我有一个RecyclerView与Cardviews.我想在这个CardView中滑动图像,就像在OLX应用程序中一样.这样做最好的方法是什么？
我想把看门人放在cardview里面.可以吗还是应该尝试别的东西？
我想把看门人放在cardview里面.可以吗还是应该尝试别的东西？
我用ViewPager做了,但看起来太慢了.这是查看器适配器的一部分.
@Override
public Object instantiateItem(ViewGroup collection,int position) {
LayoutInflater inflater = LayoutInflater.from(mContext);
ViewGroup layout = (ViewGroup) inflater.inflate(R.layout.viewpager_custom,collection,false);
collection.addView(layout);
ImageView image = (ImageView) layout.findViewById(R.id.viewPagerImageView);
image.setImageResource(mPics[position]);
return layout;
}
解决方法
你要走正确的路.
只需要加载压缩位图,而不是未压缩的位图.
您直接将位图资源设置为您的图像视图.使用像毕加索的图书馆
https://github.com/square/picasso/
或使用谷歌的官方来源有效地加载大型位图.
首先在您的活动中复制此方法：
public static int calculateInSampleSize(
BitmapFactory.Options options,int reqWidth,int reqHeight) {
// Raw height and width of image
final int height = options.outHeight;
final int width = options.outWidth;
int inSampleSize = 1;
if (height > reqHeight || width > reqWidth) {
final int halfHeight = height / 2;
final int halfWidth = width / 2;
// Calculate the largest inSampleSize value that is a power of 2 and keeps both
// height and width larger than the requested height and width.
while ((halfHeight / inSampleSize) > reqHeight
&& (halfWidth / inSampleSize) > reqWidth) {
inSampleSize *= 2;
}
}
return inSampleSize;
}
那么这个方法来解码位图：
public static Bitmap decodeSampledBitmapFromResource(Resources res,int resId,int reqHeight) {
// First decode with inJustDecodeBounds=true to check dimensions
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeResource(res,resId,options);
// Calculate inSampleSize
options.inSampleSize = calculateInSampleSize(options,reqWidth,reqHeight);
// Decode bitmap with inSampleSize set
options.inJustDecodeBounds = false;
return BitmapFactory.decodeResource(res,options);
}
然后加载你的位图像这样：
@Override
public Object instantiateItem(ViewGroup collection,false);
collection.addView(layout);
ImageView image = (ImageView) layout.findViewById(R.id.viewPagerImageView);
image.setImageBitmap(
decodeSampledBitmapFromResource(getResources(),R.id.myimage,reqwidth,reqheight));
return layout;
}
