ImageAdapter.java

package com.ljp.laucher.path;

import android.app.Activity;
import android.content.Context;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.Canvas;
import android.graphics.LinearGradient;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.PorterDuffXfermode;
import android.graphics.Shader.TileMode;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.ImageView;

import com.ljp.laucher.util.Configure;
import com.ljp.laucher.util.ImageOperation;

public class ImageAdapter extends BaseAdapter {
	private Context mContext;
	private Integer[] mImageIds;

	public ImageAdapter(Context c, Integer[] ImageIds) {
		mContext = c;
		mImageIds = ImageIds;
	}

	public Bitmap createReflectedImages(int id) {

		final int reflectionGap = 4;
		Bitmap originalImage = ImageOperation.readNoImageBitmap(mContext, id);
		int width = originalImage.getWidth();
		int height = originalImage.getHeight();
		Matrix matrix = new Matrix();

		matrix.preScale(1, -1);

		Bitmap reflectionImage = Bitmap.createBitmap(originalImage, 0,
				height / 2, width, height / 2, matrix, false);

		Bitmap bitmapWithReflection = Bitmap.createBitmap(width,
				(height + height / 2), Config.ARGB_8888);

		Canvas canvas = new Canvas(bitmapWithReflection);
		canvas.drawBitmap(originalImage, 0, 0, null);

		Paint deafaultPaint = new Paint();
		deafaultPaint.setAntiAlias(false);
		canvas.drawBitmap(reflectionImage, 0, height + reflectionGap, null);
		Paint paint = new Paint();
		paint.setAntiAlias(false);

		LinearGradient shader = new LinearGradient(0,
				originalImage.getHeight(), 0, bitmapWithReflection.getHeight()
						+ reflectionGap, 0x70ffffff, 0x00ffffff,
				TileMode.MIRROR);
		paint.setShader(shader);
		paint.setXfermode(new PorterDuffXfermode(
				android.graphics.PorterDuff.Mode.DST_IN));

		canvas.drawRect(0, height, width, bitmapWithReflection.getHeight()
				+ reflectionGap, paint);

		return bitmapWithReflection;
	}

	@SuppressWarnings("unused")
	private Resources getResources() {
		return null;
	}

	public int getCount() {
		return mImageIds.length;
	}

	public Object getItem(int position) {
		return position;
	}

	public long getItemId(int position) {
		return position;
	}

	public View getView(int position, View convertView, ViewGroup parent) {
		ImageView iv = new ImageView(mContext);
		iv.setScaleType(ImageView.ScaleType.CENTER_INSIDE);
		iv.setLayoutParams(new Gallery.LayoutParams(Configure.getScreenWidth((Activity) mContext)/2,
				Configure.getScreenHeight((Activity) mContext)/2));
		iv.setImageBitmap(createReflectedImages(mImageIds[position]));
		return iv;
	}

	public float getScale(boolean focused, int offset) {
		return Math.max(0, 1.0f / (float) Math.pow(2, Math.abs(offset)));
	}
}