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.BluetoothAdapter;
  import android.bluetooth.BluetoothManager;
  import android.content.Context;
  import android.content.Intent;
  import android.os.Bundle;
  import android.support.v4.app.FragmentActivity;
  import android.support.v4.app.FragmentTransaction;
  import android.widget.TextView;
  import android.widget.Toast;
  
  /**
   * Setup display fragments and ensure the device supports Bluetooth.
   */
  public class MainActivity extends FragmentActivity {
  
      private BluetoothAdapter mBluetoothAdapter;
  
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_main);
          setTitle(R.string.activity_main_title);
  
          if (savedInstanceState == null) {
  
              mBluetoothAdapter = ((BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE))
                      .getAdapter();
  
              // Is Bluetooth supported on this device?
              if (mBluetoothAdapter != null) {
  
                  // Is Bluetooth turned on?
                  if (mBluetoothAdapter.isEnabled()) {
  
                      // Are Bluetooth Advertisements supported on this device?
                      if (mBluetoothAdapter.isMultipleAdvertisementSupported()) {
  
                          // Everything is supported and enabled, load the fragments.
                          setupFragments();
  
                      } else {
  
                          // Bluetooth Advertisements are not supported.
                          showErrorText(R.string.bt_ads_not_supported);
                      }
                  } else {
  
                      // Prompt user to turn on Bluetooth (logic continues in onActivityResult()).
                      Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
                      startActivityForResult(enableBtIntent, Constants.REQUEST_ENABLE_BT);
                  }
              } else {
  
                  // Bluetooth is not supported.
                  showErrorText(R.string.bt_not_supported);
              }
          }
      }
  
      @Override
      protected void onActivityResult(int requestCode, int resultCode, Intent data) {
          super.onActivityResult(requestCode, resultCode, data);
          switch (requestCode) {
              case Constants.REQUEST_ENABLE_BT:
  
                  if (resultCode == RESULT_OK) {
  
                      // Bluetooth is now Enabled, are Bluetooth Advertisements supported on
                      // this device?
                      if (mBluetoothAdapter.isMultipleAdvertisementSupported()) {
  
                          // Everything is supported and enabled, load the fragments.
                          setupFragments();
  
                      } else {
  
                          // Bluetooth Advertisements are not supported.
                          showErrorText(R.string.bt_ads_not_supported);
                      }
                  } else {
  
                      // User declined to enable Bluetooth, exit the app.
                      Toast.makeText(this, R.string.bt_not_enabled_leaving,
                              Toast.LENGTH_SHORT).show();
                      finish();
                  }
  
              default:
                  super.onActivityResult(requestCode, resultCode, data);
          }
      }
  
      private void setupFragments() {
          FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
  
          ScannerFragment scannerFragment = new ScannerFragment();
          // Fragments can't access system services directly, so pass it the BluetoothAdapter
          scannerFragment.setBluetoothAdapter(mBluetoothAdapter);
          transaction.replace(R.id.scanner_fragment_container, scannerFragment);
  
          AdvertiserFragment advertiserFragment = new AdvertiserFragment();
          transaction.replace(R.id.advertiser_fragment_container, advertiserFragment);
  
          transaction.commit();
      }
  
      private void showErrorText(int messageId) {
  
          TextView view = (TextView) findViewById(R.id.error_textview);
          view.setText(getString(messageId));
      }
  }