android-canvas

In my app I create a canvas and add some bitmaps on it. The problem is that the objects are adding why touch the screen. So on one screens they appear on the middle on different the same, but their position in pixels are different. I mean that I got tablet and smartphone. When I touch one the object appear on both devices (multiplayer) but its not in the same place, because its passing the position by x and y. If someone understand what I mean, can you help me? Probably it must have something common with counting the ratio. I am guessing the problem you are having is that the screens are

I am trying to program an application which has to display on the mobile phone's screen what is being filmed by the front camera [The application is not recording/saving anything in the memory of the phone]. Also in case a face is filmed (and detected), it has to appear sourrended by a rectangle. To do so I'm using: A Surfaceview to display what is being filmed by the front camera. A FaceDetectionListener to detect faces in the camera input. So far the application displays properly what is being filmed by the front camera. It also detects correctly faces. But I'm not able to draw the boundary

I want to build a tool on Android where the user can paint some simple objects over a picture (eg line, circle or arrow). I started trying the line part first, and indeed I could succeed on painting it. The logic is that the user taps at one point and then drags their finger, painting the line. I use a class like this (it is based on DonGru's answer here ): public class DrawView extends View { Paint paint = new Paint(); float Sx, Sy, Lx, Ly; public DrawView(Context context, float x1, float y1, float x2, float y2) { super(context); paint.setColor(Color.RED); Sx=x1; Sy=y1; Lx=x2; Ly=y2; }

Can any body have solution regarding how to draw on canvas using finger after zoom in and zoom out? I done pinch to zoom for canvas but stucking point is not draw right coordinate. I done more R&D from google. I have CustomView Class which i share on below. public class DrawingView extends View { ArrayList<Path> pathList = new ArrayList<Path>(); Rect mRect = new Rect(); private static final int INVALID_POINTER_ID = -1; public Bitmap mMyChracter; private float mPosX; private float mPosY; private float mLastTouchX; private float mLastTouchY; private int mActivePointerId = INVALID_POINTER_ID;

I have a HorizontalScrollView in which there are multiple views inside it. I have implemented pinch zoom gesture in which multiple views, which are between my two fingers, are scaled. But I am facing one glitch. When I am doing pinch zoom, the mid point of pinch zoom is moving but for user experience I want this point to be remain fixed and other things should adjust itself while scaling so that mid point remains static. Can someone tell me how to do it. onDraw() method of custom view is Rect r =new Rect(0, 0, 700, 40); public void onDraw(Canvas canvas) { float kk=mScaleFactor; //this variable