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copied!<p>I would use custom ButtonField and PopupScreen. Two reasons: </p> <ul> <li>in mobile design it's better to use screen effectively, and classic desktop dropdown control seems to be less sufficient than popup, at least for complex items (image + text)</li> <li>it's easier :)</li> </ul> <p><a href="http://img405.imageshack.us/img405/3746/dropdown.jpg" rel="nofollow noreferrer">alt text http://img405.imageshack.us/img405/3746/dropdown.jpg</a> </p> <p>DropDownItem: </p> <pre><code>class DropdownItem { Bitmap mBitmap; String mName; public DropdownItem(Bitmap bitmap, String name) { this.mBitmap = bitmap; this.mName = name; } } </code></pre> <p>Custom ButtonField: </p> <pre><code>class BitmapButtonField extends ButtonField { protected DropdownItem mItem; boolean mTextItem; int mWidth; int mHeight; public BitmapButtonField(DropdownItem item, boolean textItem) { super(CONSUME_CLICK); mItem = item; mTextItem = textItem; mWidth = mItem.mBitmap.getWidth() + 6 + (mTextItem ? getFont().getAdvance(mItem.mName) + 6 : 0); mHeight = mItem.mBitmap.getHeight() + 6; setMargin(0, 0, 0, 0); setPadding(0, 0, 0, 0); setBorder(BorderFactory.createSimpleBorder(new XYEdges(0, 0, 0, 0))); setBorder(VISUAL_STATE_ACTIVE, BorderFactory .createSimpleBorder(new XYEdges(0, 0, 0, 0))); } protected void paint(Graphics graphics) { int color = (getVisualState() == VISUAL_STATE_FOCUS) ? Color.LIGHTGREY : Color.DARKGRAY; graphics.setColor(color); graphics.drawRect(1, 1, mWidth - 2, mHeight - 2); graphics.drawBitmap(3, 3, mItem.mBitmap.getWidth(), mItem.mBitmap .getHeight(), mItem.mBitmap, 0, 0); if (mTextItem) graphics.drawText(mItem.mName, mItem.mBitmap.getWidth() + 6, 3); } public int getPreferredWidth() { return mWidth; } public int getPreferredHeight() { return mHeight; } protected void layout(int width, int height) { setExtent(mWidth, mHeight); } } </code></pre> <p>Dropdown control itself: </p> <pre><code>class DDImagesButton extends BitmapButtonField implements FieldChangeListener { DropdownItem[] mItems; int mIndex; public DDImagesButton(DropdownItem[] items) { super(items[0], false); mItems = items; updateIndex(0); setChangeListener(this); } protected void paint(Graphics graphics) { super.paint(graphics); int x = mItems[mIndex].mBitmap.getWidth() + 2; int y = 5; int y1 = y; int y2 = y + 10; int x1 = x; int x2 = x + 18; int[] xPts = new int[] { x1, x2, x1 + 9 }; int[] yPts = new int[] { y1, y1, y2 }; graphics.drawFilledPath(xPts, yPts, null, null); } public void fieldChanged(Field field, int context) { getScreen().getUiEngine().pushScreen(new DDImagesPopUp()); } public void updateIndex(int index) { mIndex = index; mItem = mItems[mIndex]; mWidth = mItem.mBitmap.getWidth() + 6 + 18 + 3; mHeight = mItem.mBitmap.getHeight() + 6; invalidate(); } class DDImagesPopUp extends PopupScreen implements FieldChangeListener { public DDImagesPopUp() { super( new VerticalFieldManager(VERTICAL_SCROLL | VERTICAL_SCROLLBAR)); for (int i = 0; i < mItems.length; i++) { BitmapButtonField button = new BitmapButtonField(mItems[i], true); add(button); button.setChangeListener(this); } setFieldWithFocus(getField(mIndex)); } protected boolean keyChar(char key, int status, int time) { if (Keypad.KEY_ESCAPE == key) { this.close(); return true; } else return super.keyChar(key, status, time); } public void fieldChanged(Field field, int context) { updateIndex(getFieldWithFocusIndex()); close(); } } } </code></pre> <p>Sample of use: </p> <pre><code>class Scr extends MainScreen { DDImagesButton ddImages1; DDImagesButton ddImages2; public Scr() { HorizontalFieldManager hfm = new HorizontalFieldManager(); add(hfm); DropdownItem[] items = new DropdownItem[6]; items[0] = new DropdownItem(Bitmap.getBitmapResource("1.png"), "Add Item"); items[1] = new DropdownItem(Bitmap.getBitmapResource("2.png"), "Attachment"); items[2] = new DropdownItem(Bitmap.getBitmapResource("3.png"), "Time"); items[3] = new DropdownItem(Bitmap.getBitmapResource("4.png"), "User"); items[4] = new DropdownItem(Bitmap.getBitmapResource("5.png"), "Group"); items[5] = new DropdownItem(Bitmap.getBitmapResource("6.png"), "Information"); ddImages1 = new DDImagesButton(items); hfm.add(ddImages1); ddImages2 = new DDImagesButton(items); hfm.add(ddImages2); } } </code></pre>

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