I had the same challenge and came to the conclusion that overwriting onDraw will at least in the general case not work. My blog explains the reasons. What worked very well for me is the following: Create a new image bitmap and attach a brand new canvas to it. Draw the image bitmap into the … Read more
The best option for me is to create a custom TextDrawable that handles properly how to display a piece of text. Then in your CustomDrawableView in your onDraw(Canvas c) method you can call it to display the text and the oval. Take a look at this answer I wrote recently as it contains how to … Read more
I wanted a similar effect, but on an AppWidget so unfortunately I couldn’t use @EvelioTarazona’s solution. This is what I came up with, it should work with a bitmap of any shape. final Bitmap src = BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher); final Bitmap shadow = addShadow(src, src.getHeight(), src.getWidth(), Color.BLACK, 3, 1, 3); final ImageView iv = (ImageView)findViewById(R.id.image); iv.setImageBitmap(shadow); … Read more
Ok i solved my problem. I post the example code: Path p; Region r; @Override public void onDraw(Canvas canvas) { p = new Path(); p.moveTo(50, 50); p.lineTo(100, 50); p.lineTo(100, 100); p.lineTo(80, 100); p.close(); canvas.drawPath(p, paint); RectF rectF = new RectF(); p.computeBounds(rectF, true); r = new Region(); r.setPath(p, new Region((int) rectF.left, (int) rectF.top, (int) rectF.right, (int) … Read more
Here are some definitions: A Surface is an object holding pixels that are being composited to the screen. Every window you see on the screen (a dialog, your full-screen activity, the status bar) has its own surface that it draws in to, and Surface Flinger renders these to the final display in their correct Z-order. … Read more
Worked this out, turns out that android.R.color.black is not the same as Color.BLACK. Changed the code to: Paint paint = new Paint(); paint.setColor(Color.WHITE); paint.setStyle(Style.FILL); canvas.drawPaint(paint); paint.setColor(Color.BLACK); paint.setTextSize(20); canvas.drawText(“Some Text”, 10, 25, paint); and it all works fine now!!
I guess there is no solution so the answer: MediaRecorder/Android is buggy or Mobile companies didn’t care of all Android features while developing their devices Update MediaCodec is also buggy with canvas mSurface = mMediaCodec.createInputSurface(); mSurface.lockHardwareCanvas() It works on much more devices with MediaCodec but still some devices may fail to record video correctly using … Read more
Ok I’ve done it. I’m sharing this code in case someone else will need it: super.draw(canvas, mapView, true); Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG); paint.setStrokeWidth(2); paint.setColor(android.graphics.Color.RED); paint.setStyle(Paint.Style.FILL_AND_STROKE); paint.setAntiAlias(true); Point point1_draw = new Point(); Point point2_draw = new Point(); Point point3_draw = new Point(); mapView.getProjection().toPixels(point1, point1_draw); mapView.getProjection().toPixels(point2, point2_draw); mapView.getProjection().toPixels(point3, point3_draw); Path path = new Path(); path.setFillType(Path.FillType.EVEN_ODD); path.moveTo(point1_draw.x,point1_draw.y); … Read more
You can either rotate your bitmap when you draw it by using a matrix: Matrix matrix = new Matrix(); matrix.setRotate(angle, imageCenterX, imageCenterY); yourCanvas.drawBitmap(yourBitmap, matrix, null); You can also do it by rotating the canvas before drawing: yourCanvas.save(Canvas.MATRIX_SAVE_FLAG); //Saving the canvas and later restoring it so only this image will be rotated. yourCanvas.rotate(-angle); yourCanvas.drawBitmap(yourBitmap, left, top, … Read more
How about load the view to a bitmap (at some point after all your drawing/sprites etc is done), then get the pixel color from the bitmap? 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; } then use getPixel(x,y) … Read more