Too much time on onmeasure method after setImageBitmap of ImageView

Question

long time reader, first time asker so please be gently ;)

I have an Android code that displays around 10 pictures in second on ImageView. (calling setImageBitmap on ImageView to set new bitmap) This causes display lags so I'm trying to speed it as much as I can.

I found that (with traceview) that app spend a lot of time on methods:

ViewRoot.performTraversals
View.measure
FrameLayout.onmeasure
ViewGrou.measureChildWithMargins

I suspecting on ImageView measuring so i have create CustomImageView and overide onMeasure just to call super method and write sysout.

It seems that after every setImageBitmap onmeasure is called 3 times. Bitmaps are allways of the same size so there is no change. Actually it can be change from time to time when image source is changed but that should be remeasured only then.

What can I change, overide, do to eliminite this measurement impact on application speed?

If you need further information tell me and I will provide it.

Sample code

final Bitmap bitmapScaled = Bitmap.createScaledBitmap(bitmap2, width, height, false);
imageView2.setScaleType(ScaleType.CENTER_INSIDE);
if (setSize) {
    setSize(imageView2, width, height);
}
imageView2.setImageBitmap(bitmapScaled);

Method that I change to make it work faster (possibly not safe?!)

boolean layout=true;

int noL=1;

@Override
public void requestLayout() {
    if (layout){
        super.requestLayout();              
        if (noL>10){
            layout=false;
        }else{
            noL++;
        }
    }
}

Answer 1

When I had a similar problem I did the following:

public class ImageViewEx extends ImageView{
    private boolean makeRequest;
    public ImageViewEx(Context context){
        super(context);makeRequest=true;
    }
    public ImageViewEx(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }
    public ImageViewEx(Context context, AttributeSet attrs, int defStyle) {
         super(context, attrs, defStyle);
         makeRequest=true;
    }
    public void setImageBitmapNoRequestLayout(Bitmap bitmap) {
        makeRequest = false;
        setImageBitmap(bitmap);
        makeRequest = true;
    }
    @Override public void requestLayout(){
        if(makeRequest)super.requestLayout();
    }
}

Now changing the bitmap with setImageBitmapNoRequestLayout(...) does not call requestLayout().