Question

enter image description here我在webview上的活动上使用webview，有一个后退按钮（不是键盘上的背压按钮），它是可点击的，但是它不工作。任何想法如何处理这个点击webview按钮。

CookieManager cookieManager = CookieManager.getInstance（）; cookieManager.setAcceptCookie（真）;

    webView.getSettings().setJavaScriptEnabled(true);

    webView.setWebViewClient(new WebViewClient() {
      ProgressDialog progressDialog =
          ProgressDialog.show(activity, Constants.EMPTY_VALUE, Constants.PLEASE_WAIT, true);

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

      public void onPageStarted(WebView view, String url, Bitmap favicon) {

        if (activity != null && progressDialog != null) {
          progressDialog.setCancelable(false);
        }

        updatePaymentUrl = null;
        if (url.contains("callback-data")) {
          webView.setVisibility(View.GONE);
          showpDialog();
          int indexQ = url.indexOf("?");
          partUrl = url.substring(indexQ + 1, url.length());
          speedOrderUpdateApi();
        }

        if (updatePaymentUrl != null) {
          super.onPageStarted(view, updatePaymentUrl, favicon);
        } else {
          super.onPageStarted(view, url, favicon);
        }
      }

      public void onReceivedError(WebView view, int errorCode, String description,
          String failingUrl) {
        Logger.logInfo("errorCode = ", String.valueOf(errorCode));
        Logger.logInfo("description = ", description);
        Logger.logInfo("failingUrl = ", failingUrl);
        super.onReceivedError(view, errorCode, description, failingUrl);
      }

      @Override
      public void onPageFinished(WebView view, String url) {
        if (activity != null && progressDialog != null) {
          if (progressDialog.isShowing()) {
            progressDialog.dismiss();
          }

          // If title not found hide webview
          Logger.logInfo("view.getTitle() = ", view.getTitle());
          if (view.getTitle() != null && "Not Found".equals(view.getTitle())) {
            view.setVisibility(View.INVISIBLE);
            Toast.makeText(activity, "Link Not Found", Toast.LENGTH_LONG).show();
          }
        }
      }
    });

    // Not needed
    Random random = new Random(System.currentTimeMillis());
    int randomNumber = random.nextInt();
    Logger.logInfo("urlTemp = ", url);
    webView.loadUrl(url, headers);
  }

Answer 1

WebView默认情况下没有OnBackPress，而我们使用onKeyDown来转到上一页，例如，您可以将此代码放入{{1活动

WebView

<强>更新

将此代码放入@Override public boolean onKeyDown (int keyCode, KeyEvent event) { if ((keyCode == KeyEvent.KEYCODE_BACK) && webView.canGoBack()) { webView.goBack(); // go back in only the web view return true; } return super.onKeyDown(keyCode, event); }按钮

onClick()

Answer 2

您可以使用assembleDebug从您的网页与本地代码进行通信，

对于这些内容，您必须创建一个WebView.addJavaScriptInterface()（将其命名为您想要的任何内容）并将其作为WebInterface添加到您的JavascriptInterface，

例如

WebView

现在将此界面添加到您的网页视图

public class YourWebInterface {

    private Context context;

    public YourWebInterface(Context context) {
        this.context = context;
    }

    @JavascriptInterface
    public void goBack() {
        if(webView.canGoBack()){
           webView.goBack();
        } else {
          finish();
        }
    }
}

现在在您的网页中，您可以使用webView.addJavascriptInterface(new YourWebInterface(context), "Android");传递的Android对象来调用此方法，

如果您点击网页上的按钮，可以执行以下操作：

Interface

在webview的webview后退按钮上没有导航到上一个活动/页面

2 个答案: