package com.example.localbrowser;

/***
 * Excerpted from "Hello, Android",
 * published by The Pragmatic Bookshelf.
 * Copyrights apply to this code. It may not be used to create training material, 
 * courses, books, articles, and the like. Contact us if you are in doubt.
 * We make no guarantees that this code is fit for any purpose. 
 * Visit http://www.pragmaticprogrammer.com/titles/eband3 for more book information.
 ***/

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.webkit.JsResult;
import android.webkit.WebChromeClient;
import android.webkit.WebView;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

public class LocalBrowser extends Activity {
	private static final String TAG = "LocalBrowser";
	final Handler handler = new Handler();
	private WebView webView;
	private TextView textView;
	private Button button;

	/** Object exposed to JavaScript */
	public class AndroidBridge {

		Context mContext;

		public void showToast(String inArg) { // must be final
			final String arg = inArg;
			handler.post(new Runnable() {
				@Override
				public void run() {
					// Log.d(TAG, "callAndroid(" + arg + ")");
					textView.setText(arg);
				}
			});

			Toast.makeText(mContext, arg, Toast.LENGTH_SHORT).show();
		}
	}

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);

		// Find the Android controls on the screen
		webView = (WebView) findViewById(R.id.web_view);
		textView = (TextView) findViewById(R.id.text_view);
		button = (Button) findViewById(R.id.button);
		// Rest of onCreate follows...

		// Turn on JavaScript in the embedded browser
		webView.getSettings().setJavaScriptEnabled(true);

		final AndroidBridge mBridge = new AndroidBridge();
		// Expose a Java object to JavaScript in the browser
		webView.addJavascriptInterface(mBridge, "AndroidFunction");

		// Set up a function to be called when JavaScript tries
		// to open an alert window
		webView.setWebChromeClient(new WebChromeClient() {
			@Override
			public boolean onJsAlert(final WebView view, final String url,
					final String message, JsResult result) {
				Log.d(TAG, "onJsAlert(" + view + ", " + url + ", " + message
						+ ", " + result + ")");
				Toast.makeText(LocalBrowser.this, message, 3000).show();
				result.confirm();
				return true; // I handled it
			}
		});

		// Load the web page from a local asset
		webView.loadUrl("file:///android_asset/index.html");

		// This function will be called when the user presses the
		// button on the Android side
		button.setOnClickListener(new OnClickListener() {
			/*
			 * (non-Javadoc)
			 * 
			 * @see android.view.View.OnClickListener#onClick(android.view.View)
			 */
			public void onClick(View view) {

				Log.d(TAG, "onClick(" + view + ")");
				webView.loadUrl("javascript:callJS('Hello from Android')");
			}
		});
	}
}