Develop Reference

null obejct reference error on setAdapter

I have Tried to set an adapter for my recycler view and it throws me the following error
Attempt to invoke virtual method 'void androidx.recyclerview.widget.RecyclerView.setAdapter(androidx.recyclerview.widget.RecyclerView$Adapter)' on a null object reference
this is the code for current activty
package com.example.myapplication;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import android.os.Bundle;
import android.widget.TextView;
public class resourcetab extends AppCompatActivity {
private TextView txt;
private DataModel2 data =new DataModel2();
private RecyclerView recyclerView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_resourcetab);
data =getIntent().getParcelableExtra("object");
resourceadapter adapter = new resourceadapter(data);
recyclerView.setAdapter(adapter);
}
}
the code for recycler view adapter
package com.example.myapplication;
import android.content.Context;
import android.content.Intent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import java.util.ArrayList;
import java.util.List;
public class resourceadapter extends RecyclerView.Adapter<resourceadapter.ViewHolder> {
private List<String> URL= new ArrayList<>();
private List<String> type=new ArrayList<>();
private List<String> Giver=new ArrayList<>();
public resourceadapter(DataModel2 data){
this.URL=data.URL;
this.type=data.type;
this.Giver=data.Giver;
}
#NonNull
#Override
public ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.each_resource , parent , false);
return new ViewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull ViewHolder holder, int position) {
URL.get(position);
holder.type1.setText(type.get(position));
holder.name1.setText(Giver.get(position));
holder.liner.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
}
});
}
#Override
public int getItemCount() {
return Giver.size();
}
public class ViewHolder extends RecyclerView.ViewHolder{
private LinearLayout liner ;
private TextView type1;
private TextView name1;
public ViewHolder(#NonNull View itemView) {
super(itemView);
liner = itemView.findViewById(R.id.liner);
name1 = itemView.findViewById(R.id.textView6);
type1 = itemView.findViewById(R.id.textView7);
}
}
}

You have to initialize your recycler view by findViewById method befor setting adapter in onCreate.
Like,
recyclerView = findViewById(R.id.recView) //id of Recycler View which you given in your xml

Problem with fragment communication(Attempt to invoke virtual method)

I have a tabbed activity with 2 fragments. I'm trying to transmit a string from the first fragment to the second fragment but I'm getting NULL POINTER EXCEPTION.
Here is the MainActivity.java:
package com.example.myapplication;
import android.os.Bundle;
import com.google.android.material.tabs.TabLayout;
import androidx.fragment.app.FragmentTransaction;
import androidx.viewpager.widget.ViewPager;
import androidx.appcompat.app.AppCompatActivity;
import com.example.myapplication.ui.main.SectionsPagerAdapter;
public class MainActivity extends AppCompatActivity implements Frag1.Exchange {
private static final String TAG = "MainActivity";
private SectionsPagerAdapter sectionsPagerAdapter;
private ViewPager viewPager;
private TabLayout tabLayout;
private void setupViewPager(ViewPager viewPager){
SectionsPagerAdapter sectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
sectionsPagerAdapter.addFragment(new Frag1(), "FirstTab");
sectionsPagerAdapter.addFragment(new Frag2(), "SecondTab");
viewPager.setAdapter(sectionsPagerAdapter);
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
sectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
viewPager = (ViewPager) findViewById(R.id.view_pager);
setupViewPager(viewPager);
tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(viewPager);
}
#Override
public void stringExchange(String s) {
Frag2 frag2 = (Frag2) getSupportFragmentManager().findFragmentByTag("SecondTab");
frag2.displayExchange(s);
}
}
Here is SectionsPagerAdapter.java
package com.example.myapplication.ui.main;
import android.content.Context;
import androidx.annotation.Nullable;
import androidx.annotation.StringRes;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentPagerAdapter;
import com.example.myapplication.R;
import java.util.ArrayList;
import java.util.List;
/**
* A [FragmentPagerAdapter] that returns a fragment corresponding to
* one of the sections/tabs/pages.
*/
public class SectionsPagerAdapter extends FragmentPagerAdapter {
private final List<Fragment> fragmentList = new ArrayList<>();
private final List<String> stringList = new ArrayList<>();
public void addFragment(Fragment fragment, String title){
fragmentList.add(fragment);
stringList.add(title);
}
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
// getItem is called to instantiate the fragment for the given page.
// Return a (defined as a static inner class below).
return fragmentList.get(position);
}
#Nullable
#Override
public CharSequence getPageTitle(int position) {
return stringList.get(position);
}
#Override
public int getCount() {
// Show 2 total pages.
return fragmentList.size();
}
}
Here is Frag1.java:
package com.example.myapplication;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.os.Build;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.webkit.WebView;
import android.widget.Button;
import android.widget.SeekBar;
import android.widget.TextView;
import android.widget.Toast;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentTransaction;
public class Frag1 extends Fragment{
private static final String TAG = "FirstTab";
private Button transfer;
private Exchange ex;
public interface Exchange{
public void stringExchange(String s);
}
#Nullable
#Override
public View onCreateView(#NonNull final LayoutInflater inflater, #Nullable final ViewGroup container, #Nullable Bundle savedInstanceState) {
final View view = inflater.inflate(R.layout.tab1_fragment, container, false);
transfer = (Button) view.findViewById(R.id.button2);
ex = (Exchange) getActivity();
transfer.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
String s = "Test";
ex.stringExchange(s);
}
});
return view;
}
}
With its xlm tab1_fragment.xlm:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="16dp"
android:id="#+id/tab1"
>
<Button
android:id="#+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/transfer"
android:layout_centerInParent="true"/>
</RelativeLayout>
And finally here is the Frag2.java:
package com.example.myapplication;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import java.util.ArrayList;
public class Frag2 extends Fragment {
private static final String TAG = "SecondTab";
private ListView listView;
private ArrayList<String> arrayList = new ArrayList<>();
#Nullable
#Override
public View onCreateView(#NonNull LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.tab2_fragment, container, false);
listView = (ListView) view.findViewById(R.id.list_view);
ArrayAdapter arrayAdapter = new ArrayAdapter(getContext(),android.R.layout.simple_list_item_1,arrayList);
listView.setAdapter(arrayAdapter);
return view;
}
public void displayExchange(String s){
arrayList.add(s);
}
}
I think the problem is in MainActivity when I call findFragmentByTag("SecondTab") because it's tag is not set to SecondTab but i don't know how to set it.
Any help will be apreciated!

Use ViewModel to share data between fragments. Refer: https://developer.android.com/topic/libraries/architecture/viewmodel.html#sharing

I am trying to create a recyclerAdapter inside another recyclerAdapter but my code has a "null object reference" error [duplicate]

This question already has answers here:
What is a NullPointerException, and how do I fix it?
(12 answers)
Closed 4 years ago.
This is the code for the first Recycler Adapter, whenever the 1st button is clicked, it must show the hidden layout containing the other recycler adapter. Both recycler adapters get their data from an arraylist
package com.example.cholomanglicmot.nativechickenandduck.BroodersDirectory;
import android.app.AlertDialog;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.media.Image;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v4.app.DialogFragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
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.HorizontalScrollView;
import android.widget.ImageButton;
import android.widget.TextView;
import android.widget.Toast;
import android.support.v4.app.Fragment;
import com.example.cholomanglicmot.nativechickenandduck.DatabaseHelper;
import com.example.cholomanglicmot.nativechickenandduck.R;
import java.io.Console;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;
public class RecyclerAdapter_Brooder_Pen extends RecyclerView.Adapter<RecyclerAdapter_Brooder_Pen.RecyclerViewHolder> {
ArrayList<Brooders_Pen> arrayList = new ArrayList<>();
//Map<String, ArrayList<String>> brooder_inventory_dictionary = new HashMap<String, ArrayList<String>>();
RecyclerView recyclerView;
RecyclerView.Adapter recycler_adapter;
RecyclerView.LayoutManager layoutManager;
ArrayList<Brooder_Inventory> arrayList2 = new ArrayList<>();
RecyclerAdapter_Brooder_Pen(ArrayList<Brooders_Pen> arrayList, ArrayList<Brooder_Inventory> arrayList2){
this.arrayList = arrayList;
this.arrayList2 = arrayList2;
}
Context context;
#Override
public RecyclerViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.brooder_row_layout,parent, false);
context = parent.getContext();
RecyclerViewHolder recyclerViewHolder = new RecyclerViewHolder(view);
return recyclerViewHolder;
}
#Override
public void onBindViewHolder(#NonNull RecyclerViewHolder holder, final int position) {
final Brooders_Pen broodersPen = arrayList.get(position);
final RecyclerViewHolder holder2 = holder;
holder.brooder_pen_number.setText(broodersPen.getBrooder_pen_number());
holder.brooder_pen_content.setText(broodersPen.getBrooder_pen_content().toString());
holder.brooder_pen_free.setText(broodersPen.getBrooder_pen_free().toString());
holder.brooder_inventory.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
if(holder2.brooder_inventory_layout.getVisibility() == View.VISIBLE){
holder2.brooder_inventory_layout.setVisibility(View.GONE);
}else{
holder2.brooder_inventory_layout.setVisibility(View.VISIBLE);
//THIS IS WHERE I TRY TO CREATE THE RECYCLER ADAPTER FOR THE CURRENT ITEM BUT THE ERROR SAYS "Attempt to invoke virtual method 'void android.support.v7.widget.RecyclerView.setAdapter(android.support.v7.widget.RecyclerView$Adapter)' on a null object reference"
recycler_adapter = new RecyclerAdapter_Brooder_Inventory(arrayList2); //create another recycleradapter
recyclerView.setAdapter(recycler_adapter);
recycler_adapter.notifyDataSetChanged();
}
}
});
holder.brooder_add.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
FragmentActivity activity = (FragmentActivity)(context);
FragmentManager fm = activity.getSupportFragmentManager();
CreateBrooderDialog alertDialog = new CreateBrooderDialog();
alertDialog.show(fm, "CreateBrooderDialog");
}
});
}
#Override
public int getItemCount() {
return arrayList.size();
}
public static class RecyclerViewHolder extends RecyclerView.ViewHolder{
TextView brooder_pen_number;
TextView brooder_pen_content;
TextView brooder_pen_free;
HorizontalScrollView brooder_inventory_layout;
ImageButton brooder_add;
ImageButton brooder_inventory;
RecyclerViewHolder(View view){
super(view);
brooder_pen_number = view.findViewById(R.id.brooder_pen_number);
brooder_pen_content = view.findViewById(R.id.brooder_pen_content);
brooder_pen_free = view.findViewById(R.id.brooder_pen_free);
brooder_inventory_layout = view.findViewById(R.id.brooder_inventory_layout);
brooder_add = view.findViewById(R.id.brooder_add);
brooder_inventory = view.findViewById(R.id.brooder_inventory);
}
}
public void showMessage(String title, String message){
AlertDialog.Builder builder = new AlertDialog.Builder(context);
builder.setCancelable(true);
builder.setTitle(title);
builder.setMessage(message);
builder.show();
}
}
This is the code for the 2nd Recycler adapter that must be created and displayed when the button in the first recycler adapter is pressed
this image is what it must look like when the button for creating another recycler adapter is clicked
package com.example.cholomanglicmot.nativechickenandduck.BroodersDirectory;
import android.app.AlertDialog;
import android.content.Context;
import android.support.annotation.NonNull;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.HorizontalScrollView;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.TextView;
import com.example.cholomanglicmot.nativechickenandduck.DatabaseHelper;
import com.example.cholomanglicmot.nativechickenandduck.R;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;
public class RecyclerAdapter_Brooder_Inventory extends RecyclerView.Adapter<RecyclerAdapter_Brooder_Inventory.RecyclerViewHolder> {
ArrayList<Brooder_Inventory> arrayList2 = new ArrayList<>();
DatabaseHelper myDb;
Map<String, ArrayList<String>> brooder_inventory_dictionary = new HashMap<String, ArrayList<String>>();
RecyclerAdapter_Brooder_Inventory(ArrayList<Brooder_Inventory> arrayList2){
this.arrayList2 = arrayList2;
// this.brooder_inventory_dictionary = brooder_inventory_dictionary;
}
Context context;
#Override
public RecyclerViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.brooder_inventory_row_layout,parent, false);
context = parent.getContext();
RecyclerViewHolder recyclerViewHolder = new RecyclerViewHolder(view);
return recyclerViewHolder;
}
#Override
public void onBindViewHolder(#NonNull RecyclerViewHolder holder, final int position) {
final Brooder_Inventory brooder_inventory = arrayList2.get(position); //nakuha mo na kung anong brooder_inventory ka
final RecyclerViewHolder holder2 = holder;
holder.brooder_inventory_code.setText(brooder_inventory.getBrooder_inv_brooder_id());
}
#Override
public int getItemCount() {
return arrayList2.size();
}
public static class RecyclerViewHolder extends RecyclerView.ViewHolder{
TextView brooder_inventory_code;
TextView brooder_inventory_family;
TextView brooder_inventory_line;
TextView brooder_inventory_gen;
TextView brooder_inventory_batch_date;
TextView brooder_inventory_date_added;
TextView brooder_inventory_last_update;
TextView brooder_inventory_mort;
TextView brooder_inventory_cull;
ImageView brooder_inventory_number_male;
ImageView brooder_inventory_number_female;
ImageView brooder_inventory_total;
RecyclerViewHolder(View view){
super(view);
brooder_inventory_code = view.findViewById(R.id.brooder_inventory_code);
brooder_inventory_family= view.findViewById(R.id.brooder_inventory_family);
brooder_inventory_line = view.findViewById(R.id.brooder_inventory_line);
brooder_inventory_gen = view.findViewById(R.id.brooder_inventory_gen);
brooder_inventory_batch_date = view.findViewById(R.id.brooder_inventory_batch_date);;
brooder_inventory_date_added = view.findViewById(R.id.brooder_inventory_date_added);;
brooder_inventory_last_update = view.findViewById(R.id.brooder_inventory_last_update);;
brooder_inventory_mort = view.findViewById(R.id.brooder_inventory_mort);;
brooder_inventory_cull = view.findViewById(R.id.brooder_inventory_cull);;
brooder_inventory_number_male = view.findViewById(R.id.brooder_inventory_number_male);;
brooder_inventory_number_female = view.findViewById(R.id.brooder_inventory_number_female);;
brooder_inventory_total = view.findViewById(R.id.brooder_inventory_total);;
}
}
}

You have not initialized your RecyclerView recyclerView. The one that is given an adaptor here,
recyclerView.setAdapter(recycler_adapter);
is null.This is why you have your error.
But there are a few more issues at hand. Are you trying to create recyclerviews inside the rows of the outer recyclerview? If so, you need to put a RecyclerView inside each holder. While you are at it, you probably will also have to have a seperate adaptor for each of those recyclerviews so you should add that to the holder as well or attach new ones in onCreateViewHolder().

same jobid in systemuid exception

I am trying to create a grid view that loads images using an adapter.
I used Universal Image Loader for this purpose. When I run this, I get the error, "java.lang.IllegalStateException: Same jobid in systemuid."
I am unable to figure out as to what is the reason for this error. I am new to android development. Thanks in advance!
GridImageAdapter.java
package com.example.android.tabswithswipes.Utils;
import android.content.Context;
import android.graphics.Bitmap;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.ProgressBar;
import com.example.android.tabswithswipes.R;
import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.assist.FailReason;
import com.nostra13.universalimageloader.core.listener.ImageLoadingListener;
import java.util.ArrayList;
/**
* Created by Chaitanya Shiva on 12-05-2018.
*/
public class GridImageAdapter extends ArrayAdapter<String>{
private Context mContext;
private LayoutInflater mInflater;
private int layoutResource;
private String mAppend;
private ArrayList<String> imgURLs;
public GridImageAdapter(Context context, int layoutResource, String append, ArrayList<String> imgURLs) {
super(context, layoutResource, imgURLs);
mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
mContext = context;
this.layoutResource = layoutResource;
mAppend = append;
this.imgURLs = imgURLs;
}
private static class ViewHolder{
ImageView image;
ProgressBar mProgressBar;
}
#NonNull
#Override
public View getView(int position, #Nullable View convertView, #NonNull ViewGroup parent) {
/*
Viewholder build pattern (Similar to recyclerview)
*/
final ViewHolder holder;
if(convertView == null){
convertView = mInflater.inflate(layoutResource, parent, false);
holder = new ViewHolder();
holder.mProgressBar = (ProgressBar) convertView.findViewById(R.id.gridImageProgressBar);
holder.image = (ImageView) convertView.findViewById(R.id.gridImageView);
convertView.setTag(holder);
}
else{
holder = (ViewHolder) convertView.getTag();
}
String imgURL = getItem(position);
ImageLoader imageLoader = ImageLoader.getInstance();
imageLoader.displayImage(mAppend + imgURL, holder.image, new ImageLoadingListener() {
#Override
public void onLoadingStarted(String imageUri, View view) {
if(holder.mProgressBar != null){
holder.mProgressBar.setVisibility(View.VISIBLE);
}
}
#Override
public void onLoadingFailed(String imageUri, View view, FailReason failReason) {
if(holder.mProgressBar != null){
holder.mProgressBar.setVisibility(View.GONE);
}
}
#Override
public void onLoadingComplete(String imageUri, View view, Bitmap loadedImage) {
if(holder.mProgressBar != null){
holder.mProgressBar.setVisibility(View.GONE);
}
}
#Override
public void onLoadingCancelled(String imageUri, View view) {
if(holder.mProgressBar != null){
holder.mProgressBar.setVisibility(View.GONE);
}
}
});
return convertView;
}
}
The activity that uses gridView,
GalleryActivity.java
package com.example.android.tabswithswipes;
import android.app.ActionBar;
import android.app.Activity;
import android.content.Context;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.ProgressBar;
import android.widget.Spinner;
import android.widget.TextView;
import com.example.android.tabswithswipes.Utils.GridImageAdapter;
import com.example.android.tabswithswipes.Utils.UniversalImageLoader;
import com.nostra13.universalimageloader.core.ImageLoader;
import java.util.ArrayList;
/**
* Created by Chaitanya Shiva on 08-05-2018.
*/
public class GalleryFragment extends Activity {
private GridView gridView;
private ImageView galleryImage;
private ProgressBar mProgressBar;
private Spinner directorySpinner;
private Context mContext = GalleryFragment.this;
#Override
protected void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_gallery);
galleryImage = (ImageView)findViewById(R.id.galleryImageView);
gridView = (GridView)findViewById(R.id.gridView);
directorySpinner = (Spinner)findViewById(R.id.spinnerDirectory);
mProgressBar = (ProgressBar)findViewById(R.id.progressBar);
mProgressBar.setVisibility(View.GONE);
ImageView closeGallery = (ImageView)findViewById(R.id.closeGallery);
closeGallery.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
finish();
}
});
TextView nextScreen = (TextView) findViewById(R.id.tvNext);
nextScreen.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
}
});
tempGridSetup();
}
private void setUpImageGrid(ArrayList<String> imgURLs){
GridView gridView = (GridView)findViewById(R.id.gridView);
GridImageAdapter adapter = new GridImageAdapter(mContext, R.layout.layout_grid_imageview,"", imgURLs);
gridView.setAdapter(adapter);
}
private void tempGridSetup(){
ArrayList<String> imgURLs = new ArrayList<>();
imgURLs.add("https://www.gstatic.com/webp/gallery/4.sm.jpg");
imgURLs.add("https://www.gstatic.com/webp/gallery3/1.sm.png");
imgURLs.add("https://cdn.pixabay.com/photo/2018/05/10/09/07/bleeding-heart-3387085_1280.jpg");
imgURLs.add("https://images.idgesg.net/images/article/2017/08/android_robot_logo_by_ornecolorada_cc0_via_pixabay1904852_wide-100732483-large.jpg");
imgURLs.add("https://www.androidcentral.com/sites/androidcentral.com/files/styles/xlarge_wm_brw/public/article_images/2018/03/android-p-logo-pixel-2-xl-5.jpg?itok=DB93lUGS");
imgURLs.add("https://www.androidcentral.com/sites/androidcentral.com/files/styles/xlarge_wm_brw/public/article_images/2018/03/android-p-virtual-notch.jpg?itok=EnKJzDgF");
imgURLs.add("https://www.androidcentral.com/sites/androidcentral.com/files/styles/xlarge_wm_brw/public/article_images/2018/03/samsung-galaxy-s9-plus-black-4.jpg?itok=bTitZlS_");
imgURLs.add("https://www.extremetech.com/wp-content/uploads/2017/03/smiling-android.jpg");
imgURLs.add("https://rimblogs.files.wordpress.com/2016/04/marshmallowman.png?w=800");
imgURLs.add("https://www.androidcentral.com/sites/androidcentral.com/files/topic_images/2015/android-apps-topic.png");
imgURLs.add("https://images.idgesg.net/images/article/2017/11/android-security-100741557-large.jpg");
setUpImageGrid(imgURLs);
}
}

using bitmap with custom spinner

I used this tutorial to make a custom spinner but now I'm having a java.lang.OutOfMemoryError: Failed to allocate a 95976012 byte allocation with 16777120 free bytes and 31MB until OOMerror. I am aware that I should use bitmaps I just don't know how to include the bitmapFactory in my CustomAdapter. I have already compressed my images to sizes less than 16kb and put them in the mipmap folder because they are icons. I have also already tried
<application
android:largeHeap="true"
</application>
Here's my code :
MainActivity.java
package com.kathure.flags;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
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.Toolbar;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.AdapterView;
import android.widget.ImageView;
import android.widget.Spinner;
import android.widget.Toast;
import static android.R.attr.id;
import static android.graphics.BitmapFactory.*;
import static java.security.AccessController.getContext;
public class MainActivity extends AppCompatActivity implements AdapterView.OnItemSelectedListener {
String[] countryNames= {
"Kenya" , "Malawi", "Nigeria", "Rwanda", "Tanzania", "Uganda"
};
int [] flags = {
R.mipmap.kenyamin,R.mipmap.malawimin, R.mipmap.nigeriamin, R.mipmap.rwandamin, R.mipmap.tanzaniamin, R.mipmap.ugandamin
};
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
//Getting the instance of Spinner and applying OnItemSelectedListener on it
Spinner spin = (Spinner) findViewById(R.id.simpleSpinner);
spin.setOnItemSelectedListener(this);
CustomAdapter customAdapter=new CustomAdapter(getApplicationContext(),flags,countryNames);
spin.setAdapter(customAdapter);
}
#Override
public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
Toast.makeText(getApplicationContext(), countryNames[i], Toast.LENGTH_LONG).show();
}
#Override
public void onNothingSelected(AdapterView<?> adapterView) {
}
}
CustomAdapter.java
package com.kathure.flags;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;
/**
* Created by kathure on 28/09/16.
*/
public class CustomAdapter extends BaseAdapter {
Context context;
int flags[];
String[] countryNames;
LayoutInflater inflter;
public CustomAdapter(Context applicationContext, int[] flags, String[] countryNames) {
this.context = applicationContext;
this.flags = flags;
this.countryNames = countryNames;
inflter = (LayoutInflater.from(applicationContext));
}
#Override
public int getCount() {
return flags.length;
}
#Override
public Object getItem(int i) {
return null;
}
#Override
public long getItemId(int i) {
return 0;
}
#Override
public View getView(int i, View view, ViewGroup viewGroup) {
view = inflter.inflate(R.layout.custom_spinner_items, null);
ImageView icon = (ImageView) view.findViewById(R.id.imageView);
TextView names = (TextView) view.findViewById(R.id.textView);
icon.setImageResource(flags[i]);
names.setText(countryNames[i]);
return view;
}
}