I have this code, I have 2 AsyncTask I called that by button, and I have one more I want to ask is there any way to call the Asynctask automatic when is open the activity?
I tried to but it with onCreate but it is error
public class SingleCompleteOrder extends ActionBarActivity {
private static final String comp_id = "complete_id";
private static final String comp_table = "complete_table";
private static final String comp_items = "complete_items";
private static final String comp_date = "complete_date";
private TextView oid;
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// TODO Auto-generated method stub
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// TODO Auto-generated method stub
switch (item.getItemId()) {
case android.R.id.home:
onBackPressed();
break;
default:
break;
}
return super.onOptionsItemSelected(item);
}
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_single_contact);
...
...
...
...
...
}
public void huss() {
Updatsituation task = new Updatsituation ();
task.execute();
}
private class Updatsituation extends AsyncTask<Void,Void,Boolean> {
private ProgressDialog pd;
private Boolean result = false;
#Override
protected void onPreExecute() {
// TODO Auto-generated method stub
super.onPreExecute();
pd = new ProgressDialog(SingleCompleteOrder.this);
pd.setMessage("Processing commend,Please wait");
pd.setProgressStyle(ProgressDialog.STYLE_SPINNER);
pd.setCancelable(false);
pd.show();
}
#Override
protected Boolean doInBackground(Void... params) {
// TODO Auto-generated method stub
HttpClient client = new DefaultHttpClient();
HttpPost post = new HttpPost(Utils.WS_UPDATE_SITUAT);
List<NameValuePair> mParams = new ArrayList<NameValuePair>();
mParams.add(new BasicNameValuePair("complete_id", oid.getText().toString()));
mParams.add(new BasicNameValuePair("order_situation","showed"));
try {
post.setEntity(new UrlEncodedFormEntity(mParams));
HttpResponse response = client.execute(post);
String res = EntityUtils.toString(response.getEntity());
Log.d("Order Preview", res);
JSONObject jsonObj = new JSONObject(res);
result = jsonObj.getBoolean("Result");
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return result;
}
#Override
protected void onPostExecute(Boolean res) {
// TODO Auto-generated method stub
super.onPostExecute(res);
if (pd != null)
pd.dismiss();
if (res) {
Toast.makeText(SingleCompleteOrder.this,
"Order Completed Successfully", Toast.LENGTH_SHORT)
.show();
finish();
Intent intent = new Intent(SingleCompleteOrder.this,
CompleteOrdertest.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
} else {
Toast.makeText(SingleCompleteOrder.this,
"Unable to process the command", Toast.LENGTH_SHORT)
.show();
}
}
}
}
If you want to run the Async task for when the Activity is created you can do this in your OnCreate method. or if you want to execute this every time the Activity come to visibility, you can run this in onResume method.
I do not see you are calling your huss() method in any of your OnCreate or OnResume methods.
EDIT: Try this:
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_single_contact);
huss();
...
...
...
...
...
}
If you want to call your AsyncTask, simply do the following within your onCreate() method of the Activity:
#Override public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// All lines of code
new Updatsituation().execute();
}
This should fire up the task without you having to click any button.
You can put it inside onResume() but then be prepared to have it start everytime your activity resumes.
If you want to call AsyncTask automatically, then you need to call it on OnCreate() method.
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
new Updatsituation().execute(); //call your async task
}
Related
In my Android apk, I am using async task method.
It was working fine from last many years but now it is creating problem.
doinbackground() and postExecute() methods are not working (they are not called)
, only preExecute() method is working.
doinbackground() and postExecute() methods are not working (they are not called)
, only preExecute() method is working.
class MyAsyncTask extends AsyncTask<Void, ConversationModel, Void> {
#Override
protected Void doInBackground(Void... params) {
// TODO Auto-generated method stub
runOnUiThread(new Runnable() {
#Override
public void run() {
// TODO Auto-generated method stub
heading.setText("myheading");
}
});
try {
Thread.sleep(2000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
for (ConversationModel model : dataList) {
if (flagStop)
break;
publishProgress(model);
long_time = Long.parseLong(model.sound_time) * 1000 + 500;
try {
Thread.sleep(long_time);
Thread.sleep(long_extraTime);
long_extraTime = 0;
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
i++;
Log.d("i", i + " -----------------");
}
return null;
}
protected void onProgressUpdate(ConversationModel... model) {
if (i % 2 == 0) {
View v = View.inflate(Conversation1.this, arrInt_resource[0], null);
v.setAnimation(null);
TextView txtV_spn = (TextView) v.findViewById(R.id.textView_spn);
TextView txtV_eng = (TextView) v.findViewById(R.id.textView_eng);
ImageView img_sound = (ImageView) v.findViewById(R.id.imgsound_conv_spn2eng);
RelativeLayout speak_layout = (RelativeLayout) v.findViewById(R.id.speaking_layout);
heading.setText(dataList.get(0).heading);
if (flag != 1) {
txtV_spn.setText(model[0].eng_txt);
txtV_eng.setText(model[0].spn_txt);
}
#Override
protected void onPostExecute(Void result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
if (i >= dataList.size()) {
Log.d("i", i + " ------------------");
makingcontinueImageView();
}
}
}
Change .execute() method of asynctask with this one
asynctask.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
i'm observing a weird scenario here. I have a background android service which is running perfectly. but when I kill the process or application from my RecentApps my Application calls the onStartCommand method again. I don't know where I went wrong. I have searched alot but didn't find any appropriate solution. Could someone please mention what I did wrong? Thanks in Advance
Activity:
public class OptionSelectionActivity extends Activity implements
OnClickListener {
Timer time;
Intent serviceIntent;
private Button btn_selectionquiz, btn_alerts, btn_history;
ConnectionManager cm;
boolean isInternetPresent = false;
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
Log.e("onCreate", "im Running");
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_option_selection);
cm = new ConnectionManager(getApplicationContext());
isInternetPresent = cm.isConnected();
serviceIntent = new Intent(getApplicationContext(),MyService.class);
// serviceIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
// isMyServiceRunning();
if(!isMyServiceRunning())
{
Toast.makeText(getBaseContext(), "There is no service running, starting service..", Toast.LENGTH_SHORT).show();
startService(serviceIntent);
}else
{
Toast.makeText(getBaseContext(), "Service is already running", Toast.LENGTH_SHORT).show();
}
XmlView();
RegisterListenerOnXml();
}
private void XmlView() {
btn_selectionquiz = (Button) findViewById(R.id.optionselection_btn_selectquiz);
btn_alerts = (Button) findViewById(R.id.optionselection_btn_alerts);
btn_history = (Button) findViewById(R.id.optionselection_btn_history);
}
private void RegisterListenerOnXml() {
btn_selectionquiz.setOnClickListener(this);
btn_alerts.setOnClickListener(this);
btn_history.setOnClickListener(this);
}
#Override
public void onClick(View v) {
Intent i;
// TODO Auto-generated method stub
isInternetPresent = cm.isConnected();
if(isInternetPresent)
{
switch (v.getId()) {
case R.id.optionselection_btn_selectquiz:
// intent calling
i = new Intent(this, TeacherSelectionActivity.class);
startActivity(i);
break;
case R.id.optionselection_btn_history:
// intent calling
i = new Intent(this, QuizHistoryActivity.class);
startActivity(i);
break;
case R.id.optionselection_btn_alerts:
// intent calling
i = new Intent(this, GettingAlerts.class);
startActivity(i);
break;
default:
break;
}
}else
{
AlertDialogManager alert = new AlertDialogManager();
alert.showAlertDialog(OptionSelectionActivity.this, "Internet Conncetion", "No internet Connection", false);
}
}
#Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
if(!isMyServiceRunning())
{
Toast.makeText(getBaseContext(), "There is no service running, starting service..", Toast.LENGTH_SHORT).show();
// startService(serviceIntent);
}else
{
Toast.makeText(getBaseContext(), "Service is already running", Toast.LENGTH_SHORT).show();
}
}
private boolean isMyServiceRunning() {
ActivityManager manager = (ActivityManager) getSystemService(ACTIVITY_SERVICE);
for (RunningServiceInfo service : manager.getRunningServices(Integer.MAX_VALUE)) {
String temp = service.service.getClassName();
if ("com.smartclasss.alerts.MyService".equals(temp)) {
return true;
}
}
return false;
}
#Override
protected void onStop() {
// TODO Auto-generated method stub
super.onStop();
Log.e("onSTOP", "im calling...!!!!");
if(!isMyServiceRunning())
{
Toast.makeText(getBaseContext(), "There is no service running, starting service..", Toast.LENGTH_SHORT).show();
// startService(serviceIntent);
}else
{
Toast.makeText(getBaseContext(), "Service is already running", Toast.LENGTH_SHORT).show();
}
}
#Override
protected void onRestart() {
// TODO Auto-generated method stub
super.onRestart();
Log.e("onRestart", "now im calling after onStop");
}
}
Service:
public class MyService extends Service{
private SharedPreferences prefs;
private String prefName = "userPrefs";
public static String GETTING_ALERTS_URL = "http://"
+ IPAddress.IP_Address.toString()
+ "//MyServices/Alerts/AlertService.svc/alert";
public static String TAG_NAME = "DoitResult";
public static String TAG_ALERT_TITLE = "alertTitle";
static String Serv_Response = "";
static String Serv_GettingQuiz_Response = "";
boolean flag = false;
boolean isServRun = true;
public Timer time;
ArrayList<Alerts> alertsList;
public static final String INTENT_NOTIFY = "com.blundell.tut.service.INTENT_NOTIFY";
// The system notification manager
private NotificationManager mNM;
#Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return null;
}
#Override
public int onStartCommand(Intent intent, int flags, int startId) {
Log.e("Attendence", "Service Created");
// TODO Auto-generated method stub
time = new Timer();
time.schedule(new TimerTask() {
#Override
public void run() {
// TODO Auto-generated method stub
DateFormat df = new SimpleDateFormat("dd-MM-yyyy");
final String currentDate = df.format(Calendar.getInstance().getTime());
// Toast.makeText(getBaseContext(), "Service Started :"+" "+currentDate, Toast.LENGTH_LONG).show();
if(flag == false)
{
try {
savingDateinPref(currentDate);
new DoInBackground().execute(currentDate);
flag = true;
isServRun = false;
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
}
String val = prefs.getString("TAG_KEY", "defValue");
if(!currentDate.equals(val))
{
flag = false;
prefs = getSharedPreferences(prefName, MODE_PRIVATE);
SharedPreferences.Editor editor = prefs.edit();
editor.remove("TAG_KEY");
//---saves the values---
editor.commit();
}
}
},0,5000);
return START_STICKY;
}
private class DoInBackground extends AsyncTask<String, Void, Void> {
String cellphoneDate = "";
ArrayList<Alerts> alertsList = new ArrayList<Alerts>();
#Override
protected Void doInBackground(String... params) {
// TODO Auto-generated method stub
cellphoneDate = params[0];
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpGet httpGet = new HttpGet(GETTING_ALERTS_URL + "/"
+ cellphoneDate);
HttpResponse httpResponse = null;
try {
httpResponse = httpClient.execute(httpGet);
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
HttpEntity httpEntity = httpResponse.getEntity();
try {
Serv_Response = EntityUtils.toString(httpEntity);
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
if (Serv_Response != null) {
////////////////////////////new code for getting list ///////////////////
JSONObject jsonObj1 = new JSONObject(Serv_Response);
JSONArray alertName = jsonObj1.getJSONArray(TAG_NAME);
for (int i = 0; i < alertName.length(); i++) {
JSONObject c = alertName.getJSONObject(i);
String alert_title = c.getString(TAG_ALERT_TITLE);
Alerts alertObject = new Alerts();
alertObject.setAlertTitle(alert_title);
alertsList.add(alertObject);
}
}
} catch (JSONException e) {
// TODO: handle exception
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(Void result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
// Toast.makeText(getBaseContext(), "From Database :" + Serv_GettingQuiz_Response, Toast.LENGTH_LONG).show();
//String array[] = new String[size];
for(int i = 0; i < alertsList.size() ; i++ )
{
showNotification(alertsList.get(i).getAlertTitle(), "TAP for More Details", i);
// savingDate(Serv_GettingQuiz_Response);
}
}
}
private void savingDateinPref(String value){
prefs = getSharedPreferences(prefName, MODE_PRIVATE);
SharedPreferences.Editor editor = prefs.edit();
//---save the values in the EditText view to preferences---
editor.putString("TAG_KEY",value);
//---saves the values---
editor.commit();
}
}
Logcat:
06-03 12:25:22.844: E/onCreate(29973): im Running
06-03 12:25:23.174: E/Attendence(29973): Service Created
06-03 12:25:30.702: E/onSTOP(29973): im calling...!!!!
06-03 12:25:32.274: E/onCreate(29973): im Running
06-03 12:25:33.655: E/onSTOP(29973): im calling...!!!!
06-03 12:25:34.366: E/onCreate(29973): im Running
06-03 12:25:35.878: E/onSTOP(29973): im calling...!!!!
06-03 12:25:36.869: E/onRestart(29973): now im calling after onStop
06-03 12:25:45.027: E/onSTOP(29973): im calling...!!!!
06-03 12:25:48.221: E/Attendence(30447): Service Created
here in the logcat the last line shows that its call the onstartcommand method again. Why is it so? Even my Activity is not running I meant to say (the service starts in oncreate method on on acticity, but here in the logcat the control goes directly to the onStartCommand when i destroy my App ).
Your service will be START_STICKY so the android framework is restarting it -> This will give you call to onStartCommand()
I changed my service to START_NOT_STICKY so the android framework will not restart my service on its own without any explicit request from out application
To make your service of START_NOT_STICKY, just return value Service.START_NOT_STICKY from onStartCommand()
This worked and solved my issue
I have an app that sends a file through a socket. While doing this I want to show the progress in a ProgressDialog. The app sends the file perfectly but I'm not able to make the dialog appear.
public class ProgressDialogActivity extends Activity {
private ProgressDialog downloadDialog = null;
private String filePath;
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
filePath = getIntent().getExtras().getString("filePath");
downloadDialog = new ProgressDialog(this);
Task myTask = new Task();
myTask.execute(0);
}
private void showMessage(final String msg) {
this.runOnUiThread(new Runnable() {
#Override
public void run() {
// TODO Auto-generated method stub
Toast.makeText(getApplicationContext(), msg, `enter code here`Toast.LENGTH_SHORT).show();
}
});
}
private class Task extends AsyncTask<Integer, Integer, Boolean> implements Observer
{
private Thread t;
#Override
protected void onPreExecute() {
// TODO Auto-generated method stub
super.onPreExecute();
downloadDialog.setTitle("SENDING");
downloadDialog.setMessage("................");
downloadDialog.setCancelable(false);
downloadDialog.setIndeterminate(false);
// downloadDialog.setMax(100);
downloadDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
downloadDialog.show();
}
#Override
protected Boolean doInBackground(Integer... params) {
SendFile send = new SendFile(filePath);
downloadDialog.setMax(0);
t = new Thread(send);
send.registerObserver(this);
// try {
// Thread.sleep(10000);
// } catch (InterruptedException e) {
// // TODO Auto-generated catch block
// e.printStackTrace();
// }
t.start();
return true;
}
#Override
protected void onProgressUpdate(Integer... values) {
// TODO Auto-generated method stub
super.onProgressUpdate(values);
int counter = values[0].intValue();
downloadDialog.setProgress(counter);
if(filePath != null)
{
downloadDialog.setMessage(filePath+"...");
}
}
#Override
public void update(Subject subject) {
// TODO Auto-generated method stub
if(subject instanceof SendFile)
{
SendFile e = (SendFile) subject;
if(e.getException() != null)
{
t.interrupt();
showMessage(e.getException());
} else
{
if(!e.isStarted())
{
initializeProgressBar(e.getNumIter());
} else
{
refreshProgressBar(e.getNumIter());
}
if(e.isSent())
{
t.interrupt();
showMessage("File sent");
}
}
}
}
public void initializeProgressBar(int max){
downloadDialog.setMax(max);
}
public void refreshProgressBar(int amount){
publishProgress(downloadDialog.getMax()-amount);
}
#Override
protected void onPostExecute(Boolean result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
if(downloadDialog != null)
{
downloadDialog.dismiss();
}
finish();
}
#Override
protected void onCancelled() {
// TODO Auto-generated method stub
super.onCancelled();
t.interrupt();
showMessage("TASK CANCELLED");
}
};
}
SendFile is the class that contains the socket to send the files.
I think the problem is due to I'm calling the thread inside the AssyncTask because when I make Thread.sleep(10000) I can see the ProgressDialog for that time, but I don't know how to fix it.
Also, when I run the debugger I can see that the variable 'counter' is incremented every time I call it, but if I add a watch with 'downloadDialog.getProgress()' the progress is always 0.
You are creating an AsyncTask, which doInBackground() method RUNS IN BACKGROUND. In there, you don't do anything, but start a new thread... Now this thread does the work, but your AsyncTask finishes, because it has nothing to do after starting the other thread... So, your ProgressDialog is shown for some milliseconds, then your AsyncTask finishes and the ProgressDialog is hidden again. But the thread that is doing the work is still running, only your AsyncTask has finished.
Solution : Either use an AsyncTask OR use a thread.
You need to call publishProgress on doinBackground()
Example:
protected String doInBackground(Void... params) {
try {
int i = 0;
Log.i("Thread","1");
Thread.sleep(1000);
publishProgress(i++);
Log.i("Thread","2");
Thread.sleep(1000);
publishProgress(i++);
Log.i("Thread","3");
Thread.sleep(1000);
Log.i("Thread","4");
Thread.sleep(1000);
Log.i("Thread","5");
} catch (InterruptedException e) {
e.printStackTrace();
}
return "done";
}
I was trying to do a service sample program and i am getting following exception
09-10 20:57:57.871: E/AndroidRuntime(280): FATAL EXCEPTION: main 09-10
20:57:57.871: E/AndroidRuntime(280): java.lang.RuntimeException:
Unable to instantiate service com.example.demoservice.DownloadService:
java.lang.InstantiationException:
com.example.demoservice.DownloadService
I have seen many solutions to this type of execption like passing string to constructor etc.But those solutions didnt solved this issue.
Code sample is given below
public class MainActivity extends Activity {
TextView textView ;
private BroadcastReceiver receiver = new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
// TODO Auto-generated method stub
Bundle bundle = intent.getExtras();
if(bundle != null){
String filepath = bundle.getString(DownloadService.FILEPATH);
int result = bundle.getInt(DownloadService.RESULT);
if(result == Activity.RESULT_OK){
Toast.makeText(context, "Sucess" + filepath, Toast.LENGTH_SHORT).show();
}
else{
Toast.makeText(context, "Sucess", Toast.LENGTH_SHORT).show();
}
}
}
};
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textView = (TextView) findViewById(R.id.status);
}
#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 void onClick(View v){
Intent i = new Intent(this, DownloadService.class);
i.putExtra(DownloadService.FILENAME, "index.html");
i.putExtra(DownloadService.URL, "http://www.vogella.com/index.html");
startService(i);
textView.setText("Service started");
}
#Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
registerReceiver(receiver, new IntentFilter(DownloadService.NOTIFICATION));
}
#Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
unregisterReceiver(receiver);
}
}
Service class
public class DownloadService extends IntentService{
private int result = Activity.RESULT_CANCELED;
public static final String URL = "urlpath";
public static final String FILENAME = "filename";
public static final String FILEPATH = "filepath";
public static final String RESULT = "result";
public static final String NOTIFICATION = "com.vogella.android.service.receiver";
public DownloadService(String name) {
super("DownloadService");
// TODO Auto-generated constructor stub
}
#Override
protected void onHandleIntent(Intent intent) {
// TODO Auto-generated method stub
String urlpath = intent.getStringExtra(URL);
String filename = intent.getStringExtra(urlpath);
File output = new File(Environment.getExternalStorageDirectory(), filename);
if(output.exists()){
output.delete();
}
InputStream input = null;
FileOutputStream fout = null;
try {
java.net.URL url = new java.net.URL(urlpath);
input = url.openConnection().getInputStream();
InputStreamReader reader = new InputStreamReader(input);
fout = new FileOutputStream(output.getPath());
int next = -1;
while((next = reader.read())!= -1){
fout.write(next);
}
result = Activity.RESULT_OK;
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
finally{
if(input != null){
try {
input.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if(fout != null){
try {
fout.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
publishResult( output.getAbsoluteFile(), result);
}
private void publishResult(File absoluteFile, int result2) {
// TODO Auto-generated method stub
Intent intent = new Intent(this,DownloadService.class);
intent.putExtra(FILEPATH, absoluteFile);
intent.putExtra(RESULT, result2);
sendBroadcast(intent);
}
}
I am running app using Emulator.Is it possible to run this problem in emulator,because writing to external directory
Can anyone help me?
Use
public DownloadService() {
super("DownloadService");
// TODO Auto-generated constructor stub
}
Instead of
public DownloadService(String name) {
super("DownloadService");
// TODO Auto-generated constructor stub
}
UPDATE:
You have to declare a default constructor which calls the public IntentService (String name) super constructor of the IntentService class you extend. ie. In simple words, you need to provide no-argument constuctor for your service ,without which android wont be able to instantiate your service.
you start the intentservice using startService(your_intent); And as per the documentation
You should not override onStartCommand() method for your
IntentService. Instead, override onHandleIntent(Intent), which the
system calls when the IntentService receives a start request.
IntentService
Hi i want to display progressdialog until a command is executed through telnet.
so i use asynctask for that purpose.
private class AsyncAction extends AsyncTask<String, Void, String>
{
#Override
protected String doInBackground(String... arg0)
{
// TODO Auto-generated method stub
return null;
}
#Override
protected void onPostExecute(String result)
{
// TODO Auto-generated method stub
super.onPostExecute(result);
try
{
telnet.connect("XXX.XXX.XXX.XXX", 23);
// Get input and output stream references
in = telnet.getInputStream();
out = new PrintStream(telnet.getOutputStream());
// Log the user on
readUntil("login:");
write("jk");
readUntil("password:");
write("kk");
// Advance to a prompt
readUntil(prompt + "");
write("ping -t localhost\n");
readUntil(">");
write("cdkk");
AlertDialog.Builder alertbox = new AlertDialog.Builder(TelSampActivity.this);
String msg="work finished!";
alertbox.setMessage(msg);
alertbox.show();
}
catch (Exception e)
{
// TODO: handle exception
}
finally
{
pd.dismiss();
}
// pd.dismiss();
}
#Override
protected void onPreExecute()
{
// TODO Auto-generated method stub
super.onPreExecute();
pd = new ProgressDialog(TelSampActivity.this);
pd.setMessage("loading...");
pd.setIndeterminate(true);
pd.setCancelable(false);
pd.show();
}
}
And i call asynctask in oncreate() like below
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
try{
new AsyncAction().execute();
}catch (Exception e) {
e.printStackTrace();
}
}
The problem is that i could not see progressdialog until command executes.
please help me solve the issue.
Thanks in advance.
EDIT
The code to send and read command
public String readUntil(String pattern) {
try {
char lastChar = pattern.charAt(pattern.length()-1);
StringBuffer sb = new StringBuffer();
boolean found = false;
char ch = (char) in.read();
while (true) {
System.out.print(ch);
sb.append(ch);
if (ch == lastChar)
{
if (sb.toString().endsWith(pattern))
{
if (sb.toString().contains("cdkk"))
{
disconnect();
break;
}
else
{
return sb.toString();
}
}
else
{
disconnect();
break;
}
}
else if(sb.toString().contains("Failed"))
{
AlertDialog.Builder alertbox = new AlertDialog.Builder(TelSampActivity.this);
String error="Invalid username or password!";
alertbox.setMessage(error);
alertbox.setTitle("Error");
alertbox.show();
System.out.println("bad user name");
disconnect();
break;
}
ch = (char) in.read();
}
}
catch (Exception e) {
e.printStackTrace();
}
return null;
}
public void write(String value) {
try {
out.println(value);
out.flush();
System.out.println(value);
}
catch (Exception e) {
e.printStackTrace();
}
}
public String sendCommand(String command) {
try {
write(command);
return readUntil(prompt + " ");
}
catch (Exception e) {
e.printStackTrace();
}
return null;
}
public void disconnect() {
try {
telnet.disconnect();
}
catch (Exception e) {
e.printStackTrace();
}
}
Currently you are trying to do Network operations from onPostExecute because this method called from UI Thread . change your code as to get work in proper way
private class AsyncAction extends AsyncTask<String, Void, String>
{
public static boolean status=false;
#Override
protected String doInBackground(String... arg0)
{
// TODO Auto-generated method stub
try
{
telnet.connect("XXX.XXX.XXX.XXX", 23);
// Get input and output stream references
in = telnet.getInputStream();
out = new PrintStream(telnet.getOutputStream());
// Log the user on
readUntil("login:");
write("jk");
readUntil("password:");
write("kk");
// Advance to a prompt
readUntil(prompt + "");
write("ping -t localhost\n");
readUntil(">");
write("cdkk");
// make status true or false if command successfully executed
status=true;
}
catch (Exception e)
{
// TODO: handle exception
}
return null;
}
#Override
protected void onPostExecute(String result)
{
pd.dismiss();
// check status if true then show AlertDialog
if(status==true){
AlertDialog.Builder alertbox =
new AlertDialog.Builder(TelSampActivity.this);
String msg="work finished!";
alertbox.setMessage(msg);
alertbox.show();
}
else{
// your code here
}
}
#Override
protected void onPreExecute()
{
// TODO Auto-generated method stub
super.onPreExecute();
pd = new ProgressDialog(TelSampActivity.this);
pd.setMessage("loading...");
pd.setIndeterminate(true);
pd.setCancelable(false);
pd.show();
}
}
You need to show the progress bar in onPreExecute() do the work in doInBackground() and then hide the progress bar in onPostExecute(). onPreExecute() and onPostExecute() are both executed on the main thread, where as doInBackground is executed in the background.
You are doing your work on onPostExecute() method which should be inside doInBackground()
show your progress dialog inside onPreExecute() and dismiss inside onPostExecute().