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Attempt to get length of null array - retrieve bitmap image from sqlite DB

I am trying to retrieve an image from an SQLite database. The image is stored as a BLOB and trying to retrieve it using an array. I'm not sure why its doing this. The permissions are all set correctly.
package com.example.joao_.quizathonegroupteamproject.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;
import com.example.joao_.quizathonegroupteamproject.DatabaseClasses.User;
import com.example.joao_.quizathonegroupteamproject.R;
import java.util.ArrayList;
/**
* Created by Quoc Nguyen on 13-Dec-16.
*/
public class UserListAdapter extends BaseAdapter {
private Context context;
private int layout;
private ArrayList<User> foodsList;
public UserListAdapter(Context context, int layout, ArrayList<User> foodsList) {
this.context = context;
this.layout = layout;
this.foodsList = foodsList;
}
#Override
public int getCount() {
return foodsList.size();
}
#Override
public Object getItem(int position) {
return foodsList.get(position);
}
#Override
public long getItemId(int position) {
return position;
}
private class ViewHolder{
ImageView imageView;
}
#Override
public View getView(int position, View view, ViewGroup viewGroup) {
View row = view;
ViewHolder holder = new ViewHolder();
if(row == null){
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
row = inflater.inflate(layout, null);
holder.imageView = (ImageView) row.findViewById(R.id.imgFood);
row.setTag(holder);
}
else {
holder = (ViewHolder) row.getTag();
}
User food = foodsList.get(position);
byte[] tblUsersImage = food.getImage();
Bitmap bitmap = BitmapFactory.decodeByteArray(tblUsersImage, 0, tblUsersImage.length);
holder.imageView.setImageBitmap(bitmap);
return row;
}
}

You can retrieve BLOB image and stored it in Byte array like this:
byte[] array = cursor.getBlob(columnIndex);
Bitmap bitmap = BitmapFactory.decodeByteArray(array, 0 ,array.length);
and then set it into image view
holder.imageView.setImageBitmap(bitmap);

you didn't provide your SQLite database class but i think , your food.getImage(); return null value .
check dataInsert method OR getData in your SQLite db !

caching images from json in listview?

I followed this lesson here which talk about json parsing and image loading in list view the example works good but it has a problem in imageview when scrolling up & down all images reloading so can anyone solve this problem?
this the adapter of listview
package com.wingnity.jsonparsingtutorial;
import java.io.InputStream;
import java.util.ArrayList;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;
public class ActorAdapter extends ArrayAdapter<Actors> {
ArrayList<Actors> actorList;
LayoutInflater vi;
int Resource;
ViewHolder holder;
public ActorAdapter(Context context, int resource, ArrayList<Actors> objects) {
super(context, resource, objects);
vi = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
Resource = resource;
actorList = objects;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
// convert view = design
View v = convertView;
if (v == null) {
holder = new ViewHolder();
v = vi.inflate(Resource, null);
holder.imageview = (ImageView) v.findViewById(R.id.ivImage);
holder.tvName = (TextView) v.findViewById(R.id.tvName);
holder.tvDescription = (TextView) v.findViewById(R.id.tvDescriptionn);
holder.tvDOB = (TextView) v.findViewById(R.id.tvDateOfBirth);
holder.tvCountry = (TextView) v.findViewById(R.id.tvCountry);
holder.tvHeight = (TextView) v.findViewById(R.id.tvHeight);
holder.tvSpouse = (TextView) v.findViewById(R.id.tvSpouse);
holder.tvChildren = (TextView) v.findViewById(R.id.tvChildren);
v.setTag(holder);
} else {
holder = (ViewHolder) v.getTag();
}
holder.imageview.setImageResource(R.drawable.ic_launcher);
new DownloadImageTask(holder.imageview).execute(actorList.get(position).getImage());
holder.tvName.setText(actorList.get(position).getName());
holder.tvDescription.setText(actorList.get(position).getDescription());
holder.tvDOB.setText("B'day: " + actorList.get(position).getDob());
holder.tvCountry.setText(actorList.get(position).getCountry());
holder.tvHeight.setText("Height: " + actorList.get(position).getHeight());
holder.tvSpouse.setText("Spouse: " + actorList.get(position).getSpouse());
holder.tvChildren.setText("Children: " + actorList.get(position).getChildren());
return v;
}
static class ViewHolder {
public ImageView imageview;
public TextView tvName;
public TextView tvDescription;
public TextView tvDOB;
public TextView tvCountry;
public TextView tvHeight;
public TextView tvSpouse;
public TextView tvChildren;
}
private class DownloadImageTask extends AsyncTask<String, Void, Bitmap> {
ImageView bmImage;
public DownloadImageTask(ImageView bmImage) {
this.bmImage = bmImage;
}
protected Bitmap doInBackground(String... urls) {
String urldisplay = urls[0];
Bitmap mIcon = null;
try {
InputStream in = new java.net.URL(urldisplay).openStream();
mIcon = BitmapFactory.decodeStream(in);
} catch (Exception e) {
Log.e("Error", e.getMessage());
e.printStackTrace();
}
return mIcon;
}
protected void onPostExecute(Bitmap result) {
bmImage.setImageBitmap(result);
}
}
}

Used the Android Universal Image-Loader This is best
Declare
private ImageLoader imageLoader1;
On Create
imageLoader1 = ImageLoader.getInstance();
imageLoader1.init(ImageLoaderConfiguration.createDefault(getActivity()));
no_image here a drawable image without any image load in Cache
DisplayImageOptions
options = new DisplayImageOptions.Builder()
.cacheInMemory(true)
.cacheOnDisk(true)
.showImageOnLoading(R.drawable.no_image) // resource or drawable
.showImageForEmptyUri(R.drawable.no_image) // resource or drawable
.showImageOnFail(R.drawable.no_image)
.considerExifParams(true)
.bitmapConfig(Bitmap.Config.RGB_565)
.build();
imageLoader1.displayImage(yourpath.replace(" ", "%20"), ivprofile, options);
You Can Use Piccaso Also and Glide also

here is the code after editing it works like a charm
import java.util.List;
import android.app.Activity;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;
import com.android.volley.toolbox.ImageLoader;
import com.android.volley.toolbox.NetworkImageView;
public class ActorAdapter extends BaseAdapter {
private Activity activity;
private LayoutInflater inflater;
private List<Actors> movieItems;
ImageLoader imageLoader = AppController.getInstance().getImageLoader();
public ActorAdapter(Activity activity, List<Actors> movieItems) {
this.activity = activity;
this.movieItems = movieItems;
}
#Override
public int getCount() {
return movieItems.size();
}
#Override
public Object getItem(int location) {
return movieItems.get(location);
}
#Override
public long getItemId(int position) {
return position;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
if (inflater == null)
inflater = (LayoutInflater) activity
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
if (convertView == null)
convertView = inflater.inflate(R.layout.list_item, null);
if (imageLoader == null)
imageLoader = AppController.getInstance().getImageLoader();
NetworkImageView thumbNail = (NetworkImageView) convertView
.findViewById(R.id.flag);
TextView title = (TextView) convertView.findViewById(R.id.rank);
// getting movie data for the row
Actors m = movieItems.get(position);
// thumbnail image
thumbNail.setImageUrl(m.getImage(), imageLoader);
// title
title.setText(m.getName());
return convertView;
}
}

Implement Custom Gridview in Android [closed]

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Edit the question to include desired behavior, a specific problem or error, and the shortest code necessary to reproduce the problem. This will help others answer the question.
Closed 6 years ago.
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Hi i am new to android development. I have made an app where picture are now shown in a gridview. But i want to make it more user friendly. I have found an example but i need some help to implement my code as the example. I want to write my UserList.java as ImageAdapter.java. I want to use imageview instead of holder. How can i do that??
Example i am trying to follow:
ImageAdapter.java
package com.step2rock.www.photographynowroadtopro;
import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;
/**
* Created by Sushimz on 5/7/2016.
*/
public class ImageAdapter extends BaseAdapter {
private Context mContext;
// Keep all Images in array
public Integer[] mThumbIds = {
R.drawable.pic_1, R.drawable.pic_2,
R.drawable.pic_3, R.drawable.pic_4,
R.drawable.pic_5, R.drawable.pic_6,
// R.drawable.pic_7, R.drawable.pic_8,
// R.drawable.pic_9, R.drawable.pic_10,
// R.drawable.pic_11, R.drawable.pic_12,
// R.drawable.pic_13, R.drawable.pic_14,
// R.drawable.pic_15
};
// Constructor
public ImageAdapter(Context c){
mContext = c;
}
#Override
public int getCount() {
return mThumbIds.length;
}
#Override
public Object getItem(int position) {
return mThumbIds[position];
}
#Override
public long getItemId(int position) {
return 0;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
ImageView imageView = new ImageView(mContext);
imageView.setImageResource(mThumbIds[position]);
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
imageView.setLayoutParams(new GridView.LayoutParams(70, 70));
return imageView;
}
}
Now Here is my code.
UserList.java
package com.step2rock.www.adapter;
import java.util.ArrayList;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.util.Base64;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;
import com.step2rock.www.crudproject.R;
import com.step2rock.www.crudproject.UserlistActivity;
import com.step2rock.www.model.User;
public class UserList extends BaseAdapter {
private Context mContext;
LayoutInflater inflater;
UserlistActivity activity;
ArrayList<User> users;
public UserList(Context context, ArrayList<User> users) {
mContext = context;
inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
this.users = users;
}
#Override
public int getCount() {
return users.size();
}
#Override
public Object getItem(int arg0) {
return null;
}
#Override
public long getItemId(int arg0) {
return 0;
}
static class ViewHolder {
public ImageView ivUserImage;
public TextView tvUserName;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
activity = new UserlistActivity();
if (convertView == null) {
holder = new ViewHolder();
convertView = inflater.inflate(R.layout.userrow_activity, null);
holder.ivUserImage = (ImageView) convertView.findViewById(R.id.ivUserImage);
holder.tvUserName = (TextView) convertView.findViewById(R.id.tvHeader);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
User user = new User();
user = users.get(position);
holder.ivUserImage.setImageBitmap(convertToBitmap(user.get_user_pic()));
holder.tvUserName.setText(user.get_first_name());
return convertView;
}
public Bitmap convertToBitmap(String base64String) {
byte[] decodedString = Base64.decode(base64String, Base64.DEFAULT);
Bitmap bitmapResult = BitmapFactory.decodeByteArray(decodedString, 0, decodedString.length);
return bitmapResult;
}
}

You are new to android and want to create a grid of showing pictures.
You can develop the grid like below Follow this tutorial.

Load selected fields from ArrayList to ListView.

I would like to load only selected fields from my ArrayList to ListView.
I couldn't find that example so I ask.
I have an ArrayList of a structure as follows:
ArrayList<LogInfo> logInfoArray
Where LogInfo class have fields as follows:
public ArrayList<Point[][]> strokes;
public LinkedList<byte[]> codes;
public int[] times; //contains fields of calendar class
I want to put in my ListView in each row selected fields from "times" and "codes"
How can I achieve that? I would like to use a cursor, if possible.

You can use a custom adapter extending from ArrayAdapter to which you can pass the ArrayList<LogInfo> .
You can then ovverride the getView(..) method of the Adapter to set the fields you want in the row of the Listview .
UPDATE
From this example at Android Custom Adapters
import java.util.List;
import android.app.Activity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.TextView;
public class InteractiveArrayAdapter extends ArrayAdapter<LogInfo> {
private final List<LogInfo> list;
private final Activity context;
public InteractiveArrayAdapter(Activity context, List<LogInfo> list) {
super(context, R.layout.rowbuttonlayout, list);
this.context = context;
this.list = list;
}
static class ViewHolder {
protected TextView text1, text2;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
View view = null;
if (convertView == null) {
LayoutInflater inflator = context.getLayoutInflater();
view = inflator.inflate(R.layout.rowbuttonlayout, null);
final ViewHolder viewHolder = new ViewHolder();
viewHolder.text1 = (TextView) view.findViewById(R.id.label1);
viewHolder.text2 = (TextView) view.findViewById(R.id.label2);
view.setTag(viewHolder);
} else {
view = convertView;
}
ViewHolder holder = (ViewHolder) view.getTag();
holder.text1.setText(list.get(position).getName1());
holder.text2.setText(list.get(position).getName2());
return view;
}
}

Android custom Listadapter

I want to let the adapter check if the submitted value is a file
but when I check
it only checks the first value so
for eg.
I submit
app (directory)
meta (directory)
this shoul look like this :
app with the directory icon
meta with the directory icon
but the out put is only app as directory
The adapter:
package org.alexander.fuchs.compress;
import java.io.File;
import android.app.Activity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;
public class adapter extends ArrayAdapter<String> {
private final Activity context;
private final String[] names;
static class ViewHolder {
public TextView text;
public ImageView image;
}
public adapter(Activity context, String[] names) {
super(context, R.layout.rowlayout, names);
this.context = context;
this.names = names;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
View rowView = convertView;
if (rowView == null) {
LayoutInflater inflater = context.getLayoutInflater();
rowView = inflater.inflate(R.layout.rowlayout, null);
ViewHolder viewHolder = new ViewHolder();
viewHolder.text = (TextView) rowView.findViewById(R.id.label);
viewHolder.image = (ImageView) rowView
.findViewById(R.id.icon);
rowView.setTag(viewHolder);
}
ViewHolder holder = (ViewHolder) rowView.getTag();
String s = names[position];
holder.text.setText(s);
File entry = new File(s);
if(entry.isDirectory() == true)
{
holder.image.setImageResource(R.drawable.ok);
}
else
{
holder.image.setImageResource(R.drawable.no);
}
return rowView;
}
}