Android中SurfaceView和view画出触摸轨迹

package picturegame.view; 
 
import android.annotation.SuppressLint; 
import android.content.Context; 
import android.graphics.Bitmap; 
import android.graphics.BitmapFactory; 
import android.graphics.Canvas; 
import android.graphics.Color; 
import android.graphics.Paint; 
import android.graphics.Paint.Style; 
import android.graphics.Path; 
import android.util.AttributeSet; 
import android.view.MotionEvent; 
import android.view.View; 
 
import com.winton.picturegame.R; 
 
/** 
* @ClassName: GameView 
* @Description: TODO(这里用一句话描述这个类的作用) 
* @author Winton winton_by@126.com 
* @date 2015年9月26日 上午8:54:37 
* 
*/ 
public class GameView extends View{ 
  
 private Paint paint = null; // 
  
 private Bitmap originalBitmap = null;//原始图 
  
 private Bitmap new1Bitmap = null; 
  
 private Bitmap new2Bitmap = null; 
  
 private float clickX =0; 
  
 private float clickY=0; 
  
 private float startX=0; 
  
 private float startY=0; 
  
 private boolean isMove = true; 
  
 private boolean isClear = false; 
  
 private int color =Color.RED;//默认画笔颜色 
  
 private float strokeWidth =20f;//默认画笔宽度 
  
 Path mPath; 
  
  
 
 public GameView(Context context) { 
  this(context,null); 
  // TODO Auto-generated constructor stub 
 } 
 public GameView(Context context,AttributeSet atts) { 
  this(context,atts,0); 
  // TODO Auto-generated constructor stub 
 } 
 @SuppressWarnings("static-access") 
 public GameView(Context context,AttributeSet atts,int defStyle) { 
  super(context,atts,defStyle); 
  // TODO Auto-generated constructor stub 
   
  originalBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.default_pic).copy(Bitmap.Config.ARGB_8888, true);//白色的画板 
  new1Bitmap=originalBitmap.createBitmap(originalBitmap); 
  mPath=new Path(); 
 } 
 
 //清楚 
 @SuppressWarnings("static-access") 
 public void clear(){ 
  isClear =true; 
  new2Bitmap=originalBitmap.createBitmap(originalBitmap); 
  invalidate();//重置 
 } 
  
 public void setStrokeWidth(float width){ 
  this.strokeWidth=width; 
  initPaint(); 
 } 
 @Override 
 protected void onDraw(Canvas canvas) { 
  // TODO Auto-generated method stub 
  super.onDraw(canvas); 
  canvas.drawBitmap(writer(new1Bitmap),0,0, null); 
   
 } 
  
 @SuppressLint("ClickableViewAccessibility") 
 @Override 
 public boolean onTouchEvent(MotionEvent event) { 
  // TODO Auto-generated method stub 
   
   
  clickX =event.getX(); 
   
  clickY=event.getY(); 
   
  if(event.getAction()==MotionEvent.ACTION_DOWN){ 
   //手指点下屏幕时触发 
    
   startX=clickX; 
   startY=clickY; 
   mPath.reset(); 
   mPath.moveTo(clickX, clickY); 
    
//   isMove =false; 
//   invalidate(); 
//   return true; 
  } 
  else if(event.getAction()==MotionEvent.ACTION_MOVE){ 
   //手指移动时触发 
   float dx=Math.abs(clickX-startX); 
   float dy=Math.abs(clickY-startY); 
//   if(dx>=3||dy>=3){ 
    //设置贝塞尔曲线的操作点为起点和终点的一半 
    float cX = (clickX + startX) / 2; 
    float cY = (clickY + startY) / 2; 
    mPath.quadTo(startX,startY, cX, cY); 
     
    startX=clickX; 
    startY=clickY; 
     
//   } 
//   isMove =true; 
//   invalidate(); 
//   return true; 
  } 
   
   
  invalidate(); 
  return true; 
 } 
  
 
 /** 
 * @Title: writer 
 * @Description: TODO(这里用一句话描述这个方法的作用) 
 * @param @param pic 
 * @param @return 设定文件 
 * @return Bitmap 返回类型 
 * @throws 
 */ 
 public Bitmap writer(Bitmap pic){ 
  initPaint(); 
   
  Canvas canvas =null; 
  if(isClear){ 
   canvas=new Canvas(new2Bitmap); 
  }else{ 
   canvas=new Canvas(pic); 
  } 
   
   //canvas.drawLine(startX, startY, clickX, clickY, paint);//画线 
   canvas.drawPath(mPath, paint); 
  if(isClear){ 
   return new2Bitmap; 
  } 
  return pic; 
 } 
  
 private void initPaint(){ 
   
  paint = new Paint();//初始化画笔 
   
  paint.setStyle(Style.STROKE);//设置为画线 
   
  paint.setAntiAlias(true);//设置画笔抗锯齿 
   
  paint.setColor(color);//设置画笔颜色 
   
  paint.setStrokeWidth(strokeWidth);//设置画笔宽度 
 } 
  
  
 /** 
 * @Title: setColor 
 * @Description: TODO(设置画笔颜色) 
 * @param @param color 设定文件 
 * @return void 返回类型 
 * @throws 
 */ 
 public void setColor(int color){ 
   
  this.color=color; 
  initPaint(); 
 } 
  
 public Bitmap getPaint(){ 
  return new1Bitmap; 
 } 
} 

package picturegame.view; 
 
import android.content.Context; 
import android.graphics.Bitmap; 
import android.graphics.BitmapFactory; 
import android.graphics.Canvas; 
import android.graphics.Paint; 
import android.graphics.Paint.Style; 
import android.graphics.Path; 
import android.util.AttributeSet; 
import android.view.MotionEvent; 
import android.view.SurfaceHolder; 
import android.view.SurfaceHolder.Callback; 
import android.view.SurfaceView; 
 
import com.winton.picturegame.R; 
 
public class GameViewSurface extends SurfaceView implements Callback,Runnable{ 
  
  
 /** 控制游戏更新循环 **/ 
 boolean mRunning = false; 
  
 /**控制游戏循环**/ 
 boolean mIsRunning = false; 
  
 /**每50帧刷新一次屏幕**/  
 public static final int TIME_IN_FRAME = 50; 
 
 private int paintColor=android.graphics.Color.WHITE;//默认画笔颜色为黑色 
  
 private float paintWidth=2f;//默认画笔宽度 
  
 private Style paintStyle=Style.STROKE;//默认画笔风格 
  
 private int paintAlph=255;//默认不透明 
  
 private Path mPath;//轨迹 
  
 private Paint mPaint;//画笔 
  
 private float startX=0.0f;//初始x 
  
 private float startY=0.0f;//初始Y 
  
 private SurfaceHolder surfaceHolder; 
  
 public Canvas mCanvas; 
  
 public boolean first=true; 
  
 Bitmap bg; 
  
 public GameViewSurface(Context context){ 
  this(context,null); 
 } 
 public GameViewSurface(Context context,AttributeSet attrs){ 
  this(context,attrs,0); 
 } 
 public GameViewSurface(Context context, AttributeSet attrs, int defStyle) { 
  super(context, attrs, defStyle); 
  // TODO Auto-generated constructor stub 
  this.setFocusable(true);//设置当前view拥有触摸事件 
   
  surfaceHolder=getHolder(); 
  surfaceHolder.addCallback(this); 
   
  mPath=new Path(); 
  initPaint(); 
   
  bg = BitmapFactory.decodeResource(getResources(), R.drawable.default_pic).copy(Bitmap.Config.ARGB_8888, true);//白色的画板 
 } 
 /** 
 * @Title: initPaint 
 * @Description: TODO(初始化画笔) 
 * @param  设定文件 
 * @return void 返回类型 
 * @throws 
 */ 
 private void initPaint(){ 
  mPaint=new Paint(); 
  mPaint.setAntiAlias(true);//消除锯齿 
  mPaint.setColor(paintColor);//画笔颜色 
  mPaint.setAlpha(paintAlph);//画笔透明度 
  mPaint.setStyle(paintStyle);//设置画笔风格 
  mPaint.setStrokeWidth(paintWidth);//设置画笔宽度 
 } 
  
 public void doDraw(){ 
  mCanvas=surfaceHolder.lockCanvas(); 
  mCanvas.drawPath(mPath, mPaint);//绘制 
  surfaceHolder.unlockCanvasAndPost(mCanvas); 
 }  
 @Override 
 public boolean onTouchEvent(MotionEvent event) { 
  // TODO Auto-generated method stub 
   
  switch (event.getAction()) { 
  case MotionEvent.ACTION_DOWN: 
   //手接触屏幕时触发 
   doTouchDown(event); 
   break; 
  case MotionEvent.ACTION_MOVE: 
   //手滑动时触发 
   doTouchMove(event); 
   break; 
    
  case MotionEvent.ACTION_UP: 
   //手抬起时触发 
    
   break; 
    
 
  default: 
   break; 
  } 
  return true; 
 } 
  
 /** 
 * @Title: doTouchDown 
 * @Description: TODO(手触摸到屏幕时需要做的事情) 
 * @param @param event 设定文件 
 * @return void 返回类型 
 * @throws 
 */ 
 private void doTouchDown(MotionEvent event){ 
   
  float touchX=event.getX(); 
  float touchY=event.getY(); 
  startX=touchX; 
  startY=touchY; 
  mPath.reset(); 
  mPath.moveTo(touchX, touchY); 
 } 
  
 /** 
 * @Title: doTouchMove 
 * @Description: TODO(手在屏幕上滑动时要做的事情) 
 * @param @param event 设定文件 
 * @return void 返回类型 
 * @throws 
 */ 
 private void doTouchMove(MotionEvent event){ 
   
  float touchX=event.getX(); 
  float touchY=event.getY(); 
   
  float dx=Math.abs(touchX-startX);//移动的距离 
   
  float dy =Math.abs(touchY-startX);//移动的距离 
   
  if(dx>3||dy>3){ 
   float cX=(touchX+startX)/2; 
   float cY=(touchY+startY)/2; 
   mPath.quadTo(startX, startY, cX, cY); 
    
   startX=touchX; 
   startY=touchY; 
    
  } 
   
 } 
  
 public void setPaintColor(int paintColor) { 
  this.paintColor = paintColor; 
  initPaint(); 
 } 
 public void setPaintWidth(float paintWidth) { 
  this.paintWidth = paintWidth; 
  initPaint(); 
 } 
 public void setPaintStyle(Style paintStyle) { 
  this.paintStyle = paintStyle; 
  initPaint(); 
 } 
 public void setPaintAlph(int paintAlph) { 
  this.paintAlph = paintAlph; 
  initPaint(); 
 } 
  
  
 @Override 
 public void run() { 
  // TODO Auto-generated method stub 
  while (mIsRunning) { 
    
   /** 取得更新游戏之前的时间 **/ 
   long startTime = System.currentTimeMillis(); 
   /** 在这里加上线程安全锁 **/ 
   synchronized(surfaceHolder){ 
    doDraw(); 
   } 
    
   /** 取得更新游戏结束的时间 **/ 
   long endTime = System.currentTimeMillis(); 
  
   /** 计算出游戏一次更新的毫秒数 **/ 
   int diffTime = (int) (endTime - startTime); 
  
   /** 确保每次更新时间为50帧 **/ 
   while (diffTime <= TIME_IN_FRAME) { 
    diffTime = (int) (System.currentTimeMillis() - startTime); 
    /** 线程等待 **/ 
    Thread.yield(); 
   } 
  
   } 
   
 } 
 @Override 
 public void surfaceCreated(SurfaceHolder holder) { 
  // TODO Auto-generated method stub 
  mCanvas =surfaceHolder.lockCanvas(); 
  mCanvas.drawBitmap(bg, 0,0, null); 
  surfaceHolder.unlockCanvasAndPost(mCanvas); 
   
  mIsRunning=true; 
  new Thread(this).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 
   mIsRunning = false; 
 } 
  
  
}