android判断网络连接状态

    /**     * 检测网络状态     * http://www.cnblogs.com/qingblog/archive/2012/07/19/2598983.html     * @return     */    public boolean hasIntener() {        ConnectivityManager cm = (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE);        NetworkInfo networkInfo = cm.getActiveNetworkInfo();        if(networkInfo != null) {            return networkInfo.isAvailable();        }        return false;    }    /**     * 检测wifi状态     * @return     */    public boolean checkWifi() {        ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE);        NetworkInfo networkInfo = connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);        if(networkInfo != null) {            return networkInfo.isAvailable();        }        return false;    }    /**     * 检测GPRS连接是否可用     * @return     */    public boolean checkMobile() {        ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE);        NetworkInfo networkInfo = connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);        if(networkInfo != null) {            return networkInfo.isAvailable();        }        return false;    }    /**     * 获取当前的网络状态 -1：没有网络 1：WIFI网络2：wap网络3：net网络     * @return     */    public int getNetworkType() {        ConnectivityManager cm = (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE);        NetworkInfo networkInfo = cm.getActiveNetworkInfo();        if(networkInfo != null && networkInfo.isAvailable()) {            if(networkInfo.getType() == ConnectivityManager.TYPE_WIFI) {              return NET_WIFI;            }else {                switch (networkInfo.getSubtype()) {                    case TelephonyManager.NETWORK_TYPE_CDMA:                    case TelephonyManager.NETWORK_TYPE_GPRS:                    case TelephonyManager.NETWORK_TYPE_EDGE:                    case TelephonyManager.NETWORK_TYPE_1xRTT:                    case TelephonyManager.NETWORK_TYPE_IDEN:                        NetType = NET_2G;                        break;                    case TelephonyManager.NETWORK_TYPE_UMTS:                    case TelephonyManager.NETWORK_TYPE_HSDPA:                    case TelephonyManager.NETWORK_TYPE_EVDO_0:                    case TelephonyManager.NETWORK_TYPE_EVDO_A:                    case TelephonyManager.NETWORK_TYPE_EVDO_B:                    case TelephonyManager.NETWORK_TYPE_HSPA:                    case TelephonyManager.NETWORK_TYPE_EHRPD:                    case TelephonyManager.NETWORK_TYPE_HSPAP:                    case TelephonyManager.NETWORK_TYPE_LTE:                        NetType = NET_3G;                        break;                    case TelephonyManager.NETWORK_TYPE_UNKNOWN:                    default:                        NetType = NET_2G;                        break;                }            }            return NetType;        }        return -1;    }    /**     * 设置网络     * @param context     */    public void setNet(final Context context) {        //提示对话框        AlertDialog.Builder builder=new AlertDialog.Builder(context);        builder.setTitle("网络设置提示").setMessage("网络连接不可用,是否进行设置?").setPositiveButton("设置", new DialogInterface.OnClickListener() {            @Override            public void onClick(DialogInterface dialog, int which) {                // TODO Auto-generated method stub                Intent intent=null;                //判断手机系统的版本  即API大于10 就是3.0或以上版本                if(android.os.Build.VERSION.SDK_INT>10){                    intent = new Intent(android.provider.Settings.ACTION_WIRELESS_SETTINGS);                }else{                    intent = new Intent();                    ComponentName component = new ComponentName("com.android.settings","com.android.settings.WirelessSettings");                    intent.setComponent(component);                    intent.setAction("android.intent.action.VIEW");                }                context.startActivity(intent);            }        }).setNegativeButton("取消", new DialogInterface.OnClickListener() {            @Override            public void onClick(DialogInterface dialog, int which) {                dialog.dismiss();            }        }).show();    }
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