This has to do with "list view item recycling".
Here is a good tutorial with pictures:
http://android.amberfog.com/?p=296
-- Kostya
03.07.2011 0:10, Simon Platten ?????:
Mark,
When my activity starts the listview is populated and each list view
consits of the following row:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android";
android:layout_width="fill_parent"
android:layout_height="?android:attr/listPreferredItemHeight"
android:padding="10dp">
<TextView android:id="@+id/tvFilename"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="File-name"
android:textColor="@color/blue"
android:textStyle="bold" />
<ImageView android:id="@+id/ivthumbNail"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/tvFilename"
android:layout_marginRight="6dip" />
<CheckBox android:id="@+id/chkUse"
android:layout_width="100dip"
android:layout_height="wrap_content"
android:layout_below="@+id/tvFilename"
android:layout_alignParentRight="true"
android:textColor="@color/blue"
android:text="Use"
android:checked="true"/>
<RelativeLayout android:id="@+id/llRotationButtons"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_below="@+id/chkUse"
android:gravity="right">
<ImageButton android:id="@+id/btnCCW"
android:layout_width="48dip"
android:layout_height="48dip"
android:src="@drawable/ccw_rotate_btn"/>
<ImageButton android:id="@+id/btnCW"
android:layout_width="48dip"
android:layout_height="48dip"
android:src="@drawable/cw_rotate_btn"
android:layout_toRightOf="@+id/btnCCW"
android:layout_marginLeft="6dip"/>
</RelativeLayout>
</RelativeLayout>
This all works well, when either button btnCCW or btnCW is called, a
listener is called that rotates the image view either clockwise or
counter-clockwise by 90 degrees, this also works well and I can see
that the image in the listview is rotating, however when the row goes
out of view the rotation is ignored.
I don't understand what you were saying in your last post, can you
please clarify?
Thank you,
Simon
On Sat, Jul 2, 2011 at 3:25 PM, Mark Murphy <[email protected]
<mailto:[email protected]>> wrote:
On Sat, Jul 2, 2011 at 10:14 AM, Simon Platten
<[email protected]
<mailto:[email protected]>> wrote:
> I can't call rotateThumbnail directly from getView as it is the
result of an
> onClick from one of the buttons also in the view for that item.
Then why are you expecting your images to be rotated when you return a
row from getView(), if you are not rotating them?
> The ImageView that is rotated is from the array that the list
view uses.
No, it is not, at least not based on the code that you pasted above.
Which is good, because maintaining an array of ImageViews would be a
bad move.
You are getting your ImageView via:
ImageView ivThumbnail = (ImageView)v.findViewById(R.id.ivthumbNail);
This is returning the ImageView from the row (recycled or newly
inflated). It is not from "the array that the list view uses".
You are setting the background of this ImageView to a *newly decoded
bitmap* from your file. That too is sub-optimal code, as it means you
are performing disk I/O on the main application thread on every
getView() call, so your scrolling will be sluggish. Moreover, you are
not rotating the image here, so therefore it will not be rotated,
since it is a *newly decoded bitmap*.
If you want to rotate your image, then please rotate your image.
--
Mark Murphy (a Commons Guy)
http://commonsware.com | http://github.com/commonsguy
http://commonsware.com/blog | http://twitter.com/commonsguy
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Sy
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