Adding internal method replacePreferredActivity.

This was required because we need a way to set the preferred activity for a
particular intent filter based on user selection (in our case the
ACTION_WEB_SEARCH intent filter for selecting the preferred search engine from
the list of available search engines providers). The current
addPreferredActivity call was not sufficient since it leaves the existing
preferred activities in the list and does not remove them, which this call
does.

core/java/android/app/ApplicationContext.java

@@ -2424,6 +2424,16 @@ class ApplicationContext extends Context {
             }
         }
         
+        @Override
+        public void replacePreferredActivity(IntentFilter filter,
+                int match, ComponentName[] set, ComponentName activity) {
+            try {
+                mPM.replacePreferredActivity(filter, match, set, activity);
+            } catch (RemoteException e) {
+                // Should never happen!
+            }
+        }
+
         @Override
         public void clearPackagePreferredActivities(String packageName) {
             try {

core/java/android/content/pm/IPackageManager.aidl

@@ -167,7 +167,12 @@ interface IPackageManager {
 
     void addPreferredActivity(in IntentFilter filter, int match,
             in ComponentName[] set, in ComponentName activity);
+
+    void replacePreferredActivity(in IntentFilter filter, int match,
+            in ComponentName[] set, in ComponentName activity);
+
     void clearPackagePreferredActivities(String packageName);
+
     int getPreferredActivities(out List<IntentFilter> outFilters,
             out List<ComponentName> outActivities, String packageName);
     

core/java/android/content/pm/PackageManager.java

@@ -1629,6 +1629,26 @@ public abstract class PackageManager {
     public abstract void addPreferredActivity(IntentFilter filter, int match,
             ComponentName[] set, ComponentName activity);
 
+    /**
+     * Replaces an existing preferred activity mapping to the system, and if that were not present
+     * adds a new preferred activity.  This will be used
+     * to automatically select the given activity component when
+     * {@link Context#startActivity(Intent) Context.startActivity()} finds
+     * multiple matching activities and also matches the given filter.
+     *
+     * @param filter The set of intents under which this activity will be
+     * made preferred.
+     * @param match The IntentFilter match category that this preference
+     * applies to.
+     * @param set The set of activities that the user was picking from when
+     * this preference was made.
+     * @param activity The component name of the activity that is to be
+     * preferred.
+     * @hide
+     */
+    public abstract void replacePreferredActivity(IntentFilter filter, int match,
+            ComponentName[] set, ComponentName activity);
+
     /**
      * Remove all preferred activity mappings, previously added with
      * {@link #addPreferredActivity}, from the

services/java/com/android/server/PackageManagerService.java

@@ -19,6 +19,7 @@ package com.android.server;
 import com.android.internal.app.ResolverActivity;
 import com.android.internal.util.FastXmlSerializer;
 import com.android.internal.util.XmlUtils;
+import com.android.server.PackageManagerService.PreferredActivity;
 
 import org.xmlpull.v1.XmlPullParser;
 import org.xmlpull.v1.XmlPullParserException;
@@ -4507,6 +4508,42 @@ class PackageManagerService extends IPackageManager.Stub {
         }
     }
 
+    public void replacePreferredActivity(IntentFilter filter, int match,
+            ComponentName[] set, ComponentName activity) {
+        mContext.enforceCallingOrSelfPermission(
+                android.Manifest.permission.SET_PREFERRED_APPLICATIONS, null);
+        if (filter.countActions() != 1) {
+            throw new IllegalArgumentException(
+                    "replacePreferredActivity expects filter to have only 1 action.");
+        }
+        if (filter.countCategories() != 1) {
+            throw new IllegalArgumentException(
+                    "replacePreferredActivity expects filter to have only 1 category.");
+        }
+        if (filter.countDataAuthorities() != 0
+                || filter.countDataPaths() != 0
+                || filter.countDataSchemes() != 0
+                || filter.countDataTypes() != 0) {
+            throw new IllegalArgumentException(
+                    "replacePreferredActivity expects filter to have no data authorities, " +
+                    "paths, schemes or types.");
+        }
+        synchronized (mPackages) {
+            Iterator<PreferredActivity> it = mSettings.mPreferredActivities.filterIterator();
+            String action = filter.getAction(0);
+            String category = filter.getCategory(0);
+            while (it.hasNext()) {
+                PreferredActivity pa = it.next();
+                if (pa.getAction(0).equals(action) && pa.getCategory(0).equals(category)) {
+                    it.remove();
+                    Log.i(TAG, "Removed preferred activity " + pa.mActivity + ":");
+                    filter.dump(new LogPrinter(Log.INFO, TAG), "  ");
+                }
+            }
+            addPreferredActivity(filter, match, set, activity);
+        }
+    }
+
     public void clearPackagePreferredActivities(String packageName) {
         mContext.enforceCallingOrSelfPermission(
                 android.Manifest.permission.SET_PREFERRED_APPLICATIONS, null);

test-runner/android/test/mock/MockPackageManager.java

@@ -392,6 +392,16 @@ public class MockPackageManager extends PackageManager {
         throw new UnsupportedOperationException();
     }
     
+    /**
+     * @hide - to match hiding in superclass
+     */
+    @Override
+    public void replacePreferredActivity(IntentFilter filter,
+            int match, ComponentName[] set, ComponentName activity) {
+        throw new UnsupportedOperationException();
+    }
+
+
     @Override
     public void clearPackagePreferredActivities(String packageName) {
         throw new UnsupportedOperationException();