registerForActivityResult 的第一个参数 ActivityResultContracts 封装了很多常用的启动类型。不再需要调用者写不同 Activity 的启动代码。 使用 registerForActivityResult 之后也不需要再为 startActivityForResult 定义 requestCode。 ActivityResultContracts 有 14 个封装好的子类。 StartActivityForResult androidx.health.connect.client.impl.converters.datatype. Default Contracts. Getting a Result from Activity | Android startActivityForResult Example ... Set up Bluetooth | Android Developers How to use the Android Activity Result API for selecting and taking ... Activity Result API has been introduced in androidx.activity:activity and androidx.fragment:fragment modules. 听我说完，我用一个按钮打开一个活动，该活动生成一个项目，然后该项目将返回到原始片段，并显示在recyclerview中。. If the above code is placed in onCreate (Bundle savedInstanceState), the following exception is thrown: Exception: LifecycleOwner MyActivity@868498a is attempting to register while current state is RESUMED. ActivityResultContracts.CreateDocument An ActivityResultContract to prompt the user to select a path for creating a new document, returning the content:Uri of the item that was created. First, don't forget to add this to your Gradle dependency. ActivityResultLauncher returned from registerForActivityResult used to launch components, clearly defining the input parameter for desired results. kotlin - How do I append text to existing text file? - Stack Overflow Step 2: Working with the activity_main.xml. use #registerForActivityResult(ActivityResultContract, ActivityResultCallback) with the appropriate ActivityResultContract and handling the result in the ActivityResultCallback#onActivityResult(Object) callback. This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters. To give you a short introduction to the ActivityResult API, we will implement the mentioned example. The createIntent() method is used to create the valid Intent which will be passed in startActivityForResult() method once this contract is called. 1 Set up the project. Java answers related to "kotlin registerForActivityResult". [Android] 안드로이드 registerForActivityResult()란?(startActivityForResult ... 'startActivityForResult(android.content.Intent, int)' is deprecated 用途 Intentを作成して起動( startActivityForResult ) -> 結果を受け取るもの( onActivityResult )は今後これを使います。 使い方 ActivityやFragmentでとあるファイルをダウンロードして書き込みを行いたいとしたら、以下のようにします。 . Select Files in Android with Ease: Connecting SAF and ... - Holdapp 【Android】ActivityResultContractってなんだ - アプリ開発備忘録 Getting a result from an activity | Android Developers I mean the type of input and O means the type of output. Add following code in " activity_main.xml ". Activity.OnActivityResult(Int32, Result, Intent) Method (Android.App) registerForActivityResult で . // You can do the assignment inside onAttach or onCreate, i.e, before the activity is displayed ActivityResultLauncher<Intent> someActivityResultLauncher = registerForActivityResult ( new ActivityResultContracts.StartActivityForResult (), new ActivityResultCallback<ActivityResult> () { @Override public void onActivityResult .