Android实现人物在地图中移动,该怎么解决

package com.marssoft.graphicstest;


import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Bitmap.Config;
import android.graphics.drawable.BitmapDrawable;
import android.view.KeyEvent;
import android.view.View;

public class TestView extends View {
    public static final short DIRECTION_UP = 19;
    public static final short DIRECTION_DOWN = 20;
    public static final short DIRECTION_LEFT = 21;
    public static final short DIRECTION_RIGHT = 22;
    
    private int width;
    private int height;
    private Activity act = null;
    private Bitmap map = null;
    private Bitmap z[] = new Bitmap[2];
    private Bitmap rm[][] = new Bitmap[4][4];
    private Paint mPaint = new Paint();
    private Bitmap mzip = null;
    private int rx=0 , ry=0;
    
    private int moveDirection =0;        //移动方向
    private int dirction=DIRECTION_DOWN;    //目前面向
    private int move_p=0;                //移动动画
    
    public TestView(Context context) {
        super(context);
        
        act = (Activity)context;
        width = act.getWindowManager().getDefaultDisplay().getWidth();
        height = act.getWindowManager().getDefaultDisplay().getHeight();
        z[0] = new BitmapDrawable(this.getContext().getResources().openRawResource(R.drawable.m0)).getBitmap();
        z[1] = new BitmapDrawable(this.getContext().getResources().openRawResource(R.drawable.m0)).getBitmap();
        
//        HandlerThread thread = new HandlerThread("chonghua");
//        thread.start();
//        Repaint r = new Repaint(thread.getLooper());
        
        new Thread(new Repaint()).start();
        createImage();
        setFocusable(true);  //设置控制焦点
    }
    
    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        //键盘按下
        System.out.println("按键操作：" + keyCode);
        moveDirection = keyCode;
        dirction = keyCode;
        return super.onKeyDown(keyCode, event);
    }
    
    @Override
    public boolean onKeyUp(int keyCode, KeyEvent event) {
        moveDirection=0;
        move_p=0;
        return super.onKeyUp(keyCode, event);
    }
    
    
    /**
     * 创建一张地图。
     */
    public void createImage(){
        map = Bitmap.createBitmap(width, height, Config.ARGB_8888);        //创建于屏幕大小一致的图片
        Canvas canvas = new Canvas(map);        //获得画图对象
        canvas.drawColor(Color.WHITE);            //设置背景色为白色
        int r = height/32;
        int c = width/32;
        Paint p = new Paint();
        for(short i=0 ; i<r ; i++){
            for(short f=0 ; f<c ; f++){
                canvas.drawBitmap(z[0], f*32, i*32, p);
            }
        }
        mzip = new BitmapDrawable(this.getContext().getResources().openRawResource(R.drawable.r01)).getBitmap();    //获得人物
        //分解人物动作
        System.out.println("开始切图");
        for(short i=0 ; i<4 ; i++){
            for(short f=0 ; f<4 ; f++){
                rm[i][f] = Bitmap.createBitmap(mzip, f*32, i*48, 32, 48);
            }
        }
    }
    
    @Override
    protected void onDraw(Canvas canvas) {
        // TODO Auto-generated method stub
        super.onDraw(canvas);
        if(map !=null){
            canvas.drawBitmap(map, 0,0, mPaint);
            short sd = 0;
            if(dirction == DIRECTION_UP){
                sd=3;
            }else if(dirction == DIRECTION_LEFT){
                sd=1;
            }else if(dirction == DIRECTION_RIGHT){
                sd=2;
            }else if(dirction == DIRECTION_DOWN){
                sd=0;
            }
            canvas.drawBitmap(rm[sd][move_p], rx,ry, mPaint);
        }
        System.out.println("据说调用到了onDraw函数");
    }
    
    /**
     * 移动小人。
     * @param direction 方向
     */
    public void move(int direction){
        
    }
    
    
    private class Repaint implements Runnable{
        
        public void run() {
            while(true){
                if(moveDirection == DIRECTION_UP){
                    ry-=5;
                }else if(moveDirection == DIRECTION_DOWN){
                    ry+=5;
                }else if(moveDirection == DIRECTION_LEFT){
                    rx-=5;
                }else if(moveDirection  == DIRECTION_RIGHT){
                    rx+=5;
                }
                System.out.println(rx + "-" + ry);
                if(moveDirection !=0){
                    move_p++;
                    if(move_p == 4){
                        move_p=0;
                    }
                }
                //刷新
                postInvalidate();
                try {
                    Thread.sleep(50);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}