Android全面屏适配与判断超详细讲解

<meta-data android:name="android.max_aspect"  
           android:value="ratio_float"/>

 <meta-data
            android:name="android.max_aspect"
            android:value="2.1" />

/**
     * 判断设备是否存在NavigationBar(虚拟导航栏)
     *
     * @return true 存在, false 不存在
     */
    public static boolean deviceHasNavigationBar() {
        boolean haveNav = false;
        try {
            //1.通过WindowManagerGlobal获取windowManagerService
            // 反射方法：IWindowManager windowManagerService = WindowManagerGlobal.getWindowManagerService();
            Class<?> windowManagerGlobalClass = Class.forName("android.view.WindowManagerGlobal");
            Method getWmServiceMethod = windowManagerGlobalClass.getDeclaredMethod("getWindowManagerService");
            getWmServiceMethod.setAccessible(true);
            //getWindowManagerService是静态方法，所以invoke null
            Object iWindowManager = getWmServiceMethod.invoke(null);
            //2.获取windowMangerService的hasNavigationBar方法返回值
            // 反射方法：haveNav = windowManagerService.hasNavigationBar();
            Class<?> iWindowManagerClass = iWindowManager.getClass();
            Method hasNavBarMethod = iWindowManagerClass.getDeclaredMethod("hasNavigationBar");
            hasNavBarMethod.setAccessible(true);
            haveNav = (Boolean) hasNavBarMethod.invoke(iWindowManager);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return haveNav;
    }

 /**
     * 判断是否是全面屏
     */
    private volatile static boolean mHasCheckAllScreen;
    private volatile static boolean mIsAllScreenDevice;
    public static boolean isAllScreenDevice(Context context) {
        if (mHasCheckAllScreen) {
            return mIsAllScreenDevice;
        }
        mHasCheckAllScreen = true;
        mIsAllScreenDevice = false;
        // 低于 API 21的，都不会是全面屏。。。
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
            return false;
        }
        WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
        if (windowManager != null) {
            Display display = windowManager.getDefaultDisplay();
            Point point = new Point();
            display.getRealSize(point);
            float width, height;
            if (point.x < point.y) {
                width = point.x;
                height = point.y;
            } else {
                width = point.y;
                height = point.x;
            }
            if (height / width >= 1.97f) {
                mIsAllScreenDevice = true;
            }
        }
        return mIsAllScreenDevice;
    }

  /**
     * 判断全面屏是否启用虚拟键盘
     */
    private static final String NAVIGATION = "navigationBarBackground";
    public static boolean isNavigationBarExist(@NonNull Activity activity) {
        ViewGroup vp = (ViewGroup) activity.getWindow().getDecorView();
        if (vp != null) {
            for (int i = 0; i < vp.getChildCount(); i++) {
                vp.getChildAt(i).getContext().getPackageName();
               
                if (vp.getChildAt(i).getId()!=-1&& NAVIGATION.equals(activity.getResources().getResourceEntryName(vp.getChildAt(i).getId()))) {
                    return true;
                }
            }
        }
        return false;
    }

  //设置底部导航栏颜色
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            getWindow().setNavigationBarColor(ContextCompat.getColor(this, R.color.white));
        }