Question

package com.android_examples.recyclerview_android_examplescom;
import android.content.Context;
import android.graphics.Color;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.view.Window;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;

public class MainActivity extends AppCompatActivity {

    Context context;
    RecyclerView recyclerView;
    LinearLayout relativeLayout;
    Button button;
    RecyclerView.Adapter recyclerViewAdapter;
    RecyclerView.LayoutManager recylerViewLayoutManager;
    String[] subjects =
            {
            "ANDROID",
            "PHP",
            "BLOGGER",
            "WORDPRESS",
            "JOOMLA",
            "ASP.NET",
            "JAVA",
            "C++",
            "MATHS",
            "HINDI",
            "ENGLISH"};

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_ACTION_BAR);

        setContentView(R.layout.activity_main);

        context = getApplicationContext();

        relativeLayout = (LinearLayout) findViewById(R.id.relativelayout1);
        button = (Button) findViewById(R.id.button);

        recyclerView = (RecyclerView) findViewById(R.id.recyclerview1);

        recylerViewLayoutManager = new LinearLayoutManager(context);

        recyclerView.setLayoutManager(recylerViewLayoutManager);

        recyclerViewAdapter = new RecyclerViewAdapter(context, subjects);

        recyclerView.setAdapter(recyclerViewAdapter);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                recylerViewLayoutManager.findViewByPosition(10).setBackgroundColor(Color.BLUE);
            }
        });
    }
}

activity_main： -

<?xml version="1.0" encoding="utf-8"?>
<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="match_parent"
   android:orientation="vertical"
    tools:context="com.android_examples.recyclerview_android_examplescom.MainActivity"
    android:id="@+id/relativelayout1">

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Change"
        android:id="@+id/button"/>

    <android.support.v7.widget.RecyclerView
        android:id="@+id/recyclerview1"
        android:scrollbars="vertical"
        android:layout_marginTop="20dp"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" />

</LinearLayout>

RecyclerAdapter： -

package com.android_examples.recyclerview_android_examplescom;

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.ViewHolder>{

    String[] SubjectValues;
    Context context;
    View view1;
    ViewHolder viewHolder1;
    TextView textView;

    public RecyclerViewAdapter(Context context1,String[] SubjectValues1){

        SubjectValues = SubjectValues1;
        context = context1;
    }

    public static class ViewHolder extends RecyclerView.ViewHolder{

        public TextView textView;

        public ViewHolder(View v){

            super(v);

            textView = (TextView)v.findViewById(R.id.subject_textview);
        }
    }

    @Override
    public RecyclerViewAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType){

        view1 = LayoutInflater.from(context).inflate(R.layout.recyclerview_items,parent,false);

        viewHolder1 = new ViewHolder(view1);

        return viewHolder1;
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position){
package com.android_examples.recyclerview_android_examplescom;

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.ViewHolder>{

    String[] SubjectValues;
    Context context;
    View view1;
    ViewHolder viewHolder1;
    TextView textView;

    public RecyclerViewAdapter(Context context1,String[] SubjectValues1){

        SubjectValues = SubjectValues1;
        context = context1;
    }

    public static class ViewHolder extends RecyclerView.ViewHolder{

        public TextView textView;

        public ViewHolder(View v){

            super(v);

            textView = (TextView)v.findViewById(R.id.subject_textview);
        }
    }

    @Override
    public RecyclerViewAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType){

        view1 = LayoutInflater.from(context).inflate(R.layout.recyclerview_items,parent,false);

        viewHolder1 = new ViewHolder(view1);

        return viewHolder1;
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position){

        holder.textView.setText(SubjectValues[position]);
    }

    @Override
    public int getItemCount(){

        return SubjectValues.length;
    }
}
    holder.textView.setText(SubjectValues[position]);
}

@Override
public int getItemCount(){

    return SubjectValues.length;
}

}

如果我想从按钮单击更改Recyclerview中的特定项目的背景，它将仅对可见项目产生影响，而不是对于不可见的方式（第一项对用户可见，它将影响，但对于最后一项，它不会改变颜色）

请帮助我......

提前致谢..

Answer 1

首先在此设置视图下获取convertView（视图对象）的单击操作

if(!convertView.isSelected()){
convertView.setSelected(true);
//here change the background color as selected.
}else{
convertView.setSelected(false);
//here change the background color as unselected.
}

亨德尔在选拔中被选为现状。

如何获取convertView对象引用

Answer 2

OnItemClickListener将为您提供视图的位置，您可以使用以下代码更改所选定位行的背景

private View SelectedItem;

private void BackColor(View view) {
 if (SelectedItem != null) {
    SelectedItem.setBackgroundColor(Color.TRANSPARENT);
 }
 view.setBackgroundColor(getResources().getColor(R.color.colorPrimaryDark));
SelectedItem = view;

}
yourListview.setOnItemClickListener(new AdapterView.OnItemClickListener()

{
 @Override
 public void onItemClick (AdapterView < ? > adapterView, View view,int i, long l){
    BackColor(view);
   }
}

我没有通过recyclelerview外面的按钮点击获得recyclerview项目的背景颜色。

2 个答案: