内存泄漏：非静态内部类持有Activity引用

问题现象

Activity销毁后仍被内部类（如Handler、Runnable）隐式持有，导致无法回收，频繁触发GC，引发OOM。

解决方案

• 使用静态内部类 + WeakReference

  class MyActivity : AppCompatActivity() {
      private class SafeHandler(activity: MyActivity) : Handler(Looper.getMainLooper()) {
          private val weakActivity = WeakReference(activity)
          
          override fun handleMessage(msg: Message) {
              weakActivity.get()?.run { updateUI() }
          }
      }
      private val handler = SafeHandler(this)
  }

• 借助Lifecycle-aware组件

• lifecycle.addObserver(object : DefaultLifecycleObserver {
      override fun onDestroy(owner: LifecycleOwner) {
          handler.removeCallbacksAndMessages(null)
      }
  })