自定义view不显示，跪求答案

package cc.pic;



import java.util.ArrayList;

import java.util.HashMap;

import java.util.Iterator;

import java.util.List;





import android.content.Context;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.graphics.Canvas;

import android.graphics.Paint;

import android.graphics.Bitmap.Config;

import android.util.AttributeSet;

import android.util.Log;

import android.view.MotionEvent;

import android.view.View;

import android.widget.Toast;



public class MyView extends View {



	public void setBmp1(Bitmap bmp1) {

		this.bmp1 = bmp1;

		mBitmap=bmp1;

	}



	Canvas mCanvas;

	Bitmap mBitmap, bmp1, bmp2;

	Paint mPaint;

	int flag = 0;

	float movex, movey, lastx, lasty, initx, inity, initx2, inity2;

	float X_r, Y_r;



	public MyView(Context context) {

		super(context);

		X_r = 0;

		Y_r = 0;

		init();

	}



	public MyView(Context context, AttributeSet attrs) {

		super(context, attrs);

		X_r = 0;

		Y_r = 0;

		init();



	}



	public void init() {



		if(mBitmap != null)

		{

			mBitmap =Bitmap.createBitmap(bmp1.getWidth(), bmp1.getHeight(), Config.ARGB_8888);

			mCanvas=new Canvas(mBitmap);

			mPaint=new Paint();

			mPaint.setColor(0xFFFFFFFF);

			// drawImage(bmp2, 50, 0);

			drawImage(bmp1, 150, 150);

		}

		else

		{

			mBitmap=null;

		}

		Toast.makeText(getContext(), "init ing ", 1).show();

	}



	protected void onDraw(Canvas canvas) {

		if(mBitmap!=null)

		{

			canvas.drawColor(0xa1a1a1);

			canvas.drawBitmap(mBitmap, X_r, Y_r, mPaint);

			Toast.makeText(getContext(), "ondraw "+flag, 1).show();

		}

		flag++;

		super.onDraw(canvas);

	}



	List<HashMap> list = new ArrayList<HashMap>();

	HashMap map = null;



	/* 在给定的位置画位图记录好他们的初始化坐标，放入一个集合中 */

	public void drawImage(Bitmap bmp, float x, float y) {



		if (bmp == null)

			return;



		/* 记录好图片坐标 */

		map = new HashMap();

		map.put("x", x);

		map.put("y", y);

		map.put("bmp", bmp);

		list.add(map);

		Log.d("MyView", "drawImage--->" + initx + ":" + inity);

		float x_1 = bmp1.getWidth() / 2;

		float y_1 = bmp1.getHeight() / 2;

		mCanvas.drawBitmap(bmp, x - x_1, y - y_1, mPaint);

		Toast.makeText(getContext(), "drawImage ", 1).show();

		invalidate();

	}



	/* 传入点击的坐标点获得位图 */

	public Bitmap bmpClick(float mx, float my) {

		Bitmap bmpy = null;

		HashMap hashMap = null;

		for (Iterator<HashMap> it = list.iterator(); it.hasNext();) {

			hashMap = it.next();

			float dx = Float.parseFloat(hashMap.get("x").toString());// 获取到它的初始化X坐标

			float dy = Float.parseFloat(hashMap.get("y").toString());// 获取到它的初始化Y坐标

			bmpy = (Bitmap) hashMap.get("bmp");// 获取到它的初始化的位图

			Log.i("MyView", "bmpClick---> " + dx + ":" + dy);

			if (mx >= (dx - bmpy.getWidth() / 2)

					&& mx <= (dx + bmpy.getWidth() / 2)

					&& my >= (dy - bmpy.getHeight() / 2)

					&& my <= (dy + bmpy.getHeight() / 2)) {

				return bmpy;

			}

		}

		return null;

	}



	public float getX_r() {

		return X_r;

	}



	public float getY_r() {

		return Y_r;

	}



	public boolean onTouchEvent(MotionEvent event) {

		float x = event.getX();

		float y = event.getY();



		switch (event.getAction()) {

		// 点击时的(x,y)，记录初始位置

		case MotionEvent.ACTION_DOWN:

			mDragBitmap = bmpClick(x, y);

			break;

		// 移动时更新(x,y)，同时更新图片

		case MotionEvent.ACTION_MOVE:

			if (mDragBitmap != null) {

				if (mDragBitmap.equals(bmp1)) {

					movex = bmp1.getWidth() / 2;

					movey = bmp1.getHeight() / 2;

					mBitmap = bmp1.copy(Bitmap.Config.ARGB_8888, true);

					X_r = x - movex;

					Y_r = y - movey;

					invalidate();

				}

				/*

				 * else{ movex = bmp2.getWidth()/2; movey = bmp2.getHeight()/2;

				 * mBitmap = bmp2.copy(Bitmap.Config.ARGB_8888, true); X_r =

				 * x-movex; Y_r = y-movey; invalidate(); }

				 */

			}

			break;



		// 弹起时更新(x,y)，并记录位置

		case MotionEvent.ACTION_UP:



			if (mDragBitmap != null) {

				map = new HashMap();

				map.put("x", x);

				map.put("y", y);

				map.put("bmp", mDragBitmap);

				list.add(map);

				Log.e("bitmap list", "insert finish : [" + x + "," + y + "]");

			}

			mDragBitmap = null;

			break;

		}

		return true;

	}



	private Bitmap mDragBitmap = null;

}