一、序言：

对于开发而言，最好把使用频繁使用的方法定义一个类，这样不仅能方便实用而且提示代码的可阅读性，在网上也有很多的工具类，这个 也就看个人开发所需，那我这里就添加一些我自己项目常用到的一些开发工具(本文章长期更新)，欢迎大家点赞收藏。

二、判断App是否在前台

    /**
     * 判断当前应用程序处于前台还是后台
     *
     * @param context
     * @return
     */
    public static boolean isApplicationBroughtToBackground(final Context context) {
        ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
        List<ActivityManager.RunningTaskInfo> tasks = am.getRunningTasks(1);
        if (!tasks.isEmpty()) {
            ComponentName topActivity = tasks.get(0).topActivity;
            return !topActivity.getPackageName().equals(context.getPackageName());
        }
        return false;
    }

三、判断手机是否有导航栏

 /**
     * 获取是否存在NavigationBar
     *
     * @param context
     * @return
     */
    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 && getVirtualBarHeight(context) > 0;
    }

四、获取虚拟导航栏高度

/**
     * 获取虚拟功能键高度
     *
     * @param context
     * @return
     */
    public static int getVirtualBarHeight(Context context) {
        int vh = 0;
        // 获取不可视视图高度,即非App显示面积高度
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
            Display display = windowManager.getDefaultDisplay();
            DisplayMetrics dm = new DisplayMetrics();
            try {
                @SuppressWarnings("rawtypes")
                Class c = Class.forName("android.view.Display");
                @SuppressWarnings("unchecked")
                Method method = c.getMethod("getRealMetrics", DisplayMetrics.class);
                method.invoke(display, dm);
                vh = dm.heightPixels - windowManager.getDefaultDisplay().getHeight();
            } catch (Exception e) {
                e.printStackTrace();
            }

        }
        // 判断是否有虚拟按键
        boolean hasMenuKey = ViewConfiguration.get(context)
                .hasPermanentMenuKey();
        boolean hasBackKey = KeyCharacterMap
                .deviceHasKey(KeyEvent.KEYCODE_BACK);
        if (hasMenuKey || hasBackKey) {
            // 80为状态栏高度
            if (vh > 80) {
                Resources res = context.getResources();
                int resourceId = res.getIdentifier("navigation_bar_height", "dimen", "android");
                if (resourceId > 0) {
                    vh = res.getDimensionPixelSize(resourceId);
                }
            } else {
                vh = 0;
            }

        }

        return vh;
    }

五、判断网络是否连接

    /**
     * 检查网络
     *
     * @return
     */
    public boolean isNetworkConnect(Context context) {
        boolean isWifi = false;
        boolean isMobile = false;
        ConnectivityManager connectivityManager;
        connectivityManager = (ConnectivityManager) context.getApplicationContext().getSystemService(Context.CONNECTIVITY_SERVICE);
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
            // 获取Wifi网络信息
            NetworkInfo wifiNetworkInfo = connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
            // 获取移动网络信息
            NetworkInfo mobileNetworkInfo = connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
            isWifi = wifiNetworkInfo.isConnected();
            isMobile = mobileNetworkInfo.isConnected();

        } else {
            // 获取所有的网络连接信息
            Network[] networks = connectivityManager.getAllNetworks();
            for (int j = 0; j < networks.length; j++) {
                NetworkInfo networkInfo = connectivityManager.getNetworkInfo(networks[j]);
                isWifi = networkInfo.getTypeName().equals("WIFI") && networkInfo.isConnected();
                isMobile = networkInfo.getTypeName().equals("MOBILE") && networkInfo.isConnected();
            }
        }
        return isWifi || isMobile;
    }

六、获取App版本号和版本名称

/**
     * 获取APP-VersionCode
     *
     * @param activity
     * @return
     */
    public static int GetAppVersionCode(Activity activity) {
        String pName = activity.getPackageName();
        int versionCode = 0;

        try {
            PackageInfo pinfo = activity.getPackageManager().getPackageInfo(
                    pName, PackageManager.GET_CONFIGURATIONS);
            versionCode = pinfo.versionCode;
        } catch (NameNotFoundException e) {
        }
        return versionCode;
    }

    /**
     * 获取APP-VersionName
     *
     * @param activity
     * @return
     */
    public static String GetAppVersionName(Activity activity) {
        String pName = activity.getPackageName();
        String versionName = "";

        try {
            PackageInfo pinfo = activity.getPackageManager().getPackageInfo(
                    pName, PackageManager.GET_CONFIGURATIONS);
            versionName = pinfo.versionName;
        } catch (NameNotFoundException e) {
        }
        return versionName;
    }