Different android versions have different resolutions, and the length and width of the same image are different! Obtain the screen width and height.

Use canvas today. when the drawBitmap method draws an image, it finds a problem. When it is made in version 2.1, It is center-centered. When it is used in version 2.2, it finds the same image, but it cannot be centered. After reading the code, I used the same image and thought about it. It is estimated that it has something to do with the version. So I tested it and found the same test code, in version 2.1, the screen length and width are 533*320, and the width is 480*320. In version 2.2, the screen length and width are 800*480. I suddenly realized this result, because in my code, the width and height of the screen are unified to 480*320, the coordinates of an image are determined by the width and height of the screen and the image. The code is roughly as follows: Paint paint = new Paint (); // brush int screenWidth = 480; // screen width int screenHeight = 320; // screen height Bitmap bm = BitmapFactory. decodeResource (activity. getResources (), R. drawable. bnkjs); // picture currentX = screenWidth/2-bm.getWidth ()/2; // picture X coordinate currentY = screenHeight/2-bm.getHeight ()/2; // picture Y coordinate canvas. drawBitmap (bm, currentX, currentY, paint); then, the screen width and height are changed to get the width and height of the current screen, and then the screen can be normally centered. The Code is as follows: paint paint = new Paint (); // Paint int screenWidth = wm. getdefadisplay display (). getWidth (); // screen width int screenHeight = wm. getdefadisplay display (). getHeight (); // screen height Bitmap bm = BitmapFactory. decodeResource (activity. getResources (), R. drawable. bnkjs); // picture currentX = screenWidth/2-bm.getWidth ()/2; // picture X coordinate currentY = screenHeight/2-bm.getHeight ()/2; // picture Y coordinate canvas. drawBitmap (bm, currentX, currentY, paint );