments in Android 3.0(API level 11), primarily to support more dynamic and flexible UI designs on large screens, such as tablets. Because a tablet's screen

The weight value is a number that specifies the amount of remaining space each view should consume, relative to the amount consumed by sibling views. This works kind of like the amount of ingredients

Performing Fragment Transactions A great feature about using fragments in your activity is the ability to add, remove, replace, and perform other actions with them, in response to user interaction. E

The Manifest File Before the Android system can start an application component, the system must know that the component exists by reading the application's AndroidManifest.xml file(the "manifest" fil

Introduced in Android 3.0, loaders make it easy to asynchronosly load data in an activity or fragment. Loaders have these characteristics: *They are available to every Activity and Fragment. *They p

Even though the activities may be from different applications, Android maintains this seamless user experience by keeping both activities in the same task.

有关android 的strict mode 的问题。。。