android实现手写签名功能

概述android实现手写签名功能 本文实例为大家分享了android手写签名展示的具体代码,供大家参考,具体内容如下 代码简单,就不发demo了,直接贴代码 package com.xx; import android.content.Context; import android.graphics.Bitmap; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android

本文实例为大家分享了androID手写签名展示的具体代码，供大家参考，具体内容如下

代码简单，就不发demo了，直接贴代码

package com.xx;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.os.Bundle;import androID.support.v7.app.AppCompatActivity;import androID.vIEw.MotionEvent;import androID.vIEw.VIEw;import androID.Widget.button;import androID.Widget.FrameLayout;import androID.Widget.ImageVIEw;import com.xx.R;/** * Description: 签名类 * copyright:  copyright (c)2018 * Company: * author:   Corwin * version:   1.0 * date:    2018/9/5 18:32 * Modification History: * Date     Author   Version   Description * ------------------------------------------------------------------ * 2018/9/5  Corwin   1.0     1.0 Version */public class SignatureActivity extends AppCompatActivity { private ImageVIEw imageSign; private SignatureVIEw mVIEw; @OverrIDe public voID onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  setContentVIEw(R.layout.activity_signature);  imageSign = findVIEwByID(R.ID.iv_sign);  FrameLayout frameLayout = findVIEwByID(R.ID.fl_vIEw);  mVIEw = new SignatureVIEw(this);  frameLayout.addVIEw(mVIEw);  mVIEw.requestFocus();  button btnClear = findVIEwByID(R.ID.btn_clear);  btnClear.setonClickListener((v) -> {    mVIEw.clear();  });  button btnOk = findVIEwByID(R.ID.btn_ok);  btnOk.setonClickListener((v) -> {    Bitmap imageBitmap = mVIEw.getCachebBitmap();    imageSign.setimageBitmap(imageBitmap);  }); } /**  * 自定义签名控件  */ class SignatureVIEw extends VIEw {  //画笔  private Paint paint;  //画布  private Canvas cacheCanvas;  //位图  private Bitmap cachebBitmap;  //图片保存路径  private Path path;  //位图缓存  public Bitmap getCachebBitmap() {   return cachebBitmap;  }  public SignatureVIEw(Context context) {   super(context);   init();  }  /**   * 初始化   */  private voID init() {   //设置画笔   paint = new Paint();   paint.setAntiAlias(true);   paint.setstrokeWIDth(3);   paint.setStyle(Paint.Style.stroke);   paint.setcolor(color.BLACK);   path = new Path();   //创建位图   cachebBitmap = Bitmap.createBitmap(10,10,Bitmap.Config.ARGB_8888);   //用自定义位图构建画布   cacheCanvas = new Canvas(cachebBitmap);   //设置画布为白色   cacheCanvas.drawcolor(color.WHITE);  }  /**   * 清除画板，重置画笔   */  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.drawBitmap(cachebBitmap,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,null);   }   cachebBitmap = newBitmap;   cacheCanvas = newCanvas;  }  private float cur_x,cur_y;  @OverrIDe public boolean ontouchEvent(MotionEvent event) {   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;     break;    }    case MotionEvent.ACTION_UP: {     cacheCanvas.drawPath(path,paint);     path.reset();     break;    }   }   invalIDate();   return true;  } }}

布局文件：

<?xml version="1.0"?><linearLayout xmlns:androID="http://schemas.androID.com/apk/res/androID"  androID:layout_wIDth="match_parent"  androID:layout_height="match_parent"  androID:orIEntation="vertical"  > <ImageVIEw   androID:ID="@+ID/iv_sign"   androID:layout_wIDth="match_parent"   androID:layout_height="0dp"   androID:layout_gravity="center"   androID:layout_marginBottom="3dp"   androID:layout_weight="1"   androID:background="@color/white"   /> <FrameLayout   androID:ID="@+ID/fl_vIEw"   androID:layout_wIDth="match_parent"   androID:layout_height="0dp"   androID:layout_weight="1"   androID:background="@color/white"   /> <linearLayout   androID:layout_wIDth="match_parent"   androID:layout_height="wrap_content"   androID:background="@androID:drawable/bottom_bar"   androID:paddingtop="3dp"   >  <button    androID:ID="@+ID/btn_ok"    androID:layout_wIDth="0dp"    androID:layout_height="wrap_content"    androID:layout_weight="1"    androID:text="确定"    />  <button    androID:ID="@+ID/btn_clear"    androID:layout_wIDth="0dp"    androID:layout_height="wrap_content"    androID:layout_weight="1"    androID:text="清除"    /> </linearLayout></linearLayout>

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持我们。

总结

以上是内存溢出为你收集整理的android实现手写签名功能全部内容，希望文章能够帮你解决android实现手写签名功能所遇到的程序开发问题。

如果觉得内存溢出网站内容还不错，欢迎将内存溢出网站推荐给程序员好友。