I have used Async task to send a mail when user presses the button "b" but its showing an error and the error is "Error while executing doInBackground" and "First Activity has leaked a Window"
public class FirstActivity extends Activity implements OnClickListener
{
Button b;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
b=(Button)findViewById(R.id.button);
b.setOnClickListener(this);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
#Override
public void onClick(View v) {
ProgressDialog progress = new ProgressDialog(this);
progress.setMessage("Loading...");
new MyTask(progress).execute();
Intent i=new Intent(this,newclass.class);
startActivity(i);
}
// TODO Auto-generated method stub
public class MyTask extends AsyncTask<Void, Void, Void> {
private ProgressDialog progress;
public MyTask(ProgressDialog progress)
{
this.progress = progress;
}
public void onPreExecute()
{
super.onPreExecute();
progress.show();
}
public Void doInBackground(Void... unused)
{
String detail="sending mmail";
new MainActivity(detail);
return null;
}
public void onPostExecute(Void unused)
{
progress.dismiss();
}
}
}
try to use this method in doInBackground...
public Void doInBackground(Void... unused)
{
runOnUiThread(new Runnable()
{
public void run()
{
// TODO Auto-generated method stub
String detail="sending mmail";
new MainActivity(detail);
return null;
}
});
}
You are trying to navigate to a new Activity, MainActivity, while the ProgressDialog is still on. That is causing the memory leak.
The error is because you are starting a new activity immediately after starting your progress dialog (the dialog loses its context).
You need to move it to onPostExecute().
public void onPostExecute(Void unused){
progress.dismiss();
Intent i = new Intent(this,newclass.class);
startActivity(i);
}
Related
I'm developing an app that when user clicks on a Button it executes an Asynctask that this class calls a method at it's onPostExecute method that calls another Asynctask! It works when user clicks once, but at the second time it crashes and says Cannot execute task: the task has already been executed (a task can be executed only once)
.
public class Test extends Activity {
A a;
B b;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.test);
Button btn = (Button) findViewById(R.id.btn);
btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View arg0) {
a = new A();
a.execute();
}
});
}
class A extends AsyncTask<Void, Void, Void> {
#Override
protected Void doInBackground(Void... arg0) {
// doing st
return null;
}
#Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
runB();
a.cancel(true);
}
}
public void runB() {
b = new B();
b.execute();
}
class B extends AsyncTask<Void, Void, Void> {
#Override
protected Void doInBackground(Void... arg0) {
// doing st
return null;
}
#Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
//doing st
b.cancel(true);
}
}
Use AsyncTask.Status for checking status of AsyncTask before calling AsyncTask.execute() method on Button onClick:
#Override
public void onClick(View arg0) {
if(a ==null){
a = new A();
a.execute();
}
}
And in onPostExecute of B class assign null to a :
#Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
//doing st
b.cancel(true);
a=null;
}
How to show a dialog box in AsyncTask. Getting BadToketException in dialog.show();
I tried many ways but I could not solve it.
Also tried to pass context to the dialog box in different ways, but it is giving me the same result.
public class RetriveStock extends AsyncTask<Void, Void, Void> {
#Override
protected Void doInBackground(Void... params) {
message = client.clientReceive(1); // I get data here.
return null;
}
#Override
protected void onCancelled() {
super.onCancelled();
}
#Override
protected void onPostExecute(Void result) {
if (message.contains("AlertExecuted:")) {
final Dialog dialog = new Dialog(CreateAlert.this);
dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
dialog.setContentView(R.layout.display_dialog);// Dialog layout
TextView dialogText = (TextView) dialog.findViewById(R.id.digMsg);
dialogText.setText("Alert Executed!");
Button ok = (Button) dialog.findViewById(R.id.ok);
ok.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
dialog.dismiss();
}
});
try {
dialog.show(); //WindowManager$BadTokenException
} catch (Exception e) {
e.printStackTrace();
}
}
super.onPostExecute(result);
}
#Override
protected void onPreExecute() {
super.onPreExecute();
}
#Override
protected void onProgressUpdate(Void... values) {
super.onProgressUpdate(values);
}
}
Please help.
protected void onPreExecute() {
// TODO Auto-generated method stub
// progressDialog = ProgressDialog.show(this, "", "loading news content");
progressDialog = new ProgressDialog(context , AlertDialog.THEME_HOLO_LIGHT);
progressDialog.setMessage(""+getString(R.string.laodnews));
progressDialog.setIndeterminateDrawable(getResources().getDrawable(R.drawable.animate));
progressDialog.setCancelable(false);
progressDialog.show();
}
start dailoge in pre execute and stop in onpostexecute..
is CreateAlert registered activity in manifest..if not then you have to pass registered activity context
I want to show a progressDialog on my page when the user clicks on the button.On click of button i am sorting my results that is a List.Now how can we show a progressDialog on click of a button.Please suggest me
This function i am using to sort that data :
public void sortByDate(View v) {
Collections.sort(tripParseData.getDetails());
setData(tripParseData);
}
After #Monica Suggestion
public void sortByDate(View v) {
new LoadData().execute();
}
class LoadData extends AsyncTask<Void, Void, Void> {
#Override
protected void onPreExecute() {
super.onPreExecute();
progressDialog.show();
}
#Override
protected Void doInBackground(Void... params) {
Collections.sort(tripParseData.getCoroprateBookingDetails());
return null;
}
#Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
progressDialog.dismiss();
setApprovalDetailsData(tripParseData);
}
}
you have to call progressdiolog.show before the long calculation starts and then the calculation has to run in a separate thread. A soon as this thread is finished, you have to call pd.dismiss() to close the prgoress dialog.
here you can see an example:
the progressdialog is created and displayed and a thread is called to run a heavy calculation:
Override
public void onClick(View v) {
pd = ProgressDialog.show(lexs, "Search", "Searching...", true, false);
Search search = new Search( ... );
SearchThread searchThread = new SearchThread(search);
searchThread.start();
}
and here the thread:
private class SearchThread extends Thread {
private Search search;
public SearchThread(Search search) {
this.search = search;
}
#Override
public void run() {
search.search();
handler.sendEmptyMessage(0);
}
private Handler handler = new Handler() {
#Override
public void handleMessage(Message msg) {
displaySearchResults(search);
pd.dismiss();
}
};
}
Don't forget to vote me up :)
Paste This Class in ur activity and call new LoadData().execute to start the prgress dialog :
class LoadData extends AsyncTask<Void, Void, Void> {
#Override
protected void onPreExecute() {
super.onPreExecute();
ProgressDialog pg=new ProgressDialog(ChartsActivity.this);
pg=pg.show(ChartsActivity.this, "Loding", "Plz Wait...");
}
#Override
protected Void doInBackground(Void... params) {
sortByDate();
}
#Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
pg.dismiss();
}
}
I have not tested it but I think it can help you.
Declare these two objects in your class and member variables.
Thread thread = null;
ProgressDialog bar = null;
Use this logic on your button click listener it can work in your case. I have not tested it but It will give you Idea how things should work. you can also use handlemessage in place of runonuithread
if (thread == null
|| (thread != null && !thread.isAlive())) {
thread = new Thread(new Runnable() {
#Override
public void run() {
runOnUiThread(new Runnable() {
#Override
public void run() {
//DISPLAY YOUR PROGRESS BAR HERE.
bar = ProgressDialog.show(getApplicationContext(), "LOADING..", "PLEASE WAIT..");
}
});
// SORT COLLECTION HERE
runOnUiThread(new Runnable() {
#Override
public void run() {
//CLOSE YOUR PROGRESS BAR HERE.
bar.dismiss();
}
});
}
});
thread.start();
}
Hope this will help you.
try to use AsyncTask http://developer.android.com/reference/android/os/AsyncTask.html
Sample code:
AsyncTask<Void, Void, Void> task = new AsyncTask<Void, Void, Void>() {
#Override
protected void onPreExecute() {
//Show UI
//Start your progress bar
showProgress();
}
#Override
protected Void doInBackground(Void... arg0) {
// do your sorting process
return null;
}
#Override
protected void onPostExecute(Void result) {
//Show UI
//dismiss your progress bar
hideProgress();
}
};
task.execute((Void[])null);
Show and hide progress code
public void showProgress() {
progressDialog = ProgressDialog.show(this, "",
"Loading. Please wait...");
progressDialog.setCancelable(false);
}
public void hideProgress() {
if (progressDialog != null && progressDialog.isShowing()) {
progressDialog.dismiss();
}
I use a processDialog while creating a charts, the processDialog appears but dont spin. I searched and I need use Async Task, but I dont have where I have to put the code:
This is my code:
bCrearGraf2.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
startProgressDialog(v);
irGraficaComparativa(null);
}
});
startProgressDialog() is this:
public void startProgressDialog(View V)
{
progressBar = new ProgressDialog(V.getContext());
progressBar.setCancelable(true);
progressBar.setIndeterminate(true);
progressBar.setMessage("Creating chart");
progressBar.setProgressStyle(ProgressDialog.STYLE_SPINNER);
progressBar.show();
}
irGraficaComparativa() start the new activity:
public void irGraficaComparativa(View view){
Intent i =new Intent(this,Graficas_comparativa.class);
i.putExtra("Id_vehiculo1",idVehChar1);
i.putExtra("Nomb_vehiculo1",nombVeh1);
i.putExtra("Id_vehiculo2",idVehChar2);
i.putExtra("Nomb_vehiculo2",nombVeh2);
Log.d("Veh1","Nombre: " + nombVeh1 + " ID: " + idVehChar1);
Log.d("Veh1","Nombre: " + nombVeh2 + " ID: " + idVehChar2);
startActivity(i);
}
Into the activity I create a AsyncTask class, but I dont know where put the code.
This the AsyncTask class:
public class ProgressTask extends AsyncTask <Void,Void,Void>{
#Override
protected void onPreExecute(){
}
#Override
protected Void doInBackground(Void... arg0) {
// TODO Auto-generated method stub
return null;
}
#Override
protected void onPostExecute(Void result) {
progressBar.dismiss();
}
}
thanks a lot.
Try this,
public class ProgressTask extends AsyncTask <Void,Void,Void>
{
#Override
protected void onPreExecute()
{
startProgressDialog(v);
}
#Override
protected Void doInBackground(Void... arg0)
{
// TODO Auto-generated method stub
return null;
}
#Override
protected void onPostExecute(Void result)
{
progressBar.dismiss();
irGraficaComparativa(null);
}
}
In here the progress bar is useless so try below linkProgress bar in android
I am developing an application in android, where i need to display a splash screen and at the same time there will be server communication. The problem here is when i launch the app, first application is communicating with the server and then it is displaying the splash screen. I want to both server communication and splash screen at the same time.
The following is my code:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.splash_screen);
try {
Thread thread = new Thread(this);
thread.start();
thread.join();
//Attractions
CommonMethods.getSystemOutput("Response Json Array String Attractions:::"+jArrayMobileAttractions);
attractionsDate = JsonParsing.getLatestDate(jArrayMobileAttractions);
attractionsDate = getDate(attractionsDate);
CommonMethods.getSystemOutput("Attractions Date:::::"+attractionsDate);
//Categories
CommonMethods.getSystemOutput("Response Json Array String Categories:::"+jArrayCategories);
categoryDate = JsonParsing.getLatestDate(jArrayCategories);
categoryDate = getDate(categoryDate);
CommonMethods.getSystemOutput("Category date:::"+categoryDate);
//Contacts
CommonMethods.getSystemOutput("Response Json Array String Contacts:::"+jArrayContacts);
contactsDate = JsonParsing.getLatestDate(jArrayContacts);
contactsDate = getDate(contactsDate);
CommonMethods.getSystemOutput("Contacts Date:::"+contactsDate);
} catch (Exception e) {
CommonMethods.getSystemOutput("Exception in Splash screen thread:::"+e);
}
}
public void run() {
// if (attractionsDate == null) {
jArrayMobileAttractions = RequestHandler.getJSONfromURL(Constants.MOBILE_ATTRACTIONS_URL);
jArrayCategories = RequestHandler.getJSONfromURL(Constants.CATEGORY_URL);
jArrayContacts = RequestHandler.getJSONfromURL(Constants.CONTACTS_URL);
// } else {
// jArrayMobileAttractions = RequestHandler.getJSONfromURL(Constants.MOBILE_ATTRACTIONS_URL+"?lastupdateddate="+attractionsDate);
// }
}
You can use the AsynchTask Manager in which it has a method
private class DownloadWebPageTask extends AsyncTask<String, Void, String> {
#Override
protected String doInBackground(String... urls) {
// Do Server Interaction Here
return response;
}
#Override
protected void onPreExecute(String result) {
//Show your Splash Screen
}
#Override
protected void onPostExecute(String result) {
//Gone the Splash Screen view
}
}
For this purpose it will be better start from "SplashActivity" - in onCreate() start new Thread for communication with server, and when all communication finished - call startActivityForResult(mainActivityIntent). For correct behavior back button finish splash activity on finish main activity. Approximate code:
public class SplashActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//setup view for activity
new Thread(new Runnable() {
public void run() {
// do here some long operation
startActivityForResult(new Intent(SplashActivity.this, MainActivity.class), 0);
}
}).start();
}
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
finish();
}
}
I had the same thing to do and I did it this way and it works just fine. I had to show the splashscreen and download some file from the server, unzip it, move files insto proper directories and then start the apps main screen. Here is the code, I used AsyncTask.
So, you have three AsyncTask classes, one for each task and in the onPostExecute() I call the next AsyncTask. I can't say if this is the best way but it works for me.
I removed unneccessary code but for clarity I left a call to a dialog where I ask a user ih he wants to proceed with downloading as it may take a while. Also I check if FIRST_RUN is true just so I know if I should download the package since for my app I need to do it only the first time, so if it is true I do the spashscreen activities and if it is false I proceed to MAINAPP activity.
Hope it helps.
public class SplashScreen extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.splashscreen);
SharedPreferences settings = getSharedPreferences(PREFS_NAME,0);
boolean firstRun = settings.getBoolean("FIRST_RUN", true);
if (firstRun) {
showDialog(INITIAL_DLG);
} else {
startActivity(new Intent(appContext, MAINAPP.class));
}
}
/***
* First entry after YES on Dialog!
*/
protected void initialize() {
messageTV.setVisibility(TextView.VISIBLE);
progressBar.setVisibility(ProgressBar.VISIBLE);
downloadThread = new DownloadFiles();
downloadThread.execute();
}
protected void rollback() {
}
#Override
protected Dialog onCreateDialog(int id) {
AlertDialog.Builder builder;
switch (id) {
case INITIAL_DLG:
builder = new AlertDialog.Builder(this);
builder.setMessage(R.string.app_setup)
.setCancelable(false)
.setPositiveButton(R.string.yes, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
initialize();
}
})
.setNegativeButton(R.string.no, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
finish();
}
});
alertDlg = builder.create();
return alertDlg;
default:
return null;
}
}
protected class DownloadFiles extends AsyncTask<String, Integer, Boolean> {
#Override
protected Boolean doInBackground(String... params) {
try {
//file download
} catch (Exception e) {
result = false;
}
return true;
}
#Override
protected void onProgressUpdate(Integer... values) {
super.onProgressUpdate(values);
progressBar.setProgress(values[0]);
}
#Override
protected void onPostExecute(Boolean result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
unzipThread = new DecompressZipFile();
unzipThread.execute();
}
#Override
protected void onPreExecute() {
// TODO Auto-generated method stub
messageTV.setText("Step 1/4:Downloading data...");
progressBar.setProgress(0);
progressBar.setMax(100);
super.onPreExecute();
}
}
protected class DecompressZipFile extends AsyncTask<String, Integer, Boolean> {
#Override
protected Boolean doInBackground(String... params) {
try {
//unzip files
return true;
} catch(Exception e) {
return false;
}
}
#Override
protected void onProgressUpdate(Integer... values) {
super.onProgressUpdate(values);
if (values[0]<0) progressBar.setMax(values[0]*-1);
else progressBar.setProgress(values[0]);
}
#Override
protected void onPostExecute(Boolean result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
moveDBThread = new MoveDBFile();
moveDBThread.execute();
}
#Override
protected void onPreExecute() {
// TODO Auto-generated method stub
messageTV.setText("Step 2/4:Decompressing data...");
progressBar.setProgress(0);
progressBar.setMax(100);
super.onPreExecute();
}
}
protected class MoveDBFile extends AsyncTask<String, Integer, Boolean> {
#Override
protected Boolean doInBackground(String... params) {
try {
//moving files
return true;
} catch (Exception e) {
globalE = e;
finish();
return false;
}
}
#Override
protected void onPreExecute() {
messageTV.setText("Step 3/4:Shufflin'...");
progressBar.setProgress(0);
progressBar.setMax(100);
super.onPreExecute();
}
#Override
protected void onProgressUpdate(Integer... values) {
super.onProgressUpdate(values);
progressBar.setProgress(values[0]);
}
#Override
protected void onPostExecute(Boolean result) {
super.onPostExecute(result);
if (result) {
getSharedPreferences(PREFS_NAME,0).edit().putBoolean("FIRST_RUN", false).commit();
startActivity(new Intent(appContext, MAINAPP.class));
} else {
rollback();
}
}
}
}