Fix beforeload for Android <= 7 (#427)

* Fix beforeload for Android <= 7
* Change Android version check conditional

Author: Ralph Gutkowski

src/android/InAppBrowser.java

@@ -148,6 +148,7 @@ public class InAppBrowser extends CordovaPlugin {
     private String footerColor = "";
     private String beforeload = "";
     private String[] allowedSchemes;
+    private InAppBrowserClient currentClient;
 
     /**
      * Executes the request and returns PluginResult.
@@ -264,7 +265,12 @@ else if (action.equals("loadAfterBeforeload")) {
                 @SuppressLint("NewApi")
                 @Override
                 public void run() {
-                    ((InAppBrowserClient)inAppWebView.getWebViewClient()).waitForBeforeload = false;
+                    if (android.os.Build.VERSION.SDK_INT < android.os.Build.VERSION_CODES.O) {
+                        currentClient.waitForBeforeload = false;
+                        inAppWebView.setWebViewClient(currentClient);
+                    } else {
+                        ((InAppBrowserClient)inAppWebView.getWebViewClient()).waitForBeforeload = false;
+                    }
                     inAppWebView.loadUrl(url);
                 }
             });
@@ -964,8 +970,8 @@ public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType)
                     }
 
                 });
-                WebViewClient client = new InAppBrowserClient(thatWebView, edittext, beforeload);
-                inAppWebView.setWebViewClient(client);
+                currentClient = new InAppBrowserClient(thatWebView, edittext, beforeload);
+                inAppWebView.setWebViewClient(currentClient);
                 WebSettings settings = inAppWebView.getSettings();
                 settings.setJavaScriptEnabled(true);
                 settings.setJavaScriptCanOpenWindowsAutomatically(true);
@@ -1200,7 +1206,9 @@ public boolean shouldOverrideUrlLoading(String url, String method) {
             boolean useBeforeload = false;
             String errorMessage = null;
 
-            if(beforeload.equals("yes")
+            if (beforeload.equals("yes") && method == null) {
+                useBeforeload = true;
+            }else if(beforeload.equals("yes")
                     //TODO handle POST requests then this condition can be removed:
                     && !method.equals("POST"))
             {