MainActivity.java

/**
 * Copyright (C) 2015 Monitordroid Inc.
 *
 * 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.
 * 
 * @author Tyler Butler
 **/

package com.monitordroid.app;

import static com.monitordroid.app.CommonUtilities.DISPLAY_MESSAGE_ACTION;
import static com.monitordroid.app.CommonUtilities.EXTRA_MESSAGE;
import static com.monitordroid.app.CommonUtilities.SENDER_ID;
import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.SharedPreferences;
import android.os.AsyncTask;
import android.os.Bundle;
import android.widget.TextView;

import com.google.android.gcm.GCMRegistrar;

public class MainActivity extends Activity {

	TextView lblMessage;
	AsyncTask<Void, Void, Void> mRegisterTask;
	AlertDialogManager alert = new AlertDialogManager();
	// Shared preference to save account name and devicename for later access
	public static final String PREFS_NAME = "MyPrefsFile";

	ConnectionDetector cd;
	public static String name;
	public static String email;

	/**
	 * This activity is created when the "Register" button is clicked from
	 * RegisterActivity.java
	 * 
	 * Handles registering for a GCM ID, internet connectivity issues, and calls
	 * the method to register the device on the Monitordroid server
	 */
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		cd = new ConnectionDetector(getApplicationContext());

		// Check if able to connect to the internet
		if (!cd.isConnectingToInternet()) {
			// Internet Connection is not present
			alert.showAlertDialog(MainActivity.this,
					"Internet Connection Error",
					"Please connect to working Internet connection", false);
			return;
		}

		// Getting name, email from intent
		Intent i = getIntent();

		// Here are the "Unique Device Name" and "Account Email" fields input by
		// the user on the screen before
		name = i.getStringExtra("name");
		email = i.getStringExtra("email");

		// Make sure the device has the proper dependencies
		GCMRegistrar.checkDevice(this);
		GCMRegistrar.checkManifest(this);

		lblMessage = (TextView) findViewById(R.id.lblMessage);

		registerReceiver(mHandleMessageReceiver, new IntentFilter(
				DISPLAY_MESSAGE_ACTION));

		// Get GCM registration id
		final String regId = GCMRegistrar.getRegistrationId(this);

		// Check if regid already present
		if (regId.equals("")) {
			// Registration is not present, register now with GCM
			GCMRegistrar.register(this, SENDER_ID);

			// Save the device's username and devicename for later access
			SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0);
			SharedPreferences.Editor editor = settings.edit();
			editor.putString("username", email);
			editor.putString("devicename", name);
			editor.commit();
		}
		else {
			// Try to register again, but not in the UI thread.
			// It's also necessary to cancel the thread onDestroy(),
			// hence the use of AsyncTask instead of a raw thread.
			final Context context = this;
			mRegisterTask = new AsyncTask<Void, Void, Void>() {

				@Override
				protected Void doInBackground(Void... params) {
					// Register device on Monitordroid server
					ServerUtilities.register(context, name, email, regId);
					return null;
				}

				@Override
				protected void onPostExecute(Void result) {
					mRegisterTask = null;
				}

			};
			mRegisterTask.execute(null, null, null);
		}

		GCMHeartbeatAlarm gcmAlarm = new GCMHeartbeatAlarm();
		gcmAlarm.setAlarm(this);
	}

	/**
	 * Broadcast receiver for receiving GCM messages
	 * */
	private final BroadcastReceiver mHandleMessageReceiver = new BroadcastReceiver() {
		@Override
		public void onReceive(Context context, Intent intent) {
			String newMessage = intent.getExtras().getString(EXTRA_MESSAGE);
			lblMessage.append(newMessage + "\n");
		}
	};

	@Override
	protected void onDestroy() {
		super.onStop();
		if (mRegisterTask != null) {
			mRegisterTask.cancel(true);
		}
		try {
			unregisterReceiver(mHandleMessageReceiver);
			GCMRegistrar.onDestroy(this);
		}
		catch (Exception e) {
		}
		super.onDestroy();
	}

}