android - 伴随对象 - Android 是否希望将它们注册为 Activity (?)

Question

我有一个 Activity

class DummyActivity : Activity() {

    companion object {
        @JvmStatic fun onNewIntent(context: Context): Intent {
            val intent = Intent(context, DummyActivity.javaClass)
            return intent
        }
    }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
    }
}

在Manifest中声明如下:

    <activity android:name=".DummyActivity"/>
</application>

当我尝试启动它时，我得到:

Caused by: android.content.ActivityNotFoundException: Unable to find explicit activity class > {com.example.andrzejzuzak.visiondummyapp/com.example.andrzejzuzak.visiondummyapp.DummyActivity$Companion}; have you declared this activity in your AndroidManifest.xml? at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1794) at android.app.Instrumentation.execStartActivity(Instrumentation.java:1512) at android.app.Activity.startActivityForResult(Activity.java:3930) at android.support.v4.app.BaseFragmentActivityJB.startActivityForResult(BaseFragmentActivityJB.java:50) at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:79) at android.app.Activity.startActivityForResult(Activity.java:3890) at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:859) at android.app.Activity.startActivity(Activity.java:4213) at android.app.Activity.startActivity(Activity.java:4181) at com.example.andrzejzuzak.visiondummyapp.MainActivity.onActivityResult(MainActivity.kt:85) at android.app.Activity.dispatchActivityResult(Activity.java:6456) at android.app.ActivityThread.deliverResults(ActivityThread.java:3695) at android.app.ActivityThread.handleSendResult(ActivityThread.java:3742)  at android.app.ActivityThread.-wrap16(ActivityThread.java)  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1393)  at android.os.Handler.dispatchMessage(Handler.java:102)  at android.os.Looper.loop(Looper.java:148)  at android.app.ActivityThread.main(ActivityThread.java:5417)  at java.lang.reflect.Method.invoke(Native Method)

困扰我的是这行:

Unable to find explicit activity class {com.example.andrzejzuzak.visiondummyapp/com.example.andrzejzuzak.visiondummyapp.DummyActivity$Companion

这是否真的意味着我必须在某处注册 Companion 对象？

Answer 1

DummyActivity.javaClass指DummyActivity.Companion而不是 DummyActivity .事实上，这甚至是一个警告:

The resulting type of this javaClass call is Class<Dummy.Companion> and not Class<Dummy>. Please use more clear ::class.java syntax to avoid confusion.

相反，您应该使用 DummyActivity::class.java ,