Add user selectable Default Browser feature

- add Default Apps section in Apps / Advanced
- follow UX spec

This change depends on a Framework change which adds new APIs in PackageMaager
for setting and getting the default Browser App package name.

See bug #20144393

Change-Id: I2ff456eeaced9f740f4dd6fb6bccea6de6ea1308

src/com/android/settings/applications/DefaultBrowserPreference.java

@@ -0,0 +1,81 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.applications;
+
+import android.content.Context;
+import android.content.Intent;
+import android.content.pm.PackageManager;
+import android.content.pm.ResolveInfo;
+import android.net.Uri;
+import android.os.UserHandle;
+import android.preference.ListPreference;
+import android.util.ArrayMap;
+import android.util.AttributeSet;
+
+import com.android.settings.R;
+
+import java.util.List;
+
+public class DefaultBrowserPreference extends ListPreference {
+
+    final private PackageManager mPm;
+
+    public DefaultBrowserPreference(Context context, AttributeSet attrs) {
+        super(context, attrs);
+
+        mPm = context.getPackageManager();
+        loadBrowserApps();
+    }
+
+    private void loadBrowserApps() {
+        ArrayMap<String, CharSequence> browsers = resolveBrowserApps();
+
+        setEntries(browsers.values().toArray(new CharSequence[browsers.size()]));
+        setEntryValues(browsers.keySet().toArray(new String[browsers.size()]));
+    }
+
+    private ArrayMap<String, CharSequence> resolveBrowserApps() {
+        ArrayMap<String, CharSequence> result = new ArrayMap<>();
+
+        // Create an Intent that will match ALL Browser Apps
+        Intent intent = new Intent();
+        intent.setAction(Intent.ACTION_VIEW);
+        intent.addCategory(Intent.CATEGORY_BROWSABLE);
+        intent.setData(Uri.parse("http:"));
+
+        // Resolve that intent and check that the handleAllWebDataURI boolean is set
+        PackageManager packageManager = getContext().getPackageManager();
+        List<ResolveInfo> list = packageManager.queryIntentActivitiesAsUser(intent, 0,
+                UserHandle.myUserId());
+
+        final int count = list.size();
+        for (int i=0; i<count; i++) {
+            ResolveInfo info = list.get(i);
+            if (info.activityInfo == null || result.containsKey(info.activityInfo.packageName)
+                    || !info.handleAllWebDataURI) {
+                continue;
+            }
+
+            String packageName = info.activityInfo.packageName;
+            CharSequence label = info.activityInfo.applicationInfo.loadLabel(packageManager);
+
+            result.put(packageName, label);
+        }
+
+        return result;
+    }
+}