Android Question Click image
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You can place a transparent panel above the imageview and handle the touchevents on the panel to find out the position.
You can place a transparent panel above the imageview and handle the touchevents on the panel to find out the position.
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In principle it is true what says @DonManfred, it is better to use a panel and set the BackgroundImage at the bottom of the panel.
However if you want to know the click point of the image you can do so.
If you want to know only the first point touched remove the for and use this:
However if you want to know the click point of the image you can do so.
B4X:
Sub Globals
'These global variables will be redeclared each time the activity is created.
'These variables can only be accessed from this module.
Private ImageView1 As ImageView
End Sub
Sub Activity_Create(FirstTime As Boolean)
'Do not forget to load the layout file created with the visual designer. For example:
Activity.LoadLayout("Layout1")
Dim obj As Reflector
obj.Target = ImageView1
obj.SetOnTouchListener("ImageView1_Touch")
End Sub
Sub Activity_Resume
End Sub
Sub Activity_Pause (UserClosed As Boolean)
End Sub
Sub ImageView1_Touch(viewtag As Object, action As Int, X As Float, Y As Float, motionevent As Object) As Boolean
'Multi Touch
Dim jo As JavaObject = motionevent
Dim pc As Int = jo.RunMethod("getPointerCount", Null)
For p=0 To pc-1
Log(jo.RunMethod("getX", Array As Object(p)))
Log(jo.RunMethod("getY", Array As Object(p)))
Next
Return True
End SubIf you want to know only the first point touched remove the for and use this:
B4X:
Log(jo.RunMethod("getX", Array As Object(0)))
Log(jo.RunMethod("getY", Array As Object(0)))
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The Position you get is a position inside the imageview. If it is not completely visible on the screen then you can not click on it on the parts outside of the screen.
Though it makes no sense to show an imageview in a size bigger than the screen.
Though it makes no sense to show an imageview in a size bigger than the screen.
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Have you an example with GetColor() please
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Now I'm out of the office and I can not give you an example.
But using the XUI library is by taking a snapshot of the panel/imageview you can get the bitmap and the point.
The same using the canvas.
But the best solution is have a bitmap with the same image that you inserted into panel/imageview, and with the bitmap variable then have the color of whatever on the x and y coordinates.
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Okay, because I have a picture with a body. On this picture you have 4 differents colors, each color is a muscle and I want to load different layout when I click on a muscle.
So you say with a bitmap I can do something like that ?
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this is on method
But if you already have the image saved in a bitmap, do so before
B4X:
Sub ImageView1_Touch(viewtag As Object, action As Int, X As Float, Y As Float, motionevent As Object) As Boolean
Dim IV As ImageView = Sender
Dim Can As Canvas
Dim jo As JavaObject = motionevent
Dim X1 As Int = jo.RunMethod("getX", Array As Object(0))
Dim Y1 As Int = jo.RunMethod("getY", Array As Object(0))
Can.Initialize(IV)
Dim Color As Int = Can.Bitmap.GetPixel(X1,Y1)
Log("This colo is touched:" & Color)
Return True
End SubBut if you already have the image saved in a bitmap, do so before
B4X:
Sub ImageView1_Touch(viewtag As Object, action As Int, X As Float, Y As Float, motionevent As Object) As Boolean
Dim IV As ImageView = Sender
Dim Can As Canvas
Dim jo As JavaObject = motionevent
Dim X1 As Int = jo.RunMethod("getX", Array As Object(0))
Dim Y1 As Int = jo.RunMethod("getY", Array As Object(0))
Dim color As Int = BitmapImage.GetPixel(X1*(BitmapImage.Width/IV.Width),Y1*(BitmapImage.Height/IV.Height))
Return True
End Sub
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With the 1st method sometime my app crash :/
And the second work but the value in color is special: ex: red => -43174
Can you explain why ?
edit: the second give me this message :
java.lang.IllegalArgumentException: y must be < bitmap.height()
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Just can you answer me about 1 thing: My picture is 320x320 but when I get the position x & y the value in the right bottom corner is superior than 320 why ??make u debug and see the x and y positions if they are correct and internal to the view.
You have to do the rest
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B4X:
Sub img_body_Touch(viewtag As Object, action As Int, X As Float, Y As Float, motionevent As Object) As Boolean
Dim IV As ImageView = Sender
Dim Can As Canvas
Dim jo As JavaObject = motionevent
Dim X1 As Int = jo.RunMethod("getX", Array As Object(0))
Dim Y1 As Int = jo.RunMethod("getY", Array As Object(0))
X1 = X1 * (bitmap1.Width/(IV.Width))
Y1 = Y1 * (bitmap1.Height/(IV.Height))
'Log("test: " & IV.Width & " : " & IV.Height)
Log("X1= " & X1 & " Y1= " & Y1)
' 'Can.Initialize(IV)
If Y1 <= bitmap1.Height Then
Dim Color As Int = bitmap1.GetPixel(X1*(bitmap1.Width/IV.Width),Y1*(bitmap1.Height/IV.Height))
Log("color: " & Color)
If Color = -43174 Then
ToastMessageShow("ROUGE",False)
Else if Color = -9699497 Then
ToastMessageShow("VERT",False)
Else if Color = -11021569 Then
ToastMessageShow("BLEU",False)
Else if Color = -149161 Then
ToastMessageShow("JAUNE",False)
End If
End If
Return True
End Sub
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Double the proportion with the view, just once.
Use the Colors class to identify colors instead of numbers.
If they are particular colors you can use Colors.ARGB and Colors.RGB
Use the Colors class to identify colors instead of numbers.
If they are particular colors you can use Colors.ARGB and Colors.RGB
B4X:
Sub img_body_Touch(viewtag As Object, action As Int, X As Float, Y As Float, motionevent As Object) As Boolean
Dim IV As ImageView = Sender
Dim Can As Canvas
Dim jo As JavaObject = motionevent
Dim X1 As Int = jo.RunMethod("getX", Array As Object(0))
Dim Y1 As Int = jo.RunMethod("getY", Array As Object(0))
' X1 = X1 * (bitmap1.Width/(IV.Width))
' Y1 = Y1 * (bitmap1.Height/(IV.Height))
'Log("test: " & IV.Width & " : " & IV.Height)
Log("X1= " & X1 & " Y1= " & Y1)
' 'Can.Initialize(IV)
If Y1 <= bitmap1.Height Then
Dim Color As Int = bitmap1.GetPixel(X1*(bitmap1.Width/IV.Width),Y1*(bitmap1.Height/IV.Height))
Log("color: " & Color)
If Color = colors.red Then
ToastMessageShow("ROUGE",False)
Else if Color = colors.greenThen
ToastMessageShow("VERT",False)
Else if Color = -colors.blueThen
ToastMessageShow("BLEU",False)
Else if Color = -colors.yellowThen
ToastMessageShow("JAUNE",False)
End If
End If
Return True
End Sub
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