在android应用程序的RecyclerView视图中，仅显示一半的手机

时间：2019-01-03 06:08:25

标签： android android-recyclerview recycler-adapter

在我的activity_main.xml |中 在我的Android RecyclerView中仅显示屏幕的一半，我无法找出错误。帮帮我我使用了不同的布局，例如relativelayout，constraintlayout，linearlayout。但我只得到屏幕RecyclerView的一半大小。

 <?xml version="1.0" encoding="utf-8"?>
    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="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.support.v7.widget.SearchView
            android:id="@+id/search"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@color/colorPrimaryDark"
            android:focusable="false"
            android:visibility="gone"
            app:iconifiedByDefault="false"
            app:queryHint="Search Distributors..." />

        <android.support.v7.widget.RecyclerView
            android:id="@+id/recyclerView"
            android:layout_width="match_parent"
            android:layout_below="@+id/search"
            android:layout_centerInParent="true"
            android:layout_height="match_parent" />

        <Button
            android:id="@+id/btnGet"
            android:visibility="gone"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="10dp"
            android:layout_alignParentBottom="true"
            android:text="get" />


    </RelativeLayout>

在这里附上我的MainActivity.java 

package com.example.admin.recyclerview;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.DefaultItemAnimator;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.SearchView;
import android.view.View;
import android.widget.Button;

import com.google.gson.Gson;

import java.util.ArrayList;
import java.util.List;


    public class MainActivity extends AppCompatActivity {

        private List<Model> models;
        RecyclerView recyclerView;
        private RecyclerView.LayoutManager layoutManager;
        public SearchView searchView;
        private Button button;
        private RecyclerViewAdapter recyclerViewAdapter;

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            recyclerView = findViewById(R.id.recyclerView);
            recyclerView.setLayoutManager(new LinearLayoutManager(this));
            searchView = findViewById(R.id.search);
            button = findViewById(R.id.btnGet);
            button.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    List<Model> models1 = recyclerViewAdapter.getList();
                    System.out.println("final order list "+new Gson().toJson(models1));
                }
            });
            searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
                @Override
                public boolean onQueryTextSubmit(String query) {
                    return false;
                }

                @Override
                public boolean onQueryTextChange(String newText) {
                    if (recyclerViewAdapter != null) {
                        recyclerViewAdapter.getFilter().filter(newText);
                    }
                    return true;
                }
            });

            //recyclerView.setHasFixedSize(true);

            models = new ArrayList<>();
            models.add(new Model("rajesh"));
            models.add(new Model("deva"));
            models.add(new Model("merlin"));
            models.add(new Model("antony"));
            models.add(new Model("giri"));
            models.add(new Model("guru"));
            System.out.println("get the position " + 
            models.get(0).getName());
            System.out.println("json view "+new Gson().toJson(models));
            recyclerViewAdapter = new 
            RecyclerViewAdapter(getApplicationContext(), models);

            recyclerView.setAdapter(recyclerViewAdapter);

        }
    }

我在下面附加我的适配器类

public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.MyViewHolder> implements Filterable {

    public Context context;
    private List<Model> modelList;
    private List<Model> myfilterList;


    public RecyclerViewAdapter(Context context, List<Model> modelList) {
        this.context = context;
        this.modelList = modelList;
        this.myfilterList = modelList;
    }

    @NonNull
    @Override
    public MyViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
        LayoutInflater layoutInflater = LayoutInflater.from(context);
        View view = layoutInflater.inflate(R.layout.recyclerview_items, null);
        return new MyViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull MyViewHolder myViewHolder, int i) {
        Model model = myfilterList.get(i);
        myViewHolder.llMain.setTag(i);
        myViewHolder.textView.setText(model.getName());
    }

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

    @Override
    public Filter getFilter() {
        return new Filter() {
            @Override
            protected FilterResults performFiltering(CharSequence constraint) {
                String text = constraint.toString();
                if (text.isEmpty()) {
                    myfilterList = modelList;
                } else {
                    ArrayList<Model> filterable = new ArrayList<>();
                    for (Model model : modelList) {
                        System.out.println("check equal " + model.getName() 
                         + "   " + text);
                        if (model.getName().toLowerCase().contains(text)) {
                            filterable.add(model);
                        }
                    }
                    myfilterList = filterable;
                }
                FilterResults filterResults = new FilterResults();
                filterResults.values = myfilterList;
                return filterResults;
            }

            @Override
            protected void publishResults(CharSequence constraint, FilterResults results) {
                myfilterList = (ArrayList<Model>) results.values;
                notifyDataSetChanged();

            }
        };
    }

    class MyViewHolder extends RecyclerView.ViewHolder {
        TextView textView;
        Button btnAdd, btnMinus;
        LinearLayout llMain;

        MyViewHolder(@NonNull View itemView) {
            super(itemView);
            textView = itemView.findViewById(R.id.tvName);
            btnAdd = itemView.findViewById(R.id.btnAdd);
            btnMinus = itemView.findViewById(R.id.btnMinus);
            llMain = itemView.findViewById(R.id.llMain);

            btnAdd.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    int pos = (Integer) llMain.getTag();
                    System.out.println("linear layout position details 
                    "+pos);
                    myfilterList.add(pos+1, new Model("dummy"));
                    notifyItemChanged(pos+1);
                    notifyDataSetChanged();
                }
            });
        }
    }
    public List<Model> getList()
    {
        return myfilterList;
    }
}

我在这里附上我的商品xml 

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/llMain"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical">
<TextView
    android:id="@+id/tvName"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:textAlignment="center"
    android:textSize="16sp"
    android:layout_margin="5dp"/>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">
        <Button
            android:id="@+id/btnAdd"
            android:layout_weight="1"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:text="Add Items"/>
        <Button
            android:id="@+id/btnMinus"
            android:layout_weight="1"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:text="Add Items"/>

    </LinearLayout>
</LinearLayout>

4 个答案:

答案 0 :(得分：1)

尝试使用以下方法更改RecyclerView文件中的activity_main.xml元素，删除center_in_parent并更改android:layout_height="wrap_content" 

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="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.support.v7.widget.SearchView
        android:id="@+id/search"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/colorPrimaryDark"
        android:focusable="false"
        android:visibility="gone"
        app:iconifiedByDefault="false"
        app:queryHint="Search Distributors..." />

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

    <Button
        android:id="@+id/btnGet"
        android:visibility="gone"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"
        android:layout_alignParentBottom="true"
        android:text="get" />


</RelativeLayout>

编辑1-使用ConstraintLayout，因为在RecyclerView之后您还想显示按钮，所以您需要在ConstraintLayout NestedScrollView > 

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.NestedScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
<android.support.constraint.ConstraintLayout 
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <android.support.v7.widget.SearchView
        android:id="@+id/search"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:layout_constraintTop_toTopOf="parent"
        android:background="@color/colorPrimaryDark"
        android:focusable="false"
        app:iconifiedByDefault="false"
        app:queryHint="Search Distributors..." />

    <android.support.v7.widget.RecyclerView
        android:id="@+id/recyclerView"
        android:layout_width="match_parent"
        app:layout_constraintTop_toBottomOf="@+id/search"
        android:layout_height="wrap_content" />

    <Button
        android:id="@+id/btnGet"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/recyclerView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"
        android:layout_alignParentBottom="true"
        android:text="get" />


</android.support.constraint.ConstraintLayout>
</android.support.v4.widget.NestedScrollView>

答案 1 :(得分：1)

我没有添加评论的特权，因此无法在此处发布评论。不好意思 您的问题不太清楚，您是否希望RecyclerView占据整个屏幕（即parent）。如果是这样的话，我猜如果使用LinearLayout在android:layout_weight中添加属性RecyclerView可以解决问题。 这是developer.android网站上该属性的说明：

LinearLayout还支持使用android:layout_weight属性为单个孩子分配权重。该属性根据视图应在屏幕上占据多少空间来为其分配“重要性”值。较大的权重值使其可以扩展以填充父视图中的所有剩余空间。子视图可以指定一个权重值，然后视图组中的所有剩余空间将按其声明的权重比例分配给子视图。默认权重为零。

希望此链接对https://developer.android.com/guide/topics/ui/layout/linear

有帮助

我已经问过一个问题：What is the connection between setVisibility and layout_weight in Linear Layout

如果我错了，请纠正我。

答案 2 :(得分：0)

在您要在onCreateViewHolder中填充项目的适配器中，使用以下代码块：

View rootView = LayoutInflater.from(context).inflate(R.layout.itemLayout, null, false);
RecyclerView.LayoutParams lp = new RecyclerView.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);
rootView.setLayoutParams(lp);
return new RecyclerViewHolder(rootView);

答案 3 :(得分：0)

    items.xml
    <?xml version="1.0" encoding="utf-8"?>
        <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
            android:id="@+id/llMain"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical">
        <TextView
            android:id="@+id/tvName"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:textAlignment="center"
            android:textSize="16sp"
            android:text="fdfsfsdfsd"
            android:layout_margin="5dp"/>

                <Button
                    android:id="@+id/btnAdd"
                    android:layout_width="wrap_content"
                    android:layout_below="@+id/tvName"
                    android:layout_height="wrap_content"
                    android:text="Add Items"/>
                <Button
                    android:layout_below="@+id/tvName"
                    android:id="@+id/btnMinus"
                    android:layout_alignParentEnd="true"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="Add Items"/>        
        </RelativeLayout>

activity_main.xml          

    <android.support.v7.widget.SearchView
        android:id="@+id/search"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/colorPrimaryDark"
        android:focusable="false"
        android:visibility="visible"
        app:iconifiedByDefault="false"
        app:queryHint="Search Distributors..." />

    <android.support.v7.widget.RecyclerView
        android:id="@+id/recyclerView"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_marginBottom="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/search" />
    <Button
        android:id="@+id/btnGet"
        android:visibility="visible"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"
        app:layout_constraintBottom_toBottomOf="parent"
        android:layout_alignParentBottom="true"
        android:text="get" />


</android.support.constraint.ConstraintLayout>
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