android-canvas

Hi, I m trying to draw a circle as shown in the picture.where my values ranges from 0-100. 0-40 green 41-60 yellow 61-80 orange and 81-100 red. the view should animate from 0 to defined value slowly,this one to achieve. I have tried the following code ,and trying to achieve, code as follows: public class GradiantActivity extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(new GradientTestView(this)); } private class GradientTestView extends View { private Paint mPaint

I have a very simple test app with a custom component MyView.java - which displays a scrollable and scalable image (representing a board in a Scrabble-like word game): 1) In my scale listener I adjust the scale factor: public boolean onScale(ScaleGestureDetector detector) { mScale *= detector.getScaleFactor(); // XXX how to adjust mOffsetX and mOffsetY ? XXX constrainZoom(); constrainOffsets(); invalidate(); return true; } 2) And then in the drawing method of my custom component I apply the translation and scale factor: protected void onDraw(Canvas canvas) { super.onDraw(canvas); canvas

I'm trying to draw an arc inside a circle to represent the temperature, but I'm having a difficult time achieving that. During my search I found those solutions This one I couldn't understand what is the scale method for, and is drawing more than one arch, which confused me a bit This post gave it a fixed size where I need the size to be controlled by the custom view in my XML layout From here I understood the concept the degrees but I didn't understand how to determine the oval size What i reached so far @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); int startTop = 0;

I have an activity in my app where there are images I use as maps. If the image is "grid aligned" to google maps then when I use the top left and bottom right corners of the map I get from googlemaps online then I can turn the users gps into an x and y on screen. However if the map is not "grid aligned" and is at an angle than the values my math returns draws the users position off screen. Obviously I am missing the part on how to handle the angle of the map so if anyone could shed some light on how to do that it would be super helpfull. I know I would have to figure out the angle in radians

By having the following codes, I have some questions. public class MainActivity extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView( new View(this) { Paint mPaint = new Paint(); @Override protected void onDraw(Canvas canvas) { // TODO Auto-generated method stub super.onDraw(canvas); int width = this.getWidth(); int height = this.getHeight(); int radius = width > height ? height/2 : width/2; int center_x = width/2; int center_y = height/2; // prepare a paint mPaint.setStyle(Paint.Style.STROKE); mPaint.setStrokeWidth(5

I created canvas that can be used to draw some shapes on it. How can I save its content to PNG file on user's SD card? G_S check out this link this link In this link you can find the method void saveImage() { try { String filename = Environment.getExternalStorageDirectory().toString(); File f = new File(filename ,"myImage.png"); f.createNewFile(); System.out.println("file created " + f.toString()); FileOutputStream out = new FileOutputStream(f); Bitmap bitmap = showImage(urlStr); bitmap.compress(Bitmap.CompressFormat.PNG, 90, out); } catch (Exception e) { e.printStackTrace(); } } which is used

I have a little drawing app and want to use "complex" shapes as brushes, i.e. a star. Drawing with a simple brush already works with this code: remotePath.reset(); remotePath.moveTo(start_x, start_y); float dx = Math.abs(end_x - start_x); float dy = Math.abs(end_y - start_y); if (dx >= TOUCH_TOLERANCE || dy >= TOUCH_TOLERANCE) { remotePath.quadTo(start_x, start_y, (end_x + start_x) / 2, (end_y + start_y) / 2); } remotePath.lineTo(end_x, end_y); // commit the path to our offscreen mCanvas.drawPath(remotePath, remotePaint); // kill this so we don't double draw remotePath.reset(); invalidate(); I

Based on my previous question of " How to create a BottomBar as StickyBottomCaptureLayout in camera2 Android api? ", I created a layout with a StickyBar (SB) which is always locked above/near the system bar. I set the default positions and coordinates of the SB and the other layout in onLayout() (exactly as my answer ). The upper layout is a simple custom DrawView which has an ArrayList of Path s drew by the user. When the device rotates, it recalls onDraw() and calls several times canvas.drawPath() . However, the Path s are redrew with the same coordinates as before but on a different

Canvas.drawText() doesn't render emojis above a certain font size on Android. Correct render at somewhere below 256 px: Incorrect render at above 256 px: (There is a similar question about Google Chrome, and just like Android, Chrome also uses the Skia graphics library, so this seems like a bug in Skia .) Apparently emojis fail to render above 256 px font size on my devices. But I'm not sure if this is the limit everywhere. Is there a way to learn the font size at which emojis disappear? Or is there a workaround for this? I've come up with a test (an empirical estimation) for the maximum font