Develop Reference

Capture scrollable content to Bitmap

I want to get a screenshot in a scrollable view (ViewPager), but I´m only getting a image from what is in the screen.
I have a Viewpager with two childrens
android.support.v4.view.PagerTitleStrip
NoSaveStateFrameLayout
I´m using this code to get the screenshot
private Bitmap screenShot(View view) {
Bitmap capture = null;
view.setDrawingCacheEnabled(true);
capture = Bitmap.createBitmap(view.getDrawingCache());
view.setDrawingCacheEnabled(false);
return capture;
}
I need to capture the hole content, the scrollable content that is not in screen yet.

you can create bitmap of any view by following method
public static Bitmap loadBitmapFromView(View v) {
Bitmap b = Bitmap.createBitmap(v.getWidth(), v.getHeight(), Bitmap.Config.ARGB_8888);
Canvas c = new Canvas(b);
v.draw(c);
return b;
}
simply use above with your parent view and create bitmap of entire activity

I have found how to fix that here
You have to get the child height in Scrollable View.

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.

Android: Taking snapshot activity include camera and 3D object

I have researched to find solution to take a snapshot of current activity and I found 2 solutions to taking a snapshot, but all of them can't help me get right thing which I want.
My activity use camera, and I show 3D object in that layout (same as AR, but not use marker, just draw 3D object in camera frame).
So when I use found solutions, I just get Parent layout (RelativeLayout which I use to keep both camera and 3D object) with some other objects (some button), that bitmap same as physical design screen of XML file.
I used this solution to get snapshot:
private Bitmap takeScreenShot(Activity activity)
{
View view = activity.getWindow().getDecorView();
view.setDrawingCacheEnabled(true);
view.buildDrawingCache();
Bitmap b1 = view.getDrawingCache();
Rect frame = new Rect();
activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(frame);
int statusBarHeight = frame.top;
int width = activity.getWindowManager().getDefaultDisplay().getWidth();
int height = activity.getWindowManager().getDefaultDisplay().getHeight();
Bitmap b = Bitmap.createBitmap(b1, 0, statusBarHeight, width, height - statusBarHeight);
view.destroyDrawingCache();
return b;
}
and this solution:
public Bitmap snap() {
Bitmap bitmap = Bitmap.createBitmap(this.view.getWidth(), this.view.getHeight(), Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
view.draw(canvas);
return bitmap;
}
But I got same result.
Please help me to find good solution to resolve this problem.
Thanks.

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);

List View using bitmap

I have been trying to create a bit map of a list view, where the entire list view is not visible on the screen. I am using
Bitmap mBitmap = fullView.getDrawingCache();
to create bitmap. It works ok for the part of list view that is visible on the screen but, not for the part that isn't.I would like to know if a bitmap of a list view can be created without having to display it completely on the screen. All suggestions and or solutions are appreciated.

As android only draws what is visible, may idea would be to take bitmaps in pieces and then group the bitmaps into a single one. You could first get the bitmap of first n items. Then use the scrollTo method to scroll beyond the previous n items and get the bitmap for the next n items. This way you can get bitmap of the whole list view.

Try using this method. Hack here is calling the layout and measure method of the view yourself.
public Bitmap loadBitmapFromView(View v) {
v.setLayoutParams(new ViewGroup.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT,
RelativeLayout.LayoutParams.WRAP_CONTENT));
v.measure(View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED),
View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));
v.layout(0, 0, v.getMeasuredWidth(), v.getMeasuredHeight());
Bitmap bitmap = Bitmap.createBitmap(v.getMeasuredWidth(),
v.getMeasuredHeight(),
Bitmap.Config.ARGB_8888);
Canvas c = new Canvas(bitmap);
v.layout(v.getLeft(), v.getTop(), v.getRight(), v.getBottom());
v.draw(c);
return bitmap;
}
Pass the view in this method like
LayoutInflater inflater = (LayoutInflater) this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View inflatedFrame = inflater.inflate(R.layout.my_view, null);
Bitmap bitmap = loadBitmapFromView(inflatedFrame.findViewById(R.id.id_of_your_view_in_layout));