Android开发之底图局部加载移动的方法示例
时间：2021-05-03 10:02:52|栏目：Android代码|点击： 次
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。
更多关于Android相关内容感兴趣的读者可查看本站专题：《Android图形与图像处理技巧总结》、《Android开发入门与进阶教程》、《Android调试技巧与常见问题解决方法汇总》、《Android基本组件用法总结》、《Android视图View技巧总结》、《Android布局layout技巧总结》及《Android控件用法总结》
希望本文所述对大家Android程序设计有所帮助。
