public class MainActivity extends Activity implements OnClickListener, Runnable {
Context context;

EditText editTextNum, editText, editUserName, editPassword;
Button btnsend;
ProgressDialog pd;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    this.requestWindowFeature(Window.FEATURE_NO_TITLE);
    setContentView(R.layout.activity_main);
    editUserName = (EditText) findViewById(R.id.edit_userName);
    editPassword = (EditText) findViewById(R.id.edit_password);
    editTextNum = (EditText) findViewById(R.id.edit_number);
    editText = (EditText) findViewById(R.id.edit_message);
    btnsend = (Button) findViewById(R.id.btnsend);
    btnsend.setOnClickListener(this);
}

/** Called when the user clicks the Send button */
public void sendMessage() {
    if (!isOnline()) {
        Toast.makeText(MainActivity.this,"No Internet Access..Cannot Send SMS", Toast.LENGTH_LONG).show();
    } else {
        String userName = editUserName.getText().toString();
        String password = editPassword.getText().toString();
        String number = editTextNum.getText().toString();
        String message = editText.getText().toString();
        String msgreciever = number;
        String testMessage = message;
        try {
            SmsSender.sendMessage(msgreciever, testMessage, userName, password);
        } catch (Exception ex) {
            Toast.makeText(MainActivity.this, "SMS Sending Failed.",Toast.LENGTH_LONG).show();
        }

    }
}

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

public boolean isOnline() {
    ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo netInfo = cm.getActiveNetworkInfo();
    if (netInfo != null && netInfo.isConnectedOrConnecting()) {
        return true;
    }
    return false;
}

public void onClick(View v) {
    // TODO Auto-generated method stub
    if (v == btnsend) {
        if (!isOnline()) {
            Toast.makeText(MainActivity.this,"No Internet Access..Cannot Send SMS",Toast.LENGTH_LONG).show();
        } else {
            pd = ProgressDialog.show(MainActivity.this, "Free Sms","Sending SMS..Please Wait..!!", true);
            Thread t = new Thread(this);
            t.start();
        }

    }
}

public void run() {
    // TODO Auto-generated method stub
    sendMessage();
    mHandler.sendEmptyMessage(0);
}

public Handler mHandler = new Handler() {
    @Override
    public void handleMessage(Message msg) {
        // TODO Auto-generated method stub
        super.handleMessage(msg);
        pd.dismiss();
        Toast.makeText(MainActivity.this, "Message Sent Successfully",Toast.LENGTH_LONG).show();
        editTextNum.setText("");
        editText.setText("");
        editTextNum.requestFocus();
    }
};
}

Handler mHandler = new Handler(Looper.getMainLooper());

Runnable myRunnable = new Runnable() {
 public void run() {work here...}
}

...elsewhere

mHandler.post(myRunnable);