Android网络连接判断

网络连接判断

android网络编程时常需要用到连接判断：

/**  * 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;       }  

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判断网络连接

* 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;}

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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;       } 

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