我尝试了两个图像框架Picasso和Glide来加载来自SD的图像并将其显示在 ReceyclerView 列表项 ImageView中即可。 ReceyclerView 列表包含大约50个项目以及更多。
每当我向下滚动列表时,滚动运动都不流畅,有时会开始出现口吃,这会使我认为的UX恶化。我只在片段内加载光盘(SD)中的图像。
Picasso 我使用了以下代码:
Picasso.with(activity.getApplicationContext())
.load(Constants.ABS_PATH_USER_IMAGE + user.getPicture() + ".jpg")
.tag(PicassoOnScrollListener.TAG)
.resize(100, 100)
.centerCrop()
.transform(new CircleTransform())
.placeholder(R.drawable.default_user)
.error(R.drawable.default_user)
.into(holder.thumbNail);
Picasso ScrollListener 如下所示:
public class PicassoOnScrollListener extends RecyclerView.OnScrollListener {
public static final Object TAG = new Object();
private static final int SETTLING_DELAY = 500;
private static Picasso sPicasso = null;
private Runnable mSettlingResumeRunnable = null;
public PicassoOnScrollListener(Context context) {
if(this.sPicasso == null) {
this.sPicasso = Picasso.with(context.getApplicationContext());
}
}
@Override
public void onScrollStateChanged(RecyclerView recyclerView, int scrollState) {
if(scrollState == RecyclerView.SCROLL_STATE_IDLE) {
recyclerView.removeCallbacks(mSettlingResumeRunnable);
sPicasso.resumeTag(TAG);
} else if(scrollState == RecyclerView.SCROLL_STATE_SETTLING) {
mSettlingResumeRunnable = new Runnable() {
@Override
public void run() {
sPicasso.resumeTag(TAG);
}
};
recyclerView.postDelayed(mSettlingResumeRunnable, SETTLING_DELAY);
} else {
sPicasso.pauseTag(TAG);
}
}}
要将 ScrollListener 添加到我做过以下的ReceyclerView:
myRecyclerView.addOnScrollListener(new PicassoOnScrollListener(getContext()));
对于 Glide ,我只使用了以下代码示例:
Glide
.with(mActivity.getApplicationContext())
.load(Constants.ABS_PATH_USER_IMAGE + author.getPicture() + ".jpg")
.centerCrop()
.placeholder(R.drawable.default_user)
.crossFade()
.diskCacheStrategy(DiskCacheStrategy.ALL)
.transform(new GlideCircleTransform(mActivity.getApplicationContext()))
.into(holder.thumbNailAuthor);
您对如何实现平滑滚动运动有什么想法吗?
答案 0 :(得分:1)
尝试使用
android:adjustViewBounds="true"
在布局中的imageView中
答案 1 :(得分:1)
尝试将此添加到您的RecyclerView:
recyclerView.setHasFixedSize(true);
recyclerView.setItemViewCacheSize(20);
recyclerView.setDrawingCacheEnabled(true);
除了我使用.Fit().Resize()和删除.CenterCrop()之外。现在它就像一个魅力。