register while current state is RESUMED. LifecycleOwners must call register before they are STARTED.

错误信息：

LifecycleOwner xx is attempting to register while current state is RESUMED. LifecycleOwners must call register before they are STARTED.

意思就是registerForActivityResult必须在生命周期STARTED之前调用

错误代码示例：

override fun onCreate(savedInstanceState: Bundle?) {super.onCreate(savedInstanceState)setContentView(R.layout.activity_main)findViewById<Button>(R.id.float_bth).setOnClickListener {val registerForActivityResult =registerForActivityResult(ActivityResultContracts.StartActivityForResult()) {// ...}registerForActivityResult.launch(intent)}}

注意：上面代码中将registerForActivityResult的创建设置在了点击事件的内部，而此时的APP状态是RESUMED

解决：将registerForActivityResult的创建移动到onCreate()中去

override fun onCreate(savedInstanceState: Bundle?) {super.onCreate(savedInstanceState)setContentView(R.layout.activity_main)val registerForActivityResult =registerForActivityResult(ActivityResultContracts.StartActivityForResult()) {// ...}findViewById<Button>(R.id.float_bth).setOnClickListener {registerForActivityResult.launch(intent)}
}

另外：如果使用fragment，需要设置在fragment的onCreate()中

参考：

How to resolve the error “LifecycleOwners must call register before they are STARTED”

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register while current state is RESUMED. LifecycleOwners must call register before they are STARTED.

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