I'm trying to fetch my e-mails using IMAP on Android application.
In LogCat, there are a lot of things going on; however, I know why I'm getting those errors. It basically tells me "the application may be doing too much work on its main thread". Hence, I was trying to formulate an asynchronous task for my class responsible for SSLSockets etc.
My interface is like when users hit Login button, they should be able to see their emails under the login button. After that, I'm getting that error in the title. I think I should be able to do something else wrapping around my Login function, but I couldn't find it. There might be some other errors in my code. Please don't worry about it. I just want to fix that asynchronous issue right now
I'd like you to call your attention to the login function a bit below. After the first code, there will be my LoginClient.java code liable for opening connection, communicating with server etc.
Here is my code: (MainActivity.java) (Cropped a bit)
package com.theOwl.android_imap;
import java.util.ArrayList;
import android.app.Activity;
-------------
public class MainActivity extends Activity implements OnItemSelectedListener{
EditText servername, port, username, password;
Spinner dropdown;
Button blogin;
public static ArrayList<String> listModel = new ArrayList<String>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main_activity);
servername = (EditText) findViewById(R.id.servername);
port = (EditText) findViewById(R.id.port);
username = (EditText) findViewById(R.id.username);
password = (EditText) findViewById(R.id.password);
dropdown = (Spinner) findViewById(R.id.sp1);
blogin = (Button) findViewById(R.id.button);
populateListView();
// clickListView();
String[] items = new String[] { "[email protected]" };
ArrayAdapter<String> adapter = new ArrayAdapter<String>(
MainActivity.this, android.R.layout.simple_spinner_item, items);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
dropdown.setAdapter(adapter);
dropdown.setOnItemSelectedListener(this);
blogin.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
login();
}
});
}
public void login(){
String servernameStr = servername.getText().toString();
String portStr = port.getText().toString();
String usernameStr = username.getText().toString();
String passwordStr = password.getText().toString();
new LoginClient().execute(servernameStr, portStr, usernameStr, passwordStr);
//Toast.makeText(MainActivity.this, mySSL_Connection.Mails.size(), 1500).show();
/*for (int i = 0; i < mySSL_Connection.Mails.size(); i++) {
//Placing each e-mail in the given format into the ListModel
listModel.add(mySSL_Connection.Mails.get(i));
}*/
//Toast.makeText(MainActivity.this, listModel.get(0), 1500).show();
}
private void populateListView() {
// TODO Auto-generated method stub
for(int i=0; i<10; i++){
listModel.add("email");
}
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
R.layout.items, listModel);
ListView list = (ListView) findViewById(R.id.listView);
list.setAdapter(adapter);
}
/*private void clickListView() {
// TODO Auto-generated method stub
ListView list = (ListView) findViewById(R.id.listView);
list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// TODO Auto-generated method stub
String servernameStr = servername.getText().toString();
String portStr = port.getText().toString();
String usernameStr = username.getText().toString();
String passwordStr = password.getText().toString();
String eMailBody = mySSL_Connection.getEmailBody(servernameStr, portStr, usernameStr, passwordStr, position);
Body b = new Body();
b.body.setText(eMailBody);
startActivity(new Intent("android.intent.action.BODY"));
switch (position) {
case 0:
Toast.makeText(MainActivity.this, "e-mail 1", 1500).show();
break;
case 1:
Toast.makeText(MainActivity.this, "e-mail 2", 1500).show();
break;
case 2:
Toast.makeText(MainActivity.this, "e-mail 3", 1500).show();
break;
default:
break;
}
}
});
}*/
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position,
long id) {
// TODO Auto-generated method stub
switch (position) {
case 0:
servername.setText("imap.gmail.com");
port.setText("993");
username.setText("[email protected]"); //Demonstration
password.setText("*******");
break;
default:
break;
}
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
// TODO Auto-generated method stub
}
}
Here is LoginClient.java. I'm going to crop that one a bit since I think there are some unrelated parts about my question not to confuse you. That's also because its background is complicated
import javax.net.ssl.SSLSocket;
import javax.net.ssl.SSLSocketFactory;
import android.os.AsyncTask;
public class LoginClient extends AsyncTask<String, Integer, String>{
private String response;
public List<String> Mails;
public String [] emailBody;
public String emre ="";
//LoginClient Constructor with four parameters
protected String doInBackground(String... params) {
/* open SSLSocket connection to server, send login, do the other necessary steps to
obtain the e-mails in the server (Subject From Date)
*/
try {
// obtain SSLSocketFactory for creating SSLSockets
SSLSocketFactory socketFactory = (SSLSocketFactory) SSLSocketFactory
.getDefault(); // To be able to create SSL Sockets to secure
// the exchange
System.out.println("Im here for the first time!");
// create SSLSocket from factory
SSLSocket socket = (SSLSocket) socketFactory.createSocket(
params[0], Integer.parseInt(params[1]));
System.out.println("Im here for the second time!");
// create BufferedReader for reading server response
BufferedReader input = new BufferedReader(new InputStreamReader(
socket.getInputStream()));
System.out.println("Im here for the third time!");
// create PrintWriter for sending login, selecting folder, fetching e-mails
PrintWriter output = new PrintWriter(new OutputStreamWriter(
socket.getOutputStream()));
System.out.println("Im here for the fourth time!");
// This conversion is needed from Char[] to String
String newpassword = new String(params[3]);
System.out.println("Im here for the fifth time!");
// Authentication requested after Handshake
String login = "tag login " + params[2] + " " + newpassword;
System.out.println("Im here for the sixth time!");
// Send the request to server
output.print(login + "\r\n");
output.flush(); // Flush is to make sure that we send requests to server besides using 'print' function
System.out.println("Im here for the seventh time!");
/* There are more than input.readLine()s since we need to skip some lines
* This logic exists in the other parts of the entire code
* depending on some logic
* */
response = input.readLine();
System.out.println("Im here for the eighth time!");
response = input.readLine();
response = input.readLine();
************** //THIS MEANS I CROPPED THE CODE. WE HAVE NOTHING TO DO WITH THIS PART
System.out.println("System successfully initiated!");
// Clean up streams and SSLSocket
output.close();
input.close();
socket.close();
} catch (Exception e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
System.out.println("Program Terminates");
}
for (int i = 0; i < Mails.size(); i++){
emre += Mails.get(i) + "$";
}
return emre;
}
//THIS FUNCTION BELOW IS AUTOMATICALLY INVOKED AFTER doInBackground FUNCTION IS DONE
protected void onPostExecute(String result) {
/* "Invoked on the UI (User Interface) thread after the background
computation finishes. The result of the background computation passed to this step
as a parameter resulting in showing the result */
//for( int i = 0; i < emre.length(); i++ ){
MainActivity.listModel.add(emre);
// }
}
Your help would be highly great. Thanks in advance!
