High-Priced HelpStep #2: Create the Alarm BroadcastReceiver.................................
Next, we need to create a Java object from a public class with a public
method that we can inject into the Javascript environment of our WebView
that will give us access to the user's idenit.ca screen name.
To that end, add the following inner class to HelpPage:
public class CustomHelp {
SharedPreferences prefs=null;CustomHelp() {
prefs=PreferenceManager
.getDefaultSharedPreferences(HelpPage.this);
}public String getUserName() {
return(prefs.getString("user", "<no account>"));
}
}Step #3: Doing the Work....................................................................
Just because we created the CustomHelp inner class does not mean Javascript
has access to it. Instead, we need to give the WebView an instance of
CustomHelp and associate it with a name that will be used to make the
CustomHelp instance look like a global variable in Javascript.
Add the following lines to onCreate() in HelpPage:
browser.addJavascriptInterface(new CustomHelp(),
"customHelp");The entirety of onCreate() in HelpPage should now look like this:
@Override
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
setContentView(R.layout.help);browser=(WebView)findViewById(R.id.webkit);
browser.getSettings().setJavaScriptEnabled(true);
browser.addJavascriptInterface(new CustomHelp(),