android虚拟按键NavigationBar的判断

下面方法可判断手机是否有虚拟按键功能：

  public boolean hasNavigationBarFun(Activity activity) {        Resources rs = activity.getResources();        int id = rs.getIdentifier("config_showNavigationBar", "bool", "android");        boolean hasNavBarFun = false;        if (id > 0) {            hasNavBarFun = 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)) {                hasNavBarFun = false;            } else if ("0".equals(navBarOverride)) {                hasNavBarFun = true;            }        } catch (Exception e) {            hasNavBarFun = false;        }        return hasNavBarFun;    }

检查在有虚拟按键的设备上面，虚拟按键是否展示出来（收起或展示）

public boolean isNavigationBarShow(Activity activity){        DisplayMetrics dm = new DisplayMetrics();        Display display = activity.getWindowManager().getDefaultDisplay();        display.getMetrics(dm);        int screenHeight = dm.heightPixels;        DisplayMetrics realDisplayMetrics = new DisplayMetrics();        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {            display.getRealMetrics(realDisplayMetrics);        } else {            Class c;            try {                c = Class.forName("android.view.Display");                Method method = c.getMethod("getRealMetrics", DisplayMetrics.class);                method.invoke(display, realDisplayMetrics);            } catch (Exception e) {                realDisplayMetrics.setToDefaults();                e.printStackTrace();            }        }        int screenRealHeight = realDisplayMetrics.heightPixels;        return (screenRealHeight - screenHeight) > 0; }

而要监听虚拟按键的展示收起和展示，可以在需要监听的页面为最外面的View在onResume()时添加mContainer.getViewTreeObserver().addOnGlobalLayoutListener(this);
在onPause()时移除mContainer.getViewTreeObserver().removeGlobalOnLayoutListener(this);
在onGlobalLayout() 中调用checkDeviceHasNavigationBar来检查从而进行判断。

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