Android AsyncListUtil在刷新后保留旧数据
我在后台使用AsyncListUtil从数据库加载项 如果磁贴大小为50,则AsyncListUtil在Android AsyncListUtil在刷新后保留旧数据,android,android-recyclerview,android-support-library,Android,Android Recyclerview,Android Support Library,我在后台使用AsyncListUtil从数据库加载项 如果磁贴大小为50,则AsyncListUtil在刷新()后不会清除缓存。循环视图显示旧列表中前6项,但应显示最后6项。瓷砖大小为5时就可以了 瓷砖尺寸有限制吗?还是我的代码有问题 下面是示例代码,它也有同样的问题 public class AsyncListUtilActivity extends AppCompatActivity { private static final String TAG = "AsyncListUtil
刷新()
后不会清除缓存。循环视图显示旧列表中前6项,但应显示最后6项。瓷砖大小为5时就可以了
瓷砖尺寸有限制吗?还是我的代码有问题
下面是示例代码,它也有同样的问题
public class AsyncListUtilActivity extends AppCompatActivity {
private static final String TAG = "AsyncListUtilActivity";
private RecyclerView mRecyclerView;
private LinearLayoutManager mLinearLayoutManager;
private List<String> textList = new ArrayList<>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mRecyclerView = new RecyclerView(this);
mLinearLayoutManager = new LinearLayoutManager(this);
textList.addAll(Arrays.asList(Cheeses.sCheeseStrings));
mRecyclerView.setLayoutManager(mLinearLayoutManager);
mRecyclerView.setHasFixedSize(true);
final ViewGroup.LayoutParams layoutParams = new ViewGroup.LayoutParams(
ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);
mRecyclerView.setLayoutParams(layoutParams);
mRecyclerView.setAdapter(new AsyncAdapter(textList));
setContentView(mRecyclerView);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
super.onCreateOptionsMenu(menu);
MenuItemCompat.setShowAsAction(menu.add("Layout"), MenuItemCompat.SHOW_AS_ACTION_IF_ROOM);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
List<String> tmpList = new ArrayList<>(6);
for(int i = textList.size() - 1; i >= textList.size() - 6 ; --i) {
tmpList.add(textList.get(i));
}
textList.clear();
textList.addAll(tmpList);
((AsyncAdapter) mRecyclerView.getAdapter()).refresh();
return super.onOptionsItemSelected(item);
}
private static class TextViewHolder extends RecyclerView.ViewHolder {
TextView textView;
public TextViewHolder(Context context) {
super(new TextView(context));
textView = (TextView) itemView;
}
}
private class AsyncAdapter extends RecyclerView.Adapter<TextViewHolder> {
private AsyncListUtil<String> mAsyncListUtil;
AsyncAdapter(final List<String> textList) {
mAsyncListUtil = new AsyncStringListUtil(textList);
}
@Override
public TextViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
return new TextViewHolder(parent.getContext());
}
@Override
public void onBindViewHolder(TextViewHolder holder, int position) {
final String itemString = mAsyncListUtil.getItem(position);
if (itemString == null) {
holder.textView.setText("loading...");
} else {
holder.textView.setText(itemString);
}
}
@Override
public int getItemCount() {
return mAsyncListUtil.getItemCount();
}
public void refresh() {
mAsyncListUtil.refresh();
}
}
private class AsyncStringListUtil extends AsyncListUtil<String> {
private static final int TILE_SIZE = 50;
private static final long DELAY_MS = 500;
public AsyncStringListUtil(final List<String> textList) {
super(String.class, TILE_SIZE,
new AsyncListUtil.DataCallback<String>() {
@Override
public int refreshData() {
return textList.size();
}
@Override
public void fillData(String[] data, int startPosition, int itemCount) {
sleep();
for (int i = 0; i < itemCount; i++) {
data[i] = textList.get(startPosition + i);
}
}
private void sleep() {
try {
Thread.sleep(DELAY_MS);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
},
new AsyncListUtil.ViewCallback() {
@Override
public void getItemRangeInto(int[] outRange) {
outRange[0] = mLinearLayoutManager.findFirstVisibleItemPosition();
outRange[1] = mLinearLayoutManager.findLastVisibleItemPosition();
}
@Override
public void onDataRefresh() {
mRecyclerView.getAdapter().notifyDataSetChanged();
}
@Override
public void onItemLoaded(int position) {
mRecyclerView.getAdapter().notifyItemChanged(position);
}
});
mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
onRangeChanged();
}
});
}
}
}
公共类AsyncListUtiactivity扩展了AppCompativity活动{
私有静态最终字符串标记=“AsyncListUtilActivity”;
私人回收视图mRecyclerView;
私人线路布局经理;
private List textList=new ArrayList();
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
mRecyclerView=新的回收视图(本);
mLinearLayoutManager=新的LinearLayoutManager(此);
addAll(Arrays.asList(Cheeses.sCheeseStrings));
mRecyclerView.setLayoutManager(mLinearLayoutManager);
mRecyclerView.setHasFixedSize(true);
最终ViewGroup.LayoutParams LayoutParams=新建ViewGroup.LayoutParams(
ViewGroup.LayoutParams.MATCH_父级,ViewGroup.LayoutParams.MATCH_父级);
mRecyclerView.setLayoutParams(layoutParams);
setAdapter(新的AsyncAdapter(textList));
setContentView(mRecyclerView);
}
@凌驾
公共布尔onCreateOptions菜单(菜单){
super.onCreateOptions菜单(菜单);
MenuItemCompat.setShowAsAction(menu.add(“布局”)、MenuItemCompat.SHOW\u AS\u ACTION\u IF\u ROOM);
返回true;
}
@凌驾
公共布尔值onOptionsItemSelected(菜单项项){
List tmpList=新的ArrayList(6);
对于(int i=textList.size()-1;i>=textList.size()-6;--i){
tmpList.add(textList.get(i));
}
textList.clear();
textList.addAll(tmpList);
((AsyncAdapter)mRecyclerView.getAdapter()).refresh();
返回super.onOptionsItemSelected(项目);
}
私有静态类TextViewHolder扩展了RecyclerView.ViewHolder{
文本视图文本视图;
公共文本视图持有者(上下文){
超级(新文本视图(上下文));
textView=(textView)项目视图;
}
}
私有类AsyncAdapter扩展了RecyclerView.Adapter{
私有AsyncListUtil mAsyncListUtil;
AsyncAdapter(最终列表文本列表){
mAsyncListUtil=新的AsyncStringListUtil(文本列表);
}
@凌驾
公共文本ViewHolder onCreateViewHolder(视图组父级,int-viewType){
返回新的TextViewHolder(parent.getContext());
}
@凌驾
BindViewHolder上的公共无效(TextViewHolder,int位置){
最终字符串itemString=mAsyncListUtil.getItem(位置);
if(itemString==null){
holder.textView.setText(“加载…”);
}否则{
holder.textView.setText(itemString);
}
}
@凌驾
public int getItemCount(){
返回mAsyncListUtil.getItemCount();
}
公共无效刷新(){
mAsyncListUtil.refresh();
}
}
私有类AsyncStringListUtil扩展了AsyncListUtil{
专用静态最终整块大小=50;
专用静态最终长延时_MS=500;
公共AsyncStringListUtil(最终列表文本列表){
超级(String.class、TILE\u尺寸、,
新的AsyncListUtil.DataCallback(){
@凌驾
公共整型刷新数据(){
返回textList.size();
}
@凌驾
公共void fillData(字符串[]数据,int startPosition,int itemCount){
睡眠();
对于(int i=0;i
您需要更新ItemSource。只需调用itemSource.update()
beforelistUtil.refresh()代码>您需要更新ItemSource。只需调用itemSource.update()
beforelistUtil.refresh()代码>