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copied!<p>Try my hack, seems to work at least on 2.2 and above.</p> <pre><code>import java.lang.reflect.Field; import android.annotation.SuppressLint; import android.content.Context; import android.graphics.Rect; import android.graphics.drawable.Drawable; import android.graphics.drawable.LayerDrawable; import android.util.AttributeSet; import android.util.Log; import android.view.View; import android.widget.ListView; /** * This class fixes the lack of setVerticalScrollbarPosition(View.SCROLLBAR_POSITION_LEFT) before API level 11 * @author Genadz Batsyan */ public class ListViewWithLeftScrollBar extends ListView { private static final String LOG_TAG = ListViewWithLeftScrollBar.class.getSimpleName(); private static final boolean DEBUG = true; private boolean patchInvalidate; public ListViewWithLeftScrollBar(Context context) { super(context); moveVerticalScrollbarToTheLeft(); } public ListViewWithLeftScrollBar(Context context, AttributeSet attrs) { super(context, attrs); moveVerticalScrollbarToTheLeft(); } public ListViewWithLeftScrollBar(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); moveVerticalScrollbarToTheLeft(); } @Override public void invalidate(Rect r) { invalidate(r.left, r.top, r.right, r.bottom); } @Override public void invalidate(int left, int top, int right, int bottom) { int width = right - left; if (DEBUG) log("invalidate original w:"+ getWidth() +" h:"+ getHeight()+" rect:"+left+", "+top+", "+right+", "+bottom); if (patchInvalidate && right == getWidth() && top == 0 && bottom == getHeight() && width < 30) { // The above condition should ensure that ListView is VERY likely to be invalidating the scrollbar. // In fact ListView appears to not invalidate anything except the scrollbar, ever. left = 0; right = left + width; if (DEBUG) log("invalidate patched w:"+ getWidth() +" h:"+ getHeight()+" rect:"+left+", "+top+", "+right+", "+bottom); } super.invalidate(left, top, right, bottom); } private void moveVerticalScrollbarToTheLeft() { try { if (DEBUG) log("moveVerticalScrollbarToTheLeft: Trying API Level >=11"); tryApiLevel11(); if (DEBUG) log("moveVerticalScrollbarToTheLeft: API Level >=11 success"); } catch (Throwable t1) { if (DEBUG) { log("moveVerticalScrollbarToTheLeft: API Level >=11 FAILED"); t1.printStackTrace(); } try { if (DEBUG) log("moveVerticalScrollbarToTheLeft: Trying hack for API Level <11"); tryApiLevelPre11(); patchInvalidate = true; if (DEBUG) log("moveVerticalScrollbarToTheLeft: API Level <11 hack success"); } catch (Throwable t2) { if (DEBUG) { log("moveVerticalScrollbarToTheLeft: API Level <11 hack FAILED"); t2.printStackTrace(); } } } } @SuppressLint("NewApi") private void tryApiLevel11() { setVerticalScrollbarPosition(View.SCROLLBAR_POSITION_LEFT); } private void tryApiLevelPre11() throws Exception { Class<?> viewClass = View.class; Field scrollCacheField = viewClass.getDeclaredField("mScrollCache"); scrollCacheField.setAccessible(true); Object scrollCache = scrollCacheField.get(this); if (DEBUG) log("scrollCache: "+ scrollCache); Field scrollBarField = scrollCache.getClass().getDeclaredField("scrollBar"); scrollBarField.setAccessible(true); Object scrollBar = scrollBarField.get(scrollCache); if (DEBUG) log("scrollBar: "+ scrollBar); Field verticalThumbField = scrollBar.getClass().getDeclaredField("mVerticalThumb"); verticalThumbField.setAccessible(true); Object verticalThumb = verticalThumbField.get(scrollBar); if (DEBUG) log("verticalThumb: "+ verticalThumb); Drawable verticalThumbDrawable = (Drawable) verticalThumb; Drawable replacementVerticalThumbDrawable = new LayerDrawable(new Drawable[]{ verticalThumbDrawable }) { @Override public void setBounds(int left, int top, int right, int bottom) { if (DEBUG) log("setBounds original: "+left+", "+top+", "+right+", "+bottom); int width = right - left; left = 0; right = left + width; if (DEBUG) log("setBounds patched: "+left+", "+top+", "+right+", "+bottom); super.setBounds(left, top, right, bottom); } }; verticalThumbField.set(scrollBar, replacementVerticalThumbDrawable); } private static void log(String msg) { Log.d(LOG_TAG, msg); } } </code></pre>

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