动态LinearLayout +触摸事件始终使用最后添加的LinearLayout
动态LinearLayout +触摸事件始终使用最后添加的LinearLayout
提问于 2015-02-13 03:29:14
我打算在布局中添加一个动态的“按钮”列表。现在，我的按钮由LinearLayout、ImageView和TextView组成。我甚至在每次迭代时都会给LinearLayout添加一个触点。所有对象都已添加并正确显示。但从那时起，一切都出了问题。
触摸事件将为每个按钮触发，但相应的发送者对象是最后添加的LinearLayout。
例如:我有3个“按钮”要添加。每一个都被创建并添加到它们需要的位置。在循环中，我为每个“按钮”向Touch事件添加了一个事件处理程序。当我去触摸第一个时，最后一个会突出显示。我触摸第二个，最后一个突出显示。
我对触摸事件使用了一种通用的方法，并通过我存储的第二个值(如标签)来识别它们。
下面提供的是针对这种情况的相关代码。
基于来自web服务的记录集添加“按钮”的代码。
if (calendars != null && calendars.Rows.Count > 0)
{
LinearLayout buttonCalendar = null;
TextView labelTitle = null;
ImageView imageIcon = null;
Int64 App_CalendarID = 0;
String Title = "";
LinearLayout.LayoutParams layoutParams =
new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MatchParent, Android.DpToPx(45, this.View.Context));
LinearLayout.LayoutParams imageParams =
new LinearLayout.LayoutParams(Android.DpToPx(45, this.View.Context), LinearLayout.LayoutParams.MatchParent);
LinearLayout.LayoutParams labelParams =
new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MatchParent, LinearLayout.LayoutParams.MatchParent);
Drawable icon = null;
icon = Resources.GetDrawable(Resource.Drawable.image_calendar_light);
TransitionDrawable buttonTransition =
(TransitionDrawable)Resources.GetDrawable(Resource.Drawable.button_transition);
foreach (DataRow row in calendars.Rows)
{
App_CalendarID = Convert.ToInt64(row["App_CalendarID"]);
Title = Convert.ToString(row["Title"]);
buttonCalendar = new LinearLayout(layoutFeatureBody.Context)
{
Orientation = Orientation.Horizontal,
LayoutParameters = layoutParams,
Background = buttonTransition,
Id = (Int32)App_CalendarID,
};
imageIcon = new ImageView(layoutFeatureBody.Context)
{
Background = icon,
LayoutParameters = imageParams,
};
imageIcon.SetScaleType(ImageView.ScaleType.CenterInside);
buttonCalendar.AddView(imageIcon);
labelTitle = new TextView(layoutFeatureBody.Context)
{
Text = Title,
TextSize = 14f,
LayoutParameters = labelParams,
Gravity = GravityFlags.CenterVertical,
};
labelTitle.SetTextColor(Color.White);
buttonCalendar.AddView(labelTitle);
layoutFeatureBody.AddView(buttonCalendar);
buttonCalendar.Touch += buttonCalendar_Touch;
}
}下面是为Touch事件分配的方法。
void buttonCalendar_Touch(object sender, View.TouchEventArgs e)
{
LinearLayout buttonLayout = (LinearLayout)sender;
Android.TransitionButton(ref buttonLayout, e.Event);
if (e.Event.Action != MotionEventActions.Up)
return;
}我猜事件不会像在.Net中那样工作:-X我正在努力在网上找到任何与这种情况相关的帮助。
提前谢谢。
回答 1
Stack Overflow用户
发布于 2015-02-13 04:08:29
我不太确定我做了什么(代码没有改变，只是移动了)。但我做了一些早就该做的工作，即把所有相关代码移到LinearLayout的一个子类中来表示我的“按钮”。
真的只是让代码更容易阅读和管理。
现在，事件似乎是独立运行的。这是我的更新代码，也许有人能帮我解释一下我在这里看到的情况。
下面的代码添加了按钮：
if (calendars != null && calendars.Rows.Count > 0)
{
ButtonEx buttonCalendar = null;
Int64 App_CalendarID = 0;
String Title = "";
Drawable icon = null;
icon = Resources.GetDrawable(Resource.Drawable.image_calendar_light);
foreach (DataRow row in calendars.Rows)
{
App_CalendarID = Convert.ToInt64(row["App_CalendarID"]);
Title = Convert.ToString(row["Title"]);
buttonCalendar = new ButtonEx(layoutFeatureBody.Context)
{
Text = Title,
Tag = App_CalendarID,
Image = icon,
TextColor = Color.White,
TextSize = 14,
};
layoutFeatureBody.AddView(buttonCalendar);
buttonCalendar.Touch += buttonCalendar_Touch;
}
}下面是我的按钮类：
public class ButtonEx : LinearLayout
{
ImageView imageView = null;
TextView textView = null;
LinearLayout.LayoutParams imageParams = null;
LinearLayout.LayoutParams labelParams = null;
public new Object Tag
{ get; set; }
private String _Text = "";
public String Text
{
get
{
return _Text;
}
set
{
if (textView != null)
textView.Text = value;
_Text = value;
}
}
private Color _TextColor = Color.White;
public Color TextColor
{
get
{
return _TextColor;
}
set
{
if (textView != null)
textView.SetTextColor(value);
_TextColor = value;
}
}
private float _TextSize = 12f;
public float TextSize
{
get
{
return _TextSize;
}
set
{
if (textView != null)
textView.TextSize = value;
_TextSize = value;
}
}
public Drawable _Image = null;
public Drawable Image
{
get
{
return _Image;
}
set
{
if (imageView != null)
imageView.Background = value;
_Image = value;
}
}
public ButtonEx(Context context)
: base(context)
{
TransitionDrawable buttonTransition =
(TransitionDrawable)Resources.GetDrawable(Resource.Drawable.button_transition);
LinearLayout.LayoutParams layoutParams =
new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MatchParent, Android.DpToPx(45, context));
this.Background = buttonTransition;
this.LayoutParameters = layoutParams;
this.Orientation = Orientation.Horizontal;
imageParams =
new LinearLayout.LayoutParams(
Android.DpToPx(45, context),
LinearLayout.LayoutParams.MatchParent);
labelParams =
new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.MatchParent,
LinearLayout.LayoutParams.MatchParent);
imageView = new ImageView(context)
{
LayoutParameters = imageParams,
};
imageView.SetScaleType(ImageView.ScaleType.CenterInside);
this.AddView(imageView);
textView = new TextView(context)
{
LayoutParameters = labelParams,
Gravity = GravityFlags.CenterVertical,
};
this.AddView(textView);
}
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/28486141
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