Android Face Detection Example

In Android Sdk provide rich class called android.media.FaceDetector to identify the faces of people in a Bitmap graphic object.
In this below example we can see using FaceDetector how i find any people faces in Bitmap image .

Here below class i am using FaceDetector i can apply one rectangle shape to face.

Here i am using one image(aishwarya.png) that can be converted into Bitmap image
and Apply FaceDetection view on Image.and set that image to Activity View.

Note: Dont forget to place (aishwarya.png) in drawable folder.you can use your own image insted of (aishwarya.png) no problem .but u should you should use (yourpngfilename.png) insted of (aishwarya.png) in the below code

Android Activity(FaceDetectorActivity.java)

package com.androidsurya.facemodule;

import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.PointF;
import android.media.FaceDetector;
import android.media.FaceDetector.Face;
import android.os.Bundle;
import android.view.View;

public class FaceDetectorActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(new faceView(this));
}

private class faceView extends View {
// numberOfFace is for how many faces you want to find
private int numberOfFace = 1;
private FaceDetector faceDectect;
private FaceDetector.Face[] faceObj;
float eyesDistance;
int numberOfFacesDetected;
Bitmap bitmapImag;

public faceView(Context context) {
super(context);
// TODO Auto-generated constructor stub

BitmapFactory.Options BitmapFactoryOptionsbfo = new BitmapFactory.Options();
BitmapFactoryOptionsbfo.inPreferredConfig = Bitmap.Config.RGB_565;
bitmapImag = BitmapFactory.decodeResource(getResources(),
R.drawable.aishwarya, BitmapFactoryOptionsbfo);
faceObj = new FaceDetector.Face[numberOfFace];
faceDectect = new FaceDetector(bitmapImag.getWidth(),
bitmapImag.getHeight(), numberOfFace);
numberOfFacesDetected = faceDectect.findFaces(bitmapImag, faceObj);

}

@Override
protected void onDraw(Canvas canvas) {
// TODO Auto-generated method stub

canvas.drawBitmap(bitmapImag, 0, 0, null);

Paint myPaint = new Paint();
myPaint.setColor(Color.YELLOW);
myPaint.setStyle(Paint.Style.STROKE);
myPaint.setStrokeWidth(2);

for (int i = 0; i < numberOfFacesDetected; i++) {
Face face = faceObj[i];
PointF myMidPoint = new PointF();
face.getMidPoint(myMidPoint);
eyesDistance = face.eyesDistance();
canvas.drawRect((int) (myMidPoint.x - eyesDistance),
(int) (myMidPoint.y - eyesDistance),
(int) (myMidPoint.x + eyesDistance),
(int) (myMidPoint.y + eyesDistance), myPaint);
}
}
}
}

Register Android Activity in Android Manifest File

<activity
            android:name="com.androidsurya.facemodule.FaceDetectorActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

Output ScreenShot

Load Image From URL Android Example

Here you can show image from URL (web)
.
Here we are going to see about how to load the image from web using URL.

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.androidsurya.tutorial"
    android:versionCode="1"
    android:versionName="1.0" >
    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="16" />
    <uses-permission android:name="android.permission.INTERNET" />
    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.androidsurya.tutorial.LoadImageFromUrl"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
</manifest>

Write xml file(load_image_from_url.xml)

<RelativeLayout 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"
    tools:context=".LoadImageFromUrl" >
    <ImageView
        android:id="@+id/imageView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:src="@drawable/ic_launcher" />
</RelativeLayout>

Create Android Activity(LoadImageFromUrl.Class)

package com.androidsurya.tutorial;

import java.io.InputStream;
import java.net.URL;
import android.os.Bundle;
import android.app.Activity;
import android.graphics.drawable.Drawable;
import android.view.Menu;
import android.widget.ImageView;

public class LoadImageFromUrl extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.load_image_from_url);
        ImageView imgView = (ImageView) findViewById(R.id.imageView1);
        Drawable drawable = LoadImageFromURL("http://www.imagesup.net/dt-713727549903.png");
        imgView.setImageDrawable(drawable);

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.load_image_from_url, menu);
        return true;
    }

    private Drawable LoadImageFromURL(String url) {
        try {
            InputStream is = (InputStream) new URL(url).getContent();
            Drawable d = Drawable.createFromStream(is, "src name");
            return d;
        } catch (Exception e) {
            System.out.println("Excecption is=" + e);
            return null;
        }
    }

}

See the final output like this: