【发布时间】：2019-01-03 06:08:25
【问题描述】：
在我的activity_main.xml中| 在我的 android RecyclerView 中只显示一半的屏幕，我无法找出错误。帮帮我，伙计们。我使用了不同的布局，例如 relativelayout、constraintlayout、linearlayout。但我只得到了屏幕 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>
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);
}
}
下面我附上我的适配器类
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;
}
}
我在下面附上我的项目 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>
【问题讨论】：
-
所以你是说recyclerView占据了手机屏幕宽度的一半？
-
使用这个
View view=layoutInflater.inflate(R.layout.recyclerview_items,viewGroup,false);而不是这个View view = layoutInflater.inflate(R.layout.recyclerview_items, null); -
感谢您的重播。我更改了相对布局中的所有布局。我解决了我的问题。但我无法在约束布局中实现。
标签： android android-recyclerview