Java tutorial
// -*- mode: java; c-basic-offset: 2; -*- // Copyright 2009-2011 Google, All Rights reserved // Copyright 2011-2012 MIT, All rights reserved // Released under the MIT License https://raw.github.com/mit-cml/app-inventor/master/mitlicense.txt package com.google.appinventor.components.runtime; import android.os.Handler; import android.os.Message; import android.util.Log; import com.google.appinventor.components.annotations.*; import com.google.appinventor.components.common.ComponentCategory; import com.google.appinventor.components.common.PropertyTypeConstants; import com.google.appinventor.components.common.YaVersion; import com.google.gson.GsonBuilder; import com.google.gson.JsonElement; import com.google.gson.JsonObject; import edu.mit.media.funf.FunfManager; import edu.mit.media.funf.json.IJsonObject; import edu.mit.media.funf.probe.Probe.DataListener; import edu.mit.media.funf.probe.builtin.LightSensorProbe; import edu.mit.media.funf.probe.builtin.ProbeKeys; import edu.mit.media.funf.probe.builtin.RunningApplicationsProbe; @DesignerComponent(version = YaVersion.LIGHTSENSOR_COMPONENT_VERSION, description = "Return information of the current illuminances (lux) by using the light sensor ", category = ComponentCategory.SENSORS, nonVisible = true, iconName = "images/lightsensorProbe.png") @SimpleObject @UsesLibraries(libraries = "funf.jar") public class LightSensor extends ProbeBase { private final String TAG = "LightSensor"; private LightSensorProbe probe; private final String LIGHTSENSOR_PROBE = "edu.mit.media.funf.probe.builtin.LightSensorProbe"; private int lux; private long timestamp; //default settings for schedule private final int SCHEDULE_INTERVAL = 1800; //read illuminances every 1800 seconds (30 minutes) private final int SCHEDULE_DURATION = 15; //scan for 15 seconds everytime public LightSensor(ComponentContainer container) { super(container); // TODO Auto-generated constructor stub form.registerForOnDestroy(this); mainUIThreadActivity = container.$context(); Log.i(TAG, "Before create probe"); gson = new GsonBuilder().registerTypeAdapterFactory(FunfManager.getProbeFactory(mainUIThreadActivity)) .create(); JsonObject config = new JsonObject(); probe = gson.fromJson(config, LightSensorProbe.class); interval = SCHEDULE_INTERVAL; duration = SCHEDULE_DURATION; } private DataListener listener = new DataListener() { @Override public void onDataCompleted(IJsonObject completeProbeUri, JsonElement arg1) { //do nothing. LightSensorProbe does not have onDataComplete event } @Override public void onDataReceived(IJsonObject completeProbeUri, IJsonObject data) { Log.i(TAG, "receive data of illuminances"); /* returned json format {"accuracy":0,"lux":100.0,"timestamp":946695643.291918} */ //debug Log.i(TAG, "DATA: " + data.toString()); //debug //save data to DB is enabledSaveToDB is true if (enabledSaveToDB) { saveToDB(completeProbeUri, data); } Message msg = myHandler.obtainMessage(); msg.obj = data; myHandler.sendMessage(msg); } }; final Handler myHandler = new Handler() { @Override public void handleMessage(Message msg) { IJsonObject data = (IJsonObject) msg.obj; Log.i(TAG, "Update component's varibles....."); lux = data.get(ProbeKeys.LightSensorKeys.LUX).getAsInt(); timestamp = data.get(ProbeKeys.LightSensorKeys.TIMESTAMP).getAsLong(); Log.i(TAG, " before call LightInfoReceived()"); LightInfoReceived(); Log.i(TAG, " after call LightInfoReceived()"); } }; /** * Indicates whether the sensor should "run once" to read the current illuminance */ @SimpleFunction(description = "Enable light sensor probe to run once") @Override public void Enabled(boolean enabled) { // TODO Auto-generated method stub if (this.enabled != enabled) this.enabled = enabled; if (enabled) { probe.registerListener(listener); Log.i(TAG, "register listener for run-once"); } else { probe.unregisterListener(listener); Log.i(TAG, "unregister run-once listener"); } } @Override public void unregisterDataRequest() { // TODO Auto-generated method stub Log.i(TAG, "Unregistering data requests."); mBoundFunfManager.unrequestAllData2(listener); Log.i(TAG, "After Unregistering data requests."); } @Override public void registerDataRequest(int interval, int duration) { // TODO Auto-generated method stub Log.i(TAG, "Registering data requests."); JsonElement dataRequest = null; dataRequest = getDataRequest(interval, duration, LIGHTSENSOR_PROBE); Log.i(TAG, "Data request: " + dataRequest.toString()); mBoundFunfManager.requestData(listener, dataRequest); } /** * Indicates that the illuminance(light) info has been received. */ @SimpleEvent public void LightInfoReceived() { if (enabled || enabledSchedule) { mainUIThreadActivity.runOnUiThread(new Runnable() { public void run() { Log.i(TAG, "LightInfoReceived() is called"); EventDispatcher.dispatchEvent(LightSensor.this, "LightInfoReceived"); } }); } } /** * Returns whether the screen is currently on */ @SimpleProperty(description = "The illuminance(lux) of light in the current environment.") public int Lux() { Log.i(TAG, "returning lux: " + lux); return lux; } /** * Returns the timestamp of latest reading */ @SimpleProperty(description = "The timestamp of this sensor event.") public float Timestamp() { Log.i(TAG, "returning timestamp: " + timestamp); return timestamp; } /* * Returns the default interval between each scan for this probe */ @SimpleProperty(description = "The default interval (in seconds) between each scan for this probe") public float DefaultInterval() { return SCHEDULE_INTERVAL; } /* * Returns the default duration of each scan for this probe */ @SimpleProperty(description = "The default duration (in seconds) of each scan for this probe") public float DefaultDuration() { return SCHEDULE_DURATION; } }