Update help viewer for Amazon devices

app/src/main/java/com/limelight/HelpActivity.java

@@ -1,19 +1,79 @@
 package com.limelight;
 
 import android.app.Activity;
+import android.graphics.Bitmap;
 import android.os.Bundle;
 import android.webkit.WebView;
+import android.webkit.WebViewClient;
+
+import com.limelight.utils.SpinnerDialog;
 
 public class HelpActivity extends Activity {
 
+    private SpinnerDialog loadingDialog;
+    private WebView webView;
+
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
 
-        WebView webView = new WebView(this);
+        webView = new WebView(this);
         setContentView(webView);
 
+        // These allow the user to zoom the page
+        webView.getSettings().setBuiltInZoomControls(true);
+        webView.getSettings().setDisplayZoomControls(false);
+
+        // This sets the view to display the whole page by default
+        webView.getSettings().setUseWideViewPort(true);
+        webView.getSettings().setLoadWithOverviewMode(true);
+
+        // This allows the links to places on the same page to work
         webView.getSettings().setJavaScriptEnabled(true);
+
+        webView.setWebViewClient(new WebViewClient() {
+            @Override
+            public void onPageStarted(WebView view, String url, Bitmap favicon) {
+                if (loadingDialog == null) {
+                    loadingDialog = SpinnerDialog.displayDialog(HelpActivity.this,
+                            getResources().getString(R.string.help_loading_title),
+                            getResources().getString(R.string.help_loading_msg), false);
+                }
+            }
+
+            @Override
+            public void onPageFinished(WebView view, String url) {
+                if (loadingDialog != null) {
+                    loadingDialog.dismiss();
+                    loadingDialog = null;
+                }
+            }
+
+            @Override
+            public boolean shouldOverrideUrlLoading(WebView view, String url) {
+                if (url.toUpperCase().startsWith("https://github.com/moonlight-stream/moonlight-docs/wiki/".toUpperCase()) ||
+                        url.toUpperCase().startsWith("http://github.com/moonlight-stream/moonlight-docs/wiki/".toUpperCase())) {
+                    // Allow navigation to Moonlight docs
+                    return false;
+                }
+                else {
+                    return true;
+                }
+            }
+        });
+
         webView.loadUrl(getIntent().getData().toString());
     }
+
+    @Override
+    public void onBackPressed() {
+        // Back goes back through the WebView history
+        // until no more history remains
+        if (webView.canGoBack()) {
+            webView.goBack();
+        }
+        else {
+            super.onBackPressed();
+        }
+    }
 }

app/src/main/java/com/limelight/utils/HelpLauncher.java

@@ -4,25 +4,33 @@ import android.content.ActivityNotFoundException;
 import android.content.Context;
 import android.content.Intent;
 import android.net.Uri;
+import android.os.Build;
 
 import com.limelight.HelpActivity;
 
 public class HelpLauncher {
 
     private static void launchUrl(Context context, String url) {
-        Intent i = new Intent(Intent.ACTION_VIEW);
-        i.setData(Uri.parse(url));
-
         // Try to launch the default browser
         try {
-            context.startActivity(i);
+            // Fire TV devices will lie and say they do have a browser
+            // even though the OS just shows an error dialog if we
+            // try to use it.
+            if (!"Amazon".equalsIgnoreCase(Build.MANUFACTURER)) {
+                Intent i = new Intent(Intent.ACTION_VIEW);
+                i.setData(Uri.parse(url));
+                context.startActivity(i);
+                return;
+            }
         } catch (ActivityNotFoundException e) {
-            // This platform has no browser (possibly a leanback device)
-            // We'll launch our WebView activity
-            i = new Intent(context, HelpActivity.class);
-            i.setData(Uri.parse(url));
-            context.startActivity(i);
+            // Fall through
         }
+
+        // This platform has no browser (possibly a leanback device)
+        // We'll launch our WebView activity
+        Intent i = new Intent(context, HelpActivity.class);
+        i.setData(Uri.parse(url));
+        context.startActivity(i);
     }
 
     public static void launchSetupGuide(Context context) {

app/src/main/res/values/strings.xml

@@ -4,6 +4,10 @@
     <string name="scut_deleted_pc">PC deleted</string>
     <string name="scut_not_paired">PC not paired</string>
 
+    <!-- Help strings -->
+    <string name="help_loading_title">Help Viewer</string>
+    <string name="help_loading_msg">Loading help page…</string>
+
     <!-- PC view menu entries -->
     <string name="pcview_menu_app_list">View Game List</string>
     <string name="pcview_menu_pair_pc">Pair with PC</string>