Develop Reference

Android Create Bitmap from RelativeLayout ChildView not scalling properly

Here is the code for convert view to bitmap.
public static Bitmap loadBitmapFromView(View v) {
v.measure(View.MeasureSpec.makeMeasureSpec(v.getLayoutParams().width, View.MeasureSpec.EXACTLY),
View.MeasureSpec.makeMeasureSpec(v.getLayoutParams().height, View.MeasureSpec.EXACTLY));
v.layout(0, 0, v.getMeasuredWidth(), v.getMeasuredHeight());
Bitmap b = Bitmap.createBitmap(v.getWidth(), v.getHeight(), Bitmap.Config.RGB_565);
Canvas c = new Canvas(b);
v.draw(c);
return b;
}
Above code create real size bitmap properly. But all child position is not scaling with layout ratio.

View too large to fit into drawing cache when calling getDrawingCache()

I'm trying to take a screenshot of the contents of a LinearLayout. The layout contains a scrollview that can be of variable height/width. This code works fine when the layout is not too big (i.e. you don't need to scroll very much off screen to see everything):
View v1 = (LinearLayout)theLayout;
v1.setDrawingCacheEnabled(true);
Bitmap bitmap = Bitmap.createBitmap(v1.getDrawingCache());
v1.setDrawingCacheEnabled(false);
However, if the LinearLayout that I'm trying to capture is large, then the application crashes with a null pointer on v1.getDrawingCache().
There is an error in logcat:
05-11 13:16:20.999: W/View(17218): View too large to fit into drawing
cache, needs 4784400 bytes, only 3932160 available
How can I properly take a screenshot of this layout? Is there another way to go about it that doesn't use so much memory?

Here's what ended up working for me to capture a large off-screen view in it's entirety:
public static Bitmap loadBitmapFromView(View v)
{
Bitmap b = Bitmap.createBitmap(v.getWidth(), v.getHeight(), Bitmap.Config.ARGB_8888);
Canvas c = new Canvas(b);
v.layout(0, 0, v.getLayoutParams().width, v.getLayoutParams().height);
v.draw(c);
return b;
}
It's similar to the answer here, except that I use the view's width/height to create the bitmap

As the original question is talking about a ScrollView I just though I would add the following for anyone that was having problems getting the full height. To get the height of the ScrollView, the v.getHeight doesn't work, you need to use:
v.getChildAt(0).getHeight()
so the full thing would be:
ScrollView scrollView = (ScrollView) result.findViewById(R.id.ScrlView);
loadBitmapFromView(scrollView);
public static Bitmap loadBitmapFromView(View v)
{
int height = v.getChildAt(0).getHeight()
int width = v.getWidth()
Bitmap b = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
Canvas c = new Canvas(b);
v.layout(0, 0, v.getLayoutParams().width, v.getLayoutParams().height);
v.draw(c);
return b;
}
Just using v.getHeight just gets the screen height, not the full height of the ScrollView.

IllegalArgumentException while taking a screen shot of a custom view

While trying to make a screen shot of a custom view,I got the IllegalArgumentException : width and height must be >0. Here is what I wrote :
bitmap = loadBitmapFromView(v1);//v1 the custom view I want to picture.
public static Bitmap loadBitmapFromView(View v) {
Bitmap b = Bitmap.createBitmap( v.getLayoutParams().width, v.getLayoutParams().height, Bitmap.Config.ARGB_8888);
Canvas c = new Canvas(b);
v.layout(0, 0, v.getLayoutParams().width, v.getLayoutParams().height);
v.draw(c);
return b;
}
The line in which there is the exception : Bitmap b = Bitmap.createBitmap( v.getLayoutParams().width, v.getLayoutParams().height, Bitmap.Config.ARGB_8888);
Of course the screen shot code is executed after the view is showed,on the next_act button code

The width and height of LayoutParams can be a constant such as FILL_PARENT, and they are negative numbers.
To get the view's measured dimensions you can use:
v.getMeasuredWidth() and v.getMeasuredHeight()
However, it depends on what you're after, and whether the view has been measured.
It would probably make more sense to wait until the view has been drawn, before taking the screenshot ;-) But you'd need to explain more about your use case.

capturing image from camera and overlaying another bitmap before we save it

here tempdata is the data captured from camera, savephoto(Bitmap) is a method am using to save the image taken from camera, and it is executing accurately ,,
BUt on [2]
i am overlaying another bitmap ,, and when i am calling the savephoto(p)
it is creating an empty file in the memorycard ...
not saving any image.
how can i overlay the two bitmap on top of each other
[1]File Imgname = Environment.getExternalStorageDirectory();
Bitmap bmp = BitmapFactory.decodeByteArray(tempdata,0,tempdata.length);
imv.setImageBitmap(bmp);
savePhoto(bmp);
[2]Bitmap bmp2 = BitmapFactory.decodeResource(getResources(),R.drawable.ic_launcher);
Bitmap b = Bitmap.createBitmap(bmp.getWidth(), bmp.getHeight(), Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(b);
canvas.drawBitmap(bmp, 0,0, null);
canvas.drawBitmap(bmp2, 50, 50, null);
savePhoto(b);
any help will be greatly appreciated
thanx

you can do like this after getting after getting bitmap from camera (assume bitmap1) and your bitmap to overlay on top of bitmap1 (assume bitmap2)
call this overlayMark() with your bitmaps it will return overlay bitmap that is your required bitmap . you can save that bitmap..
private Bitmap overlayMark(Bitmap bmp1, Bitmap bmp2) {
int bh = originalBitmap.getHeight();
int bw = originalBitmap.getWidth();
Bitmap bmOverlay = Bitmap.createBitmap(bw,bh,Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(bmOverlay);
canvas.drawBitmap(bmp1, 0, 0, null);
canvas.drawBitmap(bmp2, 0,0, null);
return bmOverlay;
}

Unable to get the bitmap of a linearlayout along with its child views

I am creating the bitmap from a linearlayout with the following code
public static Bitmap loadBitmapFromView(View v ) {
//Bitmap b = Bitmap.createBitmap( v.getLayoutParams.width, v.getLayoutParams.height, Bitmap.Config.ARGB_8888);
Bitmap b = Bitmap.createBitmap( v.getLayoutParams.width, v.getLayoutParams.height, Bitmap.Config.ARGB_8888);
Canvas c = new Canvas(b);
v.layout(0, 0, v.getMeasuredWidth(), v.getMeasuredHeight());
v.draw(c);
return b;
}
but i can not see the views in it
all i can see is a big grey screen
have tried the answer at this question also Android Problems Converting ViewGroup with Children into Bitmap but still not working
My view is being inflated from xml
and when i use the code mentioned above i get force close for null pointer exception
and if i mention the width and height to some number like 200 , 200 then i am able to see the grey background only not the view in it.

You need to measure the view before layout like
v.measure(
MeasureSpec.makeMeasureSpec(v.getLayoutParams().width,MeasureSpec.EXACTLY),
MeasureSpec.makeMeasureSpec(v.getLayoutParams().height, MeasureSpec.EXACTLY));
v.layout(0, 0, v.getMeasuredWidth(), v.getMeasuredHeight());
Bitmap b = Bitmap.createBitmap(v.getWidth(), v.getHeight()
,Bitmap.Config.RGB_565);
Canvas c = new Canvas(b);
v.draw(c);