Android实现手写签名
本文实例为大家分享了Android手写签名的实现方法，产品要求用户可以在app上签协议。。所以得弄个手写签名版，参考了一些资料自己写了个PaintView去继承View，实现签名功能。
packagecom.****.*****.widget;
importandroid.content.Context;
importandroid.graphics.Bitmap;
importandroid.graphics.Canvas;
importandroid.graphics.Color;
importandroid.graphics.Paint;
importandroid.graphics.Path;
importandroid.util.AttributeSet;
importandroid.view.MotionEvent;
importandroid.view.View;
/**
*Thisviewimplementsthedrawingcanvas.
*<p/>
*Ithandlesalloftheinputeventsanddrawingfunctions.
*签名版
*/
publicclassPaintViewextendsView{
privatePaintpaint;
privateCanvascacheCanvas;
privateBitmapcachebBitmap;
privatePathpath;
privateOnMoveLisenerlisener;
publicvoidsetSize(intwidth,intheight,OnMoveLisenerlisener){
this.lisener=lisener;
init(width,height);
}
publicPaintView(Contextcontext,AttributeSetattrs){
super(context,attrs);
//init(0,0);
}
publicBitmapgetCachebBitmap(){
returncachebBitmap;
}
privatevoidinit(intwidth,intheight){
paint=newPaint();
paint.setAntiAlias(true);
paint.setStrokeWidth(3);
paint.setStyle(Paint.Style.STROKE);
paint.setColor(Color.BLACK);
path=newPath();
cachebBitmap=Bitmap.createBitmap(width,height,Bitmap.Config.ARGB_8888);
cacheCanvas=newCanvas(cachebBitmap);
cacheCanvas.drawColor(Color.WHITE);
}
publicvoidclear(){
if(cacheCanvas!=null){
paint.setColor(Color.WHITE);
cacheCanvas.drawPaint(paint);
paint.setColor(Color.BLACK);
cacheCanvas.drawColor(Color.WHITE);
invalidate();
}
}
@Override
protectedvoidonDraw(Canvascanvas){
//canvas.drawColor(BRUSH_COLOR);
canvas.drawBitmap(cachebBitmap,0,0,null);
canvas.drawPath(path,paint);
}
@Override
protectedvoidonSizeChanged(intw,inth,intoldw,intoldh){
intcurW=cachebBitmap!=null?cachebBitmap.getWidth():0;
intcurH=cachebBitmap!=null?cachebBitmap.getHeight():0;
if(curW>=w&&curH>=h){
return;
}
if(curW<w)
curW=w;
if(curH<h)
curH=h;
BitmapnewBitmap=Bitmap.createBitmap(curW,curH,Bitmap.Config.ARGB_8888);
CanvasnewCanvas=newCanvas();
newCanvas.setBitmap(newBitmap);
if(cachebBitmap!=null){
newCanvas.drawBitmap(cachebBitmap,0,0,null);
}
cachebBitmap=newBitmap;
cacheCanvas=newCanvas;
}
privatefloatcur_x,cur_y;
@Override
publicbooleanonTouchEvent(MotionEventevent){
getParent().requestDisallowInterceptTouchEvent(true);//通知父控件勿拦截本控件touch事件
floatx=event.getX();
floaty=event.getY();
switch(event.getAction()){
caseMotionEvent.ACTION_DOWN:{
cur_x=x;
cur_y=y;
path.moveTo(cur_x,cur_y);
break;
}
caseMotionEvent.ACTION_MOVE:{
path.quadTo(cur_x,cur_y,x,y);
cur_x=x;
cur_y=y;
lisener.hideWords();//隐藏提醒的文字
break;
}
caseMotionEvent.ACTION_UP:{
cacheCanvas.drawPath(path,paint);
path.reset();
break;
}
}
invalidate();
returntrue;
}
publicinterfaceOnMoveLisener{
voidhideWords();//主界面回调后隐藏提示文字
}
}
以上就是本文的全部内容，希望对大家的学习有所帮助。