我有一个问题,当RecyclerView
有大量项目(比如2000)时,滚动真的很滞后。
如果有人帮助我改进它,我真的很感激。提前谢谢。
编辑:使用此FastScroll库时可能会导致延迟。如果有人能够做一些拉动请求来改进它,我相信开发人员会非常感激。 https://github.com/plusCubed/recycler-fast-scroll
这是片段代码:
package jahirfiquitiva.apps.iconshowcase.fragments;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.InflateException;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import com.pluscubed.recyclerfastscroll.RecyclerFastScroller;
import java.util.ArrayList;
import java.util.Locale;
import jahirfiquitiva.apps.iconshowcase.R;
import jahirfiquitiva.apps.iconshowcase.adapters.IconsAdapter;
import jahirfiquitiva.apps.iconshowcase.utilities.Preferences;
import jp.wasabeef.recyclerview.adapters.AlphaInAnimationAdapter;
import jp.wasabeef.recyclerview.adapters.ScaleInAnimationAdapter;
public class IconsFragment extends Fragment {
private IconsAdapter mAdapter;
private Preferences mPrefs;
private ArrayList<String> iconsNames, filteredIconsList;
private ArrayList<Integer> iconsInts, filteredIconsInts;
private ViewGroup layout;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
mPrefs = new Preferences(getActivity());
if (layout != null) {
ViewGroup parent = (ViewGroup) layout.getParent();
if (parent != null) {
parent.removeView(layout);
}
}
try {
layout = (ViewGroup) inflater.inflate(R.layout.icons_grid, container, false);
} catch (InflateException e) {
}
RecyclerFastScroller fastScroller =
(RecyclerFastScroller) layout.findViewById(R.id.rvFastScroller);
fastScroller.setVisibility(View.GONE);
RecyclerView iconsGrid = (RecyclerView) layout.findViewById(R.id.iconsGrid);
iconsGrid.setHasFixedSize(true);
iconsGrid.setLayoutManager(new GridLayoutManager(getActivity(),
getResources().getInteger(R.integer.icon_grid_width)));
mAdapter = new IconsAdapter(getActivity(), new ArrayList<String>(), new ArrayList<Integer>());
if (getArguments() != null) {
iconsNames = getArguments().getStringArrayList("iconsNamesList");
iconsInts = getArguments().getIntegerArrayList("iconsArray");
mAdapter.setIcons(iconsNames, iconsInts);
}
iconsGrid.setAdapter(mPrefs.getAnimationsEnabled() ? animAdapter(mAdapter) : mAdapter);
fastScroller.setRecyclerView(iconsGrid);
fastScroller.setHideDelay(500);
fastScroller.setVisibility(View.VISIBLE);
return layout;
}
public static IconsFragment newInstance(ArrayList<String> iconsNames, ArrayList<Integer> iconsArray) {
IconsFragment fragment = new IconsFragment();
Bundle args = new Bundle();
args.putStringArrayList("iconsNamesList", iconsNames);
args.putIntegerArrayList("iconsArray", iconsArray);
fragment.setArguments(args);
return fragment;
}
public void performSearch(String query) {
filter(query, mAdapter);
}
private synchronized void filter(CharSequence s, IconsAdapter adapter) {
if (s == null || s.toString().trim().isEmpty()) {
if (filteredIconsList != null) {
filteredIconsList = null;
}
if (filteredIconsInts != null) {
filteredIconsList = null;
}
adapter.clearIconsList();
adapter.setIcons(iconsNames, iconsInts);
adapter.notifyDataSetChanged();
} else {
if (filteredIconsList != null) {
filteredIconsList.clear();
}
if (filteredIconsInts != null) {
filteredIconsList = null;
}
filteredIconsList = new ArrayList<String>();
filteredIconsInts = new ArrayList<Integer>();
for (int i = 0; i < iconsNames.size(); i++) {
String name = iconsNames.get(i);
if (name.toLowerCase(Locale.getDefault())
.startsWith(s.toString().toLowerCase(Locale.getDefault()))) {
filteredIconsList.add(iconsNames.get(i));
filteredIconsInts.add(iconsInts.get(i));
}
}
adapter.clearIconsList();
adapter.setIcons(filteredIconsList, filteredIconsInts);
adapter.notifyDataSetChanged();
}
}
private ScaleInAnimationAdapter animAdapter(IconsAdapter iconsAdapter) {
AlphaInAnimationAdapter alphaAdapter = new AlphaInAnimationAdapter(iconsAdapter);
ScaleInAnimationAdapter scaleAdapter = new ScaleInAnimationAdapter(alphaAdapter);
scaleAdapter.setFirstOnly(true);
return scaleAdapter;
}
}
和RecyclerView适配器:
package jahirfiquitiva.apps.iconshowcase.adapters;
import android.content.Context;
import android.content.res.Resources;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import com.afollestad.materialdialogs.MaterialDialog;
import java.util.ArrayList;
import java.util.Locale;
import jahirfiquitiva.apps.iconshowcase.R;
import jahirfiquitiva.apps.iconshowcase.utilities.Util;
public class IconsAdapter extends RecyclerView.Adapter<IconsAdapter.IconsHolder> implements View.OnClickListener {
private final Context context;
private ArrayList<String> iconsList = new ArrayList<>();
private ArrayList<Integer> iconsArray = new ArrayList<>();
public IconsAdapter(Context context, ArrayList<String> iconsList, ArrayList<Integer> iconsArray) {
this.context = context;
this.iconsList = iconsList;
this.iconsArray = iconsArray;
}
public void setIcons(ArrayList<String> iconsList, ArrayList<Integer> iconsArray) {
this.iconsList.addAll(iconsList);
this.iconsArray.addAll(iconsArray);
this.notifyItemRangeInserted(0, iconsList.size() - 1);
}
public void clearIconsList() {
this.iconsList.clear();
this.iconsArray.clear();
}
@Override
public IconsHolder onCreateViewHolder(ViewGroup parent, int viewType) {
LayoutInflater inflater = LayoutInflater.from(parent.getContext());
return new IconsHolder(inflater.inflate(R.layout.item_icon, parent, false));
}
@Override
public void onBindViewHolder(IconsHolder holder, int position) {
if (iconsArray.size() > 0) {
holder.icon.setImageResource(iconsArray.get(position));
}
holder.view.setTag(position);
holder.view.setOnClickListener(this);
setAnimation(holder.icon, position);
}
private int lastPosition = -1;
private void setAnimation(View viewToAnimate, int position) {
if (position > lastPosition) {
viewToAnimate.setHasTransientState(true);
lastPosition = position;
}
}
@Override
public int getItemCount() {
return iconsList == null ? 0 : iconsList.size();
}
@Override
public void onClick(View v) {
int position = (Integer) v.getTag();
int resId = iconsArray.get(position);
String name = iconsList.get(position).toLowerCase(Locale.getDefault());
MaterialDialog dialog = new MaterialDialog.Builder(context)
.customView(R.layout.dialog_icon, false)
.title(Util.makeTextReadable(name))
.positiveText(R.string.close)
.show();
if (dialog.getCustomView() != null) {
ImageView dialogIcon = (ImageView) dialog.getCustomView().findViewById(R.id.dialogicon);
dialogIcon.setImageResource(resId);
}
}
class IconsHolder extends RecyclerView.ViewHolder {
final View view;
final ImageView icon;
IconsHolder(View v) {
super(v);
view = v;
icon = (ImageView) v.findViewById(R.id.icon_img);
}
}
}
答案 0 :(得分:0)
图像有多大?尝试缩小它们(例如通过Picasso调整大小)