Android Open Source - sdl_tester_android Help Activity

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License

The source code is released under:

Copyright (c) 2014, Ford Motor Company All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are m...

Java Source Code

package com.livio.sdltester;
//from  ww w . j  a  v a  2  s  .  c om
import java.util.Stack;

import android.app.ActionBar;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Toast;

public class HelpActivity extends Activity {

  public static final String EXTRA_ASSET_FILENAME = "com.livio.sdltester.HelpActivity.extraAssetFilename";
  
  private static final String ASSET_URL_FORMAT = "file:///android_asset/help_docs/html/";
  private static final String INDEX_FILENAME = "index.html";
  
  private WebView webView;
  private Stack<String> urlStack;
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_help);
    
    ActionBar actionBar = getActionBar();
    if(actionBar != null){
      actionBar.setTitle("SDL Help");
    }
    
    urlStack = new Stack<String>();
    
    webView = (WebView) findViewById(R.id.wv_help);
    webView.setWebViewClient(new WebViewClient(){
      @Override
      public void onPageStarted(WebView view, String url, Bitmap favicon) {
        super.onPageStarted(view, url, favicon);
        urlStack.push(url);
      }

      @Override
      public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
        Toast.makeText(HelpActivity.this, "An error occurred.", Toast.LENGTH_LONG).show();
        
        // the current URL didn't work, so remove it from the url stack
        urlStack.pop();
      }
      
    });
    
    Intent incomingIntent = getIntent();
    if(incomingIntent.hasExtra(EXTRA_ASSET_FILENAME)){
      String fileName = incomingIntent.getStringExtra(EXTRA_ASSET_FILENAME);
      if(fileName != null && fileName.length() > 0){
        navigateToFileName(fileName);
      }
      else{
        navigateToIndex();
      }
    }
    else{
      navigateToIndex();
    }
  }
  
  private void navigateToFileName(String fileName){
    webView.loadUrl(makeUrl(fileName));
  }
  
  private void navigateToIndex(){
    webView.loadUrl(makeUrl(INDEX_FILENAME));
  }
  
  @Override
  public void onBackPressed() {
    if(urlStack == null || urlStack.size() <= 1){
      // if something went awry with the stack or if we're back at index when back is pressed, we'll just finish the activity
      finish();
    }
    else{
      // since we are going back, we don't need the current URL anymore
      urlStack.pop();
      
      // retrieve the last-visited page (it will be added back to the stack automatically when the page loads)
      String urlToLoad = urlStack.pop();
      webView.loadUrl(urlToLoad);
    }
  }

  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
    MenuInflater inflater = getMenuInflater();
    inflater.inflate(R.menu.menu_help, menu);
    return true;
  }

  @Override
  public boolean onPrepareOptionsMenu(Menu menu) {
    android.view.MenuItem helpHome = (android.view.MenuItem) menu.findItem(R.id.menu_help_home);
    
    // show/hide connect/disconnect menu items
    boolean atIndex = (urlStack == null || urlStack.size() <= 1);
    helpHome.setVisible(!atIndex); // if we're not at the index, show the home button
    
    return true;
  }

  @Override
  public boolean onOptionsItemSelected(android.view.MenuItem item) {
    int menuItemId = item.getItemId();
    switch(menuItemId){
    case R.id.menu_help_home:
      urlStack.clear();
      navigateToIndex();
      return true;
    case R.id.menu_help_close:
      finish();
      return true;
    default:
      return super.onOptionsItemSelected(item);
    }
  }

  private static String makeUrl(String fileName){
    return new StringBuilder().append(ASSET_URL_FORMAT).append(fileName).toString();
  }

}

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