view안에 onDraw로 사각형을 넣을려고합니다.

Question

package com.example.dodgegame;

import com.example.dodgegame.Gameplayer.MyView;

import android.content.Context;
import android.content.pm.ActivityInfo;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.os.Bundle;
import android.os.Handler;
import android.support.v7.app.ActionBarActivity;
import android.view.KeyEvent;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.view.View.OnKeyListener;
import android.widget.RelativeLayout;
import android.widget.TextView;



public class Gamecanvas extends ActionBarActivity {
    
	private int minute = 0;
	private int second = 0;
	private TextView text;
	private TextView mCountDown;
	private TextView t;
    private int count = 0;
    
	private Handler handler = new Handler();//초기화
    
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);   
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, 
                                             WindowManager.LayoutParams.FLAG_FULLSCREEN);
        setContentView(R.layout.gamecanvas);
        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
        
        handler.removeCallbacks(doUpdateTimer);
        handler.postDelayed(doUpdateTimer, 1000);
        
        mCountDown = (TextView)findViewById(R.id.textview02);
        mCountDown.setText(String.valueOf(count));
        autoCountHandler.postDelayed(autoCountRunnable, 1000);

      }

    private Runnable doUpdateTimer = new Runnable() {
    	public void run() {
    		
    		second ++;
    		if(second >=60) 
    		{
    			second = 0;
    			minute++;
    			if(minute >=60) 
    			{
    				minute = 0;
    			}
    		}
    		text = (TextView) findViewById(R.id.textview04);
    		String strFormat = String.format("%02d:%02d", minute,second);
    		text.setText(strFormat);
    		
    		handler.postDelayed(doUpdateTimer, 1000);
    	}
    };
    private Handler autoCountHandler = new Handler();
    private Runnable autoCountRunnable = new Runnable() {
    	public void run() {
    		count++;
    		mCountDown.setText(String.valueOf(count));
    		if(count>0)
    		{
    			autoCountHandler.postDelayed(autoCountRunnable, 500);
    		    
    		}
    		
    		else 
    		{
    			if(autoCountHandler != null){
    				autoCountHandler.removeCallbacks(autoCountRunnable);
    			}
    		}
    		
    	}
    };
}

지금 이 코드까지 한걸 실행시키면 핸드폰이 가로방향으로 돌아가면서 실행되고 좌측상단과 우측상단에 

각각 타이머가 동작하게 됩니다. 제가 궁금한건 화면 중앙에 제가 키보드로 w,a,s,d를 누르면 상 하 좌 우 로 

움직이는 사각형을 넣고싶습니다. 

package com.example.dodgegame;

import android.app.Activity;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnKeyListener;

public class Gameplayer extends Activity{
	int x=100, y = 100;
	
	protected class MyView extends View {
		public MyView(Context context) {
			super(context);
		}
		@Override
		protected void onDraw(Canvas canvas) {
			Paint paint =new Paint();
			canvas.drawRect(x,y,x+50,y+50,paint);
		}
	}
	
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		MyView w = new MyView(this);
		w.setFocusable(true);
		w.setFocusableInTouchMode(true);
		setContentView(w);
		w.setOnKeyListener(new OnKeyListener() {
			public boolean onKey(View v, int keyCode, KeyEvent event) {
				if(event.getAction()==KeyEvent.ACTION_UP) {
					switch (keyCode) {
					case KeyEvent.KEYCODE_J:
						x -= 30;
						break;
					case KeyEvent.KEYCODE_K:
						x += 30;
						break;
					}
					v.invalidate();
					return true;
				}
				return false;
			}
		});
	}

}

그래서 이 코드를 위쪽에 배치를 해보니까 어플이 실행이 안되고 꺼져버립니다. 뭐가 문제인지 고수님들 

답변 부탁드립니다.

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