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.ActivityProbe; import edu.mit.media.funf.probe.builtin.CellTowerProbe; import edu.mit.media.funf.probe.builtin.ProbeKeys.ActivityKeys; import edu.mit.media.funf.probe.builtin.ProbeKeys.CellKeys; @DesignerComponent(version = YaVersion.ACTIVITYPROBESENSOR_COMPONENT_VERSION, description = "Records how active the person is. Uses the AccelerometerProbe data to calculate" + "each interval the variance of a device's acceleration and assign labels (high/medium/low) based on " + "whether the variance is above a certain threshold. " + "Intervals are 1 seconds long.", category = ComponentCategory.SENSORS, nonVisible = true, iconName = "images/activityProbe.png") @SimpleObject @UsesLibraries(libraries = "funf.jar") public class ActivityProbeSensor extends ProbeBase { private final String TAG = "ActivityProbe"; private final String ACTIVITY_PROBE = "edu.mit.media.funf.probe.builtin.ActivityProbe"; private ActivityProbe probe; private String activityLevel; private long timestamp; //default settings for schedule private final int SCHEDULE_INTERVAL = 120; //scan for activity level every 120 seconds private final int SCHEDULE_DURATION = 15; //scan for 15 seconds everytime private DataListener listener = new DataListener() { @Override public void onDataCompleted(IJsonObject completeProbeUri, JsonElement arg1) { ActivityScanComplete(); } @Override public void onDataReceived(IJsonObject completeProbeUri, IJsonObject data) { Log.i(TAG, "receive activitytower data"); /* returned json format * {"activityLevel":"none","timestamp":1345090214.061} * {"activityLevel":"low","timestamp":1345090214.061} * {"activityLevel":"high","timestamp":1345090214.061 * */ Log.i(TAG, "activity_level:" + data.get(ActivityKeys.ACTIVITY_LEVEL).getAsString()); Log.i(TAG, "timestamp:" + data.get(CellKeys.TIMESTAMP).getAsLong()); //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....."); activityLevel = data.get(ActivityKeys.ACTIVITY_LEVEL).getAsString(); timestamp = data.get(CellKeys.TIMESTAMP).getAsLong(); Log.i(TAG, " before call ActivityInfoReceived()"); ActivityInfoReceived(timestamp, activityLevel); Log.i(TAG, " after call ActivityInfoReceived()"); } }; public ActivityProbeSensor(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, ActivityProbe.class); interval = SCHEDULE_INTERVAL; duration = SCHEDULE_DURATION; } /** * Indicates whether the sensor should "run once" to listen for activity level information */ @SimpleFunction(description = "Enable activity probe 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) { // TODO Auto-generated method stub Log.i(TAG, "Registering data requests."); JsonElement dataRequest = null; dataRequest = getDataRequest(interval, duration, ACTIVITY_PROBE); Log.i(TAG, "Data request: " + dataRequest.toString()); mBoundFunfManager.requestData(listener, dataRequest); } /** * Indicates that the activity info has been received. */ @SimpleEvent public void ActivityInfoReceived(final long timestamp, final String activityLevel) { if (enabled || enabledSchedule) { mainUIThreadActivity.runOnUiThread(new Runnable() { public void run() { Log.i(TAG, "ActivityInfoReceived() is called"); EventDispatcher.dispatchEvent(ActivityProbeSensor.this, "ActivityInfoReceived", timestamp, activityLevel); } }); } } /** * Indicates that one round of scan has finish */ @SimpleEvent public void ActivityScanComplete() { if (enabled || enabledSchedule) { mainUIThreadActivity.runOnUiThread(new Runnable() { public void run() { Log.i(TAG, "ActivityScanComplete() is called"); EventDispatcher.dispatchEvent(ActivityProbeSensor.this, "ActivityScanComplete"); } }); } } /** * Returns the latest reading of the activity level of one interval */ // @SimpleProperty(description = "The activity level of the interval.") // public String ActivityLevel() { // Log.i(TAG, "returning activityLevel: " + activityLevel); // return activityLevel; // } /** * 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; } }