我有一个全屏自定义图库。画廊的元素有按钮和其他互动区域。一些用户界面是通过在画廊前弹出的对话框完成的;当一个对话框被解除时，用户将被带回画廊。
大部分时间，这都很好。但是，有时，在关闭对话框后，按钮会停止用户输入。另一方面，画廊仍然滚动。更奇怪的是，只要我滚动图库，系统就会处理我认为失败的点击（弹出对话框等）。
很容易说主UI线程已被锁定。为什么锁定？我该如何解锁？任何帮助将不胜感激。以下是该课程的完整代码。
更新。图库中的一个元素是HorizontalScrollView。当我尝试滚动它时，鼠标消息通过;我走过它们，看到scrollBy()和invalidate()被正确调用了。然后我打印出消息队列。通过主循环的唯一事件是1006，我假设是Touch事件。 Draw事件，1000，永远不会成功。一旦我来回滚动图库 - 瞧瞧 - 消息队列开始接收1000，所以HorizontalScrollView滚动得很好！
所以问题就变成了：什么停止Draw事件，以及如何确保它们被发送到队列？
public class PlayerGallery extends Gallery
{
// 4 buttons to display
private final static int BUT_BIRD = 0;
private final static int BUT_SCORE = 1;
private final static int BUT_ROUND = 2;
private final static int BUT_MOVE = 3;
private final static int N_BUTTONS = 4;
// button images
private final static Drawable[] imgButtons =
{
WonDraw.WW.bird,
WonDraw.WW.scores,
WonDraw.WW.moveSumm,
WonDraw.WW.lastMove,
};
// individual player views
private PlayerView[] views;
// card that was clicked in the current player view
private Card clickedCard = null;
// wonder that was clicked in the current player view
private Player clickedWonderPlayer = null;
// one player
private final class PlayerView extends RelativeLayout
implements OnClickListener
{
// base view ID for the buttons
private final static int BUT_VIEW_ID = 200;
// player to display
final Player player;
// drawing data
private PlayerDisplay pd = null;
// the sub-view on top that shows player's hand
private HandView handView = null;
// button that takes user into bird's view
private final GlassButton[] buttons = new GlassButton[N_BUTTONS];
public PlayerView(Player player)
{
super(WonActivity.W.getApplicationContext());
setBackgroundColor(Color.TRANSPARENT);
this.player = player;
RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams(
LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT);
lp.addRule(ALIGN_PARENT_TOP);
handView = new HandView();
addView(handView, lp);
for (int i = 0; i < buttons.length; ++i)
{
lp = new RelativeLayout.LayoutParams(
LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
if (i % 2 == 0)
lp.addRule(ALIGN_PARENT_RIGHT);
else
lp.addRule(LEFT_OF, buttons[i - 1].getId());
lp.addRule(BELOW, i / 2 == 0 ? handView.getId() : buttons[i - 2].getId());
GlassButton but = new ImgGlassButton(GlassButton.ROUND, imgButtons[i]);
but.setId(BUT_VIEW_ID + i);
but.setOnClickListener(this);
buttons[i] = but; addView(but, lp);
}
}
// reset for the next player
void reset(boolean useBigCards)
{
pd = WonActivity.W.getDisplay(player.id, useBigCards);
if (useBigCards)
{
handView.pd = pd;
handView.hand = WonActivity.W.getCurrentHand();
handView.setVisibility(VISIBLE);
handView.requestLayout();
handView.scrollTo(0, 0);
}
else
{
handView.pd = null;
handView.hand = null;
handView.setVisibility(GONE);
}
for (int i = BUT_ROUND; i <= BUT_MOVE; ++i)
buttons[i].setEnabled(Table.T.movesAvailable());
invalidate();
}
@Override
protected void dispatchSetPressed(boolean pressed)
{
// if I don't do that, bird button gets pressed when I scroll the gallery!
}
@Override
public boolean onTouchEvent(MotionEvent event)
{
if (event.getAction() == MotionEvent.ACTION_DOWN)
{
int x = (int)event.getX();
int y = (int)event.getY();
clickedCard = pd.findSmallCard(x, y);
clickedWonderPlayer = clickedCard == null && pd.isInWonder(x, y) ?
player : null;
}
return super.onTouchEvent(event);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
{
super.onMeasure(MeasureSpec.makeMeasureSpec(WonActivity.W.getWidth() - 2, MeasureSpec.EXACTLY),
MeasureSpec.makeMeasureSpec(WonActivity.W.getHeight(), MeasureSpec.EXACTLY));
setBackgroundColor(Color.TRANSPARENT);
setBackgroundDrawable(WonDraw.W.getWood());
}
@Override
protected void onDraw(Canvas canvas)
{
super.onDraw(canvas);
if (pd == null) return;
canvas.save();
pd.draw(canvas, handView.hand, true);
canvas.restore();
}
public void onClick(View v)
{
switch (v.getId() - BUT_VIEW_ID)
{
case BUT_BIRD:
WonActivity.W.switchToBird(player.id);
break;
case BUT_SCORE:
WonActivity.W.showScoreDlg();
break;
case BUT_ROUND:
WonActivity.W.showRoundDlg();
break;
case BUT_MOVE:
break;
}
}
};
// custom adapter for the gallery: provides circular functionality
private class PGAdapter extends BaseAdapter
{
public int getCount()
{
return Integer.MAX_VALUE;
}
public Object getItem(int position)
{
return position;
}
public long getItemId(int position)
{
return position;
}
public View getView(int position, View convertView, ViewGroup parent)
{
return views[position % views.length];
}
};
public PlayerGallery()
{
super(WonActivity.W.getApplicationContext());
setSpacing(0);
setBackgroundColor(Color.TRANSPARENT);
views = new PlayerView[Table.T.getPlayerCount()];
for (int i = 0; i < Table.T.getPlayerCount(); ++i)
views[i] = new PlayerView(Table.T.getPlayer(i));
setAdapter(new PGAdapter());
setHorizontalFadingEdgeEnabled(false);
setVerticalFadingEdgeEnabled(false);
}
// reset for the next player
void changeMovingPlayer()
{
for (int i = 0; i < views.length; ++i)
views[i].reset(i == WonActivity.W.getCurrentPlayerID());
setViewedPlayer(Math.max(WonActivity.W.getCurrentPlayerID(), 0));
}
// set the player whose buildings to view
void setViewedPlayer(int index)
{
int pos = Integer.MAX_VALUE / 2;
pos -= pos % views.length;
setSelection(pos + index);
views[index].requestFocus();
views[index].invalidate();
}
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY)
{
int kEvent = e2.getX() > e1.getX() ?
KeyEvent.KEYCODE_DPAD_LEFT :
KeyEvent.KEYCODE_DPAD_RIGHT;
onKeyDown(kEvent, null);
return true;
}
@Override
public boolean onTouchEvent(MotionEvent event)
{
boolean b = super.onTouchEvent(event);
switch (event.getAction())
{
case MotionEvent.ACTION_DOWN:
return true;
case MotionEvent.ACTION_UP:
if (event.getEventTime() - event.getDownTime() < WonActivity.CLICK_MS)
{
if (clickedCard != null)
WonActivity.W.showCardDlg(clickedCard);
else if (clickedWonderPlayer != null)
WonActivity.W.showWonderDlg(clickedWonderPlayer);
}
clickedCard = null;
clickedWonderPlayer = null;
break;
}
return b;
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
{
int w = MeasureSpec.getSize(widthMeasureSpec);
int h = MeasureSpec.getSize(heightMeasureSpec);
WonActivity.W.resize(w, h);
super.onMeasure(MeasureSpec.makeMeasureSpec(w, MeasureSpec.EXACTLY),
MeasureSpec.makeMeasureSpec(h, MeasureSpec.EXACTLY));
}
}