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判断Android设备是否连接网络

/**
  * 判断Android客户端网络是否连接 
  * @param context
  * @return 真假
  */public static boolean checkNet(Context context) {   
           
        try {   
            ConnectivityManager connectivity = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);   
            if (connectivity != null) {   
               
                NetworkInfo info = connectivity.getActiveNetworkInfo();   
                if (info != null && info.isConnected()) {   
                   
                    if (info.getState() == NetworkInfo.State.CONNECTED) {   
                        return true;   
                    }   
                }   
            }   
        } catch (Exception e) {   
        return false;   
}   
        return false;   
    }  

以上代码只能判断是否有可用的连接,而不能判断是否能连网

* 检验网络连接 并toast提示
* 
* @return
*/
public boolean note_Intent(Context context) {
    ConnectivityManager con = (ConnectivityManager) context
        .getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo networkinfo = con.getActiveNetworkInfo();
    if (networkinfo == null || !networkinfo.isAvailable()) {
    // 当前网络不可用
        Toast.makeText(context.getApplicationContext(), "请先连接Internet!",
        Toast.LENGTH_SHORT).show();
        return false;
    }
    boolean wifi = con.getNetworkInfo(ConnectivityManager.TYPE_WIFI)
        .isConnectedOrConnecting();
    if (!wifi) { // 提示使用wifi
        Toast.makeText(context.getApplicationContext(), "建议您使用WIFI以减少流量!",
        Toast.LENGTH_SHORT).show();
    }
    return true;

}

android中判断网络连接是否可用

  • 判断网络连接是否可用
public static boolean isNetworkAvailable(Context context) {   
        ConnectivityManager cm = (ConnectivityManager) context   
                .getSystemService(Context.CONNECTIVITY_SERVICE);   
        if (cm == null) {   
        } else {
       //如果仅仅是用来判断网络连接
        //则可以使用 cm.getActiveNetworkInfo().isAvailable();  
            NetworkInfo[] info = cm.getAllNetworkInfo();   
            if (info != null) {   
                for (int i = 0; i < info.length; i++) {   
                    if (info[i].getState() == NetworkInfo.State.CONNECTED) {   
                        return true;   
                    }   
                }   
            }   
        }   
        return false;   
    } 
  • 判断GPS是否打开
public static boolean isGpsEnabled(Context context) {   
        LocationManager lm = ((LocationManager) context   
                .getSystemService(Context.LOCATION_SERVICE));   
        List<String> accessibleProviders = lm.getProviders(true);   
        return accessibleProviders != null && accessibleProviders.size() > 0;   
    } 
  • 判断WIFI是否打开
public static boolean isWifiEnabled(Context context) {   
        ConnectivityManager mgrConn = (ConnectivityManager) context   
                .getSystemService(Context.CONNECTIVITY_SERVICE);   
        TelephonyManager mgrTel = (TelephonyManager) context   
                .getSystemService(Context.TELEPHONY_SERVICE);   
        return ((mgrConn.getActiveNetworkInfo() != null && mgrConn   
                .getActiveNetworkInfo().getState() == NetworkInfo.State.CONNECTED) || mgrTel   
                .getNetworkType() == TelephonyManager.NETWORK_TYPE_UMTS);   
    }
  • 判断是否是3G网络
public static boolean is3rd(Context context) {   
        ConnectivityManager cm = (ConnectivityManager) context   
                .getSystemService(Context.CONNECTIVITY_SERVICE);   
        NetworkInfo networkINfo = cm.getActiveNetworkInfo();   
        if (networkINfo != null   
                && networkINfo.getType() == ConnectivityManager.TYPE_MOBILE) {   
            return true;   
        }   
        return false;   
    }  
  • 判断是wifi还是3g网络,用户的体现性在这里了,wifi就可以建议下载或者在线播放。
public static boolean isWifi(Context context) {   
            ConnectivityManager cm = (ConnectivityManager) context   
                    .getSystemService(Context.CONNECTIVITY_SERVICE);   
            NetworkInfo networkINfo = cm.getActiveNetworkInfo();   
            if (networkINfo != null   
                    && networkINfo.getType() == ConnectivityManager.TYPE_WIFI) {   
                return true;   
            }   
            return false;   
        }  
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