android-canvas

I need to draw three circles in my fragment ,the circles differ in size, I refer this link The result i obtained is this This is my XML Code : UPDATED <?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="center" > <TextView android:id="@+id/large_volume" android:layout_width="185dp" android:layout_height="185dp" android:background="@drawable/circle" android:gravity="center" android:text="My name is NON" android:textColor="#FFFFFF" android

I am trying to draw an animation. To do so I have extended View and overridden the onDraw() method. What I would expect is that each time onDraw() is called the canvas would be in the state that I left it in and I could choose to clear it or just draw over parts of it (This is how it worked when I used a SurfaceView) but each time the canvas comes back already cleared. Is there a way that I can not have it cleared? Or maybe save the previous state into a Bitmap so I can just draw that Bitmap and then draw over top of it? I'm not sure if there is a way or not. But for my custom views I either

How I can draw bezier curve in canvas. I have only start point and end point. I want to draw line from start point to end point. How I can do this? Renard You can use Path.quadTo() or Path.cubicTo() for that. Examples can be found in the SDK Examples (FingerPaint). In your case you would simply need to calculate the middle point and pass then your three points to quadTo() .. Some code for you: (x1,y1) and (x3,y3) are your starting and ending points respectively. create the paint object only once (e.g. in your constructor) Paint paint = new Paint() { { setStyle(Paint.Style.STROKE); setStrokeCap

i was searching for past one day and i was not successful . i get the image from API , and i download it to a bitmap file using the following code . private Bitmap DownloadImage(String URL) { Bitmap bitmap = null; InputStream in = null; try { in = OpenHttpConnection(URL); bitmap = BitmapFactory.decodeStream(in); in.close(); } catch (IOException e1) { e1.printStackTrace(); } return bitmap; } private InputStream OpenHttpConnection(String urlString) throws IOException { InputStream in = null; int response = -1; URL url = new URL(urlString); URLConnection conn = url.openConnection(); if (!(conn

I'm trying to display a text using the code below. The problem is that the text is not centered horizontally. When I set the coordinates for drawText , it sets the bottom of the text at this position. I would like the text to be drawn so that the text is centered also horizontally. This is a picture to display my problem further: @Override protected void onDraw(Canvas canvas) { // TODO Auto-generated method stub super.onDraw(canvas); //canvas.drawRGB(2, 2, 200); Paint textPaint = new Paint(); textPaint.setARGB(200, 254, 0, 0); textPaint.setTextAlign(Align.CENTER); textPaint.setTypeface(font);

I'm trying to figure out the best way to get the pixel color value at a given point on a View . There are three ways that I write to the View: I set a background image with View.setBackgroundDrawable(...) . I write text, draw lines, etc., with Canvas.drawText(...) , Canvas.drawLine(...) , etc., to a Bitmap-backed Canvas . I draw child objects (sprites) by having them write to the Canvas passed to the View's onDraw(Canvas canvas) method. Here is the onDraw() method from my class that extends View: @Override public void onDraw(Canvas canvas) { // 1. Redraw the background image. super.onDraw