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();
}
}
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