Android浏览器Browser二次开发（四）浏览器中的APN切换

Android浏览器Browser二次开发（四）浏览器中的APN切换

文章分类:移动开发

第四章 浏览器中的APN切换

业务需求：有些链接需要使用CMWAP接入点才能成功访问， 我们的浏览器必须能够自动切换CNNET, CMWAP.

分析：调用浏览器的时候在Intent中传递一个参数， 用于标示接入点需要。 我们的浏览器需要处理3种情况， 第一是参数为cmwap时，
切换成cmwap； 第二是参数为cmnet或者从桌面上的浏览器图标点击， 第一次启动浏览器时， 切换成cmnet; 第三是打开一个链接，
没有参数时， 不做切换， 直接使用当前接入点。 如果已经打开浏览器， 并且切换成cmwap， 无论后来如何去手动设置接入点，
当点击浏览器里面的链接， 或者输入其他地址进行访问时， 必须能够再次切换成wap. 已经打开为cmnet浏览器同理。 在需要切换的时候，
必须等到切换完成， 新的接入点成功连接上以后才能开始数据的载入。

改动： 1. 接入点切换方法

/*

* change current network connection to cmwap if it's not. added by Qkf36923

*/

public int forceAPNConnection(String apnName) {

//validate apn name.

if (apnName == null || apnName.equals("") ||

(!("cmwap".equals(apnName)||"cmnet".equals(apnName)))) {

return 0;

}

NetworkInfo info = conManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);

if (!info.isAvailable()) {

return 0;

}

info = conManager.getActiveNetworkInfo();

String tempAPN = info == null ? "" : info.getExtraInfo();

//if current apn is not cmwap, we have to switch to cmwap.

if (!apnName.equals(tempAPN)) {

if (mNChangeReceiver != null) {

this.unregisterReceiver(mNChangeReceiver);

}

mNChangeReceiver = new NetworkChangeReceiver();

//register receiver for wap network connection.

IntentFilter upIntentFilter = new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION);

registerReceiver(mNChangeReceiver, upIntentFilter);

updateCurrentAPN(getContentResolver(), apnName);

return 1;

}

return 0;

}

在onCreate和onNewIntent的方法中去判断是否需要切换， 以及设置一些标示。

public void onCreate(Bundle icicle) {

…

if (!mTabControl.restoreState(icicle)) {

// clear up the thumbnail directory if we can't restore the state as

// none of the files in the directory are referenced any more.

new ClearThumbnails().execute(

mTabControl.getThumbnailDir().listFiles());

// there is no quit on Android. But if we can't restore the state,

// we can treat it as a new Browser, remove the old session cookies.

CookieManager.getInstance().removeSessionCookie();

final Intent intent = getIntent();

final Bundle extra = intent.getExtras();

// Create an initial tab.

// If the intent is ACTION_VIEW and data is not null, the Browser is

// invoked to view the content by another application. In this case,

// the tab will be close when exit.

UrlData urlData = getUrlDataFromIntent(intent, null);

/*

* when request connection is specified to cmwap, we have to change current APN

* added by Qkf36923, 20110113

*/

String requestConType = intent.getStringExtra("data_connection");

if (requestConType == null) {

//if launched from launcher, it's treated as WWW browser

if (intent.getAction().equals(Intent.ACTION_MAIN)) {

dataConnectionType = "cmnet";

} else {

//get current APN type and set it to browser

if (info != null) {

String tempAPN = info.getExtraInfo();

dataConnectionType = tempAPN;

}

}

if (forceAPNConnection(dataConnectionType) == 1) {

isSwitchingToNet = true;

}

} else if ("cmwap".equals(requestConType)

&& info != null && (!"cmwap".equals(info.getExtraInfo()))) {

dataConnectionType = "cmwap";

if (forceAPNConnection(dataConnectionType) == 1) {

isSwitchingToWap = true;

}

}

下面会去调用loadUrl和loadDataIn方法， 需要做相应修改：

private void loadUrl(WebView view, String url) {

updateTitleBarForNewLoad(view, url);

/**if url is navigation page, we can load it from local directly.

* Added by QuYueting 20110310. Start.

*/

if (mNChangeReceiver != null) {

if (BrowserSettings.NAVIGATION_PAGE_URL.equals(url)

|| (url != null && url.startsWith("about:"))) {

autoLoad = true;

view.loadUrl(url);

} else {

autoLoad = false;

mWebView = view;

tempUrl = url;

}

} else {

view.loadUrl(url);

}

/**Added by QuYueting 20110310. End**/

}

LoadUrlDataIn方法同时也会被onNewIntent调用。

private void loadUrlDataIn(Tab t, UrlData data) {

//if it's not called from OnCreate and it's switching to wap, postpone data loading. added by Qkf36923

updateTitleBarForNewLoad(t.getWebView(), data.mUrl);

/**if no need to switch or home page is set as empty, we should load navigation page instantly.

* Added by QuYueting 20110310. Start**/

if (mNChangeReceiver == null ||

(data.isEmpty() && mSettings.getHomePage().equals(""))

|| (BrowserSettings.NAVIGATION_PAGE_URL.equals(data.mUrl))

|| (data.mUrl != null && data.mUrl.startsWith("about:"))) {

data.loadIn(t);

} else {

mt = t;

mUrlData = data;

}

/**if no need to switch or home page is set as empty, we should load navigation page instantly.

* Added by QuYueting 20110310. End**/

}

再看对OnNewIntent的修改

protected void onNewIntent(Intent intent) {

…

UrlData urlData = getUrlDataFromIntent(intent, current);

//get request connection type, if current connection type is cmwap, it indicates

//this is monternet browser, we won't change APN any more.

String requestConType = intent.getStringExtra("data_connection");

if (requestConType == null) {

//get current APN, set browser connection type.

NetworkInfo network = conManager.getActiveNetworkInfo();

if (network != null && network.isAvailable()) {

dataConnectionType = network.getExtraInfo();

}

} else if ("cmwap".equals(requestConType) || "cmnet".equals(requestConType)){

dataConnectionType = requestConType;

if (forceAPNConnection(dataConnectionType) == 1) {

if ("cmwap".equals(requestConType)) {

isSwitchingToWap = true;

}

if ("cmnet".equals(requestConType)) {

isSwitchingToNet = true;

}

}

}

fromNewIntent = true;

fromNewIntent用来标志是否是第一次创建浏览器， 这在连接上目标APN网络以后如何打开页面有关系。

下面是NetworkChangeReceiver的定义

/*

* receiver for observing network connection change, added by Qkf36923

*/

public class NetworkChangeReceiver extends BroadcastReceiver {

public void onReceive(Context context, Intent intent) {

if (ConnectivityManager.CONNECTIVITY_ACTION.equals(intent.getAction())) {

//NetworkInfo info = conManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);

NetworkInfo info = intent.getParcelableExtra(

ConnectivityManager.EXTRA_NETWORK_INFO);

String apn = info.getExtraInfo();

if (((isSwitchingToWap && "cmwap".equals(apn))

|| (isSwitchingToNet && "cmnet".equals(apn)))

&& info.isConnected() && info.isAvailable()) {

/*

* apn change message is sent out more than once during a second, but it

* only happens once practically.

*/

if(mNChangeReceiver != null) {

WebView.disablePlatformNotifications();

WebView.enablePlatformNotifications();

if (fromNewIntent) {

loadUrlOnNewIntent();

} else {

if (!autoLoad) {

loadUrlOnCreate();

autoLoad = true;

}

}

BrowserActivity.this.unregisterReceiver(mNChangeReceiver);

mNChangeReceiver = null;

Message message = connectionHandler.obtainMessage(0);

connectionHandler.sendMessageDelayed(message, 300);

}

}

}

}

}

//load data when on Create. added by Qkf36923

private void loadUrlOnCreate() {

if (mUrlData.isEmpty()) {

if (mWebView != null) {

mWebView.loadUrl(tempUrl);

mWebView = null;

}

} else {

if (mUrlData != null) {

mUrlData.loadIn(mt);

mUrlData = null;

}

}

}

private void loadUrlOnNewIntent() {

//updateTitleBarForNewLoad(mt.getWebView(), mUrlData.mUrl);

mUrlData.loadIn(mt);

}

//new handler for setting wap switching flag. added by Qkf36923

Handler connectionHandler = new Handler() {

public void handleMessage(Message msg) {

super.handleMessage(msg);

if (receivedByStateListener) {

receivedByStateListener = false;

resetSwitchingFlag();

} else {

Message message = connectionHandler.obtainMessage(0);

connectionHandler.sendMessageDelayed(message, 300);

}

}

};

connectionHandler用于发送消息重置isSwitchingToWap和isSwitchingToNet标志。
因为本来浏览器中有一个网络监听器， 用于弹出网络是否存在的提示框。 我们进行接入点切换时网络会先断掉， 会被那个监听器收到，
从而弹出网络不存在的提示框， 这样用户体验不好，我们需要在切换的时候屏蔽掉。 所以做了以下修改：

mNetworkStateIntentReceiver = new BroadcastReceiver() {

@Override

public void onReceive(Context context, Intent intent) {

if (intent.getAction().equals(

ConnectivityManager.CONNECTIVITY_ACTION)) {…

if (!isSwitchingToWap && !isSwitchingToNet) {

onNetworkToggle(info.isAvailable());

} else {

这样当网络连接成功后， 我们需要把标志再重置回去。

这篇文章转自： http://seya.iteye.com/blog/966471