Android开发之底图局部加载移动的方法示例

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。