@Override
public void onConfigurationChanged(Configuration newConfig) {
    super.onConfigurationChanged(newConfig);
    mEditTextData = mEditText.getText().tostring();//mEditTextData is a String
                                                   //member variable
    setContentView(R.layout.myLayout);
    initializeViews();
}

private void initializeViews(){
    mEditText = (EditText)findViewById(R.id.edittext1);
    mEdiText.setText(mEditTextData);
}

@Override
protected void onCreate (Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.login_screen);
    ...
    ...
    String userName, password;
    if(savedInstanceState!=null)
    {
        userName = savedInstanceState.getString("user_name");
        password= savedInstanceState.getString("password");
    }

    if(userName != null)
        userNameEdtTxt.setText(userName);
    if(password != null)
        passEdtTxt.setText(password);
}

@Override
    protected void onSaveInstanceState (Bundle outState)
    {
        outState.putString("user_name", userNameEdtTxt.getText().toString());
        outState.putString("password",  passEdtTxt.getText().toString());
    }

public class MyActivity extends Activity {
    private static final String TAG = "com.example.handledataorientationchange.MainActivity";
    private static ProgressDialog progressDialog;
    private static Thread thread;
    private static boolean isTaskRunnig;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Log.d(TAG, "onCreate");
        setContentView(R.layout.main);
        Button button = (Button) findViewById(R.id.button);
        button.setOnClickListener(new EditText.OnClickListener() {

            @Override
            public void onClick(View v) {
                perform();
                isTaskRunnig = true;
            }
        });
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    public void perform() {
        Log.d(TAG, "perform");
        progressDialog = android.app.ProgressDialog.show(this, null,
                "Working, please wait...");
        progressDialog
                .setOnDismissListener(new DialogInterface.OnDismissListener() {

                    @Override
                    public void onDismiss(DialogInterface dialog) {
                        //isTaskRunnig = false;
                    }
                });
        thread = new Thread() {
            public void run() {
                Log.d(TAG, "run");
                int result = 0;
                try {

                    // Thread.sleep(5000);
                    for (int i = 0; i < 20000000; i++) {

                    }
                    result = 1;
                    isTaskRunnig = false;
                } catch (Exception e) {
                    e.printStackTrace();
                    result = 0;
                }
                Message msg = new Message();
                msg.what = result;
                handler.sendMessage(msg);
            };
        };
        thread.start();
    }

    // handler to update the progress dialgo while the background task is in
    // progress
    private static Handler handler = new Handler() {

        public void handleMessage(Message msg) {
            Log.d(TAG, "handleMessage");
            int result = msg.what;
            if (result == 1) {// if the task is completed successfully
                Log.d(TAG, "Task complete");
                try {
                    progressDialog.dismiss();
                } catch (Exception e) {
                    e.printStackTrace();
                    isTaskRunnig = true;
                }

            }

        }
    };

    @Override
    protected void onRestoreInstanceState(Bundle savedInstanceState) {
        super.onRestoreInstanceState(savedInstanceState);
        Log.d(TAG, "onRestoreInstanceState" + isTaskRunnig);
        if (isTaskRunnig) {
            perform();

        }
    }

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        Log.d(TAG, "onSaveInstanceState");
        if (thread.isAlive()) {
            thread.interrupt();
            Log.d(TAG, thread.isAlive() + "");
            progressDialog.dismiss();
        }

    }

android:configChanges="orientation|keyboardHidden">

android:configChanges="orientation|keyboardHidden|screenSize">

@Override
public void onSaveInstanceState (Bundle outState)
{
     outState.putString("editTextData1", editText1.getText().toString());
     outState.putString("editTextData2", editText2.getText().toString());

     super.onSaveInstanceState(outState);
}

@Override
public void onCreate(Bundle savedInstanceState)
{
      super.onCreate();

      ... find references to editText1, editText2

      if (savedInstanceState != null)
      {
           editText1.setText(savedInstanceState.getString("editTextData1");
           editText2.setText(savedInstanceState.getString("editTextData2");
      }
}