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      1 /*
      2  * Copyright (C) 2009 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.contacts.preference;
     18 
     19 import android.app.ActionBar;
     20 import android.content.Context;
     21 import android.content.Intent;
     22 import android.os.Bundle;
     23 import android.preference.PreferenceActivity;
     24 import android.view.MenuItem;
     25 
     26 import com.android.contacts.R;
     27 import com.android.contacts.activities.PeopleActivity;
     28 
     29 import java.util.List;
     30 
     31 /**
     32  * Contacts settings.
     33  */
     34 public final class ContactsPreferenceActivity extends PreferenceActivity {
     35 
     36     @Override
     37     protected void onCreate(Bundle savedInstanceState) {
     38         super.onCreate(savedInstanceState);
     39 
     40         // This Activity will always fall back to the "top" Contacts screen when touched on the
     41         // app up icon, regardless of launch context.
     42         ActionBar actionBar = getActionBar();
     43         if (actionBar != null) {
     44             actionBar.setDisplayOptions(ActionBar.DISPLAY_HOME_AS_UP, ActionBar.DISPLAY_HOME_AS_UP);
     45         }
     46     }
     47 
     48     /**
     49      * Populate the activity with the top-level headers.
     50      */
     51     @Override
     52     public void onBuildHeaders(List<Header> target) {
     53         loadHeadersFromResource(R.xml.preference_headers, target);
     54     }
     55 
     56     /**
     57      * Returns true if there are no preferences to display and therefore the
     58      * corresponding menu item can be removed.
     59      */
     60     public static boolean isEmpty(Context context) {
     61         return !context.getResources().getBoolean(R.bool.config_sort_order_user_changeable)
     62                 && !context.getResources().getBoolean(R.bool.config_display_order_user_changeable);
     63     }
     64 
     65     @Override
     66     public boolean onOptionsItemSelected(MenuItem item) {
     67         switch (item.getItemId()) {
     68             case android.R.id.home: {
     69                 Intent intent = new Intent(this, PeopleActivity.class);
     70                 intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
     71                 startActivity(intent);
     72                 finish();
     73                 return true;
     74             }
     75         }
     76         return false;
     77     }
     78 
     79     @Override
     80     protected boolean isValidFragment(String fragmentName) {
     81         return true;
     82     }
     83 }
     84