Android监听网络状态变化，随着网络的变化做一些其他处理

用广播实现，我已经把这个作为一个同用的类了，只需要在需要监听网络变化的类里设置下监听回调即可。

以下是代码：

import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.net.ConnectivityManager;import android.net.NetworkInfo;import android.util.Log;import java.util.ArrayList;import java.util.List;/** * Created by Smile on 2016/9/26. */public class NetworkChange extends BroadcastReceiver {    public final int wifi = 2, mobile = 1, none = 0;    public int oldState = none;    public List<OnNetWorkChange> onNetWorkChange = new ArrayList<>();    private static NetworkChange networkChange;    public static NetworkChange getInstance() {        if (networkChange == null) {            networkChange = new NetworkChange();        }        return networkChange;    }    //回调接口    public interface OnNetWorkChange {        //返回各个（wifi,移动网络，没有网络）状态的值，上一个网络状态的值，当前的网络状态的值        void onChange(int wifi, int mobile, int none, int oldStatus, int newStatus);    }    /**     * 增加网络变化监听回调对象     * 如果设置多个回调，请务必不要设置相同名字的OnNetWorkChange对象，否则会无效     *     * @param onNetWorkChange 回调对象     */    public void setOnNetWorkChange(OnNetWorkChange onNetWorkChange) {        if (this.onNetWorkChange.contains(onNetWorkChange)) {            return;        }        this.onNetWorkChange.add(onNetWorkChange);        Log.i("网络状态", "添加一个回调。已设置：" + this.onNetWorkChange.size());    }    /**     * 取消网络变化监听监听回调     *     * @param onNetWorkChange 回调对象     */    public void delOnNetWorkChange(OnNetWorkChange onNetWorkChange) {        if (this.onNetWorkChange.contains(onNetWorkChange)) {            this.onNetWorkChange.remove(onNetWorkChange);            Log.i("网络状态", "删除一个回调。还有：" + this.onNetWorkChange.size());        }    }    /**     * 触发网络状态监听回调     *     * @param nowStatus 当前网络状态     */    private void setChange(int nowStatus) {        for (OnNetWorkChange change : onNetWorkChange) {            change.onChange(wifi, mobile, none, oldState, nowStatus);        }        oldState = nowStatus;    }    @Override    public void onReceive(Context context, Intent intent) {        ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);        NetworkInfo mobNetInfo = connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);        NetworkInfo wifiNetInfo = connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);        if (onNetWorkChange == null) {            //当没有设置回调的时候，什么都不做            return;        }        if (!mobNetInfo.isConnected() && !wifiNetInfo.isConnected()) {            Log.i("通知", "网络不可以用");            setChange(none);        } else if (mobNetInfo.isConnected()) {            Log.i("通知", "仅移动网络可用");            setChange(mobile);        } else if (wifiNetInfo.isConnected()) {            Log.i("通知", "Wifi网络可用");            setChange(wifi);        }    }}

这个广播类首先要注册下，推荐在Application类里注册：

IntentFilter filter = new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION);registerReceiver(NetworkChange.getInstance(), filter);

使用方法：

home_onChange对象名务必不能出现一样的，不然会导致无效。

    private NetworkChange.OnNetWorkChange home_onChange = new NetworkChange.OnNetWorkChange() {        @Override        public void onChange(int wifi, int mobile, int none, int oldStatus, int newStatus) {            if (newStatus == none){                //没有网络            }            if (newStatus == mobile){                //移动网络            }            if (newStatus == wifi){                //wifi网络                if (oldStatus == mobile) {                    //从移动网络切换到wifi网络                }            }        }    };    //注册监听网络变化    private void registerReceiver() {        NetworkChange.getInstance().setOnNetWorkChange(home_onChange);    }    //取消监听网络变化    private void unregisterReceiver() {        NetworkChange.getInstance().delOnNetWorkChange(home_onChange);    }

在onCreate里注册回调

NetworkChange.getInstance().setOnNetWorkChange(home_onChange);

在onDestroy里去掉回调

NetworkChange.getInstance().delOnNetWorkChange(home_onChange);