如何在android中降低Drop Down的高度？

问题描述

我在我的应用程序中使用默认的android微调器。如何减少默认方法不起作用时下拉菜单的高度？

解决方法

通过反射，您可以设置下拉菜单的高度

Spinner spinner = (Spinner) findViewById(R.id.spinner);
    try {
        Field popup = Spinner.class.getDeclaredField("mPopup");
        popup.setAccessible(true);

        // Get private mPopup member variable and try cast to ListPopupWindow
        android.widget.ListPopupWindow popupWindow = (android.widget.ListPopupWindow) popup.get(spinner);

        // Set popupWindow height to 500px
        popupWindow.setHeight(500);
    }
    catch (NoClassDefFoundError | ClassCastException | NoSuchFieldException | IllegalAccessException e) {
        // silently fail...
    }

如果上述方法不起作用，则Create类扩展Spinner类将覆盖getWindowVisibleDisplayFrame(Rect outRect)用于计算的android.widget.PopupWindow。只需将outRect设置为可显示下拉视图的区域即可。

@Override
public void getWindowVisibleDisplayFrame(Rect outRect) {
    WindowManager wm = (WindowManager) getContext.getSystemService(Context.WINDOW_SERVICE);
    Display d = wm.getDefaultDisplay();
    d.getRectSize(outRect);
    outRect.set(outRect.left,<STATUS BAR HEIGHT>,outRect.right,outRect.bottom);
}

,

选中此answer

 Spinner spinner = (Spinner) findViewById(R.id.spinner);
try {
    Field popup = Spinner.class.getDeclaredField("mPopup");
    popup.setAccessible(true);

    // Get private mPopup member variable and try cast to ListPopupWindow
    android.widget.ListPopupWindow popupWindow = (android.widget.ListPopupWindow) popup.get(spinner);

    // Set popupWindow height to 500px
    popupWindow.setHeight(500);
}
catch (NoClassDefFoundError | ClassCastException | NoSuchFieldException | IllegalAccessException e) {
    // silently fail...
}