content: /*
   * Copyright (C) 2015 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.bluetoothadvertisements;
  
  import android.bluetooth.le.AdvertiseCallback;
  import android.content.BroadcastReceiver;
  import android.content.Context;
  import android.content.Intent;
  import android.content.IntentFilter;
  import android.os.Bundle;
  import android.support.v4.app.Fragment;
  import android.view.LayoutInflater;
  import android.view.View;
  import android.view.ViewGroup;
  import android.widget.Switch;
  import android.widget.Toast;
  
  /**
   * Allows user to start & stop Bluetooth LE Advertising of their device.
   */
  public class AdvertiserFragment extends Fragment implements View.OnClickListener {
  
      /**
       * Lets user toggle BLE Advertising.
       */
      private Switch mSwitch;
  
      /**
       * Listens for notifications that the {@code AdvertiserService} has failed to start advertising.
       * This Receiver deals with Fragment UI elements and only needs to be active when the Fragment
       * is on-screen, so it's defined and registered in code instead of the Manifest.
       */
      private BroadcastReceiver advertisingFailureReceiver;
  
      @Override
      public void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
  
          advertisingFailureReceiver = new BroadcastReceiver() {
  
              /**
               * Receives Advertising error codes from {@code AdvertiserService} and displays error messages
               * to the user. Sets the advertising toggle to 'false.'
               */
              @Override
              public void onReceive(Context context, Intent intent) {
  
                  int errorCode = intent.getIntExtra(AdvertiserService.ADVERTISING_FAILED_EXTRA_CODE, -1);
  
                  mSwitch.setChecked(false);
  
                  String errorMessage = getString(R.string.start_error_prefix);
                  switch (errorCode) {
                      case AdvertiseCallback.ADVERTISE_FAILED_ALREADY_STARTED:
                          errorMessage += " " + getString(R.string.start_error_already_started);
                          break;
                      case AdvertiseCallback.ADVERTISE_FAILED_DATA_TOO_LARGE:
                          errorMessage += " " + getString(R.string.start_error_too_large);
                          break;
                      case AdvertiseCallback.ADVERTISE_FAILED_FEATURE_UNSUPPORTED:
                          errorMessage += " " + getString(R.string.start_error_unsupported);
                          break;
                      case AdvertiseCallback.ADVERTISE_FAILED_INTERNAL_ERROR:
                          errorMessage += " " + getString(R.string.start_error_internal);
                          break;
                      case AdvertiseCallback.ADVERTISE_FAILED_TOO_MANY_ADVERTISERS:
                          errorMessage += " " + getString(R.string.start_error_too_many);
                          break;
                      case AdvertiserService.ADVERTISING_TIMED_OUT:
                          errorMessage = " " + getString(R.string.advertising_timedout);
                          break;
                      default:
                          errorMessage += " " + getString(R.string.start_error_unknown);
                  }
  
                  Toast.makeText(getActivity(), errorMessage, Toast.LENGTH_LONG).show();
              }
          };
      }
  
      @Override
      public View onCreateView(LayoutInflater inflater, ViewGroup container,
                               Bundle savedInstanceState) {
  
          View view = inflater.inflate(R.layout.fragment_advertiser, container, false);
  
          mSwitch = (Switch) view.findViewById(R.id.advertise_switch);
          mSwitch.setOnClickListener(this);
  
          return view;
      }
  
      /**
       * When app comes on screen, check if BLE Advertisements are running, set switch accordingly,
       * and register the Receiver to be notified if Advertising fails.
       */
      @Override
      public void onResume() {
          super.onResume();
  
          if (AdvertiserService.running) {
              mSwitch.setChecked(true);
          } else {
              mSwitch.setChecked(false);
          }
  
          IntentFilter failureFilter = new IntentFilter(AdvertiserService.ADVERTISING_FAILED);
          getActivity().registerReceiver(advertisingFailureReceiver, failureFilter);
  
      }
  
      /**
       * When app goes off screen, unregister the Advertising failure Receiver to stop memory leaks.
       * (and because the app doesn't care if Advertising fails while the UI isn't active)
       */
      @Override
      public void onPause() {
          super.onPause();
          getActivity().unregisterReceiver(advertisingFailureReceiver);
      }
  
      /**
       * Returns Intent addressed to the {@code AdvertiserService} class.
       */
      private static Intent getServiceIntent(Context c) {
          return new Intent(c, AdvertiserService.class);
      }
  
      /**
       * Called when switch is toggled - starts or stops advertising.
       */
      @Override
      public void onClick(View v) {
          // Is the toggle on?
          boolean on = ((Switch) v).isChecked();
  
          if (on) {
              startAdvertising();
          } else {
              stopAdvertising();
          }
      }
  
      /**
       * Starts BLE Advertising by starting {@code AdvertiserService}.
       */
      private void startAdvertising() {
          Context c = getActivity();
          c.startService(getServiceIntent(c));
      }
  
      /**
       * Stops BLE Advertising by stopping {@code AdvertiserService}.
       */
      private void stopAdvertising() {
          Context c = getActivity();
          c.stopService(getServiceIntent(c));
          mSwitch.setChecked(false);
      }
  
  }