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      1 /*
      2  * Copyright (C) 2011 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.settings.location;
     18 
     19 import android.app.LoaderManager.LoaderCallbacks;
     20 import android.content.Context;
     21 import android.content.CursorLoader;
     22 import android.content.Intent;
     23 import android.content.Loader;
     24 import android.database.Cursor;
     25 import android.os.Bundle;
     26 import android.os.UserManager;
     27 import android.provider.Settings;
     28 import android.util.Log;
     29 
     30 import com.android.settings.SettingsPreferenceFragment;
     31 
     32 /**
     33  * A base class that listens to location settings change and modifies location
     34  * settings.
     35  */
     36 public abstract class LocationSettingsBase extends SettingsPreferenceFragment
     37         implements LoaderCallbacks<Cursor> {
     38     private static final String TAG = "LocationSettingsBase";
     39     /** Broadcast intent action when the location mode is about to change. */
     40     private static final String MODE_CHANGING_ACTION =
     41             "com.android.settings.location.MODE_CHANGING";
     42     private static final String CURRENT_MODE_KEY = "CURRENT_MODE";
     43     private static final String NEW_MODE_KEY = "NEW_MODE";
     44 
     45     private static final int LOADER_ID_LOCATION_MODE = 1;
     46     private int mCurrentMode;
     47 
     48     /**
     49      * Whether the fragment is actively running.
     50      */
     51     private boolean mActive = false;
     52 
     53     @Override
     54     public void onCreate(Bundle icicle) {
     55         super.onCreate(icicle);
     56         getLoaderManager().initLoader(LOADER_ID_LOCATION_MODE, null, this);
     57     }
     58 
     59     @Override
     60     public void onResume() {
     61         super.onResume();
     62         mActive = true;
     63     }
     64 
     65     @Override
     66     public void onPause() {
     67         super.onPause();
     68         mActive = false;
     69     }
     70 
     71     /** Called when location mode has changed. */
     72     public abstract void onModeChanged(int mode, boolean restricted);
     73 
     74     private boolean isRestricted() {
     75         final UserManager um = (UserManager) getActivity().getSystemService(Context.USER_SERVICE);
     76         return um.hasUserRestriction(UserManager.DISALLOW_SHARE_LOCATION);
     77     }
     78 
     79     public void setLocationMode(int mode) {
     80         if (isRestricted()) {
     81             // Location toggling disabled by user restriction. Read the current location mode to
     82             // update the location master switch.
     83             if (Log.isLoggable(TAG, Log.INFO)) {
     84                 Log.i(TAG, "Restricted user, not setting location mode");
     85             }
     86             mode = Settings.Secure.getInt(getContentResolver(), Settings.Secure.LOCATION_MODE,
     87                     Settings.Secure.LOCATION_MODE_OFF);
     88             if (mActive) {
     89                 onModeChanged(mode, true);
     90             }
     91             return;
     92         }
     93         Intent intent = new Intent(MODE_CHANGING_ACTION);
     94         intent.putExtra(CURRENT_MODE_KEY, mCurrentMode);
     95         intent.putExtra(NEW_MODE_KEY, mode);
     96         getActivity().sendBroadcast(intent, android.Manifest.permission.WRITE_SECURE_SETTINGS);
     97         Settings.Secure.putInt(getContentResolver(), Settings.Secure.LOCATION_MODE, mode);
     98         refreshLocationMode();
     99     }
    100 
    101     public void refreshLocationMode() {
    102         if (mActive) {
    103             int mode = Settings.Secure.getInt(getContentResolver(), Settings.Secure.LOCATION_MODE,
    104                     Settings.Secure.LOCATION_MODE_OFF);
    105             mCurrentMode = mode;
    106             onModeChanged(mode, isRestricted());
    107         }
    108     }
    109 
    110     @Override
    111     public Loader<Cursor> onCreateLoader(int id, Bundle args) {
    112         switch (id) {
    113             case LOADER_ID_LOCATION_MODE:
    114                 return new CursorLoader(getActivity(), Settings.Secure.CONTENT_URI, null,
    115                         "(" + Settings.System.NAME + "=?)",
    116                         new String[] { Settings.Secure.LOCATION_MODE }, null);
    117             default:
    118                 return null;
    119         }
    120     }
    121 
    122     @Override
    123     public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
    124         refreshLocationMode();
    125     }
    126 
    127     @Override
    128     public void onLoaderReset(Loader<Cursor> loader) {
    129         // Nothing to do here.
    130     }
    131 }
    132