Add Help & feedback screens to Android Chromoting client

remoting/android/java/src/org/chromium/chromoting/HelpActivity.java

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.chromoting;
+
+import android.app.Activity;
+import android.content.Intent;
+import android.content.pm.PackageInfo;
+import android.content.pm.PackageManager;
+import android.net.Uri;
+import android.os.Bundle;
+import android.text.TextUtils;
+import android.view.Menu;
+import android.view.MenuItem;
+import android.webkit.WebView;
+import android.webkit.WebViewClient;
+
+/**
+ * The Activity for showing the Help screen.
+ */
+public class HelpActivity extends Activity {
+    private static final String PLAY_STORE_URL = "market://details?id=";
+
+    /** Launches an external web browser or application. */
+    private void openUrl(String url) {
+        Uri uri = Uri.parse(url);
+        Intent intent = new Intent(Intent.ACTION_VIEW, uri);
+
+        // Verify that the device can launch an application for this intent, otherwise
+        // startActivity() may crash the application.
+        if (intent.resolveActivity(getPackageManager()) != null) {
+            startActivity(intent);
+        }
+    }
+
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        WebView webView = new WebView(this);
+        setContentView(webView);
+
+        getActionBar().setTitle(getString(R.string.actionbar_help_title));
+
+        CharSequence appName = getTitle();
+        CharSequence versionName = null;
+        try {
+            PackageInfo info = getPackageManager().getPackageInfo(getPackageName(), 0);
+            versionName = info.versionName;
+        } catch (PackageManager.NameNotFoundException ex) {
+            throw new RuntimeException("Unable to get version: " + ex);
+        }
+
+        CharSequence subtitle = TextUtils.concat(appName, " ", versionName);
+        getActionBar().setSubtitle(subtitle);
+
+        // This line ensures the WebView remains embedded in this activity and doesn't launch an
+        // external Chrome browser.
+        webView.setWebViewClient(new WebViewClient());
+        webView.getSettings().setJavaScriptEnabled(true);
+        String url = getIntent().getDataString();
+        webView.loadUrl(url);
+    }
+
+    @Override
+    public boolean onCreateOptionsMenu(Menu menu) {
+        getMenuInflater().inflate(R.menu.help_actionbar, menu);
+        return super.onCreateOptionsMenu(menu);
+    }
+
+    @Override
+    public boolean onOptionsItemSelected(MenuItem item) {
+        switch (item.getItemId()) {
+            case R.id.actionbar_play_store:
+                openUrl(PLAY_STORE_URL + getPackageName());
+                return true;
+
+            default:
+                return super.onOptionsItemSelected(item);
+        }
+    }
+}