android 中 获取各种高度，控件，状态栏，底部导航栏

转载简书博主：差得很远呢 的文章
https://www.jianshu.com/p/c1f2a3849d6e

状态栏即statusBar，导航栏即某些手机底部有返回键的虚拟键那一栏，叫navigationBar。

1. 获取顶部statusBar高度

private int getStatusBarHeight() {
    Resources resources = mActivity.getResources();
    int resourceId = resources.getIdentifier("status_bar_height", "dimen","android");
    int height = resources.getDimensionPixelSize(resourceId);
    Log.v("dbw", "Status height:" + height);
    return height;
}

2. 获取底部navigationBar高度

private int getNavigationBarHeight() {
    Resources resources = mActivity.getResources();
    int resourceId = resources.getIdentifier("navigation_bar_height","dimen", "android");
    int height = resources.getDimensionPixelSize(resourceId);
    Log.v("dbw", "Navi height:" + height);
    return height;
}

3. 获取设备是否存在NavigationBar

//获取是否存在NavigationBar
    public static boolean checkDeviceHasNavigationBar(Context context) {
        boolean hasNavigationBar = false;
        Resources rs = context.getResources();
        int id = rs.getIdentifier("config_showNavigationBar", "bool", "android");
        if (id > 0) {
            hasNavigationBar = rs.getBoolean(id);
        }
        try {
            Class systemPropertiesClass = Class.forName("android.os.SystemProperties");
            Method m = systemPropertiesClass.getMethod("get", String.class);
            String navBarOverride = (String) m.invoke(systemPropertiesClass, "qemu.hw.mainkeys");
            if ("1".equals(navBarOverride)) {
                hasNavigationBar = false;
            } else if ("0".equals(navBarOverride)) {
                hasNavigationBar = true;
            }
        } catch (Exception e) {

        }
        return hasNavigationBar;

    }

4. 在页面未加载出来前，获取控件的宽高

    view.post(new Runnable() {
       @Override
        public void run() {
           int viewWidth = view.getWidth();//view宽度
                int viewHeight = view.getHeight();//view高度
            }
    });

5. 获取屏幕宽度

在页面未加载出来前，直接通过getWidth()获取的宽度为0，即使你在onResume()方法中执行这个方法也是一样。

    public static int getScreenWidth(Context context) {
        DisplayMetrics dm = context.getResources().getDisplayMetrics();
        return dm.widthPixels;
    }

6. 获取屏幕高度

    public static int getScreenHeight(Context context) {
        DisplayMetrics dm = context.getResources().getDisplayMetrics();
        return dm.heightPixels;
    }