Android--Gallery实例

  次阅读 来源:互联网(转载协议) 2015-10-03 10:45 我要评论(0)

1)新建项目 Gallery04

2)导入图片

3)编写ImageAdapter

4)编写GalleryFlow

5)编写layout_gallery.xml

6)编写Gallery04Activity

import android.content.Context;

import android.content.res.Resources;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.graphics.Canvas;

import android.graphics.LinearGradient;

import android.graphics.Matrix;

import android.graphics.Paint;

import android.graphics.PorterDuffXfermode;

import android.graphics.Bitmap.Config;

import android.graphics.PorterDuff.Mode;

import android.graphics.Shader.TileMode;

import android.view.View;

import android.view.ViewGroup;

import android.widget.BaseAdapter;

import android.widget.ImageView;

import android.widget.ImageView.ScaleType;

public class ImageAdapter extends BaseAdapter {

int mGalleryItemBackground;

private Context mContext;

private Integer[] mImageIds;

private ImageView[] mImages;

public ImageAdapter(Context c, Integer[] ImageIds) {

mContext = c;

mImageIds = ImageIds;

mImages = new ImageView[mImageIds.length];

}

public boolean createReflectedImages() {

final int reflectionGap = 4;

int index = 0;

for (int imageId : mImageIds) {

Bitmap originalImage = BitmapFactory.decodeResource(mContext

.getResources(), imageId);

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();

canvas.drawRect(0, height, width, height + reflectionGap,

deafaultPaint);

canvas.drawBitmap(reflectionImage, 0, height + reflectionGap, null);

Paint paint = new Paint();

LinearGradient shader = new LinearGradient(0, originalImage

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