全面屏手势导航栏适配

背景

识别是否全面屏手势场景，然后识别手势指示条是否显示，然后再获取指示条高度

由于全面屏手势是Android9开始出现的，所以验证需要从Android9的机型测到最新的15看时机效果。

是否全面屏手势判断

    public static boolean isGestureNavMode(Context context) {
        if (null == context) {
            return false;
        }
        if (Build.VERSION.SDK_INT >= 31) {
            int navMode = Settings.Secure.getInt(context.getContentResolver(), "hide_navigationbar_enable", 0);
            return navMode == 2 || navMode == 3;
        } else {
            return Settings.Secure.getInt(context.getContentResolver(), "navigation_mode", 0) == 2;
        }
    }

导航栏高度获取

public static int getNavBarHeightRes(Context context) {
        int navbarHeight = 0;
        try {
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
                int resourceId = context.getResources().getIdentifier("navigation_bar_height", "dimen", "android");
                if (resourceId > 0) {
                    navbarHeight = context.getResources().getDimensionPixelSize(resourceId);
                }
            } else {
                Class<?> clazz = Class.forName("com.android.internal.R$dimen");
                Object obj = clazz.newInstance();
                Field field = clazz.getField("navigation_bar_height");
                int height = Integer.parseInt(field.get(obj).toString());
                navbarHeight = context.getResources().getDimensionPixelSize(height);
            }
        } catch (Exception var5) {
            Log.w(TAG, "getNavBarHeightRes", var5);
        }
        Log.d(TAG, "navbarHeight=" + navbarHeight);
        return navbarHeight;
    }

通过onApplyWindowInsets监听当前的指示条的可见性

mRootLayout.setOnApplyWindowInsetsListener(new View.OnApplyWindowInsetsListener() {
                @Override
                public WindowInsets onApplyWindowInsets(View v, WindowInsets insets) {
                    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
                        boolean isNavBarVisible = insets.isVisible(WindowInsets.Type.navigationBars());
                        Log.d(TAG, isNavBarVisible + "  isNavBarVisible  ");
                    }
                    return insets;
                }
            });

是否显示状态栏(顺带mark)

这里的代码片段是在检查Activity的窗口是否设置了FLAG_KEEP_SCREEN_ON标志。
true：全屏，当前activity没有显示状态栏 false：有状态栏

int flag = activity.getWindow().getAttributes().flags;
boolean result = (flag & WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON) != 0;