Android网络连接状态查询及事件监听工具

 最近在项目中，需要检查终端的网络连接状态，及监听连接状态变化事件，一切都是为了给用户更好的体验，用户真正会关心的网络状态变化事件是“连接（Connected）”和“断开（Disconnected）”，其他事件是不应该被关注的（都是为了体验）。

    国内主要是两种网络，WIFI和GPRS，所以主要是对这两个网络进行查询，其他没考虑

    把工具代码贴一下，有需要的同学可以省点事儿，避免不必要的重复！

package org.dragonboy.net;    import android.content.BroadcastReceiver;  import android.content.Context;  import android.content.Intent;  import android.content.IntentFilter;  import android.net.ConnectivityManager;  import android.net.NetworkInfo;  import android.net.NetworkInfo.State;  import android.support.v4.net.ConnectivityManagerCompat;    /**   * @author dragonboyorg@qq.com   */  public class Connectivities {   private Connectivities() {   }     /**    * 检查当前WIFI是否连接，两层意思——是否连接，连接是不是WIFI    *     * @param context    * @return true表示当前网络处于连接状态，且是WIFI，否则返回false    */   public static boolean isWifiConnected(Context context) {    ConnectivityManager cm = (ConnectivityManager) context      .getSystemService(Context.CONNECTIVITY_SERVICE);    NetworkInfo info = cm.getActiveNetworkInfo();    if (info != null && info.isConnected()      && ConnectivityManager.TYPE_WIFI == info.getType()) {     return true;    }    return false;   }     /**    * 检查当前GPRS是否连接，两层意思——是否连接，连接是不是GPRS    *     * @param context    * @return true表示当前网络处于连接状态，且是GPRS，否则返回false    */   public static boolean isGprsConnected(Context context) {    ConnectivityManager cm = (ConnectivityManager) context      .getSystemService(Context.CONNECTIVITY_SERVICE);    NetworkInfo info = cm.getActiveNetworkInfo();    if (info != null && info.isConnected()      && ConnectivityManager.TYPE_MOBILE == info.getType()) {     return true;    }    return false;   }     /**    * 检查当前是否连接    *     * @param context    * @return true表示当前网络处于连接状态，否则返回false    */   public static boolean isConnected(Context context) {    ConnectivityManager cm = (ConnectivityManager) context      .getSystemService(Context.CONNECTIVITY_SERVICE);    NetworkInfo info = cm.getActiveNetworkInfo();    if (info != null && info.isConnected()) {     return true;    }    return false;   }     /**    * 对大数据传输时，需要调用该方法做出判断，如果流量敏感，应该提示用户    *     * @param context    * @return true表示流量敏感，false表示不敏感    */   public static boolean isActiveNetworkMetered(Context context) {    ConnectivityManager cm = (ConnectivityManager) context      .getSystemService(Context.CONNECTIVITY_SERVICE);    return ConnectivityManagerCompat.isActiveNetworkMetered(cm);   }     public static Intent registerReceiver(Context context,     ConnectivityChangeReceiver receiver) {    return context.registerReceiver(receiver,      ConnectivityChangeReceiver.FILTER);   }     public static void unregisterReceiver(Context context,     ConnectivityChangeReceiver receiver) {    context.unregisterReceiver(receiver);   }     public static abstract class ConnectivityChangeReceiver extends     BroadcastReceiver {    public static final IntentFilter FILTER = new IntentFilter(      ConnectivityManager.CONNECTIVITY_ACTION);      @Override    public final void onReceive(Context context, Intent intent) {     ConnectivityManager cm = (ConnectivityManager) context       .getSystemService(Context.CONNECTIVITY_SERVICE);     NetworkInfo wifiInfo = cm       .getNetworkInfo(ConnectivityManager.TYPE_WIFI);     NetworkInfo gprsInfo = cm       .getNetworkInfo(ConnectivityManager.TYPE_MOBILE);       // 判断是否是Connected事件     boolean wifiConnected = false;     boolean gprsConnected = false;     if (wifiInfo != null && wifiInfo.isConnected()) {      wifiConnected = true;     }     if (gprsInfo != null && gprsInfo.isConnected()) {      gprsConnected = true;     }     if (wifiConnected || gprsConnected) {      onConnected();      return;     }       // 判断是否是Disconnected事件，注意：处于中间状态的事件不上报给应用！上报会影响体验     boolean wifiDisconnected = false;     boolean gprsDisconnected = false;     if (wifiInfo == null || wifiInfo != null       && wifiInfo.getState() == State.DISCONNECTED) {      wifiDisconnected = true;     }     if (gprsInfo == null || gprsInfo != null       && gprsInfo.getState() == State.DISCONNECTED) {      gprsDisconnected = true;     }     if (wifiDisconnected && gprsDisconnected) {      onDisconnected();      return;     }    }      protected abstract void onDisconnected();      protected abstract void onConnected();   }  }