android 签名板_使用签名板库的Android签名捕获示例

r囧r小猫 2022-12-07 14:00 269阅读 0赞

![8c5a3882e5f817af075e4bea8ffd2edc.png][]

android 签名板

Here you will get android signature capture example.

在这里，您将获得android签名捕获示例。

You may have seen many eCommerce companies like Amazon provides a facility for digital signature. You can implement that feature in your app easily by using a library called **Signature Pad**.

您可能已经看到像Amazon这样的许多电子商务公司提供了数字签名功能。 您可以使用名为**Signature Pad**的库轻松地在应用程序中实现该功能。

**Video Demo**

**影片示范**

Below tutorial shows you how to do this.

下面的教程显示了如何执行此操作。

## Android签名捕获示例 **(**Android Signature Capture Example**)** ##

**Add to Layout**

**添加到布局**

You can simply add a signature drawing view to your xml layout by using following tag.

您可以使用以下标记简单地将签名绘图视图添加到xml布局中。

<com.github.gcacace.signaturepad.views.SignaturePad
             android:layout_width="match_parent"
             android:layout_height="200dp"
             android:id="@+id/signaturePad"/>

**Apply Listener**

**应用监听器**

You can simply apply a listener to Signature Pad widget in following way.

您可以通过以下方式简单地将侦听器应用于Signature Pad小部件。

signaturePad = (SignaturePad) findViewById(R.id.signaturePad);
     signaturePad.setOnSignedListener(new SignaturePad.OnSignedListener() {
      
         @Override
         public void onStartSigning() {
             //Event triggered when the pad is touched
         }
      
        @Override
        public void onSigned() {
            //Event triggered when the pad is signed
        }
      
        @Override
        public void onClear() {
            //Event triggered when the pad is cleared
        }
     });

**Get Data**

**获取数据**

You can get signature data by following methods.

您可以通过以下方法获取签名数据。

*  **getSignatureBitmap()** – Gets signature bitmap with a white background.
    
    **getSignatureBitmap()** –获取带有白色背景的签名位图。
 *  **getTransparentSignatureBitmap()** – Gets signature bitmap with a transparent background.
    
    **getTransparentSignatureBitmap()** –获取具有透明背景的签名位图。
 *  **getSignatureSvg()** – Gets signature Scalable Vector Graphics document.
    
    **getSignatureSvg()** –获取签名可缩放矢量图形文档。

For clearing the signature pad area use **clear()** method.

要清除签名板区域，请使用**clear()**方法。

In below example I have just captured the signature and not saved it anywhere. You can get signature data using above methods and then save anywhere like in database or server.

在下面的示例中，我刚刚捕获了签名，并且没有将其保存在任何地方。 您可以使用上述方法获取签名数据，然后将其保存在数据库或服务器中的任何位置。

### Android专案 **(**Android Project**)** ###

First create an android project with package name **com.signaturecapture **or you can use your existing project.

首先创建一个名为**com.signaturecapture**的android项目，或者您可以使用现有项目。

Now we have to add the Signature Pad library to our project. Add following line in your app level build.gradle file under dependencies section and then sync the project.

现在，我们必须将Signature Pad库添加到我们的项目中。 在依赖级别部分的应用程序级别build.gradle文件中添加以下行，然后同步项目。

compile 'com.github.gcacace:signature-pad:1.2.1'

Add following code in respective files.

在相应的文件中添加以下代码。

**activity\_main.xml**

<?xml version="1.0" encoding="utf-8"?>
     <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
         xmlns:tools="http://schemas.android.com/tools"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
         android:paddingBottom="@dimen/activity_vertical_margin"
         android:paddingLeft="@dimen/activity_horizontal_margin"
         android:paddingRight="@dimen/activity_horizontal_margin"
         android:paddingTop="@dimen/activity_vertical_margin"
         tools:context="com.signaturecapture.MainActivity"
         android:orientation="vertical">
      
         <com.github.gcacace.signaturepad.views.SignaturePad
             android:layout_width="match_parent"
             android:layout_height="200dp"
             android:id="@+id/signaturePad"/>
      
         <LinearLayout
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:orientation="horizontal">
             <Button
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"
                 android:id="@+id/saveButton"
                 android:text="Save"
                 android:layout_weight="1"/>
      
             <Button
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"
                 android:id="@+id/clearButton"
                 android:text="Clear"
                 android:layout_weight="1"/>
         </LinearLayout>
      
     </LinearLayout>

**MainActivity.java**

package com.signaturecapture;
      
     import android.content.pm.ActivityInfo;
     import android.support.v7.app.AppCompatActivity;
     import android.os.Bundle;
     import android.view.View;
     import android.widget.Button;
     import android.widget.Toast;
      
     import com.github.gcacace.signaturepad.views.SignaturePad;
      
     public class MainActivity extends AppCompatActivity {
         SignaturePad signaturePad;
         Button saveButton, clearButton;
      
         @Override
         protected void onCreate(Bundle savedInstanceState) {
             super.onCreate(savedInstanceState);
             setContentView(R.layout.activity_main);
      
             signaturePad = (SignaturePad)findViewById(R.id.signaturePad);
             saveButton = (Button)findViewById(R.id.saveButton);
             clearButton = (Button)findViewById(R.id.clearButton);
      
             //disable both buttons at start
             saveButton.setEnabled(false);
             clearButton.setEnabled(false);
      
             //change screen orientation to landscape mode
             setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
      
             signaturePad.setOnSignedListener(new SignaturePad.OnSignedListener() {
                 @Override
                 public void onStartSigning() {
      
                 }
      
                 @Override
                 public void onSigned() {
                     saveButton.setEnabled(true);
                     clearButton.setEnabled(true);
                 }
      
                 @Override
                 public void onClear() {
                     saveButton.setEnabled(false);
                     clearButton.setEnabled(false);
                 }
             });
      
             saveButton.setOnClickListener(new View.OnClickListener() {
                 @Override
                 public void onClick(View v) {
                     //write code for saving the signature here
                     Toast.makeText(MainActivity.this, "Signature Saved", Toast.LENGTH_SHORT).show();
                 }
             });
      
             clearButton.setOnClickListener(new View.OnClickListener() {
                 @Override
                 public void onClick(View v) {
                     signaturePad.clear();
                 }
             });
         }
     }

Save and run your project.

保存并运行您的项目。

**Screenshot**

**屏幕截图**

![使用签名板库的Android签名捕获示例][Android]

Comment below if you have any queries related to above android signature capture example.

如果您有任何与上述android签名捕获示例相关的查询，请在下面评论。

> 翻译自: [https://www.thecrazyprogrammer.com/2017/02/android-signature-capture-example.html][https_www.thecrazyprogrammer.com_2017_02_android-signature-capture-example.html]

android 签名板

[8c5a3882e5f817af075e4bea8ffd2edc.png]: /images/20221123/140e329612054419b8609ac1a0972f93.png
[Android]: /images/20221123/8e306ee5427142f1bd983ef79dafd47c.png
[https_www.thecrazyprogrammer.com_2017_02_android-signature-capture-example.html]: https://www.thecrazyprogrammer.com/2017/02/android-signature-capture-example.html