1 /*
2 * Copyright 2013 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 
18 package com.example.android.storageprovider;
19 
20 
21 import android.content.SharedPreferences;
22 import android.os.Bundle;
23 import android.provider.DocumentsContract;
24 import android.support.v4.app.Fragment;
25 import android.view.Menu;
26 import android.view.MenuItem;
27 
28 import com.example.android.common.logger.Log;
29 
30 /**
31  * Toggles the user's login status via a login menu option, and enables/disables the cloud storage
32  * content provider.
33  */
34 public class StorageProviderFragment extends Fragment {
35 
36     private static final String TAG = "StorageProviderFragment";
37     private static final String AUTHORITY = "com.example.android.storageprovider.documents";
38     private boolean mLoggedIn = false;
39 
40     @Override
onCreate(Bundle savedInstanceState)41     public void onCreate(Bundle savedInstanceState) {
42         super.onCreate(savedInstanceState);
43         mLoggedIn = readLoginValue();
44 
45         setHasOptionsMenu(true);
46     }
47 
48     @Override
onPrepareOptionsMenu(Menu menu)49     public void onPrepareOptionsMenu(Menu menu) {
50         super.onPrepareOptionsMenu(menu);
51         MenuItem item = menu.findItem(R.id.sample_action);
52         item.setTitle(mLoggedIn ? R.string.log_out : R.string.log_in);
53     }
54 
55     @Override
onOptionsItemSelected(MenuItem item)56     public boolean onOptionsItemSelected(MenuItem item) {
57         if (item.getItemId() == R.id.sample_action) {
58             toggleLogin();
59             item.setTitle(mLoggedIn ? R.string.log_out : R.string.log_in);
60 
61             // BEGIN_INCLUDE(notify_change)
62             // Notify the system that the status of our roots has changed.  This will trigger
63             // a call to MyCloudProvider.queryRoots() and force a refresh of the system
64             // picker UI.  It's important to call this or stale results may persist.
65             getActivity().getContentResolver().notifyChange(DocumentsContract.buildRootsUri
66                     (AUTHORITY), null, false);
67             // END_INCLUDE(notify_change)
68         }
69         return true;
70     }
71 
72     /**
73      * Dummy function to change the user's authorization status.
74      */
toggleLogin()75     private void toggleLogin() {
76         // Replace this with your standard method of authentication to determine if your app
77         // should make the user's documents available.
78         mLoggedIn = !mLoggedIn;
79         writeLoginValue(mLoggedIn);
80         Log.i(TAG, getString(mLoggedIn ? R.string.logged_in_info : R.string.logged_out_info));
81     }
82 
83     /**
84      * Dummy function to save whether the user is logged in.
85      */
writeLoginValue(boolean loggedIn)86     private void writeLoginValue(boolean loggedIn) {
87         final SharedPreferences sharedPreferences =
88                 getActivity().getSharedPreferences(getString(R.string.app_name),
89                         getActivity().MODE_PRIVATE);
90         sharedPreferences.edit().putBoolean(getString(R.string.key_logged_in), loggedIn).commit();
91     }
92 
93     /**
94      * Dummy function to determine whether the user is logged in.
95      */
readLoginValue()96     private boolean readLoginValue() {
97         final SharedPreferences sharedPreferences =
98                 getActivity().getSharedPreferences(getString(R.string.app_name),
99                         getActivity().MODE_PRIVATE);
100         return sharedPreferences.getBoolean(getString(R.string.key_logged_in), false);
101     }
102 
103 }
104 
105 
106