2013.11.28 ——— android 网络3g wifi切换

最新推荐文章于 2025-08-08 23:51:41 发布

cody123

最新推荐文章于 2025-08-08 23:51:41 发布

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文章标签：移动开发

本文链接：https://blog.youkuaiyun.com/cody123/article/details/84507668

本文介绍了如何在Android中监听网络状态变化，包括从WiFi到3G的切换，并通过示例代码展示了网络状态变化的处理逻辑。

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2013.11.28 ——— android 网络3g wifi切换

BroadcastReceiver


package com.example.testunicom;

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.wifi.WifiManager;

public class NetCheckReceiver{
    BaseBroadcast mReceiver;
    Context mContext;
    NetChangeFilter mFilter;

    NetCheckReceiver(Context context){
        this.mFilter = new NetChangeFilter(context);
    }

    public void register(Context context){
        mReceiver = new BaseBroadcast();
        IntentFilter filter = new IntentFilter();
        filter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);
        mContext = context;
        mContext.registerReceiver(mReceiver, filter);
    }
    public void unRegister(){
        mContext.unregisterReceiver(mReceiver);
    }

    private class BaseBroadcast extends BroadcastReceiver {
        @Override
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();
            if (action.equals(ConnectivityManager.CONNECTIVITY_ACTION)) {// 网络连接
                System.out.println("======================================");
                mFilter.netChange(context);
            }
        }
    }
}

NetChangeFilter


package com.example.testunicom;

import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;

public class NetChangeFilter {

    private NetworkInfo mOldNet;

    NetChangeFilter(Context context){
        this.mOldNet = UtilUnicom.getNetWorkInfo(context);
    }


    public void netChange(Context context){
        NetworkInfo tNet = UtilUnicom.getNetWorkInfo(context);

        if(mOldNet==null){
            if(tNet==null){
                System.out.println("null ————> null");
                return;
            }
            if(tNet.getType()==ConnectivityManager.TYPE_MOBILE){
                System.out.println("null ————> mobile");
            }else if(tNet.getType() == ConnectivityManager.TYPE_WIFI){
                System.out.println("null ————> wifi");
            }else{
                System.out.println("null ————> " + tNet.getTypeName());
            }
        }else {
            if(tNet==null){
                if(mOldNet.getType()==ConnectivityManager.TYPE_MOBILE){
                    System.out.println("mobile ————> null");
                }else if(mOldNet.getType() == ConnectivityManager.TYPE_WIFI){
                    System.out.println("wifi ————> null");
                }else{
                    System.out.println(mOldNet.getTypeName() + " ————> null");
                }
            }else{
                int tOld = mOldNet.getType();
                int tNew = tNet.getType();

                if(tOld!=tNew){
                    if(tOld==ConnectivityManager.TYPE_MOBILE && tNew==ConnectivityManager.TYPE_WIFI){
                        System.out.println("mobile ————> wifi");
                    }else if(tOld==ConnectivityManager.TYPE_WIFI && tNew==ConnectivityManager.TYPE_MOBILE){
                        System.out.println("wifi ————> mobile");
                    }else{
                        System.out.println(tOld + " ————> " + tNew);
                    }
                }else{
                    System.out.println("same===============" + mOldNet.getTypeName());
                }
            }
        }
        mOldNet = tNet;
    }

}

MainActivity


@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mContext = this;
        mNetReceiver = new NetCheckReceiver(mContext);
        mNetReceiver.register(mContext);
    }


@Override
    protected void onDestroy() {
        super.onDestroy();
        mNetReceiver.unRegister();
    }

测试如下：
1、wifi 3G都连着断掉wifi

启动程序
11-28 10:56:41.823: I/System.out(819): ======================================
11-28 10:56:41.823: I/System.out(819): same===============WIFI
断掉wifi
11-28 10:57:28.819: I/System.out(819): ======================================
11-28 10:57:28.819: I/System.out(819): wifi ————> null
11-28 10:57:34.354: I/System.out(819): ======================================
11-28 10:57:34.354: I/System.out(819): null ————> mobile

2、3G连着，打开wifi
启动程序
11-28 10:58:03.543: I/System.out(819): ======================================
11-28 10:58:03.553: I/System.out(819): same===============mobile
打开wifi
11-28 10:58:25.624: I/System.out(819): ======================================
11-28 10:58:25.624: I/System.out(819): mobile ————> wifi
11-28 10:58:26.775: I/System.out(819): ======================================
11-28 10:58:26.775: I/System.out(819): same===============WIFI
11-28 10:58:26.785: I/System.out(819): ======================================
11-28 10:58:26.785: I/System.out(819): same===============WIFI

3、wifi连着，断开wifi 打开3G
11-28 10:59:51.448: I/System.out(819): ======================================
11-28 10:59:51.448: I/System.out(819): same===============WIFI
断开wifi 同时打开3G
11-28 11:00:20.536: I/System.out(819): ======================================
11-28 11:00:20.536: I/System.out(819): wifi ————> null
11-28 11:00:26.022: I/System.out(819): ======================================
11-28 11:00:26.022: I/System.out(819): null ————> mobile

3、3G连着，断开3G 打开wifi
启动程序
11-28 11:01:32.797: I/System.out(819): ======================================
11-28 11:01:32.797: I/System.out(819): same===============mobile
断开3G 打开wifi
11-28 11:01:49.463: I/System.out(819): ======================================
11-28 11:01:49.473: I/System.out(819): mobile ————> null
11-28 11:01:57.871: I/System.out(819): ======================================
11-28 11:01:57.871: I/System.out(819): null ————> wifi

由上可见：
wifi——>3G 接收到2个广播
1、wifi ————> null 断开wifi
2、null ————> mobile 连接3G
3G——>Wifi 接收到了3个广播
1、mobile ————> wifi 连接到wifi
2、same===============WIFI 断开3G
3、same===============WIFI 连接wifi