这里有新鲜出炉的精品教程,程序狗速度看过来!
Android是一种基于Linux的自由及开放源代码的操作系统,主要使用于移动设备,如智能手机和平板电脑,由Google公司和开放手机联盟领导及开发。尚未有统一中文名称,中国大陆地区较多人使用“安卓”或“安致”。
这篇文章主要介绍了Android开发之底图局部加载移动的方法,涉及Android针对图片与屏幕属性的读取、计算、设置等相关操作技巧,需要的朋友可以参考下
本文实例讲述了Android开发之底图局部加载移动的方法。分享给大家供大家参考,具体如下:
- public class MapMgr {
- public static MapMgr mapMgr = null;
- private int map_num = 28;
- private int b_x = 0;
- private int b_y = 0;
- private int width = 0;
- private int height = 0;
- private Bitmap bmpView = null;
- //create by danielinbiti,前提,你图片确实比屏幕大,如果不比屏幕大,下面注释行修改一下即可。
- public static void init(int width, int height) {
- if (mapMgr == null) {
- mapMgr = new MapMgr(width, height);
- }
- }
- public static MapMgr getInstance() {
- return mapMgr;
- }
- public MapMgr(int width, int height) {
- this.width = width;
- this.height = height;
- Bitmap bmp = PicMgr.getInstance().getBackGroundBitmap();
- b_x = (bmp.getWidth() - width) / 2; //保证图片比屏幕大
- b_y = (bmp.getHeight() - height) / 2;
- bmpView = Bitmap.createBitmap(bmp, b_x, b_y, width, height);
- }
- public void logic() {}
- public void mapDown() {
- Bitmap bmp = PicMgr.getInstance().getBackGroundBitmap();
- if (b_y + height < bmp.getHeight()) {
- b_y = b_y + bmp.getHeight() / map_num;
- if (b_y + height > bmp.getHeight()) {
- b_y = bmp.getHeight() - height;
- }
- }
- bmpView = Bitmap.createBitmap(bmp, b_x, b_y, width, height);
- }
- public void mapUp() {
- Bitmap bmp = PicMgr.getInstance().getBackGroundBitmap();
- if (b_y > 0) {
- b_y = b_y - bmp.getHeight() / map_num;
- if (b_y < 0) {
- b_y = 0;
- }
- }
- bmpView = Bitmap.createBitmap(bmp, b_x, b_y, width, height);
- }
- public void mapLeft() {
- Bitmap bmp = PicMgr.getInstance().getBackGroundBitmap();
- if (b_x > 0) {
- b_x = b_x - bmp.getWidth() / map_num;
- if (b_x < 0) {
- b_x = 0;
- }
- }
- bmpView = Bitmap.createBitmap(bmp, b_x, b_y, width, height);
- }
- public void mapRight() {
- Bitmap bmp = PicMgr.getInstance().getBackGroundBitmap();
- if (b_x + width < bmp.getWidth()) {
- b_x = b_x + bmp.getWidth() / map_num;
- if (b_x + width > bmp.getWidth()) {
- b_x = bmp.getHeight() - width;
- }
- }
- bmpView = Bitmap.createBitmap(bmp, b_x, b_y, width, height);
- }
- public void draw(Canvas canvas) {
- Paint paint = new Paint();
- if (bmpView != null) {
- canvas.drawBitmap(bmpView, 0, 0, paint);
- }
- }
- }
调用
- public void onKeyDownDeal(int keyCode) {
- if (keyCode == KeyEvent.KEYCODE_DPAD_UP) {
- MapMgr.getInstance().mapUp();
- } else if (keyCode == KeyEvent.KEYCODE_DPAD_DOWN) {
- MapMgr.getInstance().mapDown();
- } else if (keyCode == KeyEvent.KEYCODE_DPAD_LEFT) {
- MapMgr.getInstance().mapLeft();
- } else if (keyCode == KeyEvent.KEYCODE_DPAD_RIGHT) {
- MapMgr.getInstance().mapRight();
- }
- }
然后使用线程调用draw刷新即可。
对于触摸移动只是坐标计算方式不同,其它都类似。另外扩充到GIS等,可以根据小图片粘贴实现局部加载内容。
希望本文所述对大家Android程序设计有所帮助。
来源: http://www.phperz.com/article/17/0913/345721.html