Bug 1042937 - Provide visual feedback while search results are loading. r=margaret

mobile/android/search/java/org/mozilla/search/PostSearchFragment.java

@@ -15,10 +15,13 @@ import android.view.ViewGroup;
 import android.webkit.WebChromeClient;
 import android.webkit.WebView;
 import android.webkit.WebViewClient;
+import android.widget.ProgressBar;
 
 public class PostSearchFragment extends Fragment {
 
     private static final String LOGTAG = "PostSearchFragment";
+
+    private ProgressBar progressBar;
     private WebView webview;
 
     private static final String HIDE_BANNER_SCRIPT = "javascript:(function(){var tag=document.createElement('style');" +
@@ -30,15 +33,26 @@ public class PostSearchFragment extends Fragment {
     @Override
     public View onCreateView(LayoutInflater inflater, ViewGroup container,
                              Bundle savedInstanceState) {
-        webview = (WebView) inflater.inflate(R.layout.search_fragment_post_search, container, false);
+        View mainView = inflater.inflate(R.layout.search_fragment_post_search, container, false);
 
+        progressBar = (ProgressBar) mainView.findViewById(R.id.progress_bar);
+
+        webview = (WebView) mainView.findViewById(R.id.webview);
+        webview.setWebChromeClient(new ChromeClient());
         webview.setWebViewClient(new LinkInterceptingClient());
-        webview.setWebChromeClient(new StyleInjectingClient());
-
         // This is required for our greasemonkey terror script.
         webview.getSettings().setJavaScriptEnabled(true);
 
-        return webview;
+        return mainView;
+    }
+
+    @Override
+    public void onDestroyView() {
+        super.onDestroyView();
+        webview.setWebChromeClient(null);
+        webview.setWebViewClient(null);
+        webview = null;
+        progressBar = null;
     }
 
     /**
@@ -90,12 +104,24 @@ public class PostSearchFragment extends Fragment {
      * event. Once the title is available, the page will have started parsing the
      * head element. The script injects its CSS into the head element.
      */
-    private class StyleInjectingClient extends WebChromeClient {
+    private class ChromeClient extends WebChromeClient {
 
         @Override
         public void onReceivedTitle(WebView view, String title) {
             super.onReceivedTitle(view, title);
             view.loadUrl(HIDE_BANNER_SCRIPT);
         }
+
+        @Override
+        public void onProgressChanged(WebView view, int newProgress) {
+            if (newProgress < 100) {
+                if (progressBar.getVisibility() == View.INVISIBLE) {
+                    progressBar.setVisibility(View.VISIBLE);
+                }
+                progressBar.setProgress(newProgress);
+            } else {
+                progressBar.setVisibility(View.INVISIBLE);
+            }
+        }
     }
 }

mobile/android/search/res/drawable/progressbar.xml

@@ -0,0 +1,9 @@
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:id="@android:id/progress">
+        <clip>
+            <shape>
+                <solid android:color="@color/highlight_orange"/>
+            </shape>
+        </clip>
+    </item>
+</layer-list>

mobile/android/search/res/layout/search_fragment_post_search.xml

@@ -2,7 +2,22 @@
    - License, v. 2.0. If a copy of the MPL was not distributed with this
    - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
 
-<WebView
+<LinearLayout
     xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical">
+
+    <ProgressBar
+        android:id="@+id/progress_bar"
+        style="@android:style/Widget.ProgressBar.Horizontal"
+        android:layout_width="match_parent"
+        android:layout_height="@dimen/progress_bar_height"
+        android:progressDrawable="@drawable/progressbar"/>
+
+    <WebView
+        android:id="@+id/webview"
+        android:layout_width="match_parent"
         android:layout_height="match_parent"/>
+</LinearLayout>
+

mobile/android/search/res/values/search_dimens.xml

@@ -6,6 +6,7 @@
     <!-- The height of the search bar is also used to offset the PreSearchFragment
          and PostSearchFragment contents -->
     <dimen name="search_bar_height">65dp</dimen>
+    <dimen name="progress_bar_height">3dp</dimen>
 
     <!-- We use background padding to create space around the cards -->
     <dimen name="card_background_padding_x">15dp</dimen>