安卓刮刮乐效果demo

来源：互联网发布：2016年cms系统排行榜编辑：程序博客网时间：2024/05/29 11:04
代码:
package com.example.myapp.view;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.Path;import android.graphics.PorterDuff;import android.graphics.PorterDuffXfermode;import android.util.AttributeSet;import android.view.MotionEvent;import android.view.View;/** * Created by yanru.zhang on 16/7/21. * Email:yanru.zhang@renren-inc.com */public class EraserView extends View {    private int width,height;    private Paint mPaint;    private PorterDuffXfermode porterDuffXfermode;    private Path mPath;    private int downX,downY,moveX,moveY,lastX,lastY,upX,upY;    private int bgColor = Color.GRAY;    private int paintWidth = 50;    public EraserView(Context context) {        this(context,null);    }    public EraserView(Context context, AttributeSet attrs) {        this(context, attrs, 0);    }    public EraserView(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);        setLayerType(LAYER_TYPE_SOFTWARE,null);        mPaint = new Paint();        mPaint.setStyle(Paint.Style.STROKE);        mPaint.setStrokeWidth(paintWidth);        porterDuffXfermode = new PorterDuffXfermode(PorterDuff.Mode.XOR);        mPath = new Path();    }    @Override    protected void onSizeChanged(int w, int h, int oldw, int oldh) {        super.onSizeChanged(w, h, oldw, oldh);        if(w!=oldw || h!=oldh){            width = w;            height = h;        }    }    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        canvas.drawColor(bgColor);        mPaint.setXfermode(porterDuffXfermode);        canvas.drawPath(mPath,mPaint);        mPaint.setXfermode(null);    }    @Override    public boolean onTouchEvent(MotionEvent event) {        switch (event.getAction()){            case MotionEvent.ACTION_DOWN:                lastX = downX = (int)event.getX();                lastY = downY = (int)event.getY();                mPath.moveTo(downX,downY);                break;            case MotionEvent.ACTION_MOVE:                moveX = (int)event.getX();                moveY = (int)event.getY();                mPath.quadTo((lastX+moveX)/2,(lastY+moveY)/2,moveX,moveY);                invalidate();                lastX = moveX;                lastY = moveY;                break;            case MotionEvent.ACTION_UP:                upX = (int)event.getX();                upY = (int)event.getY();                mPath.quadTo(lastX,lastY,upX,upY);                invalidate();                break;        }        return true;    }    public void setPaintWidth(int width){        this.paintWidth = width;        mPaint.setStrokeWidth(width);    }    public void setBgColor(int color){        bgColor = color;    }}
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