Question

I’m trying to created a chat application based on smack library. I think my issue has nothing to do with this library as logcat sends and receives everything correctly. My problem is when i receive a message it does not display. Following is the method i’m using to display text.

public void TextCreating(String message) {

    Log.d("START", "Method Excution started.");

    layout = (LinearLayout) findViewById(R.id.layoutLinear);
    LayoutParams lparams = new LayoutParams(LayoutParams.WRAP_CONTENT,
            LayoutParams.WRAP_CONTENT);
    tv = new TextView(this);
    tv.setLayoutParams(lparams);
    tv.setText(message);
    tv.setTextColor(Color.WHITE);
    Log.d("STARTED", "Text color OK.");
    layout.addView(tv);
    Log.d("STARTED", "Text didsplayed.");
}

This peace of code will be executed as a message received. Those received messages are handled through a listener called PacketListener. This receiving part is working fine. In this listener when i call above TextCreating method it executes up to tv.setTextColor(Color.WHITE); Last line does not executes. What is the reason for this? How can I solve this problem ? Thanks in advance 🙂

EDIT :

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Chat Room"
    android:textAppearance="?android:attr/textAppearanceLarge" />

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginTop="10dp"
    android:text="Chat History :" />

<LinearLayout
    android:id="@+id/layoutLinear"
    android:layout_width="fill_parent"
    android:layout_height="250dp"
    android:orientation="vertical"
    android:background="#000000"
    android:layout_marginLeft="2dp"
    android:layout_marginRight="2dp" >

</LinearLayout>

<EditText
    android:id="@+id/editTextMessage"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginTop="5dp"
    android:ems="10" >

    <requestFocus />
</EditText>

<Button
    android:id="@+id/buttonSend"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="Send" />

</LinearLayout>

Answer 1

First thank u every one for your ideas and helps. I solver this by introducing a Handler to the code. I was trying to do everything in my UI thread. So i modified my code as follows.

private Handler mHandler = new Handler();
public void TextCreating(final String message) {

    mHandler.post(new Runnable() {
        @Override
        public void run() {             
            layout = (LinearLayout) findViewById(R.id.layoutLinear);
            LayoutParams lparams = new LayoutParams(LayoutParams.WRAP_CONTENT,
                    LayoutParams.WRAP_CONTENT);
            tv = new TextView(MUCchat.this);
            tv.setLayoutParams(lparams);
            tv.append(message);
            tv.setTextColor(Color.WHITE);
            layout.addView(tv);
        }
    });     
}

This link helped me a lot to figureout this.
Update textView from thread