EditText and TabHost do not like each other...

Question

I have a layout with EditText and TabHost containing 2 tabs. Android 1.6.

I use hardware keyboard in following case. Steps to reproduce:

1. When activity is displayed the EditText gains focus.

2. As soon as I press any key the EditText loses focus and first tab gains it.

3. I click on the EditText again and start typing.

4. It works unless I press any numeric button. The first tab gains the focus again.

5. I scroll back to the EditText with track ball. I can type anything now.

Using track ball left/right on focused EditText in steps 2,3 also makes the EditText lose its focus.

This is very weird. How to handle with this?

main.xml layout:

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

    <EditText android:id="@+id/textfield" android:layout_width="fill_parent"
        android:layout_height="wrap_content" android:maxLines="1"
        android:lines="1" android:hint="Search" />

    <TabHost android:id="@android:id/tabhost" android:layout_width="fill_parent"
        android:layout_height="wrap_content" android:layout_weight="1">

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


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

                <LinearLayout android:id="@+id/tab1"
                    android:layout_width="fill_parent" android:layout_height="wrap_content" />

                <LinearLayout android:id="@+id/tab2"
                    android:layout_width="fill_parent" android:layout_height="wrap_content" />

            </FrameLayout>

            <TabWidget android:id="@android:id/tabs"
                android:orientation="vertical" android:layout_width="fill_parent"
                android:layout_height="wrap_content" android:gravity="bottom" />

        </LinearLayout>

    </TabHost>

</LinearLayout>

Activity class:

  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    TabHost tabs = (TabHost) this.findViewById(android.R.id.tabhost);
    tabs.setup();

    Button vBtn;

    TabSpec tspec1 = tabs.newTabSpec("label one");
    vBtn = new Button(this);
    vBtn.setText("1");
    tspec1.setIndicator(vBtn);
    tspec1.setContent(R.id.tab1);

    TabSpec tspec2 = tabs.newTabSpec("label two");
    vBtn = new Button(this);
    vBtn.setText("2");
    tspec2.setIndicator(vBtn);
    tspec2.setContent(R.id.tab1);

    tabs.addTab(tspec1);
    tabs.addTab(tspec2);
  }