其实浏览器的网络监听和处理不过是通知给WebView进行, 没有那么多复杂的操作, 使用了NetworkStateHandler这个类来进行处理
在Controller中初始化这个类
mNetworkHandler = new NetworkStateHandler(mActivity, this); //网络变化监听
/**
* Handle network state changes
* 处理网络变化
*/
public class NetworkStateHandler {
Activity mActivity;
Controller mController;
// monitor platform changes
private IntentFilter mNetworkStateChangedFilter;
private BroadcastReceiver mNetworkStateIntentReceiver;
private boolean mIsNetworkUp;
public NetworkStateHandler(Activity activity, Controller controller) {
mActivity = activity;
mController = controller;
// Find out if the network is currently up.
ConnectivityManager cm = (ConnectivityManager) mActivity
.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo info = cm.getActiveNetworkInfo();
if (info != null) {
mIsNetworkUp = info.isAvailable(); //是否可以连接网络
}
/*
* enables registration for changes in network status from http stack
* 网络变化监听的filter 和receiver
*/
mNetworkStateChangedFilter = new IntentFilter();
mNetworkStateChangedFilter.addAction(
ConnectivityManager.CONNECTIVITY_ACTION);
mNetworkStateIntentReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
if (intent.getAction().equals(
ConnectivityManager.CONNECTIVITY_ACTION)) {
NetworkInfo info = intent.getParcelableExtra(
ConnectivityManager.EXTRA_NETWORK_INFO);
String typeName = info.getTypeName(); //获取网络类型是wifi还是mobile
String subtypeName = info.getSubtypeName();//hspa 之类
sendNetworkType(typeName.toLowerCase(),
(subtypeName != null ? subtypeName.toLowerCase() : ""));
//网络是否连通
boolean noConnection = intent.getBooleanExtra(
ConnectivityManager.EXTRA_NO_CONNECTIVITY, false);
onNetworkToggle(!noConnection);
}
}
};
}
void onPause() { //在pause中解注册
// unregister network state listener
mActivity.unregisterReceiver(mNetworkStateIntentReceiver);
}
void onResume() {//在resume中注册
mActivity.registerReceiver(mNetworkStateIntentReceiver,
mNetworkStateChangedFilter);
}
/**
* connectivity manager says net has come or gone... inform the user
* @param up true if net has come up, false if net has gone down
*/
void onNetworkToggle(boolean up) {
if (up == mIsNetworkUp) {
return;
}
mIsNetworkUp = up;
WebView w = mController.getCurrentWebView();
if (w != null) {
w.setNetworkAvailable(up);//告诉webview 网络是否可以联通
}
}
boolean isNetworkUp() {
return mIsNetworkUp;
}
private void sendNetworkType(String type, String subtype) {
WebView w = mController.getCurrentWebView();
if (w != null) {
//通知内核当前的网络信息
w.setNetworkType(type, subtype);
}
}
}
至此浏览器的分析基本上就结束了, 当然也不是特别全面, 回头看去, 也积累了很多东西, 多看代码, 每天积累一些, 对发展是又好处的.