Add getDefaultUserAgent to WebSettings.

 Bug 6329117
 Add ability to get the default user-agent without creating
 a WebView. The method is implemented for WebSettingsClassic.

Change-Id: Id15fb57f65875752ccf644481a22b88644635f5d

Author: George Mount

api/current.txt

@@ -26927,6 +26927,7 @@ package android.webkit {
     method public synchronized boolean getUseWideViewPort();
     method public deprecated synchronized int getUserAgent();
     method public synchronized java.lang.String getUserAgentString();
+    method public static java.lang.String getDefaultUserAgent(android.content.Context);
     method public void setAllowContentAccess(boolean);
     method public void setAllowFileAccess(boolean);
     method public abstract void setAllowFileAccessFromFileURLs(boolean);

core/java/android/webkit/WebSettings.java

@@ -16,6 +16,7 @@
 
 package android.webkit;
 
+import android.content.Context;
 import android.os.Message;
 import android.os.Build;
 
@@ -1225,6 +1226,18 @@ public synchronized String getUserAgentString() {
         throw new MustOverrideException();
     }
 
+    /**
+     * Returns the default User-Agent used by a WebView.
+     * An instance of WebView could use a different User-Agent if a call
+     * is made to {@link WebSettings#setUserAgent(int)} or
+     * {@link WebSettings#setUserAgentString(String)}.
+     *
+     * @param context a Context object used to access application assets
+     */
+    public static String getDefaultUserAgent(Context context) {
+        return WebView.getFactory().getDefaultUserAgent(context);
+    }
+
     /**
      * Tells the WebView whether it needs to set a node to have focus when
      * {@link WebView#requestFocus(int, android.graphics.Rect)} is called. The

core/java/android/webkit/WebSettingsClassic.java

@@ -374,6 +374,21 @@ private synchronized String getCurrentUserAgent() {
         synchronized(sLockForLocaleSettings) {
             locale = sLocale;
         }
+        return getDefaultUserAgentForLocale(mContext, locale);
+    }
+
+    /**
+     * Returns the default User-Agent used by a WebView.
+     * An instance of WebView could use a different User-Agent if a call
+     * is made to {@link WebSettings#setUserAgent(int)} or
+     * {@link WebSettings#setUserAgentString(String)}.
+     *
+     * @param context a Context object used to access application assets
+     * @param locale The Locale to use in the User-Agent string.
+     * @see WebViewFactoryProvider#getDefaultUserAgent(Context)
+     * @see WebView#getDefaultUserAgent(Context)
+     */
+    public static String getDefaultUserAgentForLocale(Context context, Locale locale) {
         StringBuffer buffer = new StringBuffer();
         // Add version
         final String version = Build.VERSION.RELEASE;
@@ -417,9 +432,9 @@ private synchronized String getCurrentUserAgent() {
             buffer.append(" Build/");
             buffer.append(id);
         }
-        String mobile = mContext.getResources().getText(
+        String mobile = context.getResources().getText(
             com.android.internal.R.string.web_user_agent_target_content).toString();
-        final String base = mContext.getResources().getText(
+        final String base = context.getResources().getText(
                 com.android.internal.R.string.web_user_agent).toString();
         return String.format(base, buffer, mobile);
     }

core/java/android/webkit/WebView.java

@@ -1821,7 +1821,7 @@ private void ensureProviderCreated() {
         }
     }
 
-    private static synchronized WebViewFactoryProvider getFactory() {
+    static synchronized WebViewFactoryProvider getFactory() {
         // For now the main purpose of this function (and the factory abstration) is to keep
         // us honest and minimize usage of WebViewClassic internals when binding the proxy.
         checkThread();

core/java/android/webkit/WebViewClassic.java

@@ -132,6 +132,7 @@
 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.List;
+import java.util.Locale;
 import java.util.Map;
 import java.util.Set;
 import java.util.Vector;
@@ -1308,6 +1309,12 @@ public WebStorage getWebStorage() {
         public WebViewDatabase getWebViewDatabase(Context context) {
             return WebViewDatabaseClassic.getInstance(context);
         }
+
+        @Override
+        public String getDefaultUserAgent(Context context) {
+            return WebSettingsClassic.getDefaultUserAgentForLocale(context,
+                    Locale.getDefault());
+        }
     }
 
     private void onHandleUiEvent(MotionEvent event, int eventType, int flags) {

core/java/android/webkit/WebViewFactoryProvider.java

@@ -93,4 +93,14 @@ interface Statics {
      * @return the singleton WebViewDatabase instance
      */
     WebViewDatabase getWebViewDatabase(Context context);
+
+    /**
+     * Returns the default User-Agent used by a WebView.
+     * An instance of WebView could use a different User-Agent if a call
+     * is made to {@link WebSettings#setUserAgent(int)} or
+     * {@link WebSettings#setUserAgentString(String)}.
+     *
+     * @param context a Context object used to access application assets
+     */
+    String getDefaultUserAgent(Context context);
 }