我有一个应用程序，我使用我的用户名和密码登录，然后切换到包含webview的页面。 webview识别此用户名和密码并加载内容（通过共享偏好），但问题是，它仅加载ONCE，当我导航到我的应用程序的其他部分并返回时，它显示一个空白屏幕，最终加载页面不能在网页视图中显示出来。无论如何要解决这个问题，保持webview识别用户名并通过每次你导航到页面并加载内容。这是相同的代码： 包含webview的页面：
public class AnswersFragmentWebView extends Fragment implements MainActivity.BackPressListener<Fragment> {
private static final String SYMBOL = "symbol";
private static final String SYMBOL_TYPE = "symbol_type";
public static final String CONTAINER_ID = "container_id";
public static final String TAG_QUOTES_FRAGMENT_WEBVIEW = "AnswersFragmentWebView";
public static void removeInstance(final FragmentManager manager) {
final AnswersFragmentWebView fragment = (AnswersFragmentWebView) manager.findFragmentByTag(TAG_QUOTES_FRAGMENT_WEBVIEW);
if (fragment == null) {
return;
}
final FragmentStackManager stackManager = FragmentStackManager.getInstance();
if (stackManager.getTopFragment() instanceof AnswersFragmentWebView) {
stackManager.popTopFragment();
}
}
private boolean goingBack = false;
private boolean onBackPressClearStack = true;
private WebView webView;
private final static String URL = "https://amers1.mobile13.cp.justice.com/msf1.0/fwd/answers/answers/service/v1/?q=ibm%20revenue&ui.theme=dark&uuid=PADACT-002&userAgent=iphone";
//private final static String URL = "https://www.google.com";
SharedPreferencesManager manager = SharedPreferencesManager.getInstance();
private final String USERNAME =manager.getLoginUsername();
private final String PASSWORD = manager.getDecryptedLoginPassword();
private final static String HOST = "https://amers1.mobile13.cp.justice.com/msf1.0/fwd/answers/answers/service/v1/?q=ibm%20revenue&ui.theme=novadark&uuid=PADACT-002&userAgent=iphone";
private final static String REALM = "Users Only";
public void setOnBackPressClearStack(boolean b){
onBackPressClearStack = b;
}
public boolean webViewSteppedBack() {
if (webView != null && webView.canGoBack()) {
webView.goBack();
return true;
}
return false;
}
@Override
public boolean backPressed(final MainActivity mainActivity) {
if (webViewSteppedBack()) {
return true;
}
if (onBackPressClearStack) {
goingBack = true;
FragmentUtils.onBackPressedKnockFragsOffStack(mainActivity, this);
}
return false;
}
private static AnswersFragmentWebView __newInstance(final AnswersFragmentWebView fragment, final FragmentManager manager,
final String searchAutoSuggestSymbol, final String symbolType, int containerViewId, final int inAnimation, final int outAnimation, final int popInAnimation, final int popOutAnimation) {
final Bundle bundle = new Bundle();
bundle.putString(AnswersFragmentWebView.SYMBOL, searchAutoSuggestSymbol);
bundle.putString(AnswersFragmentWebView.SYMBOL_TYPE, symbolType);
bundle.putInt(AnswersFragmentWebView.CONTAINER_ID, containerViewId);
fragment.setArguments(bundle);
FragmentInfo fragmentInfo = new FragmentInfo(TransactionMethods.ADD, containerViewId);
fragmentInfo.setAnimation(inAnimation, outAnimation);
fragmentInfo.setPopAnimation(popInAnimation, popOutAnimation);
fragmentInfo.setFragmentTag(TAG_QUOTES_FRAGMENT_WEBVIEW);
fragmentInfo.setActionBarTitle(Application.getAppResources().getString(R.string.nav_option_quotes));
FragmentStackManager.getInstance().transitionFragment(manager, fragment, fragmentInfo);
return fragment;
}
private static AnswersFragmentWebView __newInstance(final AnswersFragmentWebView fragment, final FragmentManager manager,
final String searchAutoSuggestSymbol, final String symbolType, int containerViewId) {
return __newInstance(fragment, manager, searchAutoSuggestSymbol, symbolType, containerViewId, R.anim.slide_in_from_right, R.anim.slide_out_to_left, R.anim.slide_in_from_left, R.anim.slide_out_to_right);
}
private static void clearWebView(final FragmentManager manager) {
final AnswersFragmentWebView fragment = (AnswersFragmentWebView) manager.findFragmentByTag(TAG_QUOTES_FRAGMENT_WEBVIEW);
if (fragment != null && fragment instanceof AnswersFragmentWebView) {
((AnswersFragmentWebView)fragment).clearWebView();
}
}
public static AnswersFragmentWebView newInstance(final FragmentManager manager, final String searchAutoSuggestSymbol, String symbolType) {
clearWebView(manager);
return __newInstance(new AnswersFragmentWebView(), manager, searchAutoSuggestSymbol, symbolType, R.id.fragment_container);
}
public static AnswersFragmentWebView newInstance(final FragmentManager manager, final String searchAutoSuggestSymbol, String symbolType, int containerViewId) {
clearWebView(manager);
return __newInstance(new AnswersFragmentWebView(), manager, searchAutoSuggestSymbol, symbolType, containerViewId);
}
public static AnswersFragmentWebView newInstanceNoBackPressed(final FragmentManager manager, final String searchAutoSuggestSymbol, final String symbolType, int containerViewId) {
AnswersFragmentWebView fragment = __newInstance(new AnswersFragmentWebView(), manager, searchAutoSuggestSymbol, symbolType, containerViewId);
fragment.setOnBackPressClearStack(false);
return fragment;
}
public static AnswersFragmentWebView newInstanceNoBackPressed(final AnswersFragmentWebView fragment, final FragmentManager manager, final String searchAutoSuggestSymbol, final String symbolType, int containerViewId) {
fragment.setOnBackPressClearStack(false);
return __newInstance(fragment, manager, searchAutoSuggestSymbol, symbolType, containerViewId);
}
public static AnswersFragmentWebView newInstanceForSearch(final FragmentManager manager, final String searchAutoSuggestSymbol, String symbolType) {
AnswersFragmentWebView fragment = __newInstance(new AnswersFragmentWebView(), manager, searchAutoSuggestSymbol, symbolType, R.id.fragment_container, R.anim.no_animation, R.anim.slide_out_to_right, R.anim.slide_in_from_right, R.anim.slide_out_to_right);
return fragment;
}
public void clearWebView() {
if (webView != null) {
webView.removeAllViews();
webView.destroy();
webView = null;
}
}
@SuppressWarnings("deprecation")
@SuppressLint("NewApi")
@Override
public View onCreateView(final LayoutInflater inflater, final ViewGroup container, final Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (goingBack) {
return null;
}
final MainActivity activity = (MainActivity) getActivity();
activity.setBackPressListener(this);
final View view = inflater.inflate(R.layout.fragment_search_answers, container, false);
if (!NetworkUtils.isOnline()) {
LayoutUtils.showNoResult(view, R.id.quotes_webview_container);
return view;
}
// setup webview
webView = (WebView) view.findViewById(R.id.webview);
webView.setVisibility(View.VISIBLE);
webView.getSettings().setJavaScriptEnabled(true);
webView.setWebChromeClient(new WebChromeClient());
webView.setBackgroundColor(0);
webView.requestFocus();
webView.reload();
webView.getSettings().setSavePassword(true);
webView.getSettings().setSaveFormData(true);
webView.getSettings().getSaveFormData();
webView.getSettings().getSavePassword();
//WebViewDatabase.getInstance(getActivity()).clearHttpAuthUsernamePassword();
WebViewDatabase.getInstance(getActivity()).hasHttpAuthUsernamePassword();
webView.setHttpAuthUsernamePassword(HOST, REALM, USERNAME, PASSWORD);
webView.setWebViewClient(new AnswersWebView(this,webView));
webView.loadUrl(URL);
return view;
}
@Override
public void onCreate(final Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getArguments().getString(AnswersFragmentWebView.SYMBOL);
}
}
webview客户端：
public class AnswersWebView extends WebViewClient {
private String loginCookie;
private Context mContext;
private WebView mWebView;
public AnswersWebView(AnswersFragmentWebView answersFragmentWebView, WebView webview) {
super();
//mContext = answersFragmentWebView;
mWebView = webview;
}
@Override
public void onPageStarted( WebView view, String url, Bitmap favicon ) {
}
@Override
public void onPageFinished( WebView view, String url ) {
CookieManager cookieManager = CookieManager.getInstance();
cookieManager.setCookie(url, loginCookie);
}
@Override
public void onReceivedError( WebView view, int errorCode, String description, String failingUrl ) {
Toast.makeText(view.getContext(), "ÉyÅ[ÉWì«Ç›çûÇ›ÉGÉâÅ[", Toast.LENGTH_LONG).show();
}
@Override
public void onLoadResource( WebView view, String url ){
CookieManager cookieManager = CookieManager.getInstance();
loginCookie = cookieManager.getCookie(url);
}
@Override
public boolean shouldOverrideUrlLoading( WebView view, String url ) {
return false;
}
@Override
public void onReceivedSslError( WebView view, SslErrorHandler handler, SslError error ) {
handler.proceed();
}
@Override
public void onReceivedHttpAuthRequest( WebView view, final HttpAuthHandler handler, final String host, final String realm ){
SharedPreferencesManager manager = SharedPreferencesManager.getInstance();
String userName = manager.getLoginUsername();
String userPass = manager.getDecryptedLoginPassword();
if (handler.useHttpAuthUsernamePassword() && view != null) {
String[] haup = view.getHttpAuthUsernamePassword(host, realm);
if (haup != null && haup.length == 2) {
userName = haup[0];
userPass = haup[1];
}
}
if (userName != null && userPass != null) {
handler.proceed(userName, userPass);
}
else {
showHttpAuthDialog(handler, host, realm, null, null, null);
}
}
private void showHttpAuthDialog( final HttpAuthHandler handler, final String host, final String realm, final String title, final String name, final String password ) {
LinearLayout llayout = new LinearLayout((Activity)mContext);
final TextView textview1 = new TextView((Activity)mContext);
final EditText edittext1 = new EditText((Activity)mContext);
final TextView textview2 = new TextView((Activity)mContext);
final EditText edittext2 = new EditText((Activity)mContext);
llayout.setOrientation(LinearLayout.VERTICAL);
textview1.setText("username:");
textview2.setText("password:");
llayout.addView(textview1);
llayout.addView(edittext1);
llayout.addView(textview2);
llayout.addView(edittext2);
final Builder mHttpAuthDialog = new AlertDialog.Builder((Activity)mContext);
mHttpAuthDialog.setTitle("Basic Authentication")
.setView(llayout)
.setCancelable(false)
.setPositiveButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
EditText etUserName = edittext1;
String userName = etUserName.getText().toString();
EditText etUserPass = edittext2;
String userPass = etUserPass.getText().toString();
mWebView.setHttpAuthUsernamePassword(host, realm, name, password);
handler.proceed(userName, userPass);
}
})
.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
handler.cancel();
}
})
.create().show();
}
}
谢谢！ 贾斯汀
答案 0 :(得分：2)
确定。
您必须在onResume而不是OnCreate
中添加用户名/密码就像本文档中的解释一样 http://developer.android.com/reference/android/app/Activity.html
答案 1 :(得分：1)
将SharedPref代码移至onClick并在此处报告...
答案 2 :(得分：1)
这是cookie管理的问题。
案例：~1 如果您正在访问其他网站（Facebook，Gmail等） 要解决这个问题，你必须维护通过vebView发布的cookie文件。
＆安培;将其发送回下次新页面请求。
案例：~2 如果您访问自己的网站，那么另一个问题解决方案是您可以检查服务器端（在您的网站中）设备信息＆amp;将它与登录时的设备信息进行比较。
或者您可以在隐藏标签中发送隐藏数据＆amp;在您的应用中验证它。
答案 3 :(得分：1)
在我之前的项目中，我遇到了一些类似的问题。我用这种方法解决了这个问题 - 在 onCreate 中实现空白/默认布局，然后从sharedPref加载配置并在 onResume 中设置布局的参数值。在离开页面之前，在 onPause 中保存配置更改（如果发生）。如果这看起来不错，你可以在你的情况下检查它。