src/com/savoirfairelinux/sflphone/adapters/ContactPictureLoader.java

package com.savoirfairelinux.sflphone.adapters;

import java.io.InputStream;

import android.content.ContentResolver;
import android.content.ContentUris;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.PorterDuff.Mode;
import android.graphics.PorterDuffXfermode;
import android.graphics.RectF;
import android.net.Uri;
import android.provider.ContactsContract;
import android.widget.ImageView;

import com.savoirfairelinux.sflphone.R;

public class ContactPictureLoader implements Runnable {
    private ImageView view;
    private long cid;
    private ContentResolver cr;
    private final String TAG = ContactPictureLoader.class.getSimpleName();

    public ContactPictureLoader(Context context, ImageView element, long contact_id) {
        cid = contact_id;
        cr = context.getContentResolver();
        view = element;
    }

    public static Bitmap loadContactPhoto(ContentResolver cr, long id) {
        Uri uri = ContentUris.withAppendedId(ContactsContract.Contacts.CONTENT_URI, id);
        InputStream input = ContactsContract.Contacts.openContactPhotoInputStream(cr, uri);
        if (input == null) {
            return null;
        }
        return BitmapFactory.decodeStream(input);
    }

    @Override
    public void run() {
        Bitmap photo_bmp = loadContactPhoto(cr, cid);

        if (photo_bmp == null) {
            photo_bmp = BitmapFactory.decodeResource(view.getResources(), R.drawable.ic_contact_picture);
        }

        int w = photo_bmp.getWidth(), h = photo_bmp.getHeight();
        if (w > h) {
            w = h;
        } else if (h > w) {
            h = w;
        }

        final Bitmap externalBMP = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);

        int radius = externalBMP.getWidth() / 2;
        Path path = new Path();

        path.addCircle(radius, radius, radius, Path.Direction.CW);
        Paint mPaintPath = new Paint(Paint.ANTI_ALIAS_FLAG);
        mPaintPath.setStyle(Paint.Style.FILL);
        mPaintPath.setAntiAlias(true);
        Bitmap circle = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
        Canvas circle_drawer = new Canvas(circle);
        circle_drawer.drawOval(new RectF(0, 0, w, h), mPaintPath);
        mPaintPath.setFilterBitmap(false);

        Canvas internalCanvas = new Canvas(externalBMP);
        internalCanvas.drawBitmap(photo_bmp, 0, 0, mPaintPath);
        mPaintPath.setXfermode(new PorterDuffXfermode(Mode.DST_IN));
        internalCanvas.drawBitmap(circle, 0, 0, mPaintPath);

        view.post(new Runnable() {
            @Override
            public void run() {
                view.setImageBitmap(externalBMP);
                view.invalidate();
            }
        });
    }
}