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package com.livio.sdltester;
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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