NetUtils.java

package com.lfk.justweengine.utils.tools;

import android.app.Activity;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.location.LocationManager;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;

/**
 * 判断网络状态的工具类
 *
 * @author liufengkai
 */
public class NetUtils {

    private NetUtils() {
        /* cannot be instantiated */
        throw new UnsupportedOperationException("cannot be instantiated");
    }

    /**
     * 判断网络是否连接
     *
     * @param context
     * @return 是否已连接网络
     */
    public static boolean isConnected(Context context) {
        ConnectivityManager connectivity = (ConnectivityManager) context
                .getSystemService(Context.CONNECTIVITY_SERVICE);
        if (null != connectivity) {
            NetworkInfo info = connectivity.getActiveNetworkInfo();
            if (null != info && info.isConnected()) {
                if (info.getState() == NetworkInfo.State.CONNECTED) {
                    return true;
                }
            }
        }
        return false;
    }

    /**
     * 判断是否是wifi连接
     *
     * @param context
     * @return 是否连接Wi-Fi
     */
    public static boolean isWifi(Context context) {
        // 先判断是否连接
        if (!isConnected(context)) {
            return false;
        }
        ConnectivityManager cm = (ConnectivityManager) context
                .getSystemService(Context.CONNECTIVITY_SERVICE);

        if (cm == null)
            return false;
        return cm.getActiveNetworkInfo().getType() == ConnectivityManager.TYPE_WIFI;
    }

    /**
     * 打开网络设置界面
     *
     * @param activity
     */
    public static void openSetting(Activity activity) {
        Intent intent = new Intent("/");
        ComponentName cm = new ComponentName("com.android.settings",
                "com.android.settings.WirelessSettings");
        intent.setComponent(cm);
        intent.setAction("android.intent.action.VIEW");
        activity.startActivityForResult(intent, 0);
    }

    /**
     * 判断GPS是否打开
     *
     * @param context
     * @return
     */
    public static boolean isGpsEnabled(Context context) {
        LocationManager alm = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
        if (!alm.isProviderEnabled(LocationManager.GPS_PROVIDER)) {
            return false;
        }
        return true;
    }

}