Android模拟小球自由落体2（重力感应并添加z轴）

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这次改进了昨天那个例子，添加了重力感应，并添加了z轴。这样算3D了吧（笑）。小球往屏幕里面落时会不断变小。改进了下绘图线程的控制，surfaceCreated时绘图线程启动，surfaceDestroyed时绘图线程停止。还有极小概率会出现程序崩溃，不知道是不是不同线程同时读取KCList造成的，你们可以给KCList加个同步锁试试，概率太小了不好测试。

下面是代码。

package com.example.sft;import java.util.ArrayList;import java.util.List;import java.util.Random;import android.content.Context;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Matrix;import android.graphics.Paint;import android.graphics.RadialGradient;import android.graphics.Shader;import android.hardware.Sensor;import android.hardware.SensorEvent;import android.hardware.SensorEventListener;import android.hardware.SensorManager;import android.util.AttributeSet;import android.util.Log;import android.view.MotionEvent;import android.view.SurfaceHolder;import android.view.SurfaceView;import android.view.View;public class TestSurfaceView extends SurfaceView implements SurfaceHolder.Callback{        private Paint cp;    private List<KCircle> KCList;    private Random r;    private SensorManager sm;    private MyThread mt;    public TestSurfaceView(Context context, AttributeSet attrs) {        super(context, attrs);        // TODO Auto-generated constructor stub        getHolder().addCallback(this);        cp=new Paint();        cp.setColor(Color.BLACK);        KCList=new ArrayList<KCircle>();        r=new Random();        sm=(SensorManager)context.getSystemService(context.SENSOR_SERVICE);        Sensor sensor=sm.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);        sm.registerListener(new SensorEventListener() {                        @Override            public void onSensorChanged(SensorEvent event) {                // TODO Auto-generated method stub                KCircle.ax=-event.values[0]/16;                KCircle.ay=event.values[1]/16;                KCircle.az=-event.values[2]/16;                            }                        @Override            public void onAccuracyChanged(Sensor sensor, int accuracy) {                // TODO Auto-generated method stub                            }        }, sensor, SensorManager.SENSOR_DELAY_GAME);                }            @Override    public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) {        // TODO Auto-generated method stub            }    private int getRandomColor(){        return r.nextInt()%0xff000000;    }    @Override    public void surfaceCreated(SurfaceHolder arg0) {        // TODO Auto-generated method stub        if(mt==null||!mt.isRunning()){            mt=new MyThread();            mt.start();        }            }        @Override    public void surfaceDestroyed(SurfaceHolder arg0) {        // TODO Auto-generated method stub        mt.stopThread();            }        @Override    public boolean onTouchEvent(MotionEvent event) {        // TODO Auto-generated method stub                KCList.add(new KCircle(getRandomColor(),(int)event.getX(),(int)event.getY()));        return true;    }        class MyThread extends Thread{                private boolean runningTag=true;        @Override        public void run() {            // TODO Auto-generated method stub            runningTag=true;            while(runningTag){            Canvas c=getHolder().lockCanvas();            if(c!=null){            c.drawPaint(cp);            for(int i=0;i<KCList.size();i++){                                if(KCList.get(i).isShouldRemove()){                    KCList.remove(i);                }else                    KCList.get(i).drawAndMove(c);            }                        getHolder().unlockCanvasAndPost(c);                        }                                    try {                sleep(15);            } catch (InterruptedException e) {                // TODO Auto-generated catch block                e.printStackTrace();            }            }                        Log.i("kagami", "stop");                    }                        public void stopThread(){            runningTag=false;        }                public boolean isRunning(){            return runningTag;        }    }        }

package com.example.sft;import android.graphics.Canvas;import android.graphics.Paint;import android.graphics.RadialGradient;import android.graphics.Shader;import android.util.Log;public class KCircle {        private int color;    public int x;    public int y;    public int z;    private Paint p;    private int radius;    float vx;    float vy;    float vz;    static float ax=0;    static float ay=0;    static float az=0;            public KCircle(int color){        this.color=color;        x=0;        y=0;        z=0;        vx=0;        vy=0;        vz=0;        radius=25;        p=new Paint();        p.setColor(color);        RadialGradient rg=new RadialGradient(x+10, y-10, radius,color+(0xffffffff-color)/2, color, Shader.TileMode.CLAMP);                p.setShader(rg);        p.setAntiAlias(true);    }        public KCircle(int colcr,int x,int y){        this(colcr);        this.x=x;        this.y=y;    }        public void drawAndMove(Canvas c){                draw(c);        x+=vx;        y+=vy;        z+=vz;        vy+=ay;        vx+=ax;        vz+=az;    }        public void moveTo(int x,int y){        this.x=x;        this.y=y;    }        public void draw(Canvas c){        RadialGradient rg=new RadialGradient(x+(25+z/100)/2, y-(25+z/100)/2, 25+z/100,0xffdddddd, color, Shader.TileMode.CLAMP);        p.setShader(rg);        c.drawCircle(x, y, 25+z/100, p);    }        public boolean isShouldRemove(){        if(x<-1000||x>1000||y>1000||y<-1000||(25+z/100)<=0||(25+z/100)>150)            return true;        else            return false;    }    }

上面的图片效果和真实效果有些不同。。。可能是DDMS的图片抓取机制的问题看起来有断层，实际是没有的。