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Flutter E/EventChannel : Failed to open event stream System services not available to Activities before onCreate()

I can't solve this problem. I want to write a flutter plugin for connecting to scales via bluetooth, but the scales sdk It's being used through the activity page, so I tried to find information about the activity usage in the flutter plugin, so I tried to run it. ActivityAware But I can't run the SDK and I can't pass values from extend class of sdk into EventChanel and can't send back to stream flutter.
this Logcat Error
2022-09-03 01:35:18.966 7973-7973/com.example.releep_scale_connect_example E/EventChannel#scan_releep_scale: Failed to open event stream
java.lang.IllegalStateException: System services not available to Activities before onCreate()
at android.app.Activity.getSystemService(Activity.java:6916)
at aicare.net.cn.iweightlibrary.bleprofile.BleProfileServiceReadyActivity.isBLEEnabled(BleProfileServiceReadyActivity.java:299)
at aicare.net.cn.iweightlibrary.bleprofile.BleProfileServiceReadyActivity.startScan(BleProfileServiceReadyActivity.java:329)
at com.example.releep_scale_connect.ReleepScaleConnectPlugin.onListen(ReleepScaleConnectPlugin.java:156)
at io.flutter.plugin.common.EventChannel$IncomingStreamRequestHandler.onListen(EventChannel.java:218)
at io.flutter.plugin.common.EventChannel$IncomingStreamRequestHandler.onMessage(EventChannel.java:197)
at io.flutter.embedding.engine.dart.DartMessenger.invokeHandler(DartMessenger.java:178)
at io.flutter.embedding.engine.dart.DartMessenger.lambda$handleMessageFromDart$0$DartMessenger(DartMessenger.java:206)
at io.flutter.embedding.engine.dart.-$$Lambda$DartMessenger$6ZD1MYkhaLxyPjtoFDxe45u43DI.run(Unknown Source:12)
at android.os.Handler.handleCallback(Handler.java:938)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:236)
at android.app.ActivityThread.main(ActivityThread.java:8051)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:620)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1011)
2022-09-03 01:35:18.978 7973-7973/com.example.releep_scale_connect_example W/Looper: PerfMonitor longMsg : seq=135 plan=01:35:17.167 late=0ms wall=1800ms running=24ms runnable=1ms h=android.os.Handler c=io.flutter.embedding.engine.dart.-$$Lambda$DartMessenger$6ZD1MYkhaLxyPjtoFDxe45u43DI procState=2
this my plugin (ReleepScaleConnectPlugin.java)
I want this SDK to be in flutter plugin format.
this github SDK : https://github.com/evanwork1234/AiFitSDK
public class ReleepScaleConnectPlugin extends BleProfileServiceReadyActivity implements FlutterPlugin, EventChannel.StreamHandler, MethodCallHandler, ActivityAware {
private FlutterActivity activity;
private MethodChannel channel;
private EventChannel stream_chanel;
private DeviceDialog devicesDialog;
private BinaryMessenger binaryMessenger;
private String[] permissionArray = new String[] {
Manifest.permission.BLUETOOTH,
Manifest.permission.BLUETOOTH_ADMIN,
Manifest.permission.ACCESS_COARSE_LOCATION,
Manifest.permission.ACCESS_FINE_LOCATION,
Manifest.permission.INTERNET,
Manifest.permission.ACCESS_NETWORK_STATE
};
#Override
public void onAttachedToEngine(#NonNull FlutterPluginBinding flutterPluginBinding) {
binaryMessenger = flutterPluginBinding.getBinaryMessenger();
}
#Override
public void onMethodCall(#NonNull MethodCall call, #NonNull Result result) {
if (call.method.equals("getPlatformVersion")) {
result.success("Android " + android.os.Build.VERSION.RELEASE);
} else {
result.notImplemented();
}
}
#Override
public void onDetachedFromEngine(#NonNull FlutterPluginBinding binding) {
channel.setMethodCallHandler(null);
}
ArrayList listVal = new ArrayList();
private Gson gson = new Gson();
#Override
public void onListen(Object arguments, EventChannel.EventSink events) {
if (arguments.equals("scan")) {
// devicesDialog.startScan();
startScan();
String json = gson.toJson(listVal);
events.success(json);
}
}
#Override
public void onCancel(Object arguments) {
}
#Override
protected void onError(String s, int i) {
L.e("TAG", "Message = " + s + " errCode = " + i);
// showInfo(getString(R.string.state_error, errMsg, errCode), true);
}
#Override
protected void onGetWeightData(WeightData weightData) {
}
#Override
protected void onGetResult(int i, String s) {
}
#Override
protected void onServiceBinded(WBYService.WBYBinder wbyBinder) {
}
#Override
protected void onServiceUnbinded() {
}
#Override
protected void getAicareDevice(BroadData broadData) {
if (broadData != null) {
L.e("TAG", broadData.toString());
listVal.add(broadData.toString());
}
}
private void startLeScan() {
startScan();
}
private void stopLeScan() {
stopScan();
}
#Override
public void onAttachedToActivity(#NonNull #NotNull ActivityPluginBinding binding) {
L.e("TAG", "onAttachedToActivity");
activity = (FlutterActivity) binding.getActivity();
AiFitSDK.getInstance().init (activity);
channel = new MethodChannel(binaryMessenger, "releep_scale_connect");
channel.setMethodCallHandler(this);
stream_chanel = new EventChannel(binaryMessenger, "scan_releep_scale");
stream_chanel.setStreamHandler(this);
boolean backBoolean = PermissionUtils.checkPermissionArray(activity.getContext(), permissionArray, 3);
// initPermissions();
// Judge whether Bluetooth is on, if you need to change the style, you can do it yourself
if (!isBLEEnabled()) {
showBLEDialog();
}
//startScan();
// devicesDialog = new DeviceDialog(activity.getContext(), this);
}
#Override
public void onDetachedFromActivityForConfigChanges() {
L.e("TAG", "onDetachedFromActivityForConfigChanges");
}
#Override
public void onReattachedToActivityForConfigChanges(#NonNull #NotNull ActivityPluginBinding binding) {
L.e("TAG", "onReattachedToActivityForConfigChanges");
}
#Override
public void onDetachedFromActivity() {
L.e("TAG", "onDetachedFromActivity");
}
}
I want these override methods to be able to pass values back to flutter.
#Override
protected void onGetWeightData(WeightData weightData) {
}
#Override
protected void onGetResult(int i, String s) {
}
#Override
protected void onGetFatData(boolean b, BodyFatData bodyFatData) {
}

If I get a row from Database with Room and LiveData, how can I "synchronize" it with a variable in the UI thread?

The example:
selectedCode.something() gives error, because selectedCode is null, it has not initialized in the other thread, but I don't want the whole section to write in the changed method of Observable.
Maybe there is an other way to do this?
public class CodeDetailsActivity extends AppCompatActivity {
private Code selectedCode;
private CodeRepository mCodeRepository;
private void retrieve(final int id){
mCodeRepository.retrieveCode(id).observe(this, new Observer<Code>() {
#Override
public void onChanged(Code code) {
if (code != null){
selectedCode = code;
}
}
});
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_code_details);
retrieveCode(1);
selectedCode.something();

Android System.Err for setVisibility(View.GONE)?

I've noticed a bug in a basic survey app I'm making to better learn android.
Occasionally I get a W/System.err﹕ at MainActivity.surveyAvailable(MainActivity.java:40) that points to this line of code:
button.setVisibility(View.GONE);
I've used setVisibility many times before and never had any issues.
Here's the function, this gets called when the user first enters the app, and after they finish taking a survey to check the server and see if there is another survey available for the user:
public void surveyAvailable(boolean surveyIsAvailable) {
Log.d("MainActivity", "App survey is available? " + surveyIsAvailable );
Button button = (Button)findViewById(R.id.takeSurveyButton);
if (surveyIsAvailable) {
button.setVisibility(View.VISIBLE);
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
App.getInstance().showSurvey();
}
});
} else {
Log.d("MainActivity", "We hit here");
button.setVisibility(View.GONE);
}
}
When a survey isn't available, the appropriate lines are logged - App survey is available? false and 'We hit here'. But then the button sometimes doesn't get set to View.GONE and I see the System.Err line. But sometimes it works fine and the button's visibility does change. Any idea how to fix that? Or how to get more information on what the System.Err actually means?
EDIT:
I found that by setting Button surveyButton; in my activity and then referencing the button as this.surveyButton seems to get the functionality to work more along the lines of what we'd expect (e.g. when we call button.setVisibility(View.GONE) the view is actually consistently GONE). But it still throws the System.Err line which has me hesitant that things are working correctly.
Edited Activity:
public class MainActivity extends ActionBarActivity implements SurveyListener {
Button surveyButton;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
this.surveyButton = (Button)findViewById(R.id.takeSurveyButton);
}
public void surveyAvailable(boolean surveyIsAvailable) {
Log.d("MainActivity", "App survey is available? " + surveyIsAvailable );
if (surveyIsAvailable) {
this.surveyButton.setVisibility(View.VISIBLE);
this.surveyButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
App.getInstance().showSurvey();
}
});
} else {
Log.d("MainActivity", "We hit here");
this.surveyButton.setVisibility(View.GONE);
}
}
}
The activity implements this class:
public abstract interface SurveyListener
{
public abstract void surveyAvailable(boolean surveyAvailable);
}
Main App class that checks for surveys and calls 'surveyAvailable()`:
public class App
{
private static App _instance;
private SurveyListener _eventsHandler;
private String _apiKey = "";
private String _appuserId = "";
private String _surveyUrl = "";
private Activity _parentContext;
private Boolean _surveyAvailable;
public static App initWithApiKeyAndListener(String apiKey, SurveyListener surveyEventsHandler) {
if (_instance == null)
{
_instance = new App();
_instance._parentContext = (Activity) surveyEventsHandler;
_instance.setSurveyListener(surveyEventsHandler);
_instance.setApiKey(apiKey);
String appuserId = PreferenceManager.getDefaultSharedPreferences((Activity) _instance._eventsHandler).getString(tag, "no_appuser");
if (appuserId == "no_appuser") {
_instance._surveyAvailable = true;
_instance.alertAvailability(true);
} else {
_instance.checkForCampaigns();
}
}
return _instance;
}
private void alertAvailability(boolean surveyAvailable) {
App.getInstance()._eventsHandler.surveyAvailable(surveyAvailable);
}
private void checkForCampaigns() {
new CampaignCheck().execute();
}
public static App getInstance()
{
if (_instance == null)
{
_instance = new App();
}
return _instance;
}
public void donePushed()
{
App.getInstance().checkForCampaigns();
}
private class CampaignCheck extends AsyncTask<Void, Void, Void> {
protected Void doInBackground(Void... params) {
Boolean surveysAvailable = false;
try {
surveysAvailable = new AppuserConnection().checkCampaigns();
App.getInstance()._surveyAvailable = surveysAvailable;
App.getInstance().alertAvailability(_surveyAvailable);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(Void result) {
}
}
}

You shouldn't modify the UI elements from a different thread. You are doing this by calling App.getInstance().alertAvailability(_surveyAvailable); on a background thread. Move this to the AsyncTask's onPostExecute.

Passing data to a handler, from another class

I have a Handler that is in my MainActivity. This Handler has to update the UI of one of my Fragments inside of the MainActivity's layout.
I then have a separate class that has a loop; when I create this class, let's called it myLooper it does some sort of calculation then send the information inside of the loop to the Handler in my MainActivity. Which in turn will then update that data onto a GraphView that I have implemented within my MainActivity's Fragment.
FLOW:
Step 1: Calculate data on MyLooper.
Step 2: Send data to MainActivity via my Handler.
Step 3: Have my Handler update MainActivity's Fragment's GraphView with the sent data.
Relevant code:
public class MainActivity extends ActionBarActivity implements
ActionBar.TabListener {
public MyLooper myDataLooper;
Fragment graphFrag = fragment_graphpage.newInstance(1);
public final Handler myHandler = new Handler() {
#Override
public void handleMessage(Message msg) {
// TODO Auto-generated method stub
((fragment_graphpage) graphFrag).updateGraphUI(msg.getData().getFloat("myvoltage"));
}
};
SectionsPagerAdapter mSectionsPagerAdapter;
globalControlInstance globalControl;
ViewPager mViewPager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
globalControl = globalControlInstance.getInstance();
myDataLooper = (IOIOBoard) getApplicationContext();
myDataLooper.create(getBaseContext(), this,_myIOIOHandler);
myDataLooper.start();
}
MyLooper class:
public class MyLooper extends Application implements IOIOLooperProvider {
globalControlInstance globalData = globalControlInstance.getInstance();
public AnalogInput AI1;
public Handler IOIOHandler;
private final IOIOAndroidApplicationHelper helper_ = new IOIOAndroidApplicationHelper(
this, this);
protected void create(Context myContext, Activity myActivity, Handler myHandler) {
IOIOHandler = myHandler;
helper_.create();
}
protected void destroy() {
helper_.destroy();
}
protected void start() {
helper_.start();
}
protected void stop() {
helper_.stop();
}
protected void restart() {
helper_.restart();
}
class Looper extends BaseIOIOLooper {
#Override
protected void setup() throws ConnectionLostException {
}
#Override
public void loop() throws ConnectionLostException, InterruptedException {
Message myVoltageMessage = new Message();
Bundle myVoltageBundle = new Bundle();
myVoltageBundle.putFloat("myvoltage", AI1.getVoltage());
myVoltageMessage.setData(myVoltageBundle);
IOIOHandler.sendMessage(myVoltageMessage);
}
}
#Override
public IOIOLooper createIOIOLooper(String connectionType, Object extra) {
return new Looper();
}
}
Finally the Fragment that contains my GraphView's updateGraphUI method.:
public void updateGraphUI(float newReading) {
final double newReadingDouble = newReading;
mTimer2 = new Runnable() {
#Override
public void run() {
graphLoopCounter++;
if (globalData.isLiveUpdatingEnabled()) {
alarmCheck(newReadingDouble);
globalData.setGraph2LastXValue(globalData
.getGraph2LastXValue() + 1d);
globalData.getGraphViewSeries().appendData(
new GraphViewData(globalData.getGraph2LastXValue(),
newValue), true, 1000);
if (globalData.getGraphPeak() < newReadingDouble) {
globalData.setGraphPeak(newReadingDouble);
graphPeak.setText("Graph Peak: "
+ Double.toString(newReadingDouble));
}
avgSum += globalData.getLatestGraphData();
graphAvg.setText("Graph Avg: " + Double.toString(avgSum/graphLoopCounter));
mHandler.postDelayed(this, 100);
}
}
};
mHandler.postDelayed(mTimer2, 100);
}
where mHandler is a handler in my Fragment's implementation. and both mTimer1 and mTimer2 are Runnables.
my problem is; no matter what I try to do data is not sent to my GraphView and it never updates...

In MainActivity you name your Handler instance "myHandler" but then you pass your MyLooper class "_myIOIOHandler".

Get array from BackgroundTask method to another Activity

I'm newbie in Java/ADT and I'm trying to get an array from "Activity A" to "Activity B". The app takes information from a webpage, and then saves it in a pair of arrays and show the information. I want to click a "go to graph" button (calls to viewallday()) to redirect to Activity B who will show a graphic with all this information.
The problem is that they're a self refresh array (1sec refresh) and don't want to loose this feature when the app It's on graphic mode (Activity B). Any ideas about how to do that?
Thank all of you in advance, I'm learning a lot from this site.
UPDATE: I'm trying to do this with a Singleton pattern. But LogCat says:
02-26 22:21:59.300: E/AndroidRuntime(2677): FATAL EXCEPTION: main
02-26 22:21:59.300: E/AndroidRuntime(2677): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.Chispa/com.example.Chispa.Activity_allday}: android.os.NetworkOnMainThreadException
02-26 22:21:59.300: E/AndroidRuntime(2677): Caused by: android.os.NetworkOnMainThreadException
UPDATE 2: Finally got it!! Here's the code I used:
Here's the code for Activity A:
public class MainActivity extends Activity {
private TextView tvmax, tvmid, tvmin, tvactualval,tvvaloractual,tvdate;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tvdate=(TextView)findViewById(R.id.tvdate);
tvvaloractual=(TextView)findViewById(R.id.tvvaloractual);
tvmax=(TextView)findViewById(R.id.tvmaximo);
tvmid=(TextView)findViewById(R.id.tvmedio);
tvmin=(TextView)findViewById(R.id.tvminimo);
new BackGroundTask().execute();
callAsynchronousTask();
}
public void callAsynchronousTask() {
final Handler handler = new Handler();
Timer timer = new Timer();
TimerTask doAsynchronousTask = new TimerTask() {
#Override
public void run() {
handler.post(new Runnable() {
public void run() {
try {
BackGroundTask performBackgroundTask = new BackGroundTask();
// PerformBackgroundTask this class is the class that extends AsynchTask
performBackgroundTask.execute();
} catch (Exception e) {
// TODO Auto-generated catch block
}
}
});
}
};
timer.schedule(doAsynchronousTask, 0, 1000); //execute in every 1000 ms
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
public class Pair
{
public String[] bar;
public String[] values;
}
public void viewallday(View view) {
Intent intent = new Intent(MainActivity.this, Activity_allday.class);
startActivity(intent);
}
class BackGroundTask extends AsyncTask<Void, Void, Pair> {
#Override
protected void onPreExecute() {
super.onPreExecute();
}
public String[] getValuesGraph(Document doc) {
int cont=24,var=7;
String bar[] = new String[cont];
/*
* Getting elements from the graphic in an array from 0-23. 0 it's 1:00am, 23 it's 00:00am
*/
for (cont=0; cont < 24; cont++){
String onMouseOver = doc.select("a").get(var+cont).attr("onMouseOver");
bar[cont] = onMouseOver.split("'")[9];
}
return bar;
}
public String[] getValuesFooter(Document doc) {
String values[] = new String[7];
/*
* Getting elements from the graphic footer
*/
String delimiters= "[ /]+";
Elements elements = doc.select("td.cabeceraRutaTexto");
elements.size(); // 6
/* Getting text from table */
values[0] = elements.get(0).text(); // TITLE
values[1] = elements.get(1).text(); // TEXT MAX VALUE
values[2] = elements.get(2).text(); // TEXT MIDDLE VALUE
values[3] = elements.get(3).text(); // TEXTO MIN VALUE
/* Getting numbers from table */
values[4] = elements.get(4).text().split(delimiters)[0]; // NUMBER MAX VALUE
values[5] = elements.get(5).text().split(delimiters)[0]; // NUMBER MIDDLE VALUE
values[6] = elements.get(6).text().split(delimiters)[0]; // NUMBER MIN VALUE
return values;
}
public Document getUrl(){
try {
URL url= new URL("http://www.endesaonline.com/canal/precios/Canal_Preciosdelpool.asp?FECHA=20140226");
/*URL url= new URL("http://www.endesaonline.com/canal/precios/Canal_Preciosdelpool.asp?lang=es&frameId=4064&segmento=1&promocion=");*/
Document doc = Jsoup.connect(url.toString()).get();
return doc;
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
#Override
public Pair doInBackground(Void... params) {
Pair p = new Pair();
GlobalVariables gs = (GlobalVariables) getApplication();
gs.setBar(getValuesGraph(getUrl()));
p.bar = getValuesGraph(getUrl());
p.values = getValuesFooter(getUrl());
return p;
}
public String ActualHourValue() {
Format formatter = new SimpleDateFormat("H");
String onlyhour = formatter.format(new Date());
return onlyhour;
}
public void ShowDateHour(){
Calendar c = Calendar.getInstance();
SimpleDateFormat df3 = new SimpleDateFormat("dd-MM-yyyy HH:mm:ss a");
String formattedDate3 = df3.format(c.getTime());
tvdate.setText("Fecha y hora actuales : "+formattedDate3);
}
#Override
protected void onPostExecute(Pair p) {
int hour = Integer.parseInt(ActualHourValue());
tvvaloractual.setText(p.bar[hour]+" €/MWh");
tvmax.setText(p.values[4]+" €/MWh");
tvmid.setText(p.values[5]+" €/MWh");
tvmin.setText(p.values[6]+" €/MWh");
ShowDateHour();
/*super.onPostExecute(p.values);*/
}
}
}
And here's the code for Activity B:
public class Activity_allday extends MainActivity {
private TextView tvall;
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.all_day_price);
TextView tvall=(TextView)findViewById(R.id.tvall);
GlobalVariables gs = (GlobalVariables) getApplication();
String[] s = gs.getBar();
tvall.setText(s[0]);
}
}
And here's a GlobalVariable class who captures the array I want to send to Activity B:
public class Activity_allday extends MainActivity {
private TextView tvall;
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.all_day_price);
TextView tvall=(TextView)findViewById(R.id.tvall);
GlobalVariables gs = (GlobalVariables) getApplication();
String[] s = gs.getBar();
tvall.setText(s[0]);
}
}
That's all! hope It'll help to future users.
Thanks all for your help.

Here is something you could try:
Inside your AsyncTask, define an interface and a method inside it that will pass back the data to the calling activity and inside that method, call the next activity and set the data as an extra.
This is the simplest way.
In your AsyncTask, inside onPostExecute(result), use a try block to call the method which belongs to the above mentioned interface which must be implemented by the calling activity.
HomeActivity.java
/public class SampleActivity extends Activity implements SampleAsyncTask.OnUpdateListener{
#Override
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
executeAsync();
}
public void executeAsync(){
new SampleAsyncTask(this).execute("someFlagToCheck");
}
#Override
public void onDataProcessed(String result){
Intent intent = new Intent(this, SecondActivity.class);
intent.putExtra("data", result);
startActivity(intent);
}
}
SampleAsyncTask.java
public class SampleAsyncTask extends AsyncTask<Void, Void, String>{
Context context;
//constructor
SampleAsyncTask(Context context){
this.context = context;
}
#Override
public void doInBackground(String... params){
//do something depending on the arguments in params
return "data";
}
#Override
public void onPostExecute(String result){
try{
((OnUpdateListener) context).onDataProcessed(result);
}catch(Exception e){
e.printStackTrace();
}
}
public interface OnUpdateListener{
public void onDataProcessed(String data);
}
}
Follow this example. The calling activity implements the AsyncTask's interface and overrides its method which will be called when the async task is done with the result.
I hope this helped.

SOLUTION:
Here's the code for Activity A:
public class MainActivity extends Activity {
private TextView tvmax, tvmid, tvmin, tvactualval,tvvaloractual,tvdate;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tvdate=(TextView)findViewById(R.id.tvdate);
tvvaloractual=(TextView)findViewById(R.id.tvvaloractual);
tvmax=(TextView)findViewById(R.id.tvmaximo);
tvmid=(TextView)findViewById(R.id.tvmedio);
tvmin=(TextView)findViewById(R.id.tvminimo);
new BackGroundTask().execute();
callAsynchronousTask();
}
public void callAsynchronousTask() {
final Handler handler = new Handler();
Timer timer = new Timer();
TimerTask doAsynchronousTask = new TimerTask() {
#Override
public void run() {
handler.post(new Runnable() {
public void run() {
try {
BackGroundTask performBackgroundTask = new BackGroundTask();
// PerformBackgroundTask this class is the class that extends AsynchTask
performBackgroundTask.execute();
} catch (Exception e) {
// TODO Auto-generated catch block
}
}
});
}
};
timer.schedule(doAsynchronousTask, 0, 1000); //execute in every 1000 ms
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
public class Pair
{
public String[] bar;
public String[] values;
}
public void viewallday(View view) {
Intent intent = new Intent(MainActivity.this, Activity_allday.class);
startActivity(intent);
}
class BackGroundTask extends AsyncTask<Void, Void, Pair> {
#Override
protected void onPreExecute() {
super.onPreExecute();
}
public String[] getValuesGraph(Document doc) {
int cont=24,var=7;
String bar[] = new String[cont];
/*
* Getting elements from the graphic in an array from 0-23. 0 it's 1:00am, 23 it's 00:00am
*/
for (cont=0; cont < 24; cont++){
String onMouseOver = doc.select("a").get(var+cont).attr("onMouseOver");
bar[cont] = onMouseOver.split("'")[9];
}
return bar;
}
public String[] getValuesFooter(Document doc) {
String values[] = new String[7];
/*
* Getting elements from the graphic footer
*/
String delimiters= "[ /]+";
Elements elements = doc.select("td.cabeceraRutaTexto");
elements.size(); // 6
/* Getting text from table */
values[0] = elements.get(0).text(); // TITLE
values[1] = elements.get(1).text(); // TEXT MAX VALUE
values[2] = elements.get(2).text(); // TEXT MIDDLE VALUE
values[3] = elements.get(3).text(); // TEXTO MIN VALUE
/* Getting numbers from table */
values[4] = elements.get(4).text().split(delimiters)[0]; // NUMBER MAX VALUE
values[5] = elements.get(5).text().split(delimiters)[0]; // NUMBER MIDDLE VALUE
values[6] = elements.get(6).text().split(delimiters)[0]; // NUMBER MIN VALUE
return values;
}
public Document getUrl(){
try {
URL url= new URL("http://www.endesaonline.com/canal/precios/Canal_Preciosdelpool.asp?FECHA=20140226");
/*URL url= new URL("http://www.endesaonline.com/canal/precios/Canal_Preciosdelpool.asp?lang=es&frameId=4064&segmento=1&promocion=");*/
Document doc = Jsoup.connect(url.toString()).get();
return doc;
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
#Override
public Pair doInBackground(Void... params) {
Pair p = new Pair();
GlobalVariables gs = (GlobalVariables) getApplication();
gs.setBar(getValuesGraph(getUrl()));
p.bar = getValuesGraph(getUrl());
p.values = getValuesFooter(getUrl());
return p;
}
public String ActualHourValue() {
Format formatter = new SimpleDateFormat("H");
String onlyhour = formatter.format(new Date());
return onlyhour;
}
public void ShowDateHour(){
Calendar c = Calendar.getInstance();
SimpleDateFormat df3 = new SimpleDateFormat("dd-MM-yyyy HH:mm:ss a");
String formattedDate3 = df3.format(c.getTime());
tvdate.setText("Fecha y hora actuales : "+formattedDate3);
}
#Override
protected void onPostExecute(Pair p) {
int hour = Integer.parseInt(ActualHourValue());
tvvaloractual.setText(p.bar[hour]+" €/MWh");
tvmax.setText(p.values[4]+" €/MWh");
tvmid.setText(p.values[5]+" €/MWh");
tvmin.setText(p.values[6]+" €/MWh");
ShowDateHour();
/*super.onPostExecute(p.values);*/
}
}
}
Activity B:
public class Activity_allday extends MainActivity {
private TextView tvall;
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.all_day_price);
TextView tvall=(TextView)findViewById(R.id.tvall);
GlobalVariables gs = (GlobalVariables) getApplication();
String[] s = gs.getBar();
tvall.setText(s[0]);
}
}
Global variable class who captures the array I want to send to Activity B:
public class Activity_allday extends MainActivity {
private TextView tvall;
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.all_day_price);
TextView tvall=(TextView)findViewById(R.id.tvall);
GlobalVariables gs = (GlobalVariables) getApplication();
String[] s = gs.getBar();
tvall.setText(s[0]);
}
}
Thanks all for your help!!