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This article mainly introduces what are the startup modes of Activity in Android. It is very detailed and has a certain reference value. Interested friends must finish reading it!

Startup mode of Activity

Standard: each time Activity is activated (startActivity), an instance of Activity is created and placed on the task stack

SingleTop: if an Activity activates itself, that is, the Activity is at the top of the task stack, you do not need to create it. In other cases, you need to create an Activity instance.

SingleTask: if the Activity you want to activate has this instance in the task stack, you don't need to create it, just put the Activity at the top of the stack, that is, pop all the Activity instances above the Activity and call its onNewIntent.

SingleInstance: a MainActivity instance has been created in the task stack of App 1. If App 2 also wants to activate MainActivity, there is no need to create it. The two applications share the Activity instance.

4. The value passed between Activity and Fragment

Through findFragmentByTag or getActivity to get each other's reference (strong turn), and then call each other's public method, but to do so is to introduce a "strong turn" of the ugly code, the other two classes hold each other's strong reference, the coupling is large, easy to cause memory leaks.

Pass the value through the method of Bundle, such as the following code:

/ / set some parameters fragment.setArguments (bundle) for fragment in Activity; / / get the method Bundle arguments = getArguments () in Activity through getArguments in fragment

3. Using eventbus for communication, this method has high real-time performance, and the Activity and Fragment can be completely decoupled.

The code in / / Activity is EventBus.getDefault (). Post ("message"); / / the code in Fragment is EventBus.getDefault (). Register (this); @ Subscribe public void test (String text) {tv_test.setText (text);} above is all the content of the article "what are the startup modes of Activity in Android". Thank you for reading! Hope to share the content to help you, more related knowledge, welcome to follow the industry information channel!

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