android type_error ai_generated true

java.lang.IllegalArgumentException: Can't convert value to Intent, class android.content.Intent is not a valid type

ID: android/activityresult-api-contract-mismatch

Also available as: JSON · Markdown · 中文
87%Fix Rate
82%Confidence
1Evidence
2024-06-20First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
AndroidX Activity 1.7.2 active — — —
Android 14 (API 34) active — — —
Kotlin 1.9.0 active — — —

Root Cause

ActivityResultContract expects a different input/output type than the one provided in registerForActivityResult.

generic

中文

ActivityResultContract 期望的输入/输出类型与 registerForActivityResult 中提供的不匹配。

Workarounds

  1. 90% success Ensure the contract matches the input type. For Intent, use ActivityResultContracts.StartActivityForResult() and pass Intent explicitly: registerForActivityResult(ActivityResultContracts.StartActivityForResult()) { result -> ... } 
    Ensure the contract matches the input type. For Intent, use ActivityResultContracts.StartActivityForResult() and pass Intent explicitly: registerForActivityResult(ActivityResultContracts.StartActivityForResult()) { result -> ... }
  2. 85% success If using custom contract, override createIntent correctly. Example: class CustomContract : ActivityResultContract<Uri, Boolean>() { override fun createIntent(context: Context, input: Uri) = Intent(Intent.ACTION_VIEW, input) } 
    If using custom contract, override createIntent correctly. Example: class CustomContract : ActivityResultContract<Uri, Boolean>() { override fun createIntent(context: Context, input: Uri) = Intent(Intent.ACTION_VIEW, input) }

中文步骤

  1. Ensure the contract matches the input type. For Intent, use ActivityResultContracts.StartActivityForResult() and pass Intent explicitly: registerForActivityResult(ActivityResultContracts.StartActivityForResult()) { result -> ... }
  2. If using custom contract, override createIntent correctly. Example: class CustomContract : ActivityResultContract<Uri, Boolean>() { override fun createIntent(context: Context, input: Uri) = Intent(Intent.ACTION_VIEW, input) }

Dead Ends

Common approaches that don't work:

  1. Use ActivityResultContracts.StartActivityForResult() without any type casting 80% fail

    Still throws same error if Input class is not Intent; contract requires explicit type conversion.

  2. Remove the contract entirely and use deprecated startActivityForResult 90% fail

    Deprecated and won't compile on targetSdk 34+; also breaks modern lifecycle handling.