content: /*
   * Copyright 2013 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.example.android.storageprovider;
  
  import android.content.SharedPreferences;
  import android.os.Bundle;
  import android.provider.DocumentsContract;
  
  import androidx.fragment.app.Fragment;
  
  import android.view.Menu;
  import android.view.MenuItem;
  
  import com.example.android.common.logger.Log;
  
  /**
   * Toggles the user's login status via a login menu option, and enables/disables the cloud storage
   * content provider.
   */
  public class StorageProviderFragment extends Fragment {
  
      private static final String TAG = "StorageProviderFragment";
      private static final String AUTHORITY = "com.example.android.storageprovider.documents";
      private boolean mLoggedIn = false;
  
      @Override
      public void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          mLoggedIn = readLoginValue();
  
          setHasOptionsMenu(true);
      }
  
      @Override
      public void onPrepareOptionsMenu(Menu menu) {
          super.onPrepareOptionsMenu(menu);
          MenuItem item = menu.findItem(R.id.sample_action);
          item.setTitle(mLoggedIn ? R.string.log_out : R.string.log_in);
      }
  
      @Override
      public boolean onOptionsItemSelected(MenuItem item) {
          if (item.getItemId() == R.id.sample_action) {
              toggleLogin();
              item.setTitle(mLoggedIn ? R.string.log_out : R.string.log_in);
  
              // BEGIN_INCLUDE(notify_change)
              // Notify the system that the status of our roots has changed.  This will trigger
              // a call to MyCloudProvider.queryRoots() and force a refresh of the system
              // picker UI.  It's important to call this or stale results may persist.
              getActivity().getContentResolver().notifyChange(DocumentsContract.buildRootsUri
                      (AUTHORITY), null, false);
              // END_INCLUDE(notify_change)
          }
          return true;
      }
  
      /**
       * Dummy function to change the user's authorization status.
       */
      private void toggleLogin() {
          // Replace this with your standard method of authentication to determine if your app
          // should make the user's documents available.
          mLoggedIn = !mLoggedIn;
          writeLoginValue(mLoggedIn);
          Log.i(TAG, getString(mLoggedIn ? R.string.logged_in_info : R.string.logged_out_info));
      }
  
      /**
       * Dummy function to save whether the user is logged in.
       */
      private void writeLoginValue(boolean loggedIn) {
          final SharedPreferences sharedPreferences =
                  getActivity().getSharedPreferences(getString(R.string.app_name),
                          getActivity().MODE_PRIVATE);
          sharedPreferences.edit().putBoolean(getString(R.string.key_logged_in), loggedIn).commit();
      }
  
      /**
       * Dummy function to determine whether the user is logged in.
       */
      private boolean readLoginValue() {
          final SharedPreferences sharedPreferences =
                  getActivity().getSharedPreferences(getString(R.string.app_name),
                          getActivity().MODE_PRIVATE);
          return sharedPreferences.getBoolean(getString(R.string.key_logged_in), false);
      }
  
  }
  
  
  