What are the options for forcing a scrollbar in an Android webview?

Question 1

As of now the best way is to use android:fadeScrollbars="false" in xml which is equivalent to ScrollView.setScrollbarFadingEnabled(false); in java code.

or

Setting the android:scrollbarFadeDuration="0" will do the trick.

Eg: in your onCreate() method : try this :

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.your_web_view_layout); 

    browser = (WebView)findViewById(R.id.your_webview);
    WebSettings mWebSettings = browser.getSettings();
    mWebSettings.setBuiltInZoomControls(true);
    browser.setScrollBarStyle(WebView.SCROLLBARS_OUTSIDE_OVERLAY);
    browser.setScrollbarFadingEnabled(false);
    browser.loadUrl("file:///android_asset/index.html");
}

OR

Try using WebView inside a ScrollView and use android:fadeScrollbars="false" for the ScrollView

Eg:

<ScrollView android:layout_width="fill_parent" 
            android:layout_height="86px" 
            android:id="@+id/scrollTxtDescription"
            android:fadeScrollbars="false"
            android:layout_below="@id/txtLieuPromo1" 
            android:layout_alignLeft="@id/txtLieuPromo1">

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

                <WebView android:id="@+id/txtDescription" 
                    android:layout_width="fill_parent"
                    android:layout_height="wrap_content"
                    />
            </LinearLayout>
        </ScrollView>

Question 2

In your code you can try this:

webView.setScrollbarFadingEnabled(false);

This will disable the scrollbars from fading away.

Question 3

Just Add these lines in your activity to the webview, and no need to add anything in xml,this will lead both horizontal and vertical scroll.

     webview.getSettings().setLoadWithOverviewMode(true);

                    webview.getSettings().setJavaScriptEnabled(true);

                    webview.loadData("Your Content to show in the webview,
                            "text/html; charset=UTF-8", null);

try with this code, hope you will get the solution.