code: /*
   * Copyright 2014 Google Inc. All rights reserved.
   *
   * 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 org.physical_web.physicalweb;
  
  import android.annotation.SuppressLint;
  import android.content.Intent;
  import android.os.Bundle;
  import android.support.v7.app.AppCompatActivity;
  import android.view.Menu;
  import android.view.View;
  import android.webkit.WebView;
  import android.webkit.WebViewClient;
  
  /**
   * The out of the box activity that let's the user know what this app is all about.
   */
  public class OobActivity extends AppCompatActivity {
  
    View.OnClickListener mAcceptButtonOnClickListener = new View.OnClickListener() {
  
      @Override
      public void onClick(View v) {
        // Save the opt in preference
        Utils.setOptInPreference(OobActivity.this);
  
        // Exit the activity
        finish();
      }
    };
  
    @SuppressLint("SetJavaScriptEnabled")
    private void initializeWebView() {
      WebView webView = (WebView) findViewById(R.id.oob_webview);
      // Force the background color to update (it uses the color specified in the layout xml)
      webView.setBackgroundColor(0x000);
      webView.getSettings().setJavaScriptEnabled(true);
      webView.setWebViewClient(new WebViewClient());
      webView.loadUrl(getString(R.string.url_getting_started));
    }
  
    @Override
    protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_oob);
      findViewById(R.id.oob_accept_button).setOnClickListener(mAcceptButtonOnClickListener);
      initializeWebView();
    }
  
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
      // Inflate the menu; this adds items to the action bar if it is present.
      getMenuInflater().inflate(R.menu.menu_oob, menu);
      return true;
    }
  
    @Override
    public void onBackPressed() {
      super.onBackPressed();
      // Make sure that the back button brings the user to the home screen
      Intent intent = new Intent(Intent.ACTION_MAIN);
      intent.addCategory(Intent.CATEGORY_HOME);
      startActivity(intent);
    }
  }
  