如何在 Spinner 中保持沉浸式模式？

Question

我使用沉浸式粘性模式隐藏导航栏和操作栏：

@TargetApi(19)
private void setImmersiveMode() {
    if (Build.VERSION.SDK_INT >= 19) {
        View decorView = getWindow().getDecorView();
        int uiOptions = getImmersiveUiOptions(decorView);
        decorView.setSystemUiVisibility(uiOptions);
        ActionBar actionBar = getActionBar();
        if (null!=actionBar) {
            actionBar.hide();
        }
    }
}

触摸Spinner 时，会显示navigationBar 并禁用沉浸式模式。

This solution 适用于对话框：

dialog.getWindow().setFlags(WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE, WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE);
dialog.show();
dialog.getWindow().getDecorView().setSystemUiVisibility(
context.getWindow().getDecorView().getSystemUiVisibility());
dialog.getWindow().clearFlags(WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE);

但是Spinner 没有我可以覆盖的show() 方法。

如何防止在触摸 Spinner 时显示系统 UI？

编辑：这个问题是关于隐藏导航栏（BackButton、HomeButton 和RecentTasksButton）。我已经在使用FLAG_FULLSCREEN

getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);   

Answer 1

我知道这已经很晚了，但我终于找到了解决这个here的方法：

在使用前在你的微调器上调用它：

import android.widget.PopupWindow
import android.widget.Spinner

fun Spinner.avoidDropdownFocus() {
    try {
        val isAppCompat = this is androidx.appcompat.widget.AppCompatSpinner
        val spinnerClass = if (isAppCompat) androidx.appcompat.widget.AppCompatSpinner::class.java else Spinner::class.java
        val popupWindowClass = if (isAppCompat) androidx.appcompat.widget.ListPopupWindow::class.java else android.widget.ListPopupWindow::class.java

        val listPopup = spinnerClass
                .getDeclaredField("mPopup")
                .apply { isAccessible = true }
                .get(this)
        if (popupWindowClass.isInstance(listPopup)) {
            val popup = popupWindowClass
                    .getDeclaredField("mPopup")
                    .apply { isAccessible = true }
                    .get(listPopup)
            if (popup is PopupWindow) {
                popup.isFocusable = false
            }
        }
    } catch (e: Exception) {
        e.printStackTrace()
    }
}

Answer 2

对于像我一样将开始将@Quinn 粘贴的解决方案从 Kotlin 重写到 Java 的每个人，后来他们会发现 the linked git repo 也是 Java 中的解决方案，我将其粘贴在这里：

import android.widget.ListPopupWindow;
import android.widget.PopupWindow;
import android.widget.Spinner;

public static void avoidSpinnerDropdownFocus(Spinner spinner) {
    try {
        Field listPopupField = Spinner.class.getDeclaredField("mPopup");
        listPopupField.setAccessible(true);
        Object listPopup = listPopupField.get(spinner);
        if (listPopup instanceof ListPopupWindow) {
            Field popupField = ListPopupWindow.class.getDeclaredField("mPopup");
            popupField.setAccessible(true);
            Object popup = popupField.get((ListPopupWindow) listPopup);
            if (popup instanceof PopupWindow) {
                ((PopupWindow) popup).setFocusable(false);
            }
        }
    } catch (NoSuchFieldException e) {
        e.printStackTrace();
    } catch (IllegalAccessException e) {
        e.printStackTrace();
    }
}