EyeView.java

package com.seal.ui.views;

import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.os.Build;
import android.util.AttributeSet;
import android.widget.FrameLayout;

public class EyeView extends FrameLayout {

	private Paint paint;
	private Bitmap bitmap;

	public EyeView(Context context) {
		super(context);
		init();
	}

	public EyeView(Context context, AttributeSet attrs) {
		super(context, attrs);
		init();
	}

	public EyeView(Context context, AttributeSet attrs, int defStyle) {
		super(context, attrs, defStyle);
		init();
	}

	@SuppressLint("NewApi")
	private void init() {
		setDrawingCacheEnabled(true);
		if (Build.VERSION.SDK_INT >= 11) {
			setLayerType(LAYER_TYPE_SOFTWARE, null);
		}
		paint = new Paint(Paint.ANTI_ALIAS_FLAG);
	}

	@Override
	protected void dispatchDraw(Canvas canvas) {
		super.dispatchDraw(canvas);
		if (bitmap != null) {
			paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_IN));
			canvas.drawBitmap(bitmap, 0, 0, paint);
			paint.setXfermode(null);
		}
	}

	public void setRadius(int radius) {
		if (bitmap != null && !bitmap.isRecycled()) {
			bitmap.recycle();
		}
		bitmap = Bitmap.createBitmap(getWidth(), getHeight(), Bitmap.Config.ARGB_8888);
		Canvas canvas = new Canvas(bitmap);
		canvas.drawCircle(getWidth() / 2f, getHeight() / 2f, radius, paint);
		invalidate();
	}

}