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 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.ProbeKeys; import edu.mit.media.funf.probe.builtin.RunningApplicationsProbe; import edu.mit.media.funf.probe.builtin.ScreenProbe; import android.os.Handler; import android.os.Message; import android.util.Log; @DesignerComponent(version = YaVersion.SCREENSTATUS_COMPONENT_VERSION, description = "Return information about the ", category = ComponentCategory.SENSORS, nonVisible = true, iconName = "images/screenProbe.png") @SimpleObject @UsesLibraries(libraries = "funf.jar") public class ScreenStatus extends ProbeBase { private final String TAG = "ScreenStatus"; private ScreenProbe probe; private final String SCREENSTATUS_PROBE = "edu.mit.media.funf.probe.builtin.ScreenProbe"; private boolean screen_on; private long timestamp; //default settings for schedule private final int SCHEDULE_INTERVAL = 900; //scan for screen status every 900 seconds (15 minutes) private final int SCHEDULE_DURATION = 15; //scan for 15 seconds everytime public ScreenStatus(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, ScreenProbe.class); interval = SCHEDULE_INTERVAL; duration = SCHEDULE_DURATION; } private DataListener listener = new DataListener() { @Override public void onDataCompleted(IJsonObject completeProbeUri, JsonElement arg1) { //do nothing. ScreenStatus does not have onDataComplete event } @Override public void onDataReceived(IJsonObject completeProbeUri, IJsonObject data) { Log.i(TAG, "receive data of running applications"); /* returned json format {"screenOn":true,"timestamp":946695532.248} */ //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....."); screen_on = data.get(ProbeKeys.ScreenKeys.SCREEN_ON).getAsBoolean(); timestamp = data.get(ProbeKeys.ScreenKeys.TIMESTAMP).getAsLong(); Log.i(TAG, " before call ApplicationsInfoReceived()"); ScreenInfoReceived(timestamp, screen_on); Log.i(TAG, " after call ApplicationsInfoReceived()"); } }; /** * Indicates whether the sensor should "run once" to listen for current screenStatus */ @SimpleFunction(description = "Enable screen status sensor 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) { Log.i(TAG, "Registering data requests."); JsonElement dataRequest = null; dataRequest = getDataRequest(interval, duration, SCREENSTATUS_PROBE); Log.i(TAG, "Data request: " + dataRequest.toString()); mBoundFunfManager.requestData(listener, dataRequest); } /** * Indicates that the running applications info has been received. */ @SimpleEvent public void ScreenInfoReceived(final long timestamp, final boolean screenOn) { if (enabled || enabledSchedule) { mainUIThreadActivity.runOnUiThread(new Runnable() { public void run() { Log.i(TAG, "ScreenInfoReceived() is called"); EventDispatcher.dispatchEvent(ScreenStatus.this, "ScreenInfoReceived", timestamp, screenOn); } }); } } // /** // * Returns whether the screen is currently on // */ // @SimpleProperty(description = "The status of whether the screen on or not.") // public boolean ScreenOn() { // Log.i(TAG, "returning screen_on: " + screen_on); // return screen_on; // } // // /** // * 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; } }