import ohos.aafwk.ability.AbilitySlice;
import ohos.agp.components.ComponentTreeObserver;

public class MyAbilitySlice extends AbilitySlice {
    @Override
    public void onStart(Intent intent) {
        super.onStart(intent);

        // 获取当前界面的 ComponentTreeObserver
        ComponentTreeObserver observer = getComponentTreeObserver();

        // 添加窗口焦点更新监听器
        observer.addWindowFocusUpdatedListener(new MyWindowFocusUpdatedListener());
    }

    // 自定义的窗口焦点更新监听器类
    private class MyWindowFocusUpdatedListener implements ComponentTreeObserver.WindowFocusUpdatedListener {
        @Override
        public void onWindowFocusUpdated(boolean hasFocus) {
            // 处理窗口焦点变化的逻辑
            // 这个方法会在窗口焦点状态发生变化时被调用
            if (hasFocus) {
                // 窗口获得焦点
            } else {
                // 窗口失去焦点
            }
        }
    }
}