Yes, there are methods for measuring and positioning views. They are called
onMeasure and onLayout, respectively...
2012/9/27 Serdel <adam.lichwierow...@gmail.com>
> I passed my progress bar object to my ImageView subclass but if I set the
> layout params on the progress bar object they are not accepted (it is not
> displayed at all). Of course in the xml file my custom image view is under
> the progress bar so it is not covering it. So even If I do get the correct
> resized parameters I can't use them to position my progress bar. Is there a
> method in the main UI thread or inside my ImageView subclass that I can use
> for that purpose?
>
>
> On Thursday, September 27, 2012 11:26:49 AM UTC+2, Serdel wrote:
>>
>>
>> "onMeasure may be called multiple times, yes."
>>
>> but why once with 480x817(so almost full screen) and 2nd time with
>> 227x481 (the actual size that I want). Moreover I have noticed that it is
>> called multiple times but always with this pair - first with almost
>> fullscreen, 2nd correct. How can I filter to use only the 2nd one? I don't
>> know the exact values that android can scale my image to.
>>
>>
>> W dniu czwartek, 27 września 2012 11:23:16 UTC+2 użytkownik Kostya
>> Vasilyev napisał:
>>>
>>> You're calling findViewById() on your image view object, which looks
>>> among the view's children. Since the progress bar is not a child of your
>>> image view, this returns null. Look in the activity instead, or have the
>>> activity provide the progress bar to the image view, or -- that's how I'd
>>> do it -- create a layout class that manages both image and progress views
>>> as its children.
>>>
>>> onMeasure may be called multiple times, yes.
>>>
>>> -- K
>>>
>>> 2012/9/27 Serdel <adam.lich...@gmail.com>
>>>
>>>> Hi Kostya,
>>>>
>>>> I am not sure what is complicated here... I just want to place my
>>>> progress bar in the exact location on my imageview. If do it 'hard coded'
>>>> so i.e. the image is 200x400 and I place it 50px from left and 100px from
>>>> bottom than it will be misplaced if the image is resized by android.
>>>> Therefore I want to get new resized parameters so I can calculate my
>>>> position dynamically not hard coded - it cannot be put more simple. I ahve
>>>> now subclassed my ImageView on in the onMeasure I finally got the rescaled
>>>> size. However inside that method I get null when I call:
>>>>
>>>> myCustomTwistedProgressBar = ((CustomTwistedProgressBar)
>>>> findViewById(R.id.progressBar)**)
>>>>
>>>> Moreover I also need to get the screen density before placing my progress
>>>> bar (I have different image sizes for different densities). So I am still
>>>> stuck. I don't understand why is it soooooo difficult to get the rescaled
>>>> dimensions of an imageView in android.
>>>>
>>>>
>>>> Also one very strange thing is that my onMeasure is called a couple of
>>>> times when the activity starts - first it seems that the image is spread
>>>> (width and height are full screen values) and the 2nd time they are
>>>> correct.
>>>>
>>>>
>>>> W dniu środa, 26 września 2012 23:46:37 UTC+2 użytkownik Kostya
>>>> Vasilyev napisał:
>>>>>
>>>>> Not sure what your requirements are, but the code below seems way too
>>>>> complicated to me.
>>>>>
>>>>> Subclass ViewGroup, draw the image in onDraw, override onMeasure /
>>>>> onLayout and position the progress bar (or skip the drawing and add an
>>>>> image view as a child... you'd need to position it too...)
>>>>>
>>>>> -- K
>>>>>
>>>>> 2012/9/26 Serdel <adam.lich...@gmail.com>
>>>>>
>>>>>> The problem with properly handling multiple screen sizes on Android
>>>>>> has been talked all over thousands of times. However I couldn't find a
>>>>>> solution to m problem. In a nutshell I need to align my custom progress
>>>>>> bar
>>>>>> over an imageView. I've got 3 set of drawables for the imageView -
>>>>>> ldpi(scaled for 240x400), mdpi(scaled for 320x480), hdpi(scaled for
>>>>>> 480x800). I align my custom view in Java with the following code:
>>>>>>
>>>>>> //get screen density
>>>>>> float density =
>>>>>> getBaseContext().getResources(****).getDisplayMetrics().density;
>>>>>>
>>>>>>
>>>>>> //set the progress bar position according to screen density
>>>>>> if ( density == 1.0f)
>>>>>>
>>>>>>
>>>>>> {
>>>>>> ImageView micImage = ((ImageView)
>>>>>> findViewById(R.id.imageViewClk****));
>>>>>>
>>>>>>
>>>>>> Drawable drawing = micImage.getDrawable();
>>>>>> Bitmap bitmap = ((BitmapDrawable)drawing).getB****itmap();
>>>>>>
>>>>>>
>>>>>> // Get current dimensions
>>>>>> int width = bitmap.getWidth();
>>>>>>
>>>>>>
>>>>>> int height = bitmap.getHeight();
>>>>>>
>>>>>> LayoutParams params = new
>>>>>> LayoutParams((int)(height/13.**9**4), (int)(height/13.94));
>>>>>>
>>>>>>
>>>>>> params.setMargins((int)(width/****2.30), 0, 0,
>>>>>> (int)(height/2.75));
>>>>>>
>>>>>>
>>>>>>
>>>>>> params.addRule(RelativeLayout.****ALIGN_LEFT,R.id.imageViewClk);
>>>>>>
>>>>>>
>>>>>>
>>>>>> params.addRule(RelativeLayout.****ALIGN_BOTTOM,R.id.imageViewClk****);
>>>>>>
>>>>>>
>>>>>> myCustomTwistedProgressBar.set****LayoutParams(params);
>>>>>> }else if ( density == 1.5f ){
>>>>>>
>>>>>>
>>>>>> ImageView micImage = ((ImageView)
>>>>>> findViewById(R.id.imageViewClk****));
>>>>>>
>>>>>>
>>>>>> Drawable drawing = micImage.getDrawable();
>>>>>> Bitmap bitmap = ((BitmapDrawable)drawing).getB****itmap();
>>>>>>
>>>>>>
>>>>>> int width = bitmap.getWidth();
>>>>>> int height = bitmap.getHeight();
>>>>>>
>>>>>>
>>>>>> LayoutParams params = new
>>>>>> LayoutParams((int)Math.round(h****eight/14.13),
>>>>>> (int)Math.round(height/14.13))****;
>>>>>>
>>>>>>
>>>>>> params.setMargins((int)Math.ro****und( width/2.27), 0, 0,
>>>>>> (int)Math.round(height/2.91));
>>>>>>
>>>>>>
>>>>>>
>>>>>> params.addRule(RelativeLayout.****ALIGN_LEFT,R.id.imageViewClk);
>>>>>>
>>>>>>
>>>>>>
>>>>>> params.addRule(RelativeLayout.****ALIGN_BOTTOM,R.id.imageViewClk****);
>>>>>>
>>>>>>
>>>>>> myCustomTwistedProgressBar.set****LayoutParams(params);
>>>>>> }else if ( density == 0.75f ){
>>>>>>
>>>>>>
>>>>>> ImageView micImage = ((ImageView)
>>>>>> findViewById(R.id.imageViewClk****));
>>>>>>
>>>>>>
>>>>>> Drawable drawing = micImage.getDrawable();
>>>>>> Bitmap bitmap = ((BitmapDrawable)drawing).getB****itmap();
>>>>>>
>>>>>>
>>>>>> // Get current dimensions
>>>>>> int width = bitmap.getWidth();
>>>>>>
>>>>>>
>>>>>> int height = bitmap.getHeight();
>>>>>>
>>>>>> LayoutParams params = new
>>>>>> LayoutParams((int)(height/14.**8**8), (int)(height/14.88));
>>>>>>
>>>>>>
>>>>>> params.setMargins((int)(width/****2.27), 0, 0,
>>>>>> (int)(height/2.69));
>>>>>>
>>>>>>
>>>>>>
>>>>>> params.addRule(RelativeLayout.****ALIGN_LEFT,R.id.imageViewClk);
>>>>>>
>>>>>>
>>>>>>
>>>>>> params.addRule(RelativeLayout.****ALIGN_BOTTOM,R.id.imageViewClk****);
>>>>>>
>>>>>>
>>>>>> myCustomTwistedProgressBar.set****LayoutParams(params);
>>>>>> }
>>>>>>
>>>>>>
>>>>>> The problem with properly handling multiple screen sizes on
>>>>>> Android has been talked all over thousands of times. However I couldn't
>>>>>> find a solution to m problem. In a nutshell I need to align my custom
>>>>>> progress bar over an imageView. I've got 3 set of drawables for the
>>>>>> imageView - ldpi(240x400), mdpi(320x480), hdpi(480x800). I align my
>>>>>> custom
>>>>>> view in Java with the following code:
>>>>>>
>>>>>> //get screen density
>>>>>> float density =
>>>>>> getBaseContext().getResources(****).getDisplayMetrics().density;
>>>>>>
>>>>>>
>>>>>> //set the progress bar position according to screen density
>>>>>> if ( density == 1.0f)
>>>>>>
>>>>>>
>>>>>> {
>>>>>> ImageView micImage = ((ImageView)
>>>>>> findViewById(R.id.imageViewClk****));
>>>>>>
>>>>>>
>>>>>> Drawable drawing = micImage.getDrawable();
>>>>>> Bitmap bitmap = ((BitmapDrawable)drawing).getB****itmap();
>>>>>>
>>>>>>
>>>>>> // Get current dimensions
>>>>>> int width = bitmap.getWidth();
>>>>>>
>>>>>>
>>>>>> int height = bitmap.getHeight();
>>>>>>
>>>>>> LayoutParams params = new
>>>>>> LayoutParams((int)(height/13.**9**4), (int)(height/13.94));
>>>>>>
>>>>>>
>>>>>> params.setMargins((int)(width/****2.30), 0, 0,
>>>>>> (int)(height/2.75));
>>>>>>
>>>>>>
>>>>>>
>>>>>> params.addRule(RelativeLayout.****ALIGN_LEFT,R.id.imageViewClk);
>>>>>>
>>>>>>
>>>>>>
>>>>>> params.addRule(RelativeLayout.****ALIGN_BOTTOM,R.id.imageViewClk****);
>>>>>>
>>>>>>
>>>>>> myCustomTwistedProgressBar.set****LayoutParams(params);
>>>>>> }else if ( density == 1.5f ){
>>>>>>
>>>>>>
>>>>>> ImageView micImage = ((ImageView)
>>>>>> findViewById(R.id.imageViewClk****));
>>>>>>
>>>>>>
>>>>>> Drawable drawing = micImage.getDrawable();
>>>>>> Bitmap bitmap = ((BitmapDrawable)drawing).getB****itmap();
>>>>>>
>>>>>>
>>>>>> int width = bitmap.getWidth();
>>>>>> int height = bitmap.getHeight();
>>>>>>
>>>>>>
>>>>>> LayoutParams params = new
>>>>>> LayoutParams((int)Math.round(h****eight/14.13),
>>>>>> (int)Math.round(height/14.13))****;
>>>>>>
>>>>>>
>>>>>> params.setMargins((int)Math.ro****und( width/2.27), 0, 0,
>>>>>> (int)Math.round(height/2.91));
>>>>>>
>>>>>>
>>>>>>
>>>>>> params.addRule(RelativeLayout.****ALIGN_LEFT,R.id.imageViewClk);
>>>>>>
>>>>>>
>>>>>>
>>>>>> params.addRule(RelativeLayout.****ALIGN_BOTTOM,R.id.imageViewClk****);
>>>>>>
>>>>>>
>>>>>> myCustomTwistedProgressBar.set****LayoutParams(params);
>>>>>> }else if ( density == 0.75f ){
>>>>>>
>>>>>>
>>>>>> ImageView micImage = ((ImageView)
>>>>>> findViewById(R.id.imageViewClk****));
>>>>>>
>>>>>>
>>>>>> Drawable drawing = micImage.getDrawable();
>>>>>> Bitmap bitmap = ((BitmapDrawable)drawing).getB****itmap();
>>>>>>
>>>>>>
>>>>>> // Get current dimensions
>>>>>> int width = bitmap.getWidth();
>>>>>>
>>>>>>
>>>>>> int height = bitmap.getHeight();
>>>>>>
>>>>>> LayoutParams params = new
>>>>>> LayoutParams((int)(height/14.**8**8), (int)(height/14.88));
>>>>>>
>>>>>>
>>>>>> params.setMargins((int)(width/****2.27), 0, 0,
>>>>>> (int)(height/2.69));
>>>>>>
>>>>>>
>>>>>>
>>>>>> params.addRule(RelativeLayout.****ALIGN_LEFT,R.id.imageViewClk);
>>>>>>
>>>>>>
>>>>>>
>>>>>> params.addRule(RelativeLayout.****ALIGN_BOTTOM,R.id.imageViewClk****);
>>>>>>
>>>>>>
>>>>>> myCustomTwistedProgressBar.set****LayoutParams(params);
>>>>>> }
>>>>>>
>>>>>> Everything worked fined on different screen sizes however when I
>>>>>> tried to check on 480x854 resolution the vertical alignment of the custom
>>>>>> view was incorrect. Checked with 480x800 on the same screen size and it
>>>>>> again works. I than went for a big jump and checked in GalaxyTab and the
>>>>>> horizontal and vertical alignments were wrong. Now my first though was
>>>>>> that
>>>>>> the bitmap width and height were the one of the image not the actual
>>>>>> resized imageview. So I spent a lot of time on trying to get the real
>>>>>> size
>>>>>> of the imageview and even went for viewTreeObserver but the results were
>>>>>> all the same - the correct, unchanged (unscaled?) bitmap size. So being
>>>>>> positive that the problem is not here I couldn't get through further. I
>>>>>> see
>>>>>> 2 options here:
>>>>>>
>>>>>> -either I still can't get the true 'real' size of the imageview
>>>>>> (although I think I have ruled this out by checking the size by adding
>>>>>> listeners to biewTreeObserver)
>>>>>> -or, although I get the right size and calculate the alignment
>>>>>> parameters correctly, they are somehow 'incorrectly' (differently) used
>>>>>> in
>>>>>> the layout.
>>>>>>
>>>>>>
>>>>>> Does anyone have an idea why the alignment is not working correctly?
>>>>>>
>>>>>> PS: as for the image view in layout xml file I have 2 configurations
>>>>>> for long and notlong but this image has the same description in both:
>>>>>>
>>>>>> <ImageView
>>>>>> android:src="@drawable/**clokin**g"
>>>>>>
>>>>>>
>>>>>> android:id="@+id/**imageViewClk**"
>>>>>> android:layout_height="wrap_**c**ontent"
>>>>>> android:layout_width="wrap_**co**ntent"
>>>>>>
>>>>>>
>>>>>> android:layout_**centerHorizont**al="true"
>>>>>> android:layout_above="@+id/**im**ageViewProcess"
>>>>>>
>>>>>> android:adjustViewBounds="**tru**e"
>>>>>>
>>>>>> android:cropToPadding="false"
>>>>>> android:layout_marginTop="**60d**p"
>>>>>> android:scaleType="fitXY">
>>>>>>
>>>>>> </ImageView>
>>>>>>
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>>>>>>
>>>>>
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>>>>
>>>
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