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 MyCloudFragment extends Fragment { 35 36 private static final String TAG = "MyCloudFragment"; 37 private static final String AUTHORITY = "com.example.android.storageprovider.documents"; 38 private boolean mLoggedIn = false; 39 40 @Override 41 public void onCreate(Bundle savedInstanceState) { 42 super.onCreate(savedInstanceState); 43 mLoggedIn = readLoginValue(); 44 45 setHasOptionsMenu(true); 46 } 47 48 @Override 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 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 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); 68 } 69 return true; 70 } 71 72 /** 73 * Dummy function to change the user's authorization status. 74 */ 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 */ 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 */ 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