Android实时监听网络状态（1）

其实手机在网络方面的的监听也比较重要，有时候我们必须实时监控这个程序的实时网络状态，android在网络断开与连接的时候都会发出广播，我们通过接收系统的广播就可以实现网络的监听。

1、添加访问网络和获取网络状态的权限

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.INTERNET" />

2、新建一个Application类并继承android.app.Application 申明变量保存网络状态

package com.javen.application;



import com.javen.netbroadcast.NetUtil;





public class Application extends android.app.Application {

    private static Application mApplication;

    public static int mNetWorkState;



    public static synchronized Application getInstance() {

        return mApplication;

    }



    @Override

    public void onCreate() {

        super.onCreate();

        mApplication = this;

        initData();

    }







    public void initData() {

        mNetWorkState = NetUtil.getNetworkState(this);

    }

}

Application

 

3、新建NetBroadcastReceiver类继承BroadcastReceiver 并实现onReceive方法 在onReceive方法通知接口完成加载

package com.javen.receiver;



import java.util.ArrayList;



import com.javen.application.Application;

import com.javen.netbroadcast.NetUtil;





import android.content.BroadcastReceiver;

import android.content.Context;

import android.content.Intent;



public class NetBroadcastReceiver extends BroadcastReceiver {

    public static ArrayList<netEventHandler> mListeners = new ArrayList<netEventHandler>();

    private static String NET_CHANGE_ACTION = "android.net.conn.CONNECTIVITY_CHANGE";

    @Override

    public void onReceive(Context context, Intent intent) {

        if (intent.getAction().equals(NET_CHANGE_ACTION)) {

            Application.mNetWorkState = NetUtil.getNetworkState(context);

            if (mListeners.size() > 0)// 通知接口完成加载

                for (netEventHandler handler : mListeners) {

                    handler.onNetChange();

                }

        }

    }



    public static abstract interface netEventHandler {



        public abstract void onNetChange();

    }

}

View Code

4、在应该的Activity中实现netEventHandler接口 

package com.javen.netbroadcast;



import com.javen.receiver.NetBroadcastReceiver;

import com.javen.receiver.NetBroadcastReceiver.netEventHandler;

import com.javen.ui.base.BaseActivity;



import android.os.Bundle;

import android.view.Menu;



public class MainActivity extends BaseActivity implements netEventHandler{

    



    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        NetBroadcastReceiver.mListeners.add(this);

    }



    @Override

    public boolean onCreateOptionsMenu(Menu menu) {

        // Inflate the menu; this adds items to the action bar if it is present.

        getMenuInflater().inflate(R.menu.main, menu);

        return true;

    }



    @Override

    public void onNetChange() {

        // TODO Auto-generated method stub

        if (NetUtil.getNetworkState(this) == NetUtil.NETWORN_NONE) {

            T.showLong(this, R.string.net_err);

        }else {

            T.showLong(this, "网络可以使用");

        }

    }



}

5、判断网络的工具类

package com.javen.netbroadcast;



import android.content.Context;

import android.net.ConnectivityManager;

import android.net.NetworkInfo.State;



public class NetUtil {

    public static final int NETWORN_NONE = 0;

    public static final int NETWORN_WIFI = 1;

    public static final int NETWORN_MOBILE = 2;



    public static int getNetworkState(Context context) {

        ConnectivityManager connManager = (ConnectivityManager) context

                .getSystemService(Context.CONNECTIVITY_SERVICE);



        // Wifi

        State state = connManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI)

                .getState();

        if (state == State.CONNECTED || state == State.CONNECTING) {

            return NETWORN_WIFI;

        }



        // 3G

        state = connManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE)

                .getState();

        if (state == State.CONNECTED || state == State.CONNECTING) {

            return NETWORN_MOBILE;

        }

        return NETWORN_NONE;

    }

}

NetUtil