Question

I have a client server program using sockets, one android tablet is server and the other android is client. it works fine in the first example shown below where i am sending a simple message, but in the second example below i tried to use an if statement and it does not work. I wonder why this is?

receivedCommand is the textView

here is the first example that works with no problems

public String line = null;
try {
  BufferedReader in = new BufferedReader(new InputStreamReader(client.getInputStream()));

  while ((line = in.readLine()) != null) {
    Log.d("ServerActivity", line);
    handler.post(new Runnable() {
      @Override
      public void run() {
        receivedCommand.setText(line);
      }
    });
  }

now for the second example that does not work when using the if statement

public String line = null;
try {

  BufferedReader in = new BufferedReader(new InputStreamReader(client.getInputStream()));

  while ((line = in.readLine()) != null) {
    Log.d("ServerActivity", line);
    handler.post(new Runnable() {
      @Override
      public void run() {
        //receivedCommand.setText(line);

        if(line.equals("test")){
          receivedCommand.setText("test received"); 
        }

      }
    });
  }

Answer 1

Seems all you had to do was

line.trim().equals("test"))

Always trim() when getting a String from other sources, it might just have whitespace where you don’t expect it and cause the comparison to return false.