infoOfPost.java

 

    package com.sakib23.task1;

    public class infoOfPost {
        String UserName;
        String ProjectTitle, ProjectDescription, ProjectTime;
        boolean ProjectFlag;

        public infoOfPost(String userName, String projectTitle, String projectDescription, String projectTime, boolean projectFlag) {
            UserName = userName;
            ProjectTitle = projectTitle;
            ProjectDescription = projectDescription;
            ProjectTime = projectTime;
            ProjectFlag = projectFlag;
        }

        public String getUserName() {
            return UserName;
        }

        public void setUserName(String userName) {
            UserName = userName;
        }

        public String getProjectTitle() {
            return ProjectTitle;
        }

        public void setProjectTitle(String projectTitle) {
            ProjectTitle = projectTitle;
        }

        public String getProjectDescription() {
            return ProjectDescription;
        }

        public void setProjectDescription(String projectDescription) {
            ProjectDescription = projectDescription;
        }

        public String getProjectTime() {
            return ProjectTime;
        }

        public void setProjectTime(String projectTime) {
            ProjectTime = projectTime;
        }

        public boolean getProjectFlag() {
            return ProjectFlag;
        }

        public void setProjectFlag(boolean projectFlag) {
            ProjectFlag = projectFlag;
        }
    }
    

MainActivity.java

package com.sakib23.task1;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {

    RecyclerView recyclerView;
    ArrayList<infoOfPost> arrayList;

    myAdapter adapter;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        recyclerView = findViewById(R.id.RecyclerViewID);
        arrayList = new ArrayList<>();

        arrayList.add(new infoOfPost("A B C", "B", "C", "01/02/12", true));
        arrayList.add(new infoOfPost("B A A", "B", "C", "06/02/12", true));
        arrayList.add(new infoOfPost("A B A", "B", "C", "01/03/12", false));
        arrayList.add(new infoOfPost("C A A", "B", "C", "02/03/12", false));
        arrayList.add(new infoOfPost("A A A", "B", "C", "01/09/12", true));
        arrayList.add(new infoOfPost("A L A", "B", "C", "11/12/12", false));

        adapter = new myAdapter(this, arrayList);
        recyclerView.setAdapter(adapter);
        recyclerView.setLayoutManager(new LinearLayoutManager(MainActivity.this));
    }
}

miAdaptador.java

 

    package com.sakib23.task1;

    import android.content.Context;
    import android.support.annotation.NonNull;
    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.TextView;
    import android.widget.Toast;

    import java.util.ArrayList;

    public class myAdapter extends RecyclerView.Adapter {

        Context context;
        ArrayList arrayList;

        public myAdapter(Context context, ArrayList arrayList) {
            this.context = context;
            this.arrayList = arrayList;
            Log.d("TAGG", "Total Size: " + arrayList.size()); // Okay it is fine.

        }

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

        @Override
        public void onBindViewHolder(@NonNull MyViewHolder myViewHolder, int i) {
            Log.d("TAGG", "index " + i); // it is not incrementing
            myViewHolder.userName.setText(arrayList.get(i).getUserName());
            myViewHolder.projectTitle.setText(arrayList.get(i).getProjectTitle());
            myViewHolder.projectDescription.setText(arrayList.get(i).getProjectDescription());
            myViewHolder.projectTime.setText(arrayList.get(i).getProjectTime());
            if(arrayList.get(i).getProjectFlag() == false)
                myViewHolder.projectFlag.setText("Not Flagged Post");
             else myViewHolder.projectFlag.setText("Flagged Post");
        }

        @Override
        public int getItemCount() {
            Log.d("TAGG",   " GETSIZE " + arrayList.size()  ); // it is also fine..
            return arrayList.size();
        }

        class MyViewHolder extends RecyclerView.ViewHolder {
            TextView userName, projectTitle, projectDescription, projectTime, projectFlag;
            public MyViewHolder(@NonNull View itemView) {
                super(itemView);

                userName = itemView.findViewById(R.id.usernameID);
                projectTitle = itemView.findViewById(R.id.projecttitleID);
                projectDescription = itemView.findViewById(R.id.projectdesriptionID);
                projectTime = itemView.findViewById(R.id.projecttimeID);
                projectFlag = itemView.findViewById(R.id.projectflagID);
            }
        }
    }


    

actividad_principal.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:padding="10dp"
    android:orientation="vertical"
    tools:context=".MainActivity">


    <android.support.v7.widget.RecyclerView

        android:id="@+id/RecyclerViewID"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

    </android.support.v7.widget.RecyclerView>
</LinearLayout>

publicación_de_muestra

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

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="UserName"
        android:id="@+id/usernameID"
        />

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="ProjectTitle"
        android:id="@+id/projecttitleID"
        />


    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="ProjectDescription"
        android:id="@+id/projectdesriptionID"
        />


    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="ProjectTime"
        android:id="@+id/projecttimeID"
        />


    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Flag"
        android:id="@+id/projectflagID"
        />
</LinearLayout>

Aquí, en el archivo myAdapter.java, el índice onBindViewHolder no aumenta. Por favor, ayúdame.

respuesta

El elemento de vista en su soporte de vista ocupa toda la altura del diseño. Utilice "wrap_content" en su lugar. Para el LinearLayout principal en sample_post.xml, utiliceandroid:layout_height = "wrap_content"

Este ha sido un problema que he experimentado con los adaptadores. La recomendación es usar el método de ViewHolder getAdapterPosition()para obtener un índice más actualizado. Para ti será myViewHolder.getAdapterPosition()obtener un índice.