How do I return a boolean from AsyncTask?

Question

I have some EditTexts that a user enters an ftp address, username, password, port anda testConnection button. If a connection is successfully estabished it returns a boolean value of true.

boolean status = ftpConnect(_address, _username, _password,_port);                 ftpDisconnect();                  if (status == true) {                  Toast.makeText(SiteManager.this, "Connection Succesful",                  Toast.LENGTH_LONG).show();                  } else {                  Toast.makeText(SiteManager.this,                  "Connection Failed:" + status, Toast.LENGTH_LONG).show();                   }  

I'm reworking my code to use AsyncTasks to perform the various ftp operations, but how can I pass back a boolean value if a connection is successfully made?

testConnection.setOnClickListener(new OnClickListener() {              @Override             public void onClick(View v) {                 _name = etSitename.getText().toString();                 _address = etAddress.getText().toString();                 _username = etUsername.getText().toString();                 _password = etPassword.getText().toString();                 _port = Integer.parseInt(etPort.getText().toString());                  AsyncConnectTask task = new AsyncConnectTask(SiteManager.this,                         _address, _username, _password, _port);                 task.execute();                 // boolean status = ftpConnect(_address, _username, _password,                 // _port);                 // ftpDisconnect();                  // if (status == true) {                 // Toast.makeText(SiteManager.this, "Connection Succesful",                 // Toast.LENGTH_LONG).show();                 // savesite.setVisibility(0);                 // } else {                 // Toast.makeText(SiteManager.this,                 // "Connection Failed:" + status, Toast.LENGTH_LONG)                 // .show();                  // }             }         }); 

And my AsyncTask

public class AsyncConnectTask extends AsyncTask<Void, Void, Void> {     private Context mContext;     private FTPHelper ftpHelper = new FTPHelper();     private String _address;     private String _user;     private String _pass;     private int _port;     ProgressDialog progressDialog;      public AsyncConnectTask(Context context, String address, String user,             String pass, int port) {         mContext = context;         _address = address;         _user = user;         _pass = pass;         _port = port;     }      // declare other objects as per your need     @Override     protected void onPreExecute() {         progressDialog = ProgressDialog.show(mContext, "Please wait for ",                 "Process Description Text", true);          // do initialization of required objects objects here     };      @Override     protected Void doInBackground(Void... params) {          boolean status = ftpHelper.ftpConnect(_address, _user, _pass, _port);         return null;     }      @Override     protected void onPostExecute(Void result) {         super.onPostExecute(result);         progressDialog.dismiss();     }; } 

Answer 1

public interface MyInterface {     public void myMethod(boolean result); }  public class AsyncConnectTask extends AsyncTask<Void, Void, Boolean> {      private MyInterface mListener;       public AsyncConnectTask(Context context, String address, String user,         String pass, int port, MyInterface mListener) {         mContext = context;         _address = address;         _user = user;         _pass = pass;         _port = port;         this.mListener  = mListener;     }      @Override     protected Boolean doInBackground(Void... params) {         ....         return result;    }       @Override     protected void onPostExecute(Boolean result) {         if (mListener != null)              mListener.myMethod(result);     } }  AsyncConnectTask task = new AsyncConnectTask(SiteManager.this,                         _address, _username, _password, _port,  new MyInterface() {     @Override     public void myMethod(boolean result) {         if (result == true) {             Toast.makeText(SiteManager.this, "Connection Succesful",             Toast.LENGTH_LONG).show();         } else {             Toast.makeText(SiteManager.this, "Connection Failed:" + status, Toast.LENGTH_LONG).show();         }      } });  task.execute(); 

If you call myMethod from onPostExecute the code inside it will run on the UI Thread. Otherwise you need to post a Runnable through a Handler

Answer 2

public class AsyncConnectTask extends AsyncTask<Void, Void, Boolean> {  @Override     protected Boolean doInBackground(Void... params) {                ....                return true; /* or false */ }   @Override     protected void onPostExecute(Boolean result) {            // result holds what you return from doInBackground     } }