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Question:

I am new to Android. I am developing an application that requires a user signature. How can I capture a signature in Android?


Best Answer:


Here's how I have capture human signature and save image using this library:

https://github.com/zahid-ali-shah/SignatureView

First add following to your gradle:

 repositories {
        jcenter()
  }
  repositories {
      maven {
          url 'https://dl.bintray.com/zahid/maven/'
      }
  }
  dependencies {
      compile 'com.kyanogen.signatureview:signature-view:1.0'
  }

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:orientation="vertical"
    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.example.parsaniahardik.signaturedemo.MainActivity">
    <com.kyanogen.signatureview.SignatureView
        xmlns:sign="http://schemas.android.com/apk/res-auto"
        android:id="@+id/signature_view"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        sign:penSize="5dp"
        sign:backgroundColor="#ffffff"
        sign:penColor="#000000"
        sign:enableSignature="true"/>
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/clear"
        android:text="clear"/>
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/save"
        android:text="save"/>
</LinearLayout>

MainActivity.java:

package com.example.parsaniahardik.signaturedemo;
import android.graphics.Bitmap;
import android.media.MediaScannerConnection;
import android.os.Environment;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import com.kyanogen.signatureview.SignatureView;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Calendar;
public class MainActivity extends AppCompatActivity {
    Bitmap bitmap;
    Button clear,save;
    SignatureView signatureView;
    String path;
    private static final String IMAGE_DIRECTORY = "/signdemo";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        signatureView =  (SignatureView) findViewById(R.id.signature_view);
        clear = (Button) findViewById(R.id.clear);
        save = (Button) findViewById(R.id.save);
        clear.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                signatureView.clearCanvas();
            }
        });
        save.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                bitmap = signatureView.getSignatureBitmap();
                path = saveImage(bitmap);
            }
        });
    }
    public String saveImage(Bitmap myBitmap) {
        ByteArrayOutputStream bytes = new ByteArrayOutputStream();
        myBitmap.compress(Bitmap.CompressFormat.JPEG, 90, bytes);
        File wallpaperDirectory = new File(
                Environment.getExternalStorageDirectory() + IMAGE_DIRECTORY /*iDyme folder*/);
        // have the object build the directory structure, if needed.
        if (!wallpaperDirectory.exists()) {
            wallpaperDirectory.mkdirs();
            Log.d("hhhhh",wallpaperDirectory.toString());
        }
        try {
            File f = new File(wallpaperDirectory, Calendar.getInstance()
                    .getTimeInMillis() + ".jpg");
            f.createNewFile();
            FileOutputStream fo = new FileOutputStream(f);
            fo.write(bytes.toByteArray());
            MediaScannerConnection.scanFile(MainActivity.this,
                    new String[]{f.getPath()},
                    new String[]{"image/jpeg"}, null);
            fo.close();
            Log.d("TAG", "File Saved::--->" + f.getAbsolutePath());
            return f.getAbsolutePath();
        } catch (IOException e1) {
            e1.printStackTrace();
        }
        return "";
    }
}

Don't forget to give READ-WRITE permission in manifest.xml

 <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
 <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>



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