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

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);
}
}

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)// 通知接口完成加載
for (netEventHandler handler : mListeners) {
handler.onNetChange();
}
}
}
public static abstract interface netEventHandler {
public abstract void onNetChange();
}
}

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, "網(wǎng)絡(luò)可以使用");
}
}
}

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;
}
}