Android实现手写签名的操作方法

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 }}