recyclerview - listview dinamico android studio

RecycleView mostrando solo el primer elemento

Question

Aquí está el problema: creo el RecyclerView más simple del mundo, pero solo muestra el primer elemento. No puedo entender por qué. Gracias por cualquier ayuda.

item_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/tv_detail"/>
</RelativeLayout>

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
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:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.bcit.moonlady.testrecycler.MainActivity">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello World!"
android:id="@+id/tv_hello"/>
<android.support.v7.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="300dp"
android:id="@+id/rv_details"
android:layout_below="@+id/tv_hello"/>
</RelativeLayout>

MainActivity.java

package com.bcit.moonlady.testrecycler;
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.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
String[] data = {"test1", "test2", "test3"};
RecyclerView mRecView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mRecView = (RecyclerView)findViewById(R.id.rv_details);
mRecView.setHasFixedSize(true);
mRecView.setLayoutManager(new LinearLayoutManager(getApplicationContext()));
mRecView.setAdapter(new DetailAdapter());
}
private class DetailView extends RecyclerView.ViewHolder {
TextView mTextView;
public DetailView(View itemView) {
super(itemView);
mTextView = (TextView)itemView.findViewById(R.id.tv_detail);
}
public void bindView(String string) {
mTextView.setText(string);
}
}
private class DetailAdapter extends RecyclerView.Adapter<DetailView> {
@Override
public DetailView onCreateViewHolder(ViewGroup parent, int viewType) {
LayoutInflater layoutInflater = LayoutInflater.from(parent.getContext());
View v = layoutInflater.inflate(R.layout.item_layout, parent, false);
return new DetailView(v);
}
@Override
public void onBindViewHolder(DetailView holder, int position) {
String string = data[position];
holder.bindView(string);
}
@Override
public int getItemCount() {
return data.length;
}
}
}

Answer 1

En primer lugar, debe colocar su clase Recyclerview.veiwholder dentro del adaptador para asegurarse de que obtiene la misma instancia.

//replaces contents of a view, invoked by the layout manager
@Override public void onBindViewHolder(ViewHolder holder, int position) {
// get the message to display from the array at the specified position
// replace contents of the view with the new element
holder.mytextview.setText(recieveHistory.get(position));
}

Answer 2

Establezca la altura en wrap_content de RelativeLayout en el item_layout.xml.

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/tv_detail"/>
</RelativeLayout>

Answer 3

Yo también cometí este error común. Solo cambia tu padre LinearLayout - la altura debe ser "wrap_content"

<LinearLayout
android:layout_width="match_parent"
android:layout_height = "wrap_content"
..... >
..
..
</LinearLayout>

Answer 4

puede ayudar

customAdapter = new CustomRecycleradapter(arrItems);
recyclerView.setLayoutManager(new LinearLayoutManager(mParentActivity));
recyclerView.setAdapter(customAdapter);
ArrayList<ListofItems> mSource;
// adapter class
public CustomRecycleradapter(ArrayList<ListofItems> source) {
this.mSource = source;
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext())
.inflate(R.layout.item, parent, false);
return new CustomHolder(view);
}
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
if (holder instanceof CustomHolder) {
((CustomHolder) holder).customerName.setText(mSource.get(position).getCustomerNumber());
}
}
@Override
public int getItemCount() {
return mSource.size();
}
public void addItem(ArrayList<ListofItems> itemLists) {
mSource.addAll(itemLists);
notifyItemInserted(mSource.size() - 1);
}
public class CustomHolder extends RecyclerView.ViewHolder {
@Bind(R.id.customer_name)
TextView customerName;
@Bind(R.id.time_stamp)
TextView timeStamp;
@Bind(R.id.amount)
TextView amount;
public CustomHolder(View itemView) {
super(itemView);
ButterKnife.bind(this, itemView);
}
}

Answer 5

Actividad:

import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;
import android.view.LayoutInflater;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.view.ViewGroup;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
private RecyclerView mRecycler;
String[] data = {"test1", "test2", "test3"};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
mRecycler = (RecyclerView) findViewById(R.id.rv_details);
DetailAdapter adapter = new DetailAdapter();
LinearLayoutManager manager = new LinearLayoutManager(this);
mRecycler.setHasFixedSize(true);
mRecycler.setLayoutManager(manager);
mRecycler.setAdapter(adapter);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
private class DetailAdapter extends RecyclerView.Adapter<DetailAdapter.DetailView> {
@Override
public void onBindViewHolder(DetailView holder, int position) {
String string = data[position];
holder.bindView(string);
}
@Override
public DetailView onCreateViewHolder(ViewGroup parent, int viewType) {
LayoutInflater layoutInflater = LayoutInflater.from(parent.getContext());
View v = layoutInflater.inflate(R.layout.item_layout, parent, false);
return new DetailView(v);
}
@Override
public int getItemCount() {
return data.length;
}
class DetailView extends RecyclerView.ViewHolder {
TextView mTextView;
public DetailView(View itemView) {
super(itemView);
mTextView = (TextView)itemView.findViewById(R.id.tv_detail);
}
public void bindView(String string) {
mTextView.setText(string);
}
}
}
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
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:fitsSystemWindows="true"
tools:context=".MainActivity">
<android.support.design.widget.AppBarLayout android:layout_height="wrap_content"
android:layout_width="match_parent" android:theme="@style/AppTheme.AppBarOverlay">
<android.support.v7.widget.Toolbar android:id="@+id/toolbar"
android:layout_width="match_parent" android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary" app:popupTheme="@style/AppTheme.PopupOverlay" />
</android.support.design.widget.AppBarLayout>
<include layout="@layout/content_main" />
<android.support.design.widget.FloatingActionButton android:id="@+id/fab"
android:layout_width="wrap_content" android:layout_height="wrap_content"
android:layout_gravity="bottom|end" android:layout_margin="@dimen/fab_margin"
android:src="@android:drawable/ic_dialog_email" />
</android.support.design.widget.CoordinatorLayout>

content_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent"
android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:showIn="@layout/activity_main" tools:context=".MainActivity">
<android.support.v7.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/rv_details"
/>
</RelativeLayout>

item_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/tv_detail"/>
</RelativeLayout>

Answer 6

Debe cambiar la altura de item_layout como wrap_content si está utilizando la biblioteca de soporte de Android v 23.2.0 y superior

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/tv_detail"/>
</RelativeLayout>