android Programming Glossary: ondraw
Vertical (rotated) label in Android http://stackoverflow.com/questions/1258275/vertical-rotated-label-in-android getMeasuredWidth @Override protected void onDraw Canvas canvas TextPaint textPaint getPaint textPaint.setColor..
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 RuntimeException detailMessage @Override protected void onDraw Canvas canvas super.onDraw canvas Matrix matrix getImageMatrix.. @Override protected void onDraw Canvas canvas super.onDraw canvas Matrix matrix getImageMatrix if matrix null int numLayers.. int alpha int 255 layer.transformation.getAlpha Log.d TAG onDraw i alpha alpha matrix animationFrameMatrix draw canvas layer.drawable..
android ellipsize multiline textview http://stackoverflow.com/questions/2160619/android-ellipsize-multiline-textview text.toString isStale true @Override protected void onDraw Canvas canvas if isStale super.setEllipsize null resetText.. if isStale super.setEllipsize null resetText super.onDraw canvas private void resetText int maxLines getMaxLines String..
How to draw an overlay on a SurfaceView used by Camera on Android? http://stackoverflow.com/questions/2933882/how-to-draw-an-overlay-on-a-surfaceview-used-by-camera-on-android the invalidate method which is supposed to invoke the onDraw method. In fact the onDraw method is being invoked but nothing.. which is supposed to invoke the onDraw method. In fact the onDraw method is being invoked but nothing there is being printed I..
How to draw a line in android http://stackoverflow.com/questions/3616676/how-to-draw-a-line-in-android context paint.setColor Color.BLACK @Override public void onDraw Canvas canvas canvas.drawLine 0 0 20 20 paint canvas.drawLine..
Custom ImageView with drop shadow http://stackoverflow.com/questions/3693234/custom-imageview-with-drop-shadow 2f 1f 1f Color.BLACK @Override protected void onDraw Canvas canvas Rect r mRect Paint paint mPaint canvas.drawRect.. r mRect Paint paint mPaint canvas.drawRect r paint super.onDraw canvas @Override protected void onMeasure int w int h super.onMeasure.. so I'm still working on that. @Override protected void onDraw Canvas canvas Bitmap bmp BitmapFactory.decodeResource getResources..
creating a system overlay (always on top) button in android http://stackoverflow.com/questions/4481226/creating-a-system-overlay-always-on-top-button-in-android 10 mLoadPaint.setARGB 255 255 0 0 @Override protected void onDraw Canvas canvas super.onDraw canvas canvas.drawText Hello World.. 0 0 @Override protected void onDraw Canvas canvas super.onDraw canvas canvas.drawText Hello World 5 15 mLoadPaint @Override..
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 which is 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.. the centre of the screen. Y initialY @Override public void onDraw Canvas canvas super.onDraw canvas Draw background. canvas.drawBitmap.. initialY @Override public void onDraw Canvas canvas super.onDraw canvas Draw background. canvas.drawBitmap bgr 0 0 null Compute..
Make certain area of bitmap transparent on touch http://stackoverflow.com/questions/5368774/make-certain-area-of-bitmap-transparent-on-touch Color.TRANSPARENT mPaint.setAntiAlias true public void onDraw Canvas canvas canvas.drawCircle 40 40 30 mPaint hardcode to.. break return true @Override public void onDraw Canvas canvas super.onDraw canvas draw background canvas.drawBitmap.. true @Override public void onDraw Canvas canvas super.onDraw canvas draw background canvas.drawBitmap bgr 0 0 null copy..
Image in Canvas with touch events http://stackoverflow.com/questions/5743328/image-in-canvas-with-touch-events newPointerIndex break return true @Override public void onDraw Canvas canvas super.onDraw canvas canvas.save Log.d DEBUG X.. true @Override public void onDraw Canvas canvas super.onDraw canvas canvas.save Log.d DEBUG X mPosX Y mPosY canvas.translate..
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 with a straight line. Here's the code to do so public void onDraw Canvas canvas Path path new Path boolean first true for Point.. with iterpolation using the quadTo method public void onDraw Canvas canvas Path path new Path boolean first true for int.. to calculate the cubic splines as follows public void onDraw Canvas canvas Path path new Path if points.size 1 for int i..
How to draw Arc between two points on the Canvas? http://stackoverflow.com/questions/11131954/how-to-draw-arc-between-two-points-on-the-canvas image. How can I draw like this. android android canvas ondraw share improve this question Finally i got the solution from..
PorterduffXfermode: Clear a section of a bitmap http://stackoverflow.com/questions/11337679/porterduffxfermode-clear-a-section-of-a-bitmap very wrong somewhere S java android bitmap android canvas ondraw share improve this question I don't see anything unexpected...
Trying to get the display size of an image in an ImageView http://stackoverflow.com/questions/3855218/trying-to-get-the-display-size-of-an-image-in-an-imageview w h oldw oldh Do you have any clues android imageview ondraw share improve this question None of the answers here actually..
Android custom view Bitmap memory leak http://stackoverflow.com/questions/4197794/android-custom-view-bitmap-memory-leak draw the position on correct place. android out of memory ondraw custom view share improve this question You obviously have..
Clearing canvas with Canvas.drawColor() http://stackoverflow.com/questions/4650755/clearing-canvas-with-canvas-drawcolor getResources bgnd c.drawBitmap b 0 0 null android canvas ondraw share improve this question Just like you I struggled how..
Canvas and surfaceView example crash/freeze - Memory Leak? http://stackoverflow.com/questions/5650810/canvas-and-surfaceview-example-crash-freeze-memory-leak wrong in this Here is the LogCat 04 13 17 03 24.089 DEBUG ondraw 2070 lefutott 04 13 17 03 24.097 DEBUG ondraw 2070 lefutott.. 24.089 DEBUG ondraw 2070 lefutott 04 13 17 03 24.097 DEBUG ondraw 2070 lefutott 04 13 17 03 24.113 DEBUG ondraw 2070 lefutott.. 24.097 DEBUG ondraw 2070 lefutott 04 13 17 03 24.113 DEBUG ondraw 2070 lefutott 04 13 17 03 24.128 DEBUG ondraw 2070 lefutott..
Apply custom filters to camera output http://stackoverflow.com/questions/8371055/apply-custom-filters-to-camera-output canvas.drawBitmap bmp 0 0 paint invalidate to call ondraw again To make this work you need to call setWillNotDraw false..
Gettextbounds in android http://stackoverflow.com/questions/5714600/gettextbounds-in-android currentBounds Log.e Desired Text text Log.e first Ondraw Left currentBounds.left Log.e Ondraw Top currentBounds.top Log.e.. Text text Log.e first Ondraw Left currentBounds.left Log.e Ondraw Top currentBounds.top Log.e Ondraw right currentBounds.right.. Log.e Ondraw Top currentBounds.top Log.e Ondraw right currentBounds.right Log.e Ondraw bottom currentBounds.bottom..
Vertical (rotated) label in Android http://stackoverflow.com/questions/1258275/vertical-rotated-label-in-android heightMeasureSpec widthMeasureSpec setMeasuredDimension getMeasuredHeight getMeasuredWidth @Override protected void onDraw Canvas canvas TextPaint textPaint getPaint textPaint.setColor getCurrentTextColor textPaint.drawableState getDrawableState..
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 supported use setImageDrawable or setImageResource throw new RuntimeException detailMessage @Override protected void onDraw Canvas canvas super.onDraw canvas Matrix matrix getImageMatrix if matrix null int numLayers mLayers.size boolean pendingAnimations.. or setImageResource throw new RuntimeException detailMessage @Override protected void onDraw Canvas canvas super.onDraw canvas Matrix matrix getImageMatrix if matrix null int numLayers mLayers.size boolean pendingAnimations false for int.. mDrawMatrix.preConcat animationFrameMatrix int alpha int 255 layer.transformation.getAlpha Log.d TAG onDraw i alpha alpha matrix animationFrameMatrix draw canvas layer.drawable mDrawMatrix alpha pendingAnimations true else ..
android ellipsize multiline textview http://stackoverflow.com/questions/2160619/android-ellipsize-multiline-textview text start before after if programmaticChange fullText text.toString isStale true @Override protected void onDraw Canvas canvas if isStale super.setEllipsize null resetText super.onDraw canvas private void resetText int maxLines getMaxLines.. isStale true @Override protected void onDraw Canvas canvas if isStale super.setEllipsize null resetText super.onDraw canvas private void resetText int maxLines getMaxLines String workingText fullText boolean ellipsized false if maxLines..
How to draw an overlay on a SurfaceView used by Camera on Android? http://stackoverflow.com/questions/2933882/how-to-draw-an-overlay-on-a-surfaceview-used-by-camera-on-android a new frame is drawn into the SurfaceView in order to execute the invalidate method which is supposed to invoke the onDraw method. In fact the onDraw method is being invoked but nothing there is being printed I guess the camera preview is overwriting.. the SurfaceView in order to execute the invalidate method which is supposed to invoke the onDraw method. In fact the onDraw method is being invoked but nothing there is being printed I guess the camera preview is overwriting the text I'm trying..
How to draw a line in android http://stackoverflow.com/questions/3616676/how-to-draw-a-line-in-android Paint paint new Paint public DrawView Context context super context paint.setColor Color.BLACK @Override public void onDraw Canvas canvas canvas.drawLine 0 0 20 20 paint canvas.drawLine 20 0 0 20 paint The activity to start it StartDraw.java..
Custom ImageView with drop shadow http://stackoverflow.com/questions/3693234/custom-imageview-with-drop-shadow new Rect mPaint new Paint mPaint.setAntiAlias true mPaint.setShadowLayer 2f 1f 1f Color.BLACK @Override protected void onDraw Canvas canvas Rect r mRect Paint paint mPaint canvas.drawRect r paint super.onDraw canvas @Override protected void onMeasure.. @Override protected void onDraw Canvas canvas Rect r mRect Paint paint mPaint canvas.drawRect r paint super.onDraw canvas @Override protected void onMeasure int w int h super.onMeasure w h int mH mW mW getSuggestedMinimumWidth getMeasuredWidth.. draw the shadow directly to my bitmap's transparency though so I'm still working on that. @Override protected void onDraw Canvas canvas Bitmap bmp BitmapFactory.decodeResource getResources R.drawable.omen Paint paint new Paint paint.setAntiAlias..
creating a system overlay (always on top) button in android http://stackoverflow.com/questions/4481226/creating-a-system-overlay-always-on-top-button-in-android Paint mLoadPaint.setAntiAlias true mLoadPaint.setTextSize 10 mLoadPaint.setARGB 255 255 0 0 @Override protected void onDraw Canvas canvas super.onDraw canvas canvas.drawText Hello World 5 15 mLoadPaint @Override protected void onLayout boolean.. true mLoadPaint.setTextSize 10 mLoadPaint.setARGB 255 255 0 0 @Override protected void onDraw Canvas canvas super.onDraw canvas canvas.drawText Hello World 5 15 mLoadPaint @Override protected void onLayout boolean arg0 int arg1 int arg2 int..
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 views and layouts. The canvas is just a surface for drawing which is 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.. to fit the screen. X int screenW 2 ballW 2 Centre ball into the centre of the screen. Y initialY @Override public void onDraw Canvas canvas super.onDraw canvas Draw background. canvas.drawBitmap bgr 0 0 null Compute roughly ball speed and location... 2 ballW 2 Centre ball into the centre of the screen. Y initialY @Override public void onDraw Canvas canvas super.onDraw canvas Draw background. canvas.drawBitmap bgr 0 0 null Compute roughly ball speed and location. Y int dY Increase or decrease..
Make certain area of bitmap transparent on touch http://stackoverflow.com/questions/5368774/make-certain-area-of-bitmap-transparent-on-touch new PorterDuffXfermode PorterDuff.Mode.SRC mPaint.setColor Color.TRANSPARENT mPaint.setAntiAlias true public void onDraw Canvas canvas canvas.drawCircle 40 40 30 mPaint hardcode to test Problem is I think the circle straight away make the 2.. 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 draw background canvas.drawBitmap bgr 0 0 null copy the default overlay into temporary.. invalidate break case MotionEvent.ACTION_UP break return true @Override public void onDraw Canvas canvas super.onDraw canvas draw background canvas.drawBitmap bgr 0 0 null copy the default overlay into temporary overlay and punch a hole..
Image in Canvas with touch events http://stackoverflow.com/questions/5743328/image-in-canvas-with-touch-events ev.getY newPointerIndex mActivePointerId ev.getPointerId newPointerIndex break return true @Override public void onDraw Canvas canvas super.onDraw canvas canvas.save Log.d DEBUG X mPosX Y mPosY canvas.translate mPosX mPosY canvas.scale mScaleFactor.. mActivePointerId ev.getPointerId newPointerIndex break return true @Override public void onDraw Canvas canvas super.onDraw canvas canvas.save Log.d DEBUG X mPosX Y mPosY canvas.translate mPosX mPosY canvas.scale mScaleFactor mScaleFactor mImage.draw..
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 solution as you mentioned is to simply connect the points with a straight line. Here's the code to do so public void onDraw Canvas canvas Path path new Path boolean first true for Point point points if first first false path.moveTo point.x point.y.. Color.WHITE Another option is to connect the points with iterpolation using the quadTo method public void onDraw Canvas canvas Path path new Path boolean first true for int i 0 i points.size i 2 Point point points.get i if first first.. in some sharp edges. If you're really ambitious you can start to calculate the cubic splines as follows public void onDraw Canvas canvas Path path new Path if points.size 1 for int i points.size 2 i points.size i if i 0 Point point points.get..
How to draw Arc between two points on the Canvas? http://stackoverflow.com/questions/11131954/how-to-draw-arc-between-two-points-on-the-canvas paint I want to draw the arc between two points like below image. How can I draw like this. android android canvas ondraw share improve this question Finally i got the solution from this code..I am sharing here it will help to someone.....
PorterduffXfermode: Clear a section of a bitmap http://stackoverflow.com/questions/11337679/porterduffxfermode-clear-a-section-of-a-bitmap of the top level view I am thinking I am doing something very wrong somewhere S java android bitmap android canvas ondraw share improve this question I don't see anything unexpected. In the particular case of Mode.CLEAR both the color and..
Trying to get the display size of an image in an ImageView http://stackoverflow.com/questions/3855218/trying-to-get-the-display-size-of-an-image-in-an-imageview int w int h int oldw int oldh super.onSizeChanged w h oldw oldh Do you have any clues android imageview ondraw share improve this question None of the answers here actually answer the question From a Bitmap of any size displayed..
Android custom view Bitmap memory leak http://stackoverflow.com/questions/4197794/android-custom-view-bitmap-memory-leak that contains it in mai activity and still be able to draw the position on correct place. android out of memory ondraw custom view share improve this question You obviously have a memory leak. Read how to avoid memory leaks and how to..
Clearing canvas with Canvas.drawColor() http://stackoverflow.com/questions/4650755/clearing-canvas-with-canvas-drawcolor switching false else Bitmap b BitmapFactory.decodeResource getResources bgnd c.drawBitmap b 0 0 null android canvas ondraw share improve this question Just like you I struggled how to clear a top layer surfaceview in my multiple layer surfaceview..
Canvas and surfaceView example crash/freeze - Memory Leak? http://stackoverflow.com/questions/5650810/canvas-and-surfaceview-example-crash-freeze-memory-leak Tablet. I would like to know the reason or if some thing is wrong in this Here is the LogCat 04 13 17 03 24.089 DEBUG ondraw 2070 lefutott 04 13 17 03 24.097 DEBUG ondraw 2070 lefutott 04 13 17 03 24.113 DEBUG ondraw 2070 lefutott 04 13 17 03 24.128.. some thing is wrong in this Here is the LogCat 04 13 17 03 24.089 DEBUG ondraw 2070 lefutott 04 13 17 03 24.097 DEBUG ondraw 2070 lefutott 04 13 17 03 24.113 DEBUG ondraw 2070 lefutott 04 13 17 03 24.128 DEBUG ondraw 2070 lefutott 04 13 17 03 24.136.. 04 13 17 03 24.089 DEBUG ondraw 2070 lefutott 04 13 17 03 24.097 DEBUG ondraw 2070 lefutott 04 13 17 03 24.113 DEBUG ondraw 2070 lefutott 04 13 17 03 24.128 DEBUG ondraw 2070 lefutott 04 13 17 03 24.136 DEBUG ondraw 2070 lefutott 04 13 17 03 24.152..
Apply custom filters to camera output http://stackoverflow.com/questions/8371055/apply-custom-filters-to-camera-output bmp BitmapFactory.decodeByteArray jdata 0 jdata.length canvas.drawBitmap bmp 0 0 paint invalidate to call ondraw again To make this work you need to call setWillNotDraw false in the class constructor or somewhere. In onDraw you can for..
Gettextbounds in android http://stackoverflow.com/questions/5714600/gettextbounds-in-android Home.fltFontRatio 32 tp.getTextBounds String text 0 text.length currentBounds Log.e Desired Text text Log.e first Ondraw Left currentBounds.left Log.e Ondraw Top currentBounds.top Log.e Ondraw right currentBounds.right Log.e Ondraw bottom currentBounds.bottom.. String text 0 text.length currentBounds Log.e Desired Text text Log.e first Ondraw Left currentBounds.left Log.e Ondraw Top currentBounds.top Log.e Ondraw right currentBounds.right Log.e Ondraw bottom currentBounds.bottom pt.setTextSize 20.. Log.e Desired Text text Log.e first Ondraw Left currentBounds.left Log.e Ondraw Top currentBounds.top Log.e Ondraw right currentBounds.right Log.e Ondraw bottom currentBounds.bottom pt.setTextSize 20 tp.getTextBounds String text 0 text.length..
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