Android实现手写签名

package com.****.*****.widget; import android.content.Context;import android.graphics.Bitmap;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.Path;import android.util.AttributeSet;import android.view.MotionEvent;import android.view.View; /** * This view implements the drawing canvas. * <p/> * It handles all of the input events and drawing functions. * 签名版 */public class PaintView extends View { private Paint paint; private Canvas cacheCanvas; private Bitmap cachebBitmap; private Path path; private OnMoveLisener lisener;   public void setSize(int width,int height,OnMoveLisener lisener) { this.lisener=lisener; init(width,height); }  public PaintView(Context context, AttributeSet attrs) { super(context, attrs); //init(0,0); }  public Bitmap getCachebBitmap() { return cachebBitmap; }  private void init(int width,int height) { paint = new Paint(); paint.setAntiAlias(true); paint.setStrokeWidth(3); paint.setStyle(Paint.Style.STROKE); paint.setColor(Color.BLACK); path = new Path(); cachebBitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888); cacheCanvas = new Canvas(cachebBitmap); cacheCanvas.drawColor(Color.WHITE); }  public void clear() { if (cacheCanvas != null) {   paint.setColor(Color.WHITE);  cacheCanvas.drawPaint(paint);  paint.setColor(Color.BLACK);  cacheCanvas.drawColor(Color.WHITE);  invalidate(); } }   @Override protected void onDraw(Canvas canvas) { // canvas.drawColor(BRUSH_COLOR); canvas.drawBitmap(cachebBitmap, 0, 0, null); canvas.drawPath(path, paint); }  @Override protected void onSizeChanged(int w, int h, int oldw, int oldh) {  int curW = cachebBitmap != null ? cachebBitmap.getWidth() : 0; int curH = cachebBitmap != null ? cachebBitmap.getHeight() : 0; if (curW >= w && curH >= h) {  return; }  if (curW < w)  curW = w; if (curH < h)  curH = h;  Bitmap newBitmap = Bitmap.createBitmap(curW, curH, Bitmap.Config.ARGB_8888); Canvas newCanvas = new Canvas(); newCanvas.setBitmap(newBitmap); if (cachebBitmap != null) {  newCanvas.drawBitmap(cachebBitmap, 0, 0, null); } cachebBitmap = newBitmap; cacheCanvas = newCanvas; }  private float cur_x, cur_y;  @Override public boolean onTouchEvent(MotionEvent event) {  getParent().requestDisallowInterceptTouchEvent(true);// 通知父控件勿拦截本控件touch事件  float x = event.getX(); float y = event.getY();  switch (event.getAction()) {  case MotionEvent.ACTION_DOWN: {  cur_x = x;  cur_y = y;  path.moveTo(cur_x, cur_y);  break;  }   case MotionEvent.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;  }   case MotionEvent.ACTION_UP: {  cacheCanvas.drawPath(path, paint);  path.reset();  break;  } }  invalidate();  return true; }   public interface OnMoveLisener{ void hideWords();//主界面回调后隐藏提示文字 }}