【发布时间】：2018-08-16 19:00:30
【问题描述】：
我花了一些时间试图弄清楚如何将页眉/页脚添加到我的 recyclerview 中，但它不起作用。页脚显示但标题和列表项未显示在模拟器上。 我的适配器
package com.example.system2.tranxav.adapters;
import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import com.example.system2.tranxav.R;
import com.example.system2.tranxav.model.Problems;
import java.util.List;
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder>{
Context context;
private List<Problems> mDataset;
private static final int TYPE_HEADER = 0;
private static final int TYPE_FOOTER = 1;
private static final int TYPE_ITEM = 2;
public class ViewHolder extends RecyclerView.ViewHolder{
public TextView tvProblems, tvPrice;
public Button btnProblem;
public ViewHolder(View itemView) {
super(itemView);
}
}
public void add(int position, Problems item){
mDataset.add(position, item);
notifyItemInserted(position);
}
public void remove(Problems item){
int position = mDataset.indexOf(item);
mDataset.remove(position);
notifyItemRemoved(position);
}
public MyAdapter(List<Problems> myDataset){
mDataset = myDataset;
}
@Override
public MyAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView;
Log.i("info", String.valueOf(viewType));
if (viewType == TYPE_ITEM) {
//Inflating recycle view item layout
itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.activity_problems, parent, false);
ViewHolder vh = new ViewHolder(itemView);
return vh;
} else if (viewType == TYPE_HEADER) {
//Inflating header view
itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.problem_recycler_header, parent, false);
ViewHolder vh = new ViewHolder(itemView);
return vh;
} else if (viewType == TYPE_FOOTER) {
//Inflating footer view
itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.problem_recycler_footer, parent, false);
ViewHolder vh = new ViewHolder(itemView);
return vh;
}
throw new RuntimeException("there is no type that matches the type " + viewType + " + make sure your using types correctly");
}
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
try {
if (holder instanceof HeaderViewHolder) {
HeaderViewHolder headerHolder = (HeaderViewHolder) holder;
headerHolder.tvHeader.setText("Please kindly ask the mechanic what the problem is and check them to continue");
} else if (holder instanceof FooterViewHolder) {
FooterViewHolder footerHolder = (FooterViewHolder) holder;
footerHolder.btnProblem.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Log.i("info", "the button is clicked");
}
});
}
else if (holder instanceof ItemViewHolder) {
ItemViewHolder itemView = (ItemViewHolder) holder;
itemView.tvPrice.setText(mDataset.get(position).getPrice());
itemView.tvProblems.setText(mDataset.get(position).getProblems());
}
} catch (Exception e) {
e.printStackTrace();
}
}
@Override
public int getItemCount() {
return mDataset.size()+2;
}
public int getItemViewType(int position) {
if (position == 0) {
return TYPE_HEADER;
} else if (position == mDataset.size() + 1) {
return TYPE_FOOTER;
}
return TYPE_ITEM;
}
private class HeaderViewHolder extends MyAdapter.ViewHolder {
TextView tvHeader;
public HeaderViewHolder(View view) {
super(view);
tvHeader = (TextView) view.findViewById(R.id.tvHeader);
}
}
private class FooterViewHolder extends MyAdapter.ViewHolder {
Button btnSubmitProblem;
public FooterViewHolder(View view) {
super(view);
btnSubmitProblem = (Button) view.findViewById(R.id.btnProblem);
}
}
private class ItemViewHolder extends MyAdapter.ViewHolder {
TextView tvProblems, tvPrice;
public ItemViewHolder(View itemView) {
super(itemView);
tvProblems = (TextView) itemView.findViewById(R.id.tvProblems);
tvPrice = (TextView) itemView.findViewById(R.id.tvPrice);
}
}
problem_recycler_header.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/tvHeader" />
</LinearLayout>
footer_problem_recycler.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="wrap_content">
<Button
android:text="Button"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/btnProblem" />
</LinearLayout>
activity_problems.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:paddingBottom="@dimen/zerodimen"
android:paddingLeft="@dimen/zerodimen"
android:paddingRight="@dimen/zerodimen"
android:paddingTop="16dp"
tools:context="com.example.system2.tranxav.ProblemsActivity">
<android.support.v7.widget.RecyclerView
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:paddingBottom="0dp"
android:layout_marginBottom="0dp"
android:scrollbars="none"
android:id="@+id/problem_recycle_view"
xmlns:android="http://schemas.android.com/apk/res/android" />
<TextView
android:id="@+id/tvProblems"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:textSize="16dp"
android:textStyle="bold" />
<TextView
android:id="@+id/tvPrice"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:textStyle="bold" />
</LinearLayout>
我已经检查了代码以知道问题出在哪里，但我无法弄清楚。我正在从我的数据集中获取数据，但它没有显示在模拟器上。
【问题讨论】：
-
你传递给
adapter的List<Problems> mDataset;的大小是多少 -
@AbdulKawee 大小是动态的。我是从本地主机那里得到的
-
请在此处输入您的活动代码
-
是的，它是动态的，但检查它是否不是您传递的空列表
标签： android android-recyclerview recyclerview-layout