android - 初始化自定义接口侦听器以将数据从 Activity 传输到 Viewoager 片段

Question

我想将数据从活动传输到ViewPager2直接由 a 调用的片段。我已经看到有关使用 Intent 和 Fragment Bundle 的答案，但这些不符合我的需要，如果我在尝试时失败了，我会退回到那个

我有一个活动将数据传输到另一个活动，该活动打开 ViewPager 并在片段中显示数据。转移的原因是共享元素转换有效。

我尝试在 Activity 中初始化接口的侦听器，但它不起作用，我不知道我在做什么，初始化时我缺少什么？或者这是错误的道路？

 class StopwatchActivity : AppCompatActivity() {
  private lateinit var listener: StopwatchListener

 override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        binding = ActivityStopwatchBinding.inflate(layoutInflater)
        setContentView(binding.root)

        listener = context as StopwatchListener
...

    }
...
override fun onPause() {
        super.onPause()
        binding.apply {
            listener.getTheTime(
                textViewStopwatchMinutesActivity.text.toString(),
                textViewStopwatchSecondsActivity.text.toString(),
                textViewStopwatchMillisActivity.text.toString()
            )
        }
    }
...

interface StopwatchListener {
        fun getTheTime(min: String, sec: String, millis: String)
    }


    
}

这是错误

  Process: com.homeofficeprojects.countmyrepstoo, PID: 16466
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.homeofficeprojects.countmyrepstoo/com.homeofficeprojects.countmyrepstoo.StopwatchActivity}: kotlin.UninitializedPropertyAccessException: lateinit property context has not been initialized
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3449)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3601)
    at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:85)
    at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
    at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2066)
    at android.os.Handler.dispatchMessage(Handler.java:106)
    at android.os.Looper.loop(Looper.java:223)
    at android.app.ActivityThread.main(ActivityThread.java:7656)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)
 Caused by: kotlin.UninitializedPropertyAccessException: lateinit property context has not been initialized
    at com.homeofficeprojects.countmyrepstoo.StopwatchActivity.onCreate(StopwatchActivity.kt:49)
    at android.app.Activity.performCreate(Activity.java:7994)
    at android.app.Activity.performCreate(Activity.java:7978)
    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1309)
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3422)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3601) 
    at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:85) 
    at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135) 
    at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95) 
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2066) 
    at android.os.Handler.dispatchMessage(Handler.java:106) 
    at android.os.Looper.loop(Looper.java:223) 
    at android.app.ActivityThread.main(ActivityThread.java:7656) 
    at java.lang.reflect.Method.invoke(Native Method) 
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592) 
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947) 

标签： androidkotlinandroid-fragments