Rotating Image on A canvas in android

Question

I want to Rotate Image according to a specific angle in android ,some thing like a compass...

I have this code...it works on drawPath() but i want to replace the path and the Drawing thing with image.. I tried to create a bitmap image ,DrawBitmapImage , but the image does not Rotate like the path..Any Help PLease?

public void draw(Canvas canvas) {     double angle = calculateAngle(currentLongitude, currentLatitude, targetLongitude, targetLatitude);      //Correction;     angle-=90;      //Correction for azimuth     angle-=azimuth;      if((getContext() instanceof Activity) && ((Activity)getContext()).getWindowManager().getDefaultDisplay().getOrientation()==Configuration.ORIENTATION_PORTRAIT)angle-=90;      while(angle<0)angle=angle+360;      Rect rect = canvas.getClipBounds();      int height = rect.bottom-rect.top;     int width = rect.right-rect.left;     int left = rect.left;     int top = rect.top;      if(height>width){         top+=(height-width)/2;         height=width;     }     if(width>height){         left+=(width-height)/2;         width=height;     }      float centerwidth = width/2f;     float centerheight = height/2f;      Paint p = new Paint();     p.setColor(color);     p.setStyle(Paint.Style.FILL);     p.setAntiAlias(true);      float startX = left+(float)(centerwidth+Math.cos(deg2rad(angle))*width/3.0);     float startY = top+(float)(centerheight+Math.sin(deg2rad(angle))*height/3.0);      Path path = new Path();     path.moveTo(             startX,             startY);     path.lineTo(             left+(float)(centerwidth+Math.cos(deg2rad(angle+140))*width/4.0),             top+(float)(centerheight+Math.sin(deg2rad(angle+140))*height/4.0));     path.lineTo(             left+(float)centerwidth,             top+(float)centerheight             );     path.lineTo(             left+(float)(centerwidth+Math.cos(deg2rad(angle+220))*width/4.0),              top+(float)(centerheight+Math.sin(deg2rad(angle+220))*height/4.0)             );      path.lineTo(             startX,             startY             );         canvas.drawPath(path, p); } 

Answer 1

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, null); yourCanvas.restore(); 

Pick the one that suits you the best.