android自由落体运动源代码

package com.swb.gamedemo.view; import java.util.ArrayList; import java.util.Random; import android.content.Context; import android.content.res.Resources; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.util.AttributeSet; import android.view.SurfaceHolder; import android.view.SurfaceView; public class BallView extends SurfaceView implements SurfaceHolder.Callback{ public static final int V_MAX=35; public static final int V_MIN=15; public static final int WOOD_EDGE=60; public static final int GROUND_LING=450; public static final int UP_ZERO=30; public static final int DOWN_ZERO=60; Bitmap[]bitmapArray=new Bitmap[6]; Bitmap bmpBack; Bitmap bmpWood; String fps="FPS:N/A"; int ballNumber=8; ArrayList<Movable> alMovable=new ArrayList<Movable>(); DrawThread dt; public BallView(Context context) { super(context); getHolder().addCallback(this); initBitmaps(getResources()); initMovables(); dt=new DrawThread(this, getHolder()); // TODO Auto-generated constructor stub } private void initBitmaps(Resources resources) { // TODO Auto-generated method stub bitmapArray[0]=BitmapFactory.decodeResource(resources,com.swb.gamedemo.R.drawable.redball); bitmapArray[1]=BitmapFactory.decodeResource(resources,com.swb.gamedemo.R.drawable.redball); bitmapArray[2]=BitmapFactory.decodeResource(resources,com.swb.gamedemo.R.drawable.redball); bitmapArray[3]=BitmapFactory.decodeResource(resources,com.swb.gamedemo.R.drawable.redball); bitmapArray[4]=BitmapFactory.decodeResource(resources,com.swb.gamedemo.R.drawable.redball); bitmapArray[5]=BitmapFactory.decodeResource(resources,com.swb.gamedemo.R.drawable.redball); bmpBack=BitmapFactory.decodeResource(resources, com.swb.gamedemo.R.drawable.bg); bmpWood=BitmapFactory.decodeResource(resources, com.swb.gamedemo.R.drawable.p); } private void initMovables() { // TODO Auto-generated method stub Random r=new Random(); for(int i=0;i<ballNumber;i++){ int index=r.nextInt(32); Bitmap tempBitmap=null; if(i<ballNumber/2){ tempBitmap=bitmapArray[3+index%3]; }else{ tempBitmap=bitmapArray[index%3]; } Movable m=new Movable(0, 70-tempBitmap.getHeight(), tempBitmap.getWidth()/2,tempBitmap); alMovable.add(m); } } public void doDraw(Canvas canvas){ canvas.drawBitmap(bmpBack, 0, 0, null); canvas.drawBitmap(bmpWood, 0,60, null); for( Movable m:alMovable){ m.drawSelf(canvas); } Paint p=new Paint(); p.setColor(Color.BLUE); p.setTextSize(18); p.setAntiAlias(true); canvas.drawText(fps, 30, 30, p); } public BallView(Context context,AttributeSet attrs){ super(context,attrs); } @Override public void surfaceCreated(SurfaceHolder holder) { // TODO Auto-generated method stub if(!dt.isAlive()){ dt.start(); } } @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { // TODO Auto-generated method stub } @Override public void surfaceDestroyed(SurfaceHolder holder) { // TODO Auto-generated method stub dt.flag=false; dt=null; } }