我的Recycler View有以下ViewHolder类,
inner class ItemViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
private val dateText = itemView.itemDateSummaryList
private val systolicVal = itemView.systolicValue
private val diastolicVal = itemView.diastolicValue
fun update(listItem: SummaryListItemModel) {
Log.i(TAG, "Update method called " + listItem.date)
dateText.text = listItem.date
systolicVal.text = listItem.sysVal.toInt().toString()
diastolicVal.text = listItem.diasVal.toInt().toString()
}
}
但是,当我运行该应用程序时,该dateText.text = listItem.date说法出现错误,
java.lang.IllegalStateException: dateText must not be null
at *****.******.*****.ui.detailview.bloodpressure.SummaryListAdapter$ItemViewHolder.update(SummaryListAdapter.kt:68)
但是listItem.date不是null我已经检查了Log.
在回收物品时，我在回收者视图上的产品上遇到这种奇怪的崩溃，而且我也无法重现此崩溃。
Fatal Exception: java.lang.IllegalStateException: Already in the pool!
at androidx.core.util.Pools$SimplePool.release(Pools.java:117)
at androidx.recyclerview.widget.AdapterHelper.recycleUpdateOp(AdapterHelper.java:743)
at androidx.recyclerview.widget.AdapterHelper.recycleUpdateOpsAndClearList(AdapterHelper.java:750)
at androidx.recyclerview.widget.AdapterHelper.consumePostponedUpdates(AdapterHelper.java:123)
at androidx.recyclerview.widget.AdapterHelper.consumeUpdatesInOnePass(AdapterHelper.java:557)
at androidx.recyclerview.widget.RecyclerView.processAdapterUpdatesAndSetAnimationFlags(RecyclerView.java:3585)
at androidx.recyclerview.widget.RecyclerView.dispatchLayoutStep1(RecyclerView.java:3829)
at androidx.recyclerview.widget.RecyclerView.dispatchLayout(RecyclerView.java:3639)
at androidx.recyclerview.widget.RecyclerView.consumePendingUpdateOperations(RecyclerView.java:1877)
at androidx.recyclerview.widget.RecyclerView$ViewFlinger.run(RecyclerView.java:5044)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:1092)
at android.view.Choreographer.doCallbacks(Choreographer.java:893)
at android.view.Choreographer.doFrame(Choreographer.java:809)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:1078)
at android.os.Handler.handleCallback(Handler.java:891)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:207)
at android.app.ActivityThread.main(ActivityThread.java:7539)
at java.lang.reflect.Method.invoke(Method.java)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:524)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:958)
我有一个填充数据的适配器RecyclerView.
我没有打电话notifyDataSetChanged(),我在Fragment 中将适配器设置为RecyclerViewin onCreateView()(所以getItemCount()应该调用一次),但我发现getItemCount()多次调用.
[第一次提问者和第一次安卓编码器所以我道歉,如果我做错了什么]
我正在尝试更改我的回收器上的itemview内部的值.但是,如果该项目视图恰好在屏幕外,则findViewBy [布局,适配器或ID]将显示为null.
public void setUserActive(UserListAdapter adapter, RecyclerView recyclerView, int position, View v) {recyclerView.findViewHolderForItemId(adapter.getItemId(position));
TextView txtActive = (TextView) vh.itemView.findViewById(R.id.user_isActive);
txtActive.setText("Active");
UserListAdapter.ViewHolder inactivevh = (UserListAdapter.ViewHolder) recyclerView.findViewHolderForItemId(adapter.getItemId(adapter.getActiveUserPosition()));
TextView txtInActive = (TextView) inactivevh.itemView.findViewById(R.id.user_isActive);
txtInActive.setText("");
adapter.setActiveUserPosition(position);
}
我尝试了几种不同的方法,从使用
UserListAdapter.ViewHolder vh = (UserListAdapter.ViewHolder) recyclerView.findViewHolderForLayoutPosition(position);
要么
UserListAdapter.ViewHolder inactivevh = (UserListAdapter.ViewHolder) recyclerView.findViewHolderForAdapterPosition(position)
当应该处于inactivevh的视图关闭时,它们都会失败.
我已将适配器设置为hasStableIDs = true notifydatasetchanged似乎也没有帮助.
我想点击一个按钮滚动到回收站视图的底部,我该怎么做？
android android-layout recycler-adapter android-recyclerview
任何想法如何LayoutManager在一个视图中使用两个不同的？我在屏幕和底部的顶格四张牌,我想LinearLayout,但RecyclerView一次显示一个视图
RecyclerView.LayoutManager mLayoutManager = new GridLayoutManager(this, 2);
recyclerView.setLayoutManager(mLayoutManager);
RecyclerView.LayoutManager lmLayoutManager = new LinearLayoutManager(this);
recyclerView.setLayoutManager(lmLayoutManager);
recyclerView.addItemDecoration(new GridSpacingDashboard(2, dpToPx(2), true));
recyclerView.setItemAnimator(new DefaultItemAnimator());
recyclerView.setAdapter(adapter);
有没有什么方法可以在单个RecyclerView或者在索引OI上使用两个视图,GridLayout并且在1上显示LinearLayout,如果有任何可能性,如何实现
更新(卡适配器)
public class CardAdapter extends RecyclerView.Adapter<adapter.CardAdapter.CardViewHolder> {
public static final int topGridCard = 0;
public static final int bottomCards=1;
private Context mContext;
private List<CardModel> cardList;
public CardAdapter(Context mContext, List<CardModel> cardList) {
this.mContext = mContext;
this.cardList = cardList;
}
@Override
public.adapter.CardAdapter.CardViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View …android android-layout recycler-adapter android-recyclerview
我使用RecyclerView适配器来显示活动内部的数据,我想onClickListener在活动内部实现,目前,我onClickListener正常设置内部适配器,工作正常.
public void onBindViewHolder(MyHolder holder, final int position) {
final Listdata data = listdata.get(position);
holder.vname.setText(data.getName());
holder.vname.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Toast.makeText(activity, "clicked on " +position, Toast.LENGTH_SHORT).show();
}
});
}
但是我想在活动中实现它,所以我有更大的控制权.这不符合我的目的.我认为这对我们很多人都有用.
我开始实施MVVM,我不知道是否使用ViewModel内部我Adapter是一个良好的实践或AntiPattern.
举个例子,考虑一下颜色列表和一个你将改变背景的图像.在这种情况下,我正在观察所选的颜色并绑定背景颜色以在UI中显示.
但是我在两个地方观察颜色选择:
Fragment为了改变背景颜色Adapter显示中选择哪种颜色所以,MVVM当我通过并观察ViewModel到时,我是否正确使用Adapter？
版图设计:
HorizontalScrollView-parent, holding RV[
RecyclerView=>(GridLayoutManager) (orientation verticle)]
哪个基本上会做双向滚动.此UI适用于电视.此网格中的焦点行将显示额外的细节,而其他行则不会.所以,每当有从一行的焦点变化到另一个onFocusChange我修改dataset的Adapter,并调用notifyItemRangeChanged().
当行长度超过屏幕的垂直长度,即垂直可滚动时,这可以正常工作.发生崩溃就像是行数较少(如4).
错误:
java.lang.IllegalArgumentException: parameter must be a descendant of this view
at android.view.ViewGroup.offsetRectBetweenParentAndChild(ViewGroup.java:5937)
at android.view.ViewGroup.offsetDescendantRectToMyCoords(ViewGroup.java:5866)
at android.widget.HorizontalScrollView.isWithinDeltaOfScreen(HorizontalScrollView.java:1168)
at android.widget.HorizontalScrollView.onSizeChanged(HorizontalScrollView.java:1569)
at android.view.View.sizeChange(View.java:19719)
at android.view.View.setFrame(View.java:19680)
at android.view.View.layout(View.java:19583)
at android.view.ViewGroup.layout(ViewGroup.java:6053)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1791)
at android.widget.LinearLayout.layoutHorizontal(LinearLayout.java:1780)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1546)
at android.view.View.layout(View.java:19586)
at android.view.ViewGroup.layout(ViewGroup.java:6053)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1791)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1635)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1544)
at android.view.View.layout(View.java:19586)
at android.view.ViewGroup.layout(ViewGroup.java:6053)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1791)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1635)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1544)
at android.view.View.layout(View.java:19586)
at android.view.ViewGroup.layout(ViewGroup.java:6053)
at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1080)
at android.view.View.layout(View.java:19586)
at android.view.ViewGroup.layout(ViewGroup.java:6053)
at …android horizontalscrollview gridlayoutmanager recycler-adapter android-recyclerview
我有一个RecyclerView带适配器的布局:
public class SimpleRecyclerAdapter extends RecyclerView.Adapter<SimpleViewHolder> {
protected List<JSONObject> data = new ArrayList<>();
public List<JSONObject> getData() { return data; }
}
我更新它的适配器,如:
public void udpdateFromJson( JSONObject payload ) {
JSONArray msgs = payload.optJSONArray( "messages" );
for( int ix = 0; null != msgs && ix < msgs.length(); ix++ ){
JSONObject o = msgs.optJSONObject( ix );
if( loadingMore ) adapter.getData().add( 1 + ix, o );
else adapter.getData().add( o );
}
adapter.notifyDataSetChanged();
recyclerView.invalidate();
}
问题是,只有当我触摸或滚动视图时才会看到新项目.
我错过了什么？
更新:
解决问题我更换了线
adapter.notifyDataSetChanged();
recyclerView.invalidate(); …