[android help] android web view not getting displayed as part of screen

my activity code

public class MainActivity extends Activity {
Spinner spinnerProduct;
WebView webView1, webView2, webView3;
private Handler mHandler = new Handler();

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    spinnerProduct = (Spinner) findViewById(R.id.spinner_select_product);

    List list = new ArrayList();
    list.add("Product 1");
    list.add("Product 2");
    list.add("Product 3");

    ArrayAdapter dataAdapter = new ArrayAdapter(this, android.R.layout.simple_spinner_item, list);
    spinnerProduct.setAdapter(dataAdapter);

    dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

    spinnerProduct.setOnItemSelectedListener(new OnItemSelectedListener() {
        @Override
        public void onItemSelected(AdapterView arg0, View arg1, int arg2, long arg3) {
            Toast.makeText(getApplicationContext(), "Product " + ++arg2 + " selected", Toast.LENGTH_LONG).show();
            showHtml();
        }

        @Override
        public void onNothingSelected(AdapterView arg0) {
        }
    });
}

public void showHtml() {
    Log.v("in showHtml", "in showHtml");
    webView1 = (WebView) findViewById(R.id.web_view1);
    WebSettings webSettings = webView1.getSettings();
    webSettings.setJavaScriptEnabled(true);

    webSettings.setSavePassword(true);
    webSettings.setSaveFormData(true);
    webSettings.setSupportZoom(true);

    // webView1.addJavascriptInterface(new DemoJavaScriptInterface(),
    // "demo");

    webView1.loadUrl("file:///android_asset/product.html");

    webView1.setWebChromeClient(new MyJavaScriptChromeClient(getApplicationContext()));
}}

My xml code

xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:weightSum="10"
tools:context=".MainActivity" >

    android:id="@+id/ll_header"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_weight="1" >

            android:id="@+id/tv_header"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:text="@string/app_name" />


    android:id="@+id/ll_select_product"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_weight="2"
    android:gravity="center"
    android:orientation="vertical" >

            android:id="@+id/spinner_select_product"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center" />


    android:id="@+id/ll_web_views"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_weight="7"
    android:orientation="horizontal"
    android:weightSum="3" >

            android:id="@+id/web_view1"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_weight="1" />

            android:id="@+id/web_view2"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_weight="1" />

            android:id="@+id/web_view3"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_weight="1" />

I checked logcat, showHtml() method gets called(it prints "in html").

But web view doesn't get displayed.

.

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