Activity to Fragment Android

As a user navigates through out of and back to your app the Activity instances in your app transition through different states in their lifecycle. With the release of Android 50 Lollipop the new material.

Android Fragment Life Cycle Fragments Android Life Cycles

For accessing a function declared in your Activity via your fragment please use an interface as shown in the answer by marco.

. Activity Result APIComponentActivity 现在提供了一个 ActivityResultRegistry让您无需替换 Activity 或 Fragment 中的方法即可处理 startActivityForResultonActivityResult 以及 requestPermissionsonRequestPermissionsResult 流程通过 ActivityResultContract 提高了类型安全性并提供了用于. For accessing a function declared in your Fragment via your activity you can use this if you dont have a tag or an id. Also you should never call new on an Activity as that is not the proper way to start one.

Parent activity meta-data to support API level 4 -- androidnameandroidsupportPARENT_ACTIVITY androidvaluecomexampleappMainActivity For more information about declaring the parent activity to support Up navigation read Providing Up Navigation. If you want to start a new instance of mFragmentFavorite you can do so via an Intent. MFragmentFavorite in your code is a FragmentActivity which is not the same thing as a FragmentThats why youre getting the type mismatch.

In Common Navigation Paradigms cliffnotes we discuss the various navigational structures available within Android apps. Intent intent new. One of the most flexible is the Navigation DrawerDuring the IO Conference 2015 Google released NavigationView which makes it far easier to create it than the previously documented instructions.

The Activity class provides a number of callbacks that allow the activity to know that a state has changed. That the system is creating stopping or resuming an activity or destroying the process in which the activity resides.

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