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android - 向下滚动时 RecyclerView 项目之间的间隙较大

转载 作者:IT老高 更新时间:2023-10-28 21:38:49 30 4
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我正在制作一个待办事项列表应用程序,在测试它时,由于某种原因,每当我尝试向下滚动时,项目之间就会形成巨大的差距。每当我拖放项目时总是会发生这种情况,但我的 ItemTouchHelper 适配器和回调类没有看到任何错误。如果你能帮助我,那就太好了。

之前: Before

之后: After

RecyclerAdapter.java

public class RecyclerAdapter extends                                                                                                                                 

RecyclerView.Adapter<RecyclerAdapter.RecyclerVH> implements ItemTouchHelperAdapter{
private LayoutInflater layoutInflater;
ArrayList<Info> data;
Context context;

public RecyclerAdapter(Context context) {
layoutInflater = LayoutInflater.from(context);
this.context = context;
}

public void setData(ArrayList<Info> data) {
this.data = data;
notifyDataSetChanged();
}

@Override
public RecyclerVH onCreateViewHolder(ViewGroup viewGroup, int position) {
View view = layoutInflater.inflate(R.layout.custom_row, viewGroup, false);
view.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Log.d("R.A onClick Owen", "onClick method triggered");
}
});
RecyclerVH recyclerVH = new RecyclerVH(view);
return recyclerVH;
}

@Override
public void onBindViewHolder(RecyclerVH recyclerVH, int position) {
Log.d("RecyclerView", "onBindVH called: " + position);

final Info currentObject = data.get(position);
// Current Info object retrieved for current RecyclerView item - USED FOR DELETE
recyclerVH.listTitle.setText(currentObject.title);
recyclerVH.listContent.setText(currentObject.content);

/*recyclerVH.listTitle.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// Open new Activity containing note content
Toast.makeText(this, "Opening: " + currentObject.title, Toast.LENGTH_LONG).show();
}
});*/
}

public void deleteItem(int position) {
DBInfo dbInfo = new DBInfo(context);
dbInfo.deleteNote(data.get(position));
// Deletes RV item/position's Info object

data.remove(position);
// Removes Info object at specified position

notifyItemRemoved(position);
// Notifies the RV that item has been removed
}


@Override
public int getItemCount() {
return data.size();
}

// This is where the Swipe and Drag-And-Drog methods come into place
@Override
public boolean onItemMove(int fromPosition, int toPosition) {
// Swapping positions
// ATTEMPT TO UNDERSTAND WHAT IS GOING ON HERE
Collections.swap(data, fromPosition, toPosition);
notifyItemMoved(fromPosition, toPosition);
return true;
}

@Override
public void onItemDismiss(int position) {
// Deleting item from RV and DB
deleteItem(position);
}

class RecyclerVH extends RecyclerView.ViewHolder implements View.OnClickListener{
// OnClickListener is implemented here
// Can also be added at onBindViewHolder above
TextView listTitle, listContent;

public RecyclerVH(View itemView) {
super(itemView);

listTitle = (TextView) itemView.findViewById(R.id.title);
listContent = (TextView) itemView.findViewById(R.id.content);

listTitle.setOnClickListener(this);
}

@Override
public void onClick(View v) {
Toast.makeText(context, "Opening: Note" + getLayoutPosition(), Toast.LENGTH_SHORT).show();
// PS NEVER ADD listTitle VARIABLE AS PUBLIC VARIABLE ABOVE WHICH IS GIVEN VALUE AT ONBINDVH
// THIS IS BECAUSE THE VALUE WILL CHANGE IF ITEM IS ADDED OR DELETED
}
}
}

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:fab="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity"
android:orientation="vertical"
android:weightSum="1">

<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@drawable/rounded_corners" />

<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent">

<android.support.v7.widget.RecyclerView
android:id="@+id/recyclerList"
android:layout_width="match_parent"
android:layout_height="wrap_content" />

<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent">

<com.melnykov.fab.FloatingActionButton
android:id="@+id/fab_add"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:layout_marginBottom="16dp"
android:layout_marginRight="16dp"
android:layout_marginEnd="16dp"
android:gravity="bottom|end"
android:onClick="addNote"
android:src="@drawable/fab_ic_add"
fab:fab_colorNormal="@color/colorPrimary"
fab:fab_colorPressed="@color/colorPrimaryDark"
fab:fab_colorRipple="@color/colorPrimaryDark" />
</RelativeLayout>
</FrameLayout>
</LinearLayout>

custom_row.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">

<LinearLayout
android:id="@+id/main"
android:layout_width="wrap_content"
android:layout_height="wrap_content">

<TextView
android:id="@+id/title"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:padding="8dp"
android:text="@string/test"
android:textSize="18sp"
android:textStyle="bold" />
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/main"
android:paddingLeft="8dp">
<TextView
android:id="@+id/content"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="@string/test"
android:textSize="15sp" />
</LinearLayout>
</RelativeLayout>

非常感谢任何可以帮助我的人。我一边打字一边拉头发。

编辑:我已经确认问题不是我的 ItemTouchHelper 类。 (尝试在不调用它的情况下运行,问题仍然存在。)此外,似乎当显示对话框并调出键盘时,后台的 RecyclerView 会自行解决问题。删除对话框后,问题再次出现(即滚动会在项目之间放置大量空间)

最佳答案

Luksprog 对 Gabriele Mariotti 的回答有效。

根据doc

With the release 2.3.0 there is an exciting new feature to the LayoutManager API: auto-measurement! This allows a RecyclerView to size itself based on the size of its contents. >This means that previously unavailable scenarios, such as using WRAP_CONTENT >for a dimension of the RecyclerView, are now possible. You’ll find all built in LayoutManagers now support auto-measurement.

由于此更改,请务必仔细检查项目 View 的布局参数:以前忽略的布局参数(例如 MATCH_PARENT滚动方向)现在将得到完全尊重

在你的项目布局中你必须改变:

android:layout_height="match_parent"

android:layout_height="wrap_content" 

关于android - 向下滚动时 RecyclerView 项目之间的间隙较大,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/35817610/

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