Android多指触摸

import java.util.ArrayList;import java.util.List;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.Paint.Style;import android.graphics.PointF;import android.util.AttributeSet;import android.view.MotionEvent;import android.view.View;public class MulitTouchView extends View {private static final String TAG="MulitTouchView";private List<Integer> mColors;private List<PointF> mTouchPoints=new ArrayList<PointF>();private Paint mPaint;public MulitTouchView(Context context) {this(context,null);}public MulitTouchView(Context context, AttributeSet attrs) {super(context, attrs);mColors=new ArrayList<Integer>();mColors.add(Color.RED);mColors.add(Color.BLUE);mColors.add(Color.GREEN);mColors.add(Color.CYAN);mColors.add(Color.YELLOW);mColors.add(Color.DKGRAY);mColors.add(Color.MAGENTA);mColors.add(Color.GRAY);mColors.add(Color.LTGRAY);mColors.add(Color.BLACK);mPaint=new Paint(Paint.ANTI_ALIAS_FLAG);mPaint.setStyle(Style.STROKE);mPaint.setStrokeWidth(5);}@Overridepublic boolean onTouchEvent(MotionEvent event) {int count=event.getPointerCount();int action=(event.getAction()&MotionEvent.ACTION_MASK);//多指和单指合并switch (action) {case MotionEvent.ACTION_DOWN:mTouchPoints.clear();for(int i=0;i<count;i++){int id=event.getPointerId(i);if(id>=count){return false;}float x=event.getX(id);float y=event.getY(id);ArrayList<PointF> points=new ArrayList<PointF>();PointF point=new PointF();point.set(x,y);points.add(point);mTouchPoints.add(point);}invalidate();return true;case MotionEvent.ACTION_MOVE:mTouchPoints.clear();for(int i=0;i<count;i++){int id=event.getPointerId(i);if(id>=count){continue;}float x=event.getX(id);float y=event.getY(id);PointF point=new PointF();point.set(x,y);mTouchPoints.add(point);}invalidate();return true;case MotionEvent.ACTION_UP:return true;default:return super.onTouchEvent(event);}}@Overrideprotected void onDraw(Canvas canvas) {super.onDraw(canvas);for(int i=0;i<mTouchPoints.size();i++){PointF p=mTouchPoints.get(i);mPaint.setColor(mColors.get(i));canvas.drawCircle(p.x, p.y, 80, mPaint);}}}
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