public class MainActivity extends AppCompatActivity 
{
public List<CharSequence> chat = new ArrayList<CharSequence>();

private void connect(final String ip, final int port) {

        Thread thread = new Thread(new Runnable() {
				@Override
				public void run() {

					try {
						InetAddress addr = InetAddress.getByName(ip);
						SocketAddress sockaddr = new InetSocketAddress(addr.getHostAddress(), port);
						
                                         catch (Exception e) {
						if(tabLayout.getSelectedTabPosition() == 0){
							chat.add(Html.fromHtml("<br><font color='red'>" + getString(R.string.coneccionFallida) + "</font>")); //Cuando cambio de pestaña, el texto no es mostrado en el EditText
						}
						else{
							try{
								 
								runOnUiThread(new Runnable() {

										@Override
										public void run() {
											secondFragment.chat.append(Html.fromHtml("<br><font color='red'>" + getString(R.string.coneccionFallida) + "</font>")); //funciona bien
										}
									});
							}
							catch(Exception e2){
								
							}
						}
					}
				}
			});

        thread.start();
	}
}

EditText chat;
	
	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container,
							 Bundle savedInstanceState) {
// Inflate the layout for this fragment
		View view = inflater.inflate(R.layout.chat, container, false);
		chat = (EditText) view.findViewById(R.id.chatEditText1); 
		if(!((MainActivity) getActivity()).chat.isEmpty()){
			appenText(((MainActivity) getActivity()).chat);
			((MainActivity) getActivity()).chat.clear();
		}
		return view;
	}
	
	public void appenText(List<CharSequence> l){
		for(int f=0; f<l.size(); f++){
			chat.append(l.get(f)); //Agrega Strings pero no objetos de tipo Spanned
		}
	}

package com.mycompany.myapp;

import android.app.*;
import android.os.*;
import android.app.TabActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TabHost;
import android.widget.Toast;

public class MainActivity extends Activity 
{
    
	
	@Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
		
		TabHost tabHost = (TabHost) findViewById(android.R.id.tabhost); // initiate TabHost
        TabHost.TabSpec spec; // Reusable TabSpec for each tab
        Intent intent; // Reusable Intent for each tab

        spec = tabHost.newTabSpec("home"); // Create a new TabSpec using tab host
        spec.setIndicator("HOME"); // set the “HOME” as an indicator
        // Create an Intent to launch an Activity for the tab (to be reused)
        intent = new Intent(this, personalActivity.class);
        spec.setContent(intent);
        tabHost.addTab(spec);

        // Do the same for the other tabs

        spec = tabHost.newTabSpec("About"); // Create a new TabSpec using tab host
        spec.setIndicator("ABOUT"); // set the “ABOUT” as an indicator
        // Create an Intent to launch an Activity for the tab (to be reused)
        intent = new Intent(this, chatActivity.class);
        spec.setContent(intent);
        tabHost.addTab(spec);
        //set tab which one you want to open first time 0 or 1 or 2
        tabHost.setCurrentTab(1);
        tabHost.setOnTabChangedListener(new TabHost.OnTabChangeListener() {
				@Override
				public void onTabChanged(String tabId) {
					// display the name of the tab whenever a tab is changed
					Toast.makeText(getApplicationContext(), tabId, Toast.LENGTH_SHORT).show();
				}
			});
		
    }

	
}

<?xml version="1.0" encoding="UTF-8"?>
<TabHost xmlns:android="http://schemas.android.com/apk/res/android"
	android:id="@android:id/tabhost"
	android:layout_width="fill_parent"
	android:layout_height="fill_parent">

	<LinearLayout
		android:layout_width="fill_parent"
		android:layout_height="fill_parent"
		android:orientation="vertical">

		<FrameLayout
			android:id="@android:id/tabcontent"
			android:layout_width="fill_parent"
			android:layout_height="0dip"
			android:layout_weight="1" />

		<TabWidget
			android:id="@android:id/tabs"
			android:layout_width="fill_parent"
			android:layout_height="wrap_content"
			android:layout_marginBottom="-4dp"
			android:layout_weight="0" />

	</LinearLayout>

</TabHost>

package com.mycompany.myapp;

import android.app.*;
import android.os.*;
import android.widget.Spinner;
import android.widget.ArrayAdapter;
import java.util.Locale;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import android.content.res.*;
import android.content.SharedPreferences;
import android.content.Context;
import android.widget.*;
import java.security.SecureRandom;

public class personalActivity extends Activity 
{
    static final String AB = "0123456789abcdefghijklmnopqrstuvwxyz";
	static SecureRandom rnd = new SecureRandom();
	
	private Spinner spinner1,citizenship, spinner3;
	private EditText editText1, editText2, editText3;
	
	@Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.personal);
		
		spinner1 = (Spinner) findViewById(R.id.spinner1);
        String []opciones={getString(R.string.secreto),getString(R.string.masculino),getString(R.string.femenino)};
        ArrayAdapter <String>adapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item, opciones);
        spinner1.setAdapter(adapter);
		
		Locale[] locale = Locale.getAvailableLocales();
		ArrayList<String> countries = new ArrayList<String>();
		String country;
		for( Locale loc : locale ){
			country = loc.getDisplayCountry();
			if( country.length() > 0 && !countries.contains(country) ){
				countries.add( country );
			}
		}
		Collections.sort(countries, String.CASE_INSENSITIVE_ORDER);
		countries.add(0, getString(R.string.secreto));
		citizenship = (Spinner)findViewById(R.id.citizenship);
		ArrayAdapter<String> adapter2 = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item, countries);
		citizenship.setAdapter(adapter2);
		
		List age = new ArrayList<Integer>();
		for (int i = 1; i <= 100; i++) {
			age.add(Integer.toString(i));
		}
		age.add(0, getString(R.string.secreto));
		ArrayAdapter<Integer> spinnerArrayAdapter = new ArrayAdapter<Integer>(
			this, android.R.layout.simple_spinner_item, age);
		spinner3 = (Spinner)findViewById(R.id.age);
		spinner3.setAdapter(spinnerArrayAdapter);
		
		editText1=(EditText)findViewById(R.id.mainEditText2);
		editText2=(EditText)findViewById(R.id.mainEditText3);
		editText3=(EditText)findViewById(R.id.mainEditText4);
		
		SharedPreferences prefe=getSharedPreferences("datos", Context.MODE_PRIVATE);
        if(prefe.getString("usuario","").length()==0)
		{
			editText1.setText("rs "+randomString(5));
		}
		else
		{
			editText1.setText(prefe.getString("usuario",""));
		}
		spinner1.setSelection(prefe.getInt("sexo",-1));
		citizenship.setSelection(prefe.getInt("pais",-1));
		editText2.setText(prefe.getString("estado",""));
		editText3.setText(prefe.getString("personal",""));
		spinner3.setSelection(prefe.getInt("edad",-1));
		
    }

	@Override
	protected void onStop()
	{
		SharedPreferences preferencias=getSharedPreferences("datos",Context.MODE_PRIVATE);
        SharedPreferences.Editor editor=preferencias.edit();
        editor.putString("usuario", editText1.getText().toString());
		editor.putInt("sexo", spinner1.getSelectedItemPosition());
		editor.putInt("pais", citizenship.getSelectedItemPosition());
		editor.putString("estado", editText2.getText().toString());
		editor.putString("personal", editText3.getText().toString());
		editor.putInt("edad", spinner3.getSelectedItemPosition());
        editor.commit();
        finish();
		super.onStop();
	}
	
	String randomString( int len ){
		StringBuilder sb = new StringBuilder( len );
		for( int i = 0; i < len; i++ ) 
			sb.append( AB.charAt( rnd.nextInt(AB.length()) ) );
		return sb.toString();
	}
}

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

	<TextView
		android:layout_width="wrap_content"
		android:layout_height="wrap_content"
		android:text="Hashlink:"
		android:textSize="29sp"
		android:id="@+id/mainTextView1"/>

	<EditText
		android:layout_width="wrap_content"
		android:ems="12"
		android:layout_height="wrap_content"
		android:layout_below="@id/mainTextView1"
		android:id="@+id/mainEditText1"/>

	<TextView
		android:layout_width="wrap_content"
		android:layout_height="wrap_content"
		android:text="@string/usuario"
		android:layout_below="@id/mainEditText1"
		android:layout_marginTop="40dp"
		android:textStyle="bold"
		android:id="@+id/mainTextView2"/>

	<TextView
		android:layout_width="wrap_content"
		android:layout_height="wrap_content"
		android:text="@string/sexo"
		android:layout_below="@id/mainTextView2"
		android:layout_marginTop="40dp"
		android:textStyle="bold"
		android:id="@+id/mainTextView3"/>

	<TextView
		android:layout_width="wrap_content"
		android:layout_height="wrap_content"
		android:text="@string/pais"
		android:layout_below="@id/mainTextView3"
		android:layout_marginTop="40dp"
		android:textStyle="bold"
		android:id="@+id/mainTextView4"/>

	<TextView
		android:layout_width="wrap_content"
		android:layout_height="wrap_content"
		android:text="@string/ciudad"
		android:layout_below="@id/mainTextView4"
		android:layout_marginTop="40dp"
		android:textStyle="bold"
		android:id="@+id/mainTextView5"/>

	<TextView
		android:layout_width="wrap_content"
		android:layout_height="wrap_content"
		android:text="@string/personal"
		android:layout_below="@id/mainTextView5"
		android:layout_marginTop="40dp"
		android:textStyle="bold"
		android:id="@+id/mainTextView6"/>

	<TextView
		android:layout_width="wrap_content"
		android:layout_height="wrap_content"
		android:text="@string/edad"
		android:layout_below="@id/mainTextView6"
		android:layout_marginTop="40dp"
		android:textStyle="bold"
		android:id="@+id/mainTextView7"/>

	<Button
		android:layout_width="wrap_content"
		android:layout_height="wrap_content"
		android:text="@string/conectar"
		android:layout_below="@id/mainTextView7"
		android:layout_marginTop="50dp"
		android:layout_marginLeft="120dp"/>

	<EditText
		android:layout_width="wrap_content"
		android:ems="10"
		android:layout_height="wrap_content"
		android:layout_toRightOf="@id/mainTextView6"
		android:layout_marginTop="110dp"
		android:id="@+id/mainEditText2"/>

	<Spinner
		android:layout_width="wrap_content"
		android:layout_height="wrap_content"
		android:layout_toRightOf="@id/mainTextView6"
		android:layout_marginTop="180dp"
		android:id="@+id/spinner1"/>

	<Spinner
		android:layout_width="wrap_content"
		android:layout_height="wrap_content"
		android:layout_toRightOf="@id/mainTextView6"
		android:layout_marginTop="240dp"
		android:id="@+id/citizenship"/>

	<EditText
		android:layout_width="wrap_content"
		android:ems="10"
		android:layout_height="wrap_content"
		android:layout_toRightOf="@id/mainTextView6"
		android:layout_marginTop="285dp"
		android:id="@+id/mainEditText3"/>

	<EditText
		android:layout_width="wrap_content"
		android:ems="10"
		android:layout_height="wrap_content"
		android:layout_toRightOf="@id/mainTextView6"
		android:layout_marginTop="342dp"
		android:id="@+id/mainEditText4"/>

	<Spinner
		android:layout_width="wrap_content"
		android:layout_height="wrap_content"
		android:layout_toRightOf="@id/mainTextView6"
		android:layout_marginTop="418dp"
		android:id="@+id/age"/>

</RelativeLayout>

package com.mycompany.myapp;

import android.app.*;
import android.os.*;

public class chatActivity extends Activity {
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
        setContentView(R.layout.chat);
	}
}

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

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.mycompany.myapp" >

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name"
			android:configChanges="locale">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
		<activity
			android:name=".personalActivity"
			android:label="@string/title_activity_my"></activity>
		<activity
			android:name=".chatActivity"
			android:label="@string/title_activity_about"></activity>
    </application>

</manifest>