I'm trying to come up with an android client app that talks with a C#server. I want to update my TextView simultaneously with the server reply message. I'm receiving message with this code
public class LogedInActivity extends ActionBarActivity {
private Spinner meterBrands;
private EditText sayacNo,plcNo;
private String serverMessage="Message is";
private TextView serverStatus;
private String messageID="120";
private String messageEnd="*?/";
private Thread clientThread;
private static final int SERVERPORT = sss;
private static final String SERVER_IP = "sss";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_loged_in);
serverStatus= (TextView) findViewById(R.id.serverStatus);
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment()).commit();
}
}
public void sendMessage(View view) {
hideSoftKeyboard(this);
meterBrands= (Spinner) findViewById(R.id.brandsSpinner);
String temp=String.valueOf(meterBrands.getSelectedItem());
if(isValidMeterAndPLC()){
new Thread(new Runnable() {
public void run() {
connectSocket(messageToSend());
}
}).start();
} else {
new Thread(new Runnable() {
public void run() {
connectSocket("1");
}
}).start();
}
}
private String connectSocket(String message){
String finalText = "";
try {
InetAddress serverAddr = InetAddress.getByName(SERVER_IP);
Log.d("TCP", "C: Connecting...");
Socket socket = new Socket(serverAddr, SERVERPORT);
PrintWriter out = null;
BufferedReader in = null;
try {
Log.d("TCP", "C: Sending: '" + message + "'");
out = new PrintWriter( new BufferedWriter( new OutputStreamWriter(socket.getOutputStream())),true);
in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
out.println(message);
String text = "";
while ((text = in.readLine()) != null) {
finalText += text;
serverStatus.setText(finalText);
}
Log.d("TCP", "C: Sent.");
Log.d("TCP", "C: Done.");
} catch(Exception e) {
Log.e("TCP", "S: Error", e);
} finally {
socket.close();
}
} catch (UnknownHostException e) {
// TODO Auto-generated catch block
Log.e("TCP", "C: UnknownHostException", e);
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
Log.e("TCP", "C: IOException", e);
e.printStackTrace();
}
return finalText;
}
public String messageToSend(){
String infoString;
sayacNo= (EditText) findViewById(R.id.sayacNoTextBox);
plcNo= (EditText) findViewById(R.id.plcNoTextBox);
infoString= messageID+"-"+sayacNo.getText()+"-"+meterBrands.getSelectedItem().toString()+"-"+plcNo.getText()+ "-" +messageEnd+"-" ;
infoString+=checkSum(infoString);
return infoString;
}
public int checkSum(String str){
int checkSum=0;
char [] strChars= str.toCharArray();
for(int i=0;i<strChars.length;i++){
checkSum+= (int) strChars[i];
}
return checkSum;
}
public void messageDisplay(String servermessage){
serverStatus= (TextView) findViewById(R.id.serverStatus);
serverStatus.setText(servermessage);
}
private boolean isValidMeterAndPLC(){
boolean check=true;
int sayacNoInt=0;
sayacNo=(EditText) findViewById(R.id.sayacNoTextBox);
plcNo=(EditText) findViewById(R.id.plcNoTextBox);
sayacNoInt=Integer.parseInt(sayacNo.getText().toString());
if(sayacNoInt<100 || sayacNoInt>65530){
alertbox("Yanlış Sayaç Numarası","Yanlış sayaç numarası girdiniz. Lütfen tekrar deneyin.");
check=false;
}
if(plcNo.getText().toString().length()!=8){
alertbox("Yanlış PLC Numarası","Yanlış PLC numarası girdiniz. Lütfen tekrar deneyin.");
check=false;
}
return check;
}
protected void alertbox(String title, String mymessage)
{
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(
this);
// set title
alertDialogBuilder.setTitle(title);
// set dialog message
alertDialogBuilder
.setMessage(mymessage)
.setCancelable(false)
.setPositiveButton("Okay",new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,int id) {
// if this button is clicked, close
// current activity
}
});
// create alert dialog
AlertDialog alertDialog = alertDialogBuilder.create();
// show it
alertDialog.show();
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
public PlaceholderFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_loged_in,
container, false);
return rootView;
}
}
@Override
public boolean onTouchEvent(MotionEvent event) {
hideSoftKeyboard(this);
return false;
}
/*back button override.
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
alertbox("asasda","5333434");
return true;
}
return super.onKeyDown(keyCode, event);
}
*/
public static void hideSoftKeyboard(Activity activity) {
InputMethodManager inputMethodManager = (InputMethodManager) activity.getSystemService(Activity.INPUT_METHOD_SERVICE);
inputMethodManager.hideSoftInputFromWindow(activity.getCurrentFocus().getWindowToken(), 0);
}
}
However, I can't update my TextView since it's in a thread
new Thread(new Runnable() {
public void run() {
connectSocket(messageToSend());
}
}).start();
Simply wrap the sentence where you update with the runOnUiThread() statement. For instance:
your_context.runOnUiThread(new Runnable() {
public void run() {
myTextView.setText("...");
}
});
Anything wrapped in the runOnUiThread() statement will actually be run in the main UI Thread, so be careful to not add some expensive operations here.
---- EDIT ----
new Thread(new Runnable() {
public void run() {
connectSocket(messageToSend());
// Do whatever you need
...
// Once you want to update your TextView...
final myTextView tv = (TextView) your_context.findViewById(R.id.myTextView);
final String myText = "whatever";
your_context.runOnUiThread(new Runnable() {
public void run() {
myTextView.setText(myText);
}
});
}
}).start();