结合上面的答案，我有一个与旧方法兼容的方法startActivityForResult()保持使用requestCode而不改变旧的代码结构:

ActivityLauncher.class

public class ActivityLauncher {

private final ActivityResultLauncher<Intent> launcher;
private ActivityResultCallback<ActivityResult> activityResultCallback;

private ActivityLauncher(@NonNull ActivityResultCaller caller,
                         @NonNull ActivityResultContract<Intent, ActivityResult> contract,
                         @Nullable ActivityResultCallback<ActivityResult> activityResultCallback) {
    this.activityResultCallback = activityResultCallback;
    this.launcher = caller.registerForActivityResult(contract, this::onActivityResult);
}

public static ActivityLauncher registerActivityForResult(
        @NonNull ActivityResultCaller caller) {
    return new ActivityLauncher(caller, new ActivityResultContracts.StartActivityForResult(), null);
}

public void launch(Intent intent, @Nullable ActivityResultCallback<ActivityResult> activityResultCallback) {
    if (activityResultCallback != null) {
        this.activityResultCallback = activityResultCallback;
    }
    launcher.launch(intent);
}

private void onActivityResult(ActivityResult result) {
    if (activityResultCallback != null) activityResultCallback.onActivityResult(result);
}

public interface OnActivityResult {
    void onActivityResultCallback(int requestCode, int resultCode, Intent data);
}

}

在BaseActivity.java中代码

private final ActivityLauncher activityLauncher = ActivityLauncher.registerActivityForResult(this);

public void startActivityForResult(Intent intent, int requestCode, ActivityLauncher.OnActivityResult onActivityResult) {
    activityLauncher.launch(intent, result -> onActivityResult.onActivityResultCallback(requestCode, result.getResultCode(), result.getData()));
}

最后在每个扩展BaseActivity的Activity中，实现ActivityLauncher。将覆盖函数“OnActivityResult”的名称改为“onActivityResultCallback”。还记得删除super.onActivityResult()

如何使用:startActivityForResult(intent, requestCode, this)

ActivityResultLauncher<Intent> someActivityResultLauncher = registerForActivityResult(
        new ActivityResultContracts.StartActivityForResult(),
        new ActivityResultCallback<ActivityResult>() {
            @Override
            public void onActivityResult(ActivityResult result) {
                if (result.getResultCode() == Activity.RESULT_OK) {

                }
            }
        });

似乎onActivityResult在超类中已弃用，但你在你的问题中没有提到超类名称和compileSdkVersion。

在Java和Kotlin中，只要添加@Deprecated，每个类或方法都可以标记为deprecated，所以检查你的超类，你可能扩展了一个错误的类。

当一个类被弃用时，它的所有方法也被弃用。

要看到一个快速的解决方案，点击弃用的方法，并按Ctrl+Q在Android工作室查看方法的文档，应该有一个解决方案。

在我使用androidx和API 29作为compileSdkVersion的项目中，此方法在活动和片段中不弃用

如果您正在使用SMS同意API，则使用以下代码(Kotlin):

resultLauncher.launch( consentIntent
                            )

    var resultLauncher = registerForActivityResult(ActivityResultContracts.StartActivityForResult()) { result ->
    if (result.resultCode == Activity.RESULT_OK) {
        // There are no request codes
    //    val data: Intent? = result.data
        val message = result.data?.getStringExtra(SmsRetriever.EXTRA_SMS_MESSAGE)
        getOtpFromMessage(message)

    }
}

添加到muntashir akon和abhijeet的答案，你可以通过在意图中传递值来修改新格式，使其像旧格式一样工作，例如:

// calling class
....
val i = Intent(this@GEBShopActivity, BarcodeScannerActivity::class.java)
when(loadedFragment){   
   is ShopHomeFragment      -> { i.putExtra("myapp.result.code", CODE_ACTIVITY_SCAN_LIST_MAINT) }
   is ShopListFragment      -> { i.putExtra("myapp.result.code", CODE_ACTIVITY_SCAN_LIST_MAINT) }
   is ShopItemMaintFragment -> { i.putExtra("myapp.result.code", CODE_ACTIVITY_SCAN_ITEM_MAINT) }
   is ShopPriceFragment     -> { i.putExtra("myapp.result.code", CODE_ACTIVITY_PRICE_CAPTURE) }
   is ShopCompareFragment   -> { i.putExtra("myapp.result.code", CODE_ACTIVITY_PRICE_CAPTURE) }
}
shopFragmentLauncher.launch(i)
....

// called class
....
val resultIntent = Intent()
val bundle = Bundle()
bundle.putStringArrayList("scanned_barcodes", scanned_barcodes)
bundle.putInt("scan_count", scan_count)
resultIntent.putExtras(bundle)
resultIntent.putExtra("myapp.result.code", intent.getIntExtra("myapp.result.code", 0))
setResult(Activity.RESULT_OK, resultIntent)
....

这将允许您保持类的调用相同，只需要额外的一行来添加原始调用的结果代码。还允许您创建一个可重用的启动程序实例。

startActivityForResult和onActivityResult在android 10 API 30中已弃用，现在我们有了一种新的方法来使用registerForActivityResult来获得结果

resultContract =
    registerForActivityResult(ActivityResultContracts.StartActivityForResult()) { result ->
        if (result.resultCode == Activity.RESULT_OK) {
            // There are no request codes
            val country = result.data?.getParcelableExtra<Country>("Country")
            showLiveDemoDialogue(country)
        }
    }

并启动活动

val intent = Intent(this, CountriesListActivity::class.java)
        resultContract.launch(intent)

但你应该在呼叫发射前注册然后发射到你想去的任何地方。 否则，您将得到这个异常

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