├── .gitignore ├── LICENSE ├── README.md ├── SignaturePad-Example ├── build.gradle ├── ic_launcher-web.png ├── proguard-rules.pro └── src │ └── main │ ├── AndroidManifest.xml │ ├── java │ └── com │ │ └── github │ │ └── gcacace │ │ └── signaturepad │ │ └── MainActivity.java │ └── res │ ├── drawable-hdpi │ └── ic_launcher.png │ ├── drawable-mdpi │ └── ic_launcher.png │ ├── drawable-xhdpi │ └── ic_launcher.png │ ├── drawable-xxhdpi │ └── ic_launcher.png │ ├── layout │ └── activity_main.xml │ ├── values-sw600dp │ └── dimens.xml │ ├── values-sw720dp-land │ └── dimens.xml │ └── values │ ├── dimens.xml │ ├── strings.xml │ └── styles.xml ├── build.gradle ├── gradle.properties ├── gradle └── wrapper │ ├── gradle-wrapper.jar │ └── gradle-wrapper.properties ├── gradlew ├── gradlew.bat ├── header.png ├── settings.gradle └── signature-pad ├── build.gradle ├── proguard-rules-consumer.pro ├── proguard-rules.pro └── src └── main ├── AndroidManifest.xml ├── java └── com │ └── github │ └── gcacace │ └── signaturepad │ ├── utils │ ├── Bezier.java │ ├── ControlTimedPoints.java │ ├── SignaturePadBindingAdapter.java │ ├── SvgBuilder.java │ ├── SvgPathBuilder.java │ ├── SvgPoint.java │ └── TimedPoint.java │ ├── view │ ├── ViewCompat.java │ └── ViewTreeObserverCompat.java │ └── views │ └── SignaturePad.java └── res └── values └── attrs.xml /.gitignore: -------------------------------------------------------------------------------- 1 | # Gradle files 2 | .gradle/ 3 | build/ 4 | 5 | # Local configuration file (sdk path, etc) 6 | local.properties 7 | 8 | # Android Studio generated folders 9 | .navigation/ 10 | captures/ 11 | .externalNativeBuild 12 | 13 | # IntelliJ project files 14 | *.iml 15 | .idea/ 16 | 17 | # Misc 18 | .DS_Store 19 | 20 | # Keystore files 21 | *.jks 22 | 23 | # Release/publishing credentials 24 | bintray.properties 25 | release.properties 26 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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We also recommend that a 185 | file or class name and description of purpose be included on the 186 | same "printed page" as the copyright notice for easier 187 | identification within third-party archives. 188 | 189 | Copyright {yyyy} {name of copyright owner} 190 | 191 | Licensed under the Apache License, Version 2.0 (the "License"); 192 | you may not use this file except in compliance with the License. 193 | You may obtain a copy of the License at 194 | 195 | http://www.apache.org/licenses/LICENSE-2.0 196 | 197 | Unless required by applicable law or agreed to in writing, software 198 | distributed under the License is distributed on an "AS IS" BASIS, 199 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 200 | See the License for the specific language governing permissions and 201 | limitations under the License. 202 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | Android Signature Pad 2 | ==================== 3 | 4 | Android Signature Pad is an Android library for drawing smooth signatures. It uses variable width Bézier curve interpolation based on [Smoother Signatures](http://corner.squareup.com/2012/07/smoother-signatures.html) post by [Square](https://squareup.com). 5 | 6 | ![Screenshot](https://github.com/gcacace/android-signaturepad/raw/master/header.png) 7 | 8 | ## Features 9 | * Bézier implementation for a smoother line 10 | * Variable point size based on velocity 11 | * Customizable pen color and size 12 | * Bitmap and SVG support 13 | * Data Binding 14 | 15 | ## Installation 16 | 17 | Latest version of the library can be found on Maven Central. 18 | 19 | ### For Gradle users 20 | 21 | Open your `build.gradle` and make sure that Maven Central repository is declared into `repositories` section: 22 | ```gradle 23 | repositories { 24 | mavenCentral() 25 | } 26 | ``` 27 | Then, include the library as dependency: 28 | ```gradle 29 | compile 'com.github.gcacace:signature-pad:1.3.1' 30 | ``` 31 | 32 | ### For Maven users 33 | 34 | Add this dependency to your `pom.xml`: 35 | ```xml 36 | 37 | com.github.gcacace 38 | signature-pad 39 | 1.3.1 40 | aar 41 | 42 | ``` 43 | 44 | ## Usage 45 | 46 | *Please see the `/SignaturePad-Example` app for a more detailed code example of how to use the library.* 47 | 48 | 1. Add the `SignaturePad` view to the layout you want to show. 49 | ```xml 50 | 58 | ``` 59 | 60 | 2. Configure attributes. 61 | * `penMinWidth` - The minimum width of the stroke (default: 3dp). 62 | * `penMaxWidth` - The maximum width of the stroke (default: 7dp). 63 | * `penColor` - The color of the stroke (default: Color.BLACK). 64 | * `velocityFilterWeight` - Weight used to modify new velocity based on the previous velocity (default: 0.9). 65 | * `clearOnDoubleClick` - Double click to clear pad (default: false) 66 | 67 | 3. Configure signature events listener 68 | 69 | An `OnSignedListener` can be set on the view: 70 | ```java 71 | 72 | mSignaturePad = (SignaturePad) findViewById(R.id.signature_pad); 73 | mSignaturePad.setOnSignedListener(new SignaturePad.OnSignedListener() { 74 | 75 | @Override 76 | public void onStartSigning() { 77 | //Event triggered when the pad is touched 78 | } 79 | 80 | @Override 81 | public void onSigned() { 82 | //Event triggered when the pad is signed 83 | } 84 | 85 | @Override 86 | public void onClear() { 87 | //Event triggered when the pad is cleared 88 | } 89 | }); 90 | ``` 91 | 92 | 4. Get signature data 93 | * `getSignatureBitmap()` - A signature bitmap with a white background. 94 | * `getTransparentSignatureBitmap()` - A signature bitmap with a transparent background. 95 | * `getSignatureSvg()` - A signature Scalable Vector Graphics document. 96 | 97 | ## Data Binding 98 | 99 | The `SignaturePad` view has custom Data Binding attribute setters for all the listener events: 100 | 101 | ```xml 102 | 111 | ``` 112 | 113 | ## Cordova Plugin 114 | 115 | Thanks to [netinhoteixeira](https://github.com/netinhoteixeira/), there is a Cordova plugin using that library. 116 | Please refer to https://github.com/netinhoteixeira/cordova-plugin-signature-view. 117 | 118 | ## NativeScript Plugin 119 | Thanks to [bradmartin](https://github.com/bradmartin), there is a NativeScript plugin. 120 | Please refer to [https://github.com/bradmartin/nativescript-signaturepad](https://github.com/bradmartin/nativescript-signaturepad). 121 | 122 | ## Caveats 123 | 124 | Currently doesn't support screen rotations. Pull requests are welcome! 125 | 126 | ## License 127 | 128 | Copyright 2014-2016 Gianluca Cacace 129 | 130 | Licensed under the Apache License, Version 2.0 (the "License"); 131 | you may not use this file except in compliance with the License. 132 | You may obtain a copy of the License at 133 | 134 | http://www.apache.org/licenses/LICENSE-2.0 135 | 136 | Unless required by applicable law or agreed to in writing, software 137 | distributed under the License is distributed on an "AS IS" BASIS, 138 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 139 | See the License for the specific language governing permissions and 140 | limitations under the License. 141 | -------------------------------------------------------------------------------- /SignaturePad-Example/build.gradle: -------------------------------------------------------------------------------- 1 | apply plugin: 'com.android.application' 2 | 3 | android { 4 | compileSdkVersion Integer.parseInt(project.ANDROID_BUILD_SDK_VERSION) 5 | 6 | defaultConfig { 7 | minSdkVersion 14 8 | targetSdkVersion Integer.parseInt(project.ANDROID_BUILD_TARGET_SDK_VERSION) 9 | versionName project.VERSION_NAME 10 | versionCode Integer.parseInt(project.VERSION_CODE) 11 | } 12 | 13 | signingConfigs { release } 14 | 15 | buildTypes { 16 | release { 17 | minifyEnabled false 18 | } 19 | } 20 | } 21 | 22 | dependencies { 23 | implementation project(":signature-pad") 24 | implementation 'androidx.appcompat:appcompat:1.0.0' 25 | } 26 | -------------------------------------------------------------------------------- /SignaturePad-Example/ic_launcher-web.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/gcacace/android-signaturepad/89d35965ad408bd3b3bfc96aa30cbc51d6dbd863/SignaturePad-Example/ic_launcher-web.png -------------------------------------------------------------------------------- /SignaturePad-Example/proguard-rules.pro: -------------------------------------------------------------------------------- 1 | # Add project specific ProGuard rules here. 2 | # By default, the flags in this file are appended to flags specified 3 | # in ${sdk.dir}/tools/proguard/proguard-android.txt 4 | # You can edit the include path and order by changing the proguardFiles 5 | # directive in build.gradle. 6 | # 7 | # For more details, see 8 | # http://developer.android.com/guide/developing/tools/proguard.html 9 | 10 | # Add any project specific keep options here: 11 | 12 | # If your project uses WebView with JS, uncomment the following 13 | # and specify the fully qualified class name to the JavaScript interface 14 | # class: 15 | #-keepclassmembers class fqcn.of.javascript.interface.for.webview { 16 | # public *; 17 | #} 18 | 19 | # Uncomment this to preserve the line number information for 20 | # debugging stack traces. 21 | #-keepattributes SourceFile,LineNumberTable 22 | 23 | # If you keep the line number information, uncomment this to 24 | # hide the original source file name. 25 | #-renamesourcefileattribute SourceFile 26 | -------------------------------------------------------------------------------- /SignaturePad-Example/src/main/AndroidManifest.xml: -------------------------------------------------------------------------------- 1 | 2 | 4 | 5 | 6 | 7 | 8 | 13 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | -------------------------------------------------------------------------------- /SignaturePad-Example/src/main/java/com/github/gcacace/signaturepad/MainActivity.java: -------------------------------------------------------------------------------- 1 | package com.github.gcacace.signaturepad; 2 | 3 | import android.Manifest; 4 | import android.app.Activity; 5 | import android.content.Intent; 6 | import android.content.pm.PackageManager; 7 | import android.graphics.Bitmap; 8 | import android.graphics.Canvas; 9 | import android.graphics.Color; 10 | import android.net.Uri; 11 | import android.os.Bundle; 12 | import android.os.Environment; 13 | import androidx.annotation.NonNull; 14 | import androidx.core.app.ActivityCompat; 15 | import android.util.Log; 16 | import android.view.View; 17 | import android.widget.Button; 18 | import android.widget.Toast; 19 | 20 | import com.github.gcacace.signaturepad.views.SignaturePad; 21 | 22 | import java.io.File; 23 | import java.io.FileOutputStream; 24 | import java.io.IOException; 25 | import java.io.OutputStream; 26 | import java.io.OutputStreamWriter; 27 | 28 | import it.gcacace.signaturepad.R; 29 | 30 | public class MainActivity extends Activity { 31 | 32 | private static final int REQUEST_EXTERNAL_STORAGE = 1; 33 | private static String[] PERMISSIONS_STORAGE = {Manifest.permission.WRITE_EXTERNAL_STORAGE}; 34 | private SignaturePad mSignaturePad; 35 | private Button mClearButton; 36 | private Button mSaveButton; 37 | 38 | @Override 39 | protected void onCreate(Bundle savedInstanceState) { 40 | super.onCreate(savedInstanceState); 41 | verifyStoragePermissions(this); 42 | setContentView(R.layout.activity_main); 43 | 44 | mSignaturePad = (SignaturePad) findViewById(R.id.signature_pad); 45 | mSignaturePad.setOnSignedListener(new SignaturePad.OnSignedListener() { 46 | @Override 47 | public void onStartSigning() { 48 | Toast.makeText(MainActivity.this, "OnStartSigning", Toast.LENGTH_SHORT).show(); 49 | } 50 | 51 | @Override 52 | public void onSigned() { 53 | mSaveButton.setEnabled(true); 54 | mClearButton.setEnabled(true); 55 | } 56 | 57 | @Override 58 | public void onClear() { 59 | mSaveButton.setEnabled(false); 60 | mClearButton.setEnabled(false); 61 | } 62 | }); 63 | 64 | mClearButton = (Button) findViewById(R.id.clear_button); 65 | mSaveButton = (Button) findViewById(R.id.save_button); 66 | 67 | mClearButton.setOnClickListener(new View.OnClickListener() { 68 | @Override 69 | public void onClick(View view) { 70 | mSignaturePad.clear(); 71 | } 72 | }); 73 | 74 | mSaveButton.setOnClickListener(new View.OnClickListener() { 75 | @Override 76 | public void onClick(View view) { 77 | Bitmap signatureBitmap = mSignaturePad.getSignatureBitmap(); 78 | if (addJpgSignatureToGallery(signatureBitmap)) { 79 | Toast.makeText(MainActivity.this, "Signature saved into the Gallery", Toast.LENGTH_SHORT).show(); 80 | } else { 81 | Toast.makeText(MainActivity.this, "Unable to store the signature", Toast.LENGTH_SHORT).show(); 82 | } 83 | if (addSvgSignatureToGallery(mSignaturePad.getSignatureSvg())) { 84 | Toast.makeText(MainActivity.this, "SVG Signature saved into the Gallery", Toast.LENGTH_SHORT).show(); 85 | } else { 86 | Toast.makeText(MainActivity.this, "Unable to store the SVG signature", Toast.LENGTH_SHORT).show(); 87 | } 88 | } 89 | }); 90 | } 91 | 92 | @Override 93 | public void onRequestPermissionsResult(int requestCode, 94 | @NonNull String permissions[], @NonNull int[] grantResults) { 95 | switch (requestCode) { 96 | case REQUEST_EXTERNAL_STORAGE: { 97 | // If request is cancelled, the result arrays are empty. 98 | if (grantResults.length <= 0 99 | || grantResults[0] != PackageManager.PERMISSION_GRANTED) { 100 | Toast.makeText(MainActivity.this, "Cannot write images to external storage", Toast.LENGTH_SHORT).show(); 101 | } 102 | } 103 | } 104 | } 105 | 106 | public File getAlbumStorageDir(String albumName) { 107 | // Get the directory for the user's public pictures directory. 108 | File file = new File(Environment.getExternalStoragePublicDirectory( 109 | Environment.DIRECTORY_PICTURES), albumName); 110 | if (!file.mkdirs()) { 111 | Log.e("SignaturePad", "Directory not created"); 112 | } 113 | return file; 114 | } 115 | 116 | public void saveBitmapToJPG(Bitmap bitmap, File photo) throws IOException { 117 | Bitmap newBitmap = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Bitmap.Config.ARGB_8888); 118 | Canvas canvas = new Canvas(newBitmap); 119 | canvas.drawColor(Color.WHITE); 120 | canvas.drawBitmap(bitmap, 0, 0, null); 121 | OutputStream stream = new FileOutputStream(photo); 122 | newBitmap.compress(Bitmap.CompressFormat.JPEG, 80, stream); 123 | stream.close(); 124 | } 125 | 126 | public boolean addJpgSignatureToGallery(Bitmap signature) { 127 | boolean result = false; 128 | try { 129 | File photo = new File(getAlbumStorageDir("SignaturePad"), String.format("Signature_%d.jpg", System.currentTimeMillis())); 130 | saveBitmapToJPG(signature, photo); 131 | scanMediaFile(photo); 132 | result = true; 133 | } catch (IOException e) { 134 | e.printStackTrace(); 135 | } 136 | return result; 137 | } 138 | 139 | private void scanMediaFile(File photo) { 140 | Intent mediaScanIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE); 141 | Uri contentUri = Uri.fromFile(photo); 142 | mediaScanIntent.setData(contentUri); 143 | MainActivity.this.sendBroadcast(mediaScanIntent); 144 | } 145 | 146 | public boolean addSvgSignatureToGallery(String signatureSvg) { 147 | boolean result = false; 148 | try { 149 | File svgFile = new File(getAlbumStorageDir("SignaturePad"), String.format("Signature_%d.svg", System.currentTimeMillis())); 150 | OutputStream stream = new FileOutputStream(svgFile); 151 | OutputStreamWriter writer = new OutputStreamWriter(stream); 152 | writer.write(signatureSvg); 153 | writer.close(); 154 | stream.flush(); 155 | stream.close(); 156 | scanMediaFile(svgFile); 157 | result = true; 158 | } catch (IOException e) { 159 | e.printStackTrace(); 160 | } 161 | return result; 162 | } 163 | 164 | /** 165 | * Checks if the app has permission to write to device storage 166 | *

167 | * If the app does not has permission then the user will be prompted to grant permissions 168 | * 169 | * @param activity the activity from which permissions are checked 170 | */ 171 | public static void verifyStoragePermissions(Activity activity) { 172 | // Check if we have write permission 173 | int permission = ActivityCompat.checkSelfPermission(activity, Manifest.permission.WRITE_EXTERNAL_STORAGE); 174 | 175 | if (permission != PackageManager.PERMISSION_GRANTED) { 176 | // We don't have permission so prompt the user 177 | ActivityCompat.requestPermissions( 178 | activity, 179 | PERMISSIONS_STORAGE, 180 | REQUEST_EXTERNAL_STORAGE 181 | ); 182 | } 183 | } 184 | } 185 | -------------------------------------------------------------------------------- /SignaturePad-Example/src/main/res/drawable-hdpi/ic_launcher.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/gcacace/android-signaturepad/89d35965ad408bd3b3bfc96aa30cbc51d6dbd863/SignaturePad-Example/src/main/res/drawable-hdpi/ic_launcher.png -------------------------------------------------------------------------------- /SignaturePad-Example/src/main/res/drawable-mdpi/ic_launcher.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/gcacace/android-signaturepad/89d35965ad408bd3b3bfc96aa30cbc51d6dbd863/SignaturePad-Example/src/main/res/drawable-mdpi/ic_launcher.png -------------------------------------------------------------------------------- /SignaturePad-Example/src/main/res/drawable-xhdpi/ic_launcher.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/gcacace/android-signaturepad/89d35965ad408bd3b3bfc96aa30cbc51d6dbd863/SignaturePad-Example/src/main/res/drawable-xhdpi/ic_launcher.png -------------------------------------------------------------------------------- /SignaturePad-Example/src/main/res/drawable-xxhdpi/ic_launcher.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/gcacace/android-signaturepad/89d35965ad408bd3b3bfc96aa30cbc51d6dbd863/SignaturePad-Example/src/main/res/drawable-xxhdpi/ic_launcher.png -------------------------------------------------------------------------------- /SignaturePad-Example/src/main/res/layout/activity_main.xml: -------------------------------------------------------------------------------- 1 | 11 | 12 | 13 | 18 | 19 | 25 | 26 | 35 | 36 | 40 | 41 | 42 | 49 | 50 |