How to capture human signature [closed]

Your question is a little too broad. Try asking a question about a specific problem, not "how do I do something general". See the FAQ for more information about how to ask a question.

Here is a vague idea though:

1. You'll want to have a canvas object that can allow the user to draw to the screen. Here is a link on SO about it. Android drawing a line to follow your finger

2. Then you'll want to output that bitmap as a file: Save bitmap to location

You can do this in two ways:

1. Your own Implementation

You can use canvas to draw signatures. Use paint object to set signature stroke size & color.

2. Simply use library

See SignatureView library. It will do all, what you want.

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

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

https://demonuts.com/android-capture-digital-signature/

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"/>