带WebView的Android弹出式登录屏幕

Question

我打开了一个webpage使用WebView扩展WebChromeClient。

该页面具有用于登录的弹出窗口，如下图所示。

当我使用时setWebViewClient，它只会提示我白屏，因此我猜测它不支持Authentication。当我尝试创建custom时WebViewClient，我发现它有一个称为的方法onReceivedHttpAuthRequest，我认为这是正确的位置，但是如何在屏幕上显示弹出窗口？

public class BaseWebViewClient extends WebViewClient {

public enum SpinnerMode {
    ALWAYS,
    FIRST,
    DISABLED
}

private final CoordinatorLayout webViewContainer;
private final RelativeLayout progressBarOverlay;

private WeakReference<BaseWebViewActivity> activityRef;
private BaseWebViewStateRemover stateRemover = new BaseWebViewStateRemover();

private boolean isFirstPage = true;
private SpinnerMode spinnerMode;

public BaseWebViewClient(BaseWebViewActivity activity, CoordinatorLayout container, RelativeLayout progressBarOverlay, SpinnerMode spinnerMode) {
    this.activityRef = new WeakReference<BaseWebViewActivity>(activity);
    this.webViewContainer = container;
    this.progressBarOverlay = progressBarOverlay;
    this.spinnerMode = spinnerMode != null ? spinnerMode : SpinnerMode.DISABLED;
}

@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
    view.loadUrl(url);
    return true;
}

@Override
public void onReceivedSslError(WebView view, SslErrorHandler handler, SslError error) {
    Logger.e("onReceivedSslError: " + (error != null ? error.toString() : "null"));
    BaseWebViewActivity activity = activityRef.get();
    if (activity != null) {
        activity.onReceivedSslError(view, handler, error);
    }
    super.onReceivedSslError(view, handler, error);
}

@Nullable
@Override
public WebResourceResponse shouldInterceptRequest(final WebView view, WebResourceRequest request) {
    BaseWebViewActivity context = this.activityRef.get();
    if(context != null) {
        stateRemover.removeStateOnLogoutRequestMatch(context, request, view, webViewContainer);
    } else {
        Logger.w("Cannot remove app session context fully, activity reference is null");
    }
    return super.shouldInterceptRequest(view, request);
}

@Override
public void onPageStarted(final WebView webView, String url, Bitmap favicon) {
    super.onPageStarted(webView, url, favicon);
    Logger.d("Webview loading started for URL " + filterHashFragment(url));

    if (spinnerMode == SpinnerMode.ALWAYS
            || spinnerMode == SpinnerMode.FIRST && isFirstPage) {
        progressBarOverlay.setVisibility(View.VISIBLE);
        webView.setVisibility(View.GONE);
    }
}

@Override
public void onPageFinished(final WebView webView, String url) {
    super.onPageFinished(webView, url);
    Logger.d("Webview loading finished for URL " + filterHashFragment(url));

    if (spinnerMode == SpinnerMode.ALWAYS
            || spinnerMode == SpinnerMode.FIRST && isFirstPage) {
        // Add short delay because onPageFinished triggers often a bit early causing the
        // previous page to be briefly shown.
        SystemClock.sleep(150);
        Activity activity = activityRef.get();
        if(activity != null) {
            activity.runOnUiThread(new Runnable() {
                @Override
                public void run() {
                    progressBarOverlay.setVisibility(View.GONE);
                    webView.setVisibility(View.VISIBLE);
                }
            });
        } else {
            Logger.w("activity is not available");
        }
    }

    if (isFirstPage)
        isFirstPage = false;
}

private String filterHashFragment(String url) {
    return url.split("#")[0];
}

}

ChromeClient（永远不会到达onJsAlert）

public class BaseWebChromeClient extends WebChromeClient {
private WeakReference<BaseWebViewActivity> activityRef;

public BaseWebChromeClient(BaseWebViewActivity activity) {
    this.activityRef = new WeakReference<BaseWebViewActivity>(activity);
}

@Override
public boolean onConsoleMessage(ConsoleMessage cm) {
    Log.i("js console: ",   cm.message() + " -- line "
            + cm.lineNumber() + " of "
            + cm.sourceId());
    return true;
}

@Override
public boolean onJsAlert(WebView view, String url, String message, JsResult result) {
    Log.i("testing123", "got js alert");

    return super.onJsAlert(view, url, message, result);
}
}  

我在这里称Webview：

    webView = findViewById(R.id.baseWebView);
    webViewContainer = findViewById(R.id.webview_container);
    WebSettings webSettings = webView.getSettings();
    webSettings.setJavaScriptEnabled(true);
    webSettings.setDomStorageEnabled(true);
    webSettings.setDatabaseEnabled(true);
    webView.getSettings().setAllowUniversalAccessFromFileURLs(true);
    webView.getSettings().setAllowFileAccess(true);
    webSettings.setJavaScriptCanOpenWindowsAutomatically(true);

    webView.setWebChromeClient(new BaseWebChromeClient(this));
    webView.setWebViewClient(new BaseWebViewClient(this, webViewContainer,
            (RelativeLayout)findViewById(R.id.progressBarOverlay), getSpinnerMode(intent)));

如果这不可能，那么当单击登录按钮时，可以创建自定义登录屏幕。但是，在创建自定义屏幕时，我该如何将其发送login details (username/password)到WebViewClient以及如何从中获取响应等。

编辑！！

添加了我的自定义客户端代码。

提供用户名和密码时，onReceivedHttpAuthRequest就像这样

@Override
public void onReceivedHttpAuthRequest(WebView view, final HttpAuthHandler handler, String host, String realm) {
    handler.proceed("username", "password");
}

该应用程序将登录并继续运行。当我输入错误的凭据时，应用程序会给我一个错误Web page not available，net::ERR_TOO_MANY_RETRIES而当我什么都不输入时，我只会看到一个空白的空白屏幕。

Answer 1

我的解决方案是计算重试次数并在每个客户端上提示一个新的登录 onReceivedHttpAuthRequest对话框WebView。

@Override
public void onReceivedHttpAuthRequest(WebView view, final HttpAuthHandler handler, String host, String realm) {
    httpAuthRequestCounter++;
    if (httpAuthRequestCounter < 2) {
        alertDialog(handler);
        httpAuthRequestCounter = 0;
    } else {
        handler.cancel();
        goBackToLoginScreen();
    }
}

private void alertDialog(final HttpAuthHandler httpAuthHandler) {
    final AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(baseWebViewActivity);
    LayoutInflater inflater = baseWebViewActivity.getLayoutInflater();
    View dialogView = inflater.inflate(R.layout.login_dialog, null);

    final EditText txtUsername = (EditText) dialogView.findViewById(R.id.dauth_userinput);
    final EditText txtPassword = (EditText) dialogView.findViewById(R.id.dauth_passinput);

    dialogBuilder.setView(dialogView);

    dialogBuilder.setPositiveButton(android.R.string.ok,
            new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int whichButton) {
                    httpAuthHandler.proceed(txtUsername.getText().toString(), txtPassword.getText().toString());
                }
            }
    );
    dialogBuilder.setNegativeButton(android.R.string.cancel,
            new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int whichButton) {
                    httpAuthHandler.cancel();
                    goBackToLoginScreen();

                }
            }
    );

    dialogBuilder.setCancelable(false);

    AlertDialog alertDialog = dialogBuilder.create();
    alertDialog.show();
}