第一个Android简单程序-拼板

package zhch.illq;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.PixelFormat;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.LinearLayout;

public class PingBanBoard extends Activity {
    /** Called when the activity is first created. */
    Map<Integer, MyButton> buttons = new HashMap<Integer, MyButton>();
    private Map<Integer, List<Integer>> relation = new HashMap<Integer, List<Integer>>();
    // 图片分的除数
    private int colNum = 4;
    // 当前空白按钮
    private int currentBlank = colNum * colNum - 1;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        LinearLayout mainPanel = (LinearLayout) findViewById(R.id.mainPanel);
        // 创建放图片的按钮
        for (int i = 0; i < colNum; i++) {
            LinearLayout subLayout = new LinearLayout(this);
            mainPanel.addView(subLayout);
            for (int j = 0; j < colNum; j++) {
                MyButton button = new MyButton(this);
                buttons.put(i * colNum + j, button);
                subLayout.addView(button);
            }
        }
        Drawable mm = getResources().getDrawable(R.drawable.mm);
        buttons.get(1).setBackgroundDrawable(cuteImage(mm, colNum, 1, 1));
        // 设置图片
        for (int i = 0; i < (colNum * colNum); i++) {
            buttons.get(i).setBackgroundDrawable(cuteImage(mm, colNum, i % colNum, i / colNum));
            android.util.Log.v("number 1", "" + i / colNum + "===" + i % colNum);
        }

        // 设置按钮监听器
        for (int i = 0; i < (colNum * colNum); i++) {
            MyButton button = (MyButton) buttons.get(i);
            button.position = i;
            button.setOnClickListener(new OnClickListener() {

                @Override
                public void onClick(View v) {
                    MyButton view = (MyButton) v;
                    if (moveable(colNum, view.position, currentBlank)) {
                        android.util.Log.v("currentBlank", "" + currentBlank);
                        MyButton blankView = (MyButton) buttons.get(currentBlank);
                        Drawable temp = blankView.getBackground();
                        blankView.setBackgroundDrawable(view.getBackground());
                        view.setBackgroundDrawable(temp);
                        currentBlank = view.position;

                        android.util.Log.v("currentBlank ", "" + currentBlank);
                    }
                }
            });
        }
    }

    /**
     * 取正方形图片的一部分
     * 
     * @param drawable
     *            图片
     * @param count
     *            总行数
     * @param row
     *            行
     * @param col
     *            列
     * @return
     */
    public final BitmapDrawable cuteImage(Drawable drawable, int count, int row, int col) {

        int sideLength = drawable.getIntrinsicWidth(); // 取drawable的边长
        // 取小块的边长
        int subLength = sideLength / count;
        Bitmap.Config config = drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888
            : Bitmap.Config.RGB_565; // 取drawable的颜色格式
        Bitmap bitmap = Bitmap.createBitmap(sideLength, sideLength, config); // 建立对应bitmap
        Canvas canvas = new Canvas(bitmap); // 建立对应subBitmap的画布
        canvas.clipRect(0, 0, sideLength, sideLength);
        drawable.setBounds(0, 0, sideLength, sideLength);
        if ((row + 1) * (col + 1) != count * count) {
            drawable.draw(canvas); // 把drawable内容画到画布中
        }
        Bitmap subBitmap = Bitmap.createBitmap(bitmap, row * subLength, col * subLength, subLength, subLength);// 取图的一部分
        return new BitmapDrawable(subBitmap);
    }

    /**
     * 判断当前位置是否可以移动
     * 
     * @param colNum
     *            分割的阶数
     * @param position
     *            点击的位置
     * @param current
     *            当前空白位置
     * @return 是否能移动
     */
    private boolean moveable(int colNum, int position, int current) {
        android.util.Log.v("Math.abs(position - current) ", "" + Math.abs(position - current));
        android.util.Log.v("Math.max(position, current) ", "" + Math.max(position, current));
        if (Math.abs(position - current) == colNum) {
            return true;
        }

        if ((Math.abs(position - current) == 1) && (Math.max(position, current) % colNum != 0)) {

            return true;
        }
        return false;
    }
}