[Android WebView] Add "about" menu with information about WebView settings to WebViewShell.

Add "about" popup menu to the "mini-browser" WebViewBrowserActivity of WebViewShell.
Clicking on the menu item results in information about WebView and current webview
settings to be printed using reflection.

BUG=481508

Review URL: https://codereview.chromium.org/1128573002

Cr-Commit-Position: refs/heads/master@{#330937}

android_webview/tools/WebViewShell/res/layout/activity_webview_browser.xml

@@ -29,6 +29,12 @@
             android:src="@drawable/breadcrumb_arrow_black"
             android:contentDescription="load url"
             android:onClick="loadUrlFromUrlBar" />
+        <ImageButton
+            android:layout_width="wrap_content" 
+            android:layout_height="match_parent" 
+            android:src="@drawable/item_more_black"
+            android:contentDescription="about webview"
+            android:onClick="showPopup" />
     </LinearLayout>
     <WebView
         android:id="@+id/webview"

android_webview/tools/WebViewShell/res/menu/main_menu.xml

+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright 2015 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. -->
+
+<menu xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:id="@+id/menu_about"
+          android:title="@string/menu_about"/>
+</menu>
\ No newline at end of file

android_webview/tools/WebViewShell/res/values/strings.xml

@@ -10,4 +10,5 @@
     <string name="title_activity_jank">WebView Jank Tester</string>
     <string name="title_activity_startup_time">WebView Startup Time Tester</string>
     <string name="title_activity_browser">WebView Browser Tester</string>
+    <string name="menu_about">About WebView</string>
 </resources>

android_webview/tools/WebViewShell/src/org/chromium/webview_shell/WebViewBrowserActivity.java

@@ -5,29 +5,47 @@
 package org.chromium.webview_shell;
 
 import android.app.Activity;
+import android.app.AlertDialog;
 import android.content.Context;
 import android.content.Intent;
 import android.os.Bundle;
+
 import android.view.KeyEvent;
+import android.view.MenuItem;
 import android.view.View;
 import android.view.View.OnKeyListener;
 import android.view.inputmethod.InputMethodManager;
+
 import android.webkit.GeolocationPermissions;
 import android.webkit.PermissionRequest;
 import android.webkit.WebChromeClient;
+import android.webkit.WebSettings;
 import android.webkit.WebView;
 import android.webkit.WebViewClient;
+
 import android.widget.EditText;
+import android.widget.LinearLayout.LayoutParams;
+import android.widget.PopupMenu;
 import android.widget.TextView;
 
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
 /**
  * This activity is designed for starting a "mini-browser" for manual testing of WebView.
  * It takes an optional URL as an argument, and displays the page. There is a URL bar
  * on top of the webview for manually specifying URLs to load.
  */
-public class WebViewBrowserActivity extends Activity {
+public class WebViewBrowserActivity extends Activity implements PopupMenu.OnMenuItemClickListener {
     private EditText mUrlBar;
     private WebView mWebView;
+    private String mWebViewVersion;
+
+    private static final Pattern WEBVIEW_VERSION_PATTERN =
+            Pattern.compile("(Chrome/)([\\d\\.]+)\\s");
 
     private static final String[] AUTOMATICALLY_GRANT =
             { PermissionRequest.RESOURCE_VIDEO_CAPTURE, PermissionRequest.RESOURCE_AUDIO_CAPTURE };
@@ -35,12 +53,18 @@ public class WebViewBrowserActivity extends Activity {
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
-        getWindow().setTitle(
-                getResources().getString(R.string.title_activity_browser));
         setContentView(R.layout.activity_webview_browser);
         mWebView = (WebView) findViewById(R.id.webview);
-        mWebView.getSettings().setJavaScriptEnabled(true);
-        mWebView.getSettings().setGeolocationEnabled(true);
+        WebSettings settings = mWebView.getSettings();
+        initializeSettings(settings);
+
+        Matcher matcher = WEBVIEW_VERSION_PATTERN.matcher(settings.getUserAgentString());
+        if (matcher.find()) {
+            mWebViewVersion = matcher.group(2);
+        } else {
+            mWebViewVersion = "-";
+        }
+        setTitle(getResources().getString(R.string.title_activity_browser) + " " + mWebViewVersion);
 
         mWebView.setWebViewClient(new WebViewClient() {
             @Override
@@ -85,6 +109,59 @@ public class WebViewBrowserActivity extends Activity {
         hideKeyboard(mUrlBar);
     }
 
+    public void showPopup(View v) {
+        PopupMenu popup = new PopupMenu(this, v);
+        popup.setOnMenuItemClickListener(this);
+        popup.inflate(R.menu.main_menu);
+        popup.show();
+    }
+
+    @Override
+    public boolean onMenuItemClick(MenuItem item) {
+        switch(item.getItemId()) {
+            case R.id.menu_about:
+                about();
+                hideKeyboard(mUrlBar);
+                return true;
+            default:
+                return false;
+        }
+    }
+
+    private void initializeSettings(WebSettings settings) {
+        settings.setJavaScriptEnabled(true);
+        settings.setGeolocationEnabled(true);
+    }
+
+    private void about() {
+        WebSettings settings = mWebView.getSettings();
+        StringBuilder summary = new StringBuilder();
+        summary.append("WebView version : " + mWebViewVersion + "\n");
+
+        for (Method method : settings.getClass().getMethods()) {
+            if (!methodIsSimpleInspector(method)) continue;
+            try {
+                summary.append(method.getName() + " : " + method.invoke(settings) + "\n");
+            } catch (IllegalAccessException e) {
+            } catch (InvocationTargetException e) { }
+        }
+
+        AlertDialog dialog = new AlertDialog.Builder(this)
+                .setTitle(getResources().getString(R.string.menu_about))
+                .setMessage(summary)
+                .setPositiveButton("OK", null)
+                .create();
+        dialog.show();
+        dialog.getWindow().setLayout(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT);
+    }
+
+    // Returns true is a method has no arguments and returns either a boolean or a String.
+    private boolean methodIsSimpleInspector(Method method) {
+        Class<?> returnType = method.getReturnType();
+        return ((returnType.equals(boolean.class) || returnType.equals(String.class))
+                && method.getParameterTypes().length == 0);
+    }
+
     private void loadUrl(String url) {
         mWebView.loadUrl(url);
         mWebView.requestFocus();