如何在android中从java实现Kotlin类？

我是一名Java/Kotlin新手，正在开发android应用程序。我尝试在YourApplication.kt中实现以下内容，我在这里发现：

我补充说

 ext.kotlin_version = '1.1.51'
 classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"

我的毕业剧本。我还将此添加到我的清单中：

         <activity android:name=".YourApplication"></activity>

但我得到了以下错误：

类“YourApplication”不是抽象的，并且不实现抽象成员公共抽象乐趣onActivityResumed（p0:Activity！）

我按照Android Studio的建议将其抽象化，但这导致了更多的错误

我还尝试按照AS的建议“实现成员”，但这会使我的应用程序在模拟器中崩溃

---

谢谢大家!

您的内部类，即AppLifecycleTracker类需要重写更多的几个方法

  import android.app.Activity
  android.app.Application
  import android.os.Bundle


/**
 * Created by saritha high 13/2/18.
 */
class AirventApplication : Application() {


    override fun onCreate() {
       super.onCreate()
       registerActivityLifecycleCallbacks(AppLifecycleTracker())
    }

  class AppLifecycleTracker : Application.ActivityLifecycleCallbacks {

      private var numStarted = 0

      override fun onActivityStarted(activity: Activity?) {
          if (numStarted == 0) {
              println("Activity has started");
          }
          numStarted++
      }

      override fun onActivityStopped(activity: Activity?) {
          numStarted--
          if (numStarted == 0) {
              println("Activity  has stopped");
          }
      }

      override fun onActivityPaused(p0: Activity?) {
        TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
       }

      override fun onActivityResumed(p0: Activity?) {
        TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
      }

      override fun onActivityDestroyed(p0: Activity?) {
        TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
      }

      override fun onActivitySaveInstanceState(p0: Activity?, p1: Bundle?)  {
        TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
      }

      override fun onActivityCreated(p0: Activity?, p1: Bundle?) {
        TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
      }
 }
}

并在清单中声明应用程序类，如：

  <application
    android:name=".YourApplication"
    android:icon="@mipmap/app_icon"
    android:label="@string/app_name"
    android:theme="@style/AppTheme">
    <activity
        android:name=".YourActivity"
        android:screenOrientation="portrait">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
   </application>

---

您的内部类，即AppLifecycleTracker类，需要重写更多的几个方法

  import android.app.Activity
  android.app.Application
  import android.os.Bundle


/**
 * Created by saritha high 13/2/18.
 */
class AirventApplication : Application() {


    override fun onCreate() {
       super.onCreate()
       registerActivityLifecycleCallbacks(AppLifecycleTracker())
    }

  class AppLifecycleTracker : Application.ActivityLifecycleCallbacks {

      private var numStarted = 0

      override fun onActivityStarted(activity: Activity?) {
          if (numStarted == 0) {
              println("Activity has started");
          }
          numStarted++
      }

      override fun onActivityStopped(activity: Activity?) {
          numStarted--
          if (numStarted == 0) {
              println("Activity  has stopped");
          }
      }

      override fun onActivityPaused(p0: Activity?) {
        TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
       }

      override fun onActivityResumed(p0: Activity?) {
        TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
      }

      override fun onActivityDestroyed(p0: Activity?) {
        TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
      }

      override fun onActivitySaveInstanceState(p0: Activity?, p1: Bundle?)  {
        TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
      }

      override fun onActivityCreated(p0: Activity?, p1: Bundle?) {
        TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
      }
 }
}

并在清单中声明应用程序类，如：

  <application
    android:name=".YourApplication"
    android:icon="@mipmap/app_icon"
    android:label="@string/app_name"
    android:theme="@style/AppTheme">
    <activity
        android:name=".YourActivity"
        android:screenOrientation="portrait">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
   </application>

您创建了应用程序类，但尝试将其作为活动。这是错误的。您到底需要什么，活动类还是应用程序类？您创建了应用程序类，但尝试将其作为活动。这是错误的。你到底需要什么，活动类还是应用类？谢谢你的回复，但我已经尝试过了（Android Studio建议），但它只会导致我的应用程序崩溃。不会向用户显示其他错误console@Rufus删除所有TODO函数调用，它将停止崩溃感谢回复，但我已经尝试过了（Android Studio建议），但它只会导致我的应用程序崩溃。不会向用户显示其他错误console@Rufus删除所有TODO函数调用，它将停止崩溃