android Programming Glossary: invalidate

How to maintain multi layers of ImageViews and keep their aspect ratio based on the largest one?

http://stackoverflow.com/questions/16729169/how-to-maintain-multi-layers-of-imageviews-and-keep-their-aspect-ratio-based-on

return super.verifyDrawable dr @Override public void invalidateDrawable Drawable dr if verifyDrawable dr invalidate else super.invalidateDrawable.. void invalidateDrawable Drawable dr if verifyDrawable dr invalidate else super.invalidateDrawable dr @Override public Resources.. Drawable dr if verifyDrawable dr invalidate else super.invalidateDrawable dr @Override public Resources getResources return mResources..

ListView item background via custom selector

http://stackoverflow.com/questions/2562051/listview-item-background-via-custom-selector

to the same resource have two states so the drawable will invalidate itself when coming out of pressed state. item android state_focused..

How can I use the animation framework inside the canvas?

http://stackoverflow.com/questions/4938822/how-can-i-use-the-animation-framework-inside-the-canvas

custom view only one frame is drawn at the time until next invalidate is called which means that you have to draw your animation frame.. that it looks like ball has rotated. Call the next frame. invalidate This is just a simple illustration but I would use surfaceView..

Auto Scale TextView Text to Fit within Bounds

http://stackoverflow.com/questions/5033012/auto-scale-textview-text-to-fit-within-bounds

mult mSpacingAdd add Set the upper text size limit and invalidate the view @param maxTextSize public void setMaxTextSize float.. float maxTextSize mMaxTextSize maxTextSize requestLayout invalidate Return upper text size limit @return public float getMaxTextSize.. return mMaxTextSize Set the lower text size limit and invalidate the view @param minTextSize public void setMinTextSize float..

Make certain area of bitmap transparent on touch

http://stackoverflow.com/questions/5368774/make-certain-area-of-bitmap-transparent-on-touch

MotionEvent.ACTION_DOWN X int ev.getX Y int ev.getY invalidate break case MotionEvent.ACTION_MOVE X int ev.getX Y int.. MotionEvent.ACTION_MOVE X int ev.getX Y int ev.getY invalidate break case MotionEvent.ACTION_UP break return true @Override..

Image in Canvas with touch events

http://stackoverflow.com/questions/5743328/image-in-canvas-with-touch-events

final float dy y mLastTouchY mPosX dx mPosY dy invalidate mLastTouchX x mLastTouchY y break case MotionEvent.ACTION_UP..

Android How to draw a smooth line following your finger

http://stackoverflow.com/questions/8287949/android-how-to-draw-a-smooth-line-following-your-finger

point.x event.getX point.y event.getY points.add point invalidate Log.d TAG point point return true return super.onTouchEvent..

How to maintain multi layers of ImageViews and keep their aspect ratio based on the largest one?

http://stackoverflow.com/questions/16729169/how-to-maintain-multi-layers-of-imageviews-and-keep-their-aspect-ratio-based-on

i Layer layer mLayers.get i if layer.drawable dr return true return super.verifyDrawable dr @Override public void invalidateDrawable Drawable dr if verifyDrawable dr invalidate else super.invalidateDrawable dr @Override public Resources getResources.. true return super.verifyDrawable dr @Override public void invalidateDrawable Drawable dr if verifyDrawable dr invalidate else super.invalidateDrawable dr @Override public Resources getResources return mResources @Override public void setImageBitmap.. dr @Override public void invalidateDrawable Drawable dr if verifyDrawable dr invalidate else super.invalidateDrawable dr @Override public Resources getResources return mResources @Override public void setImageBitmap Bitmap bm throws..

ListView item background via custom selector

http://stackoverflow.com/questions/2562051/listview-item-background-via-custom-selector

@drawable list_item_gradient Even though these two point to the same resource have two states so the drawable will invalidate itself when coming out of pressed state. item android state_focused true android state_enabled false android state_pressed..

How can I use the animation framework inside the canvas?

http://stackoverflow.com/questions/4938822/how-can-i-use-the-animation-framework-inside-the-canvas

either part of a View or linked to a bitmap. In onDraw in a custom view only one frame is drawn at the time until next invalidate is called which means that you have to draw your animation frame by frame. Here is an example of bouncing ball which rotates.. the rotated canvas. canvas.restore Rotate the canvas back so that it looks like ball has rotated. Call the next frame. invalidate This is just a simple illustration but I would use surfaceView and drive frames from another thread which is a bit more..

Auto Scale TextView Text to Fit within Bounds

http://stackoverflow.com/questions/5033012/auto-scale-textview-text-to-fit-within-bounds

add float mult super.setLineSpacing add mult mSpacingMult mult mSpacingAdd add Set the upper text size limit and invalidate the view @param maxTextSize public void setMaxTextSize float maxTextSize mMaxTextSize maxTextSize requestLayout invalidate.. the view @param maxTextSize public void setMaxTextSize float maxTextSize mMaxTextSize maxTextSize requestLayout invalidate Return upper text size limit @return public float getMaxTextSize return mMaxTextSize Set the lower text size limit and.. upper text size limit @return public float getMaxTextSize return mMaxTextSize Set the lower text size limit and invalidate the view @param minTextSize public void setMinTextSize float minTextSize mMinTextSize minTextSize requestLayout invalidate..

Make certain area of bitmap transparent on touch

http://stackoverflow.com/questions/5368774/make-certain-area-of-bitmap-transparent-on-touch

boolean onTouchEvent MotionEvent ev switch ev.getAction case MotionEvent.ACTION_DOWN X int ev.getX Y int ev.getY invalidate break case MotionEvent.ACTION_MOVE X int ev.getX Y int ev.getY invalidate break case MotionEvent.ACTION_UP break.. X int ev.getX Y int ev.getY invalidate break case MotionEvent.ACTION_MOVE X int ev.getX Y int ev.getY invalidate break case MotionEvent.ACTION_UP break return true @Override public void onDraw Canvas canvas super.onDraw canvas..

Image in Canvas with touch events

http://stackoverflow.com/questions/5743328/image-in-canvas-with-touch-events

if mScaleDetector.isInProgress final float dx x mLastTouchX final float dy y mLastTouchY mPosX dx mPosY dy invalidate mLastTouchX x mLastTouchY y break case MotionEvent.ACTION_UP mActivePointerId INVALID_POINTER_ID break case MotionEvent.ACTION_CANCEL..

Android How to draw a smooth line following your finger

http://stackoverflow.com/questions/8287949/android-how-to-draw-a-smooth-line-following-your-finger

if event.getAction MotionEvent.ACTION_UP Point point new Point point.x event.getX point.y event.getY points.add point invalidate Log.d TAG point point return true return super.onTouchEvent event and add the dx dy values to the Point class class Point..

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