Enable geolocation on Android

Author: lucianoiam

android/src/main/java/com/flutter_webview_plugin/FlutterWebviewPlugin.java

@@ -97,6 +97,7 @@ private void openUrl(MethodCall call, MethodChannel.Result result) {
         Map<String, String> headers = call.argument("headers");
         boolean scrollBar = call.argument("scrollBar");
         boolean allowFileURLs = call.argument("allowFileURLs");
+        boolean geolocationEnabled = call.argument("geolocationEnabled");
 
         if (webViewManager == null || webViewManager.closed == true) {
             webViewManager = new WebviewManager(activity);
@@ -118,7 +119,8 @@ private void openUrl(MethodCall call, MethodChannel.Result result) {
                 scrollBar,
                 supportMultipleWindows,
                 appCacheEnabled,
-                allowFileURLs
+                allowFileURLs,
+                geolocationEnabled
         );
         result.success(null);
     }

android/src/main/java/com/flutter_webview_plugin/WebviewManager.java

@@ -204,7 +204,8 @@ void openUrl(
             boolean scrollBar,
             boolean supportMultipleWindows,
             boolean appCacheEnabled,
-            boolean allowFileURLs
+            boolean allowFileURLs,
+            boolean geolocationEnabled
     ) {
         webView.getSettings().setJavaScriptEnabled(withJavascript);
         webView.getSettings().setBuiltInZoomControls(withZoom);
@@ -219,6 +220,16 @@ void openUrl(
         webView.getSettings().setAllowFileAccessFromFileURLs(allowFileURLs);
         webView.getSettings().setAllowUniversalAccessFromFileURLs(allowFileURLs);
 
+        if (geolocationEnabled) {
+            webView.getSettings().setGeolocationEnabled(true);
+            webView.setWebChromeClient(new WebChromeClient() {
+                @Override
+                public void onGeolocationPermissionsShowPrompt(String origin, GeolocationPermissions.Callback callback) {
+                    callback.invoke(origin, true, false);
+                }
+            });
+        }
+
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
             webView.getSettings().setMixedContentMode(WebSettings.MIXED_CONTENT_COMPATIBILITY_MODE);
         }