我使用水平滚动视图对功能区菜单进行了编码。我的代码如下：
public class HorzScrollWithListMenuActivity extends Activity {
MyHorizontalScrollView scrollView;
View menu;
View app;
ImageView btnSlide;
boolean menuOut = false;
Handler handler = new Handler();
int btnWidth;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
LayoutInflater inflater = LayoutInflater.from(HorzScrollWithListMenuActivity.this);
scrollView = (MyHorizontalScrollView) inflater.inflate(R.layout.horz_scroll_with_list_menu, null);
setContentView(scrollView);
menu = inflater.inflate(R.layout.horz_scroll_menu, null);
app = inflater.inflate(R.layout.horz_scroll_app, null);
ViewGroup tabBar = (ViewGroup) app.findViewById(R.id.tabBar);
ListView listView = (ListView) app.findViewById(R.id.list);
ViewUtils.initListView(this, listView, "Item ", 50, android.R.layout.simple_list_item_1);
listView = (ListView) menu.findViewById(R.id.list);
ViewUtils.initListView(this, listView, "Menu ", 30, android.R.layout.simple_list_item_1);
btnSlide = (ImageView) tabBar.findViewById(R.id.BtnSlide);
btnSlide.setOnClickListener(new ClickListenerForScrolling(scrollView, menu,app));
final View[] children = new View[] { menu, app };
// Scroll to app (view[1]) when layout finished.
int scrollToViewIdx = 1;
scrollView.initViews(children, scrollToViewIdx, new SizeCallbackForMenu(btnSlide));
}
/**
* Helper for examples with a HSV that should be scrolled by a menu View's width.
*/
static class ClickListenerForScrolling implements OnClickListener {
HorizontalScrollView scrollView;
View menu;
View app;
/**
* Menu must NOT be out/shown to start with.
*/
boolean menuOut = false;
public ClickListenerForScrolling(HorizontalScrollView scrollView, View menu, View app) {
super();
this.scrollView = scrollView;
this.menu = menu;
this.app=app;
}
public void onClick(View v) {
Context context = menu.getContext();
String msg = "Slide " + new Date();
Toast.makeText(context, msg, 1000).show();
System.out.println(msg);
int menuWidth = menu.getMeasuredWidth();
// Ensure menu is visible
menu.setVisibility(View.VISIBLE);
if (!menuOut) {
// Scroll to 0 to reveal menu
int left = 0;
scrollView.smoothScrollTo(left, 0);
} else {
// Scroll to menuWidth so menu isn't on screen.
int left = menuWidth;
scrollView.smoothScrollTo(left, 0);
}
menuOut = !menuOut;
if(v.isPressed())
{
v.setClickable(false);
}
}
}
/**
* Helper that remembers the width of the 'slide' button, so that the 'slide' button remains in view, even when the menu is
* showing.
*/
static class SizeCallbackForMenu implements SizeCallback {
int btnWidth;
View btnSlide;
public SizeCallbackForMenu(View btnSlide) {
super();
this.btnSlide = btnSlide;
}
public void onGlobalLayout() {
btnWidth = btnSlide.getMeasuredWidth();
System.out.println("btnWidth=" + btnWidth);
}
public void getViewSize(int idx, int w, int h, int[] dims) {
dims[0] = w;
dims[1] = h;
final int menuIdx = 0;
if (idx == menuIdx) {
dims[0] = w - btnWidth;
}
}
}
}
MyHorizontalScrollView.java
public class MyHorizontalScrollView extends HorizontalScrollView {
public MyHorizontalScrollView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init(context);
}
public MyHorizontalScrollView(Context context, AttributeSet attrs) {
super(context, attrs);
init(context);
}
public MyHorizontalScrollView(Context context) {
super(context);
init(context);
}
void init(Context context) {
// remove the fading as the HSV looks better without it
setHorizontalFadingEdgeEnabled(false);
setVerticalFadingEdgeEnabled(false);
}
/**
* @param children
* The child Views to add to parent.
* @param scrollToViewIdx
* The index of the View to scroll to after initialisation.
* @param sizeCallback
* A SizeCallback to interact with the HSV.
*/
public void initViews(View[] children, int scrollToViewIdx, SizeCallback sizeCallback) {
// A ViewGroup MUST be the only child of the HSV
ViewGroup parent = (ViewGroup) getChildAt(0);
// Add all the children, but add them invisible so that the layouts are calculated, but you can't see the Views
for (int i = 0; i < children.length; i++) {
children[i].setVisibility(View.INVISIBLE);
parent.addView(children[i]);
}
// Add a layout listener to this HSV
// This listener is responsible for arranging the child views.
OnGlobalLayoutListener listener = new MyOnGlobalLayoutListener(parent, children, scrollToViewIdx, sizeCallback);
getViewTreeObserver().addOnGlobalLayoutListener(listener);
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
// Do not allow touch events.
return false;
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
// Do not allow touch events.
return false;
}
/**
* An OnGlobalLayoutListener impl that passes on the call to onGlobalLayout to a SizeCallback, before removing all the Views
* in the HSV and adding them again with calculated widths and heights.
*/
class MyOnGlobalLayoutListener implements OnGlobalLayoutListener {
ViewGroup parent;
View[] children;
int scrollToViewIdx;
int scrollToViewPos = 0;
SizeCallback sizeCallback;
/**
* @param parent
* The parent to which the child Views should be added.
* @param children
* The child Views to add to parent.
* @param scrollToViewIdx
* The index of the View to scroll to after initialisation.
* @param sizeCallback
* A SizeCallback to interact with the HSV.
*/
public MyOnGlobalLayoutListener(ViewGroup parent, View[] children, int scrollToViewIdx, SizeCallback sizeCallback) {
this.parent = parent;
this.children = children;
this.scrollToViewIdx = scrollToViewIdx;
this.sizeCallback = sizeCallback;
}
public void onGlobalLayout() {
// System.out.println("onGlobalLayout");
final HorizontalScrollView me = MyHorizontalScrollView.this;
// The listener will remove itself as a layout listener to the HSV
me.getViewTreeObserver().removeGlobalOnLayoutListener(this);
// Allow the SizeCallback to 'see' the Views before we remove them and re-add them.
// This lets the SizeCallback prepare View sizes, ahead of calls to SizeCallback.getViewSize().
sizeCallback.onGlobalLayout();
parent.removeViewsInLayout(0, children.length);
final int w = me.getMeasuredWidth();
final int h = me.getMeasuredHeight();
// System.out.println("w=" + w + ", h=" + h);
// Add each view in turn, and apply the width and height returned by the SizeCallback.
int[] dims = new int[2];
scrollToViewPos = 0;
for (int i = 0; i < children.length; i++) {
sizeCallback.getViewSize(i, w, h, dims);
// System.out.println("addView w=" + dims[0] + ", h=" + dims[1]);
children[i].setVisibility(View.VISIBLE);
parent.addView(children[i], dims[0], dims[1]);
if (i < scrollToViewIdx) {
scrollToViewPos += dims[0];
}
}
// For some reason we need to post this action, rather than call immediately.
// If we try immediately, it will not scroll.
new Handler().post(new Runnable() {
public void run() {
me.scrollBy(scrollToViewPos, 0);
}
});
}
}
/**
* Callback interface to interact with the HSV.
*/
public interface SizeCallback {
/**
* Used to allow clients to measure Views before re-adding them.
*/
public void onGlobalLayout();
/**
* Used by clients to specify the View dimensions.
*
* @param idx
* Index of the View.
* @param w
* Width of the parent View.
* @param h
* Height of the parent View.
* @param dims
* dims[0] should be set to View width. dims[1] should be set to View height.
*/
public void getViewSize(int idx, int w, int h, int[] dims);
}
}
ViewUtils.java
public class ViewUtils {
private ViewUtils() {
}
public static void initListView(Context context, ListView listView, String prefix, int numItems, int layout) {
// By using setAdpater method in listview we an add string array in list.
String[] arr = new String[numItems];
for (int i = 0; i < arr.length; i++) {
arr[i] = prefix + (i + 1);
}
listView.setAdapter(new ArrayAdapter<String>(context, layout, arr));
listView.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Context context = view.getContext();
String msg = "item[" + position + "]=" + parent.getItemAtPosition(position);
Toast.makeText(context, msg, 1000).show();
System.out.println(msg);
}
});
}
}
请告诉我如何提供滑动选项。
如何使用片段做相同的项目（功能区菜单）？
