我要评论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, 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) {
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移动技术网。
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