Develop Reference

How to pass image using Image Id in intent to different activity?

I am trying to learn to create a meme generator app. First I had a problem with my app crashing when I clicked on the images in the grid view as the images were too big. I was advised to use image id to pass the image to the second activity. I (thought, I) changed the code accordingly. Now when clicked on the image, I can see the next activity with enter top and bottom text options but still image does not appear. I know the problem is the way I am passing image id but don't know what. I hope you can give me specific code as I am very new to programming.
I know using uri also is an option but being a beginner I am not sure how I would execute that here. If you think it is a better (in terms of speed of the app and memory usage / easier to learn and execute), you would be kind enough to help me out with the code too, would be appreciated.
Thank You in advance!
Here is my code:
Main Activity.java
package com.javatechig.gridviewexample;
import android.content.Intent;
import android.content.res.TypedArray;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.GridView;
import java.util.ArrayList;
public class MainActivity extends ActionBarActivity {
private GridView gridView;
private GridViewAdapter gridAdapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
gridView = (GridView) findViewById(R.id.gridView);
gridAdapter = new GridViewAdapter(this, R.layout.grid_item_layout, getData());
gridView.setAdapter(gridAdapter);
gridView.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
ImageItem item = (ImageItem) parent.getItemAtPosition(position);
//Create intent
Intent intent = new Intent(MainActivity.this, DetailsActivity.class);
intent.putExtra("id", item.getId());
//Start details activity
startActivity(intent);
}
});
}
/**
* Prepare some dummy data for gridview
*/
private ArrayList<ImageItem> getData() {
final ArrayList<ImageItem> imageItems = new ArrayList<>();
TypedArray imgs = getResources().obtainTypedArray(R.array.image_ids);
for (int i = 0; i < imgs.length(); i++) {
Bitmap bitmap = BitmapFactory.decodeResource(getResources(), imgs.getResourceId(i, -1));
imageItems.add(new ImageItem(bitmap, R.array.image_ids));
}
return imageItems;
}
}
DetailsActivity.java
package com.javatechig.gridviewexample;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.widget.ImageView;
public class DetailsActivity extends ActionBarActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.details_activity);
//imageUri = Uri.parse(extras.getString("imageUri"));
Bitmap bitmap = getIntent().getParcelableExtra("id");
ImageView imageView = (ImageView) findViewById(R.id.image);
imageView.setImageBitmap(bitmap);
}
}
ImageItem.java
package com.javatechig.gridviewexample;
import android.graphics.Bitmap;
public class ImageItem {
private Bitmap image;
private int id;
public ImageItem(Bitmap image, int id) {
super();
this.image = image;
this.id = id;
}
public Bitmap getImage() {
return image;
}
public void setImage(Bitmap image) {
this.image = image;
}
public int getId(){
return id;
}
public void setId(int id){
this.id = id;
}
}
GridViewAdapter.java
package com.javatechig.gridviewexample;
import android.app.Activity;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import java.util.ArrayList;
public class GridViewAdapter extends ArrayAdapter<ImageItem> {
private Context context;
private int layoutResourceId;
private ArrayList<ImageItem> data = new ArrayList<ImageItem>();
public GridViewAdapter(Context context, int layoutResourceId, ArrayList<ImageItem> data) {
super(context, layoutResourceId, data);
this.layoutResourceId = layoutResourceId;
this.context = context;
this.data = data;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
View row = convertView;
ViewHolder holder;
if (row == null) {
LayoutInflater inflater = ((Activity) context).getLayoutInflater();
row = inflater.inflate(layoutResourceId, parent, false);
holder = new ViewHolder();
holder.image = (ImageView) row.findViewById(R.id.image);
row.setTag(holder);
} else {
holder = (ViewHolder) row.getTag();
}
ImageItem item = data.get(position);
holder.image.setImageBitmap(item.getImage());
return row;
}
static class ViewHolder {
ImageView image;
}
}

There are a few issues with your code. To start, you are obtaining your images from the resources but when you create a new ImageItem and add it to the ArrayList you are not passing in the individual resource ID. Here is the relevant part of your getData() method:
TypedArray imgs = getResources().obtainTypedArray(R.array.image_ids);
for (int i = 0; i < imgs.length(); i++) {
Bitmap bitmap = BitmapFactory.decodeResource(getResources(), imgs.getResourceId(i, -1));
//Here you are putting in the generic R.array.image_ids
//Instead you should put in the images specific id: imgs.getResourceId(i, -1));
imageItems.add(new ImageItem(bitmap, R.array.image_ids));
}
Next, you are incorrectly passing and retrieving data between Activities. Here's your relevant code:
Intent intent = new Intent(MainActivity.this, DetailsActivity.class);
intent.putExtra("id", item.getId()); //You are putting in an int extra
...
//You are attempting to retrieve a Parcelable extra even though you only
//passed in an int
Bitmap bitmap = getIntent().getParcelableExtra("id");
And finally, I want to make it clear that you are not storing these ImageItems anywhere, so, you wouldn't be able to retrieve the correct ImageItem with the ID to get the image.
So, what's the solution?
As you may know Bitmaps can be quite large and passing them between Activities isn't the best approach as there can be many issues in doing so. One way of getting around this is storing them in a File and retrieving that same File in the other Activity. Fortunately, all of the Bitmaps you need are already stored in your resources, so, you can just get them from there.
First, fix your getData() method:
private ArrayList<ImageItem> getData() {
final ArrayList<ImageItem> imageItems = new ArrayList<>();
TypedArray imgs = getResources().obtainTypedArray(R.array.image_ids);
try{
for (int i = 0; i < imgs.length(); i++) {
Bitmap bitmap = BitmapFactory.decodeResource(getResources(), imgs.getResourceId(i, -1));
imageItems.add(new ImageItem(bitmap, imgs.getResourceId(i, -1)));
}
}finally{
imgs.recycle(); //When done recycle your TypedArray
}
return imageItems;
}
Then, your onCreate() method in DetailsActivity:
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.details_activity);
Intent intent = getIntent();
int id = intent.getIntExtra("id", -1);
if(id != -1){
//We have the resource ID so we can retreive the item
Bitmap bitmap = BitmapFactory.decodeResource(getResources(), id);
ImageView imageView = (ImageView) findViewById(R.id.image);
imageView.setImageBitmap(bitmap);
}else{
//We don't have the resource ID so show default View or perform task
}
}

item.getId() is the unique ID in memory , not the image's resource ID, you should use resource ID.
the simple way , you can set resource ID as imageItems ID in setgetData().

How do I create an interactive GridView using Picasso for Android?

Hi I'm trying to create a GridView using images from an online depository using Picasso.
I also want the user to be able to click on the image and it load up full screen to view.
So far I have managed to get it working almost perfectly. The only problem is the image that shows when they click on the grid is not the one that they clicked on, in fact it randomly chooses an image each time.
I was hoping somebody could take a look at my code and tell me where I am going wrong.
Thanks.
So this is my MainActivity class:
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.GridView;
public class MainActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
GridView gv = (GridView) findViewById(R.id.grid_view);
gv.setAdapter(new GridViewAdapter(this));
gv.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View v,
int position, long id) {
// Sending image id to FullScreenActivity
Intent i = new Intent(getApplicationContext(), FullImageActivity.class);
// passing array index
i.putExtra("id", position);
startActivity(i);
}
});
}
}
This is my GridView class:
import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import com.squareup.picasso.Picasso;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import static android.widget.ImageView.ScaleType.CENTER_CROP;
final class GridViewAdapter extends BaseAdapter {
final Context context;
final List<String> urls = new ArrayList<String>();
public GridViewAdapter(Context context) {
this.context = context;
// Ensure we get a different ordering of images on each run.
Collections.addAll(urls, Info.URLS);
Collections.shuffle(urls);
// Triple up the list.
ArrayList<String> copy = new ArrayList<String>(urls);
urls.addAll(copy);
urls.addAll(copy);
}
#Override public View getView(int position, View convertView, ViewGroup parent) {
SquaredImageView view = (SquaredImageView) convertView;
if (view == null) {
view = new SquaredImageView(context);
view.setScaleType(CENTER_CROP);
}
// Get the image URL for the current position.
String url = getItem(position);
// Trigger the download of the URL asynchronously into the image view.
Picasso.with(context) //
.load(url) //
.placeholder(R.drawable.placeholder) //
.error(R.drawable.error) //
.fit() //
.into(view);
return view;
}
#Override public int getCount() {
return urls.size();
}
#Override public String getItem(int position) {
return urls.get(position);
}
#Override public long getItemId(int position) {
return position;
}
}
And finally my FullScreen Class:
import com.squareup.picasso.Picasso;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.ImageView;
public class FullImageActivity extends Activity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.full_image);
// get intent data
Intent i = getIntent();
// Selected image id
int position = i.getExtras().getInt("id");
GridViewAdapter ia = new GridViewAdapter(this);
ImageView iv = (ImageView) findViewById(R.id.full_image_view);
Picasso.with(this) //
.load(ia.getItem(position)) //
.placeholder(R.drawable.placeholder) //
.error(R.drawable.error) //
.fit()
.centerCrop()//
.into(iv);
}
}

I believe this is your culprit:
Collections.addAll(urls, Info.URLS);
Collections.shuffle(urls); // this reshuffles on every new instance
GridViewAdapter ia = new GridViewAdapter(this); // your full screen activity is creating a new instance.
Since I cannot comment yet, the answer is No. When you say startActivity, it will create a new instance of the FullScreenActivity, and then in that FullScreenActivity you are also instantiating a new Adapter which in turn does the shuffle work.
Please put in a breakpoint if you are in doubt.

You reinitialized the adapter for whatever reason here GridViewAdapter ia = new GridViewAdapter(this); That's when the shuffling occurs, in the constructor.
You should not have an adapter in your 2nd Activity. Adapters are for lists. You should simply pass that Activity the image URL.
GridView gv = (GridView) findViewById(R.id.grid_view);
GridViewAdapter adapter = new GridViewAdapter(this);
gv.setAdapter(adapter);
gv.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View v,
int position, long id) {
// Sending image url to FullScreenActivity
Intent i = new Intent(getApplicationContext(), FullImageActivity.class);
i.putExtra("url", adapter.getItem(position));
startActivity(i);
}
});
and
public class FullImageActivity extends Activity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.full_image);
// get intent data
Intent i = getIntent();
string url = i.getExtras().getString("url");
ImageView iv = (ImageView) findViewById(R.id.full_image_view);
Picasso.with(this) //
.load(url) //
.placeholder(R.drawable.placeholder) //
.error(R.drawable.error) //
.fit()
.centerCrop()//
.into(iv);
}
}

You are creating an adapter twice - once in MainActivity, second time in FullImageActivity. Each time it is created shuffled, that's the reason. Nice copy-paste from Picasso sample btw ;)

Custom arrayadapter showing duplicates only when scrolling fast

I got my listview working almost good enough. When I scroll fast up OR down it shows the same 3-4 pictures every time, which slowly turn into the right image.
Code to retrieve bitmap that I think needs fixing
public Bitmap retrieveBitmap(String url) throws Exception {
InputStream inputStream = null;
try {
inputStream = this.retrieveStream(url);
BitmapFactory.Options options = new BitmapFactory.Options();
options.inSampleSize = 8;
final Bitmap bitmap = BitmapFactory.decodeStream(inputStream, null, options);
return bitmap;
} finally {
try {
if (inputStream != null) {
inputStream.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
Before I added the options sample size it kept crashing as I scrolled, I just copied this off another stack question but am not sure what exactly it is doing besides reducing the size somehow.
Adapter class
package com.example.jdmb;
import java.util.ArrayList;
import android.app.Activity;
import android.content.Context;
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 MoviesAdapter extends ArrayAdapter<Movies> {
private ArrayList<Movies> movieData;
private Activity context;
public MoviesAdapter(Context context, int resource,
ArrayList<Movies> objects) {
super(context, resource, objects);
this.context = (Activity) context;
this.movieData = objects;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
View view = convertView;
ViewHolder holder;
if (view == null) {
LayoutInflater vi = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = vi.inflate(R.layout.list_row, parent, false);
holder = new ViewHolder();
holder.id = (TextView) view.findViewById(R.id.movieId);
holder.title = (TextView) view.findViewById(R.id.movieTitle);
holder.vote_avg = (TextView) view.findViewById(R.id.movieAvg);
holder.backdrop_path = (ImageView) view
.findViewById(R.id.movieBackdrop);
holder.release_date = (TextView) view
.findViewById(R.id.movieRelease);
holder.original_title = (TextView) view
.findViewById(R.id.movieTitle2);
holder.vote_count = (TextView) view.findViewById(R.id.movieCount);
holder.adult = (TextView) view.findViewById(R.id.movieAdult);
holder.poster = (ImageView) view.findViewById(R.id.moviePoster);
holder.popularity = (TextView) view
.findViewById(R.id.moviePopularity);
view.setTag(holder);
} else {
holder = (ViewHolder) view.getTag();
}
Movies movie = movieData.get(position);
if (movie != null) {
// check to see if each individual textview is null.
// if not, assign some text!
holder.id.setText("id: " + movie.getId());
holder.title.setText("title: " + movie.getTitle());
holder.vote_avg.setText("vote_avg: " + movie.getVote_average());
DownloadBitmap.downloadBitmap(holder.backdrop_path,
movie.getBackdrop_path());
holder.release_date.setText("release_date: "
+ movie.getRelease_date());
holder.original_title.setText("original_title: "
+ movie.getOriginal_title());
holder.vote_count.setText("vote_count: " + movie.getVote_count());
holder.adult.setText("adult: " + movie.isAdult());
DownloadBitmap
.downloadBitmap(holder.poster, movie.getPoster_path());
holder.popularity.setText("popularity: " + movie.getPopularity());
}
return view;
}
private static class ViewHolder {
TextView id;
TextView title;
TextView vote_avg;
ImageView backdrop_path;
TextView release_date;
TextView original_title;
TextView vote_count;
TextView adult;
ImageView poster;
TextView popularity;
}
}
Downloader class
package com.example.jdmb;
import java.io.InputStream;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.BitmapFactory.Options;
import android.os.AsyncTask;
import android.widget.ImageView;
public class DownloadBitmap {
static Bitmap image;
public static void downloadBitmap(final ImageView imageView,
final String url) {
new AsyncTask<Bitmap, Void, Bitmap>() {
#Override
protected Bitmap doInBackground(Bitmap... params) {
HttpRetriever retriever = new HttpRetriever();
try {
image = retriever.retrieveBitmap(url);
} catch (Exception e) {
}
return image;
}
#Override
protected void onPostExecute(Bitmap result) {
super.onPostExecute(result);
if (imageView != null) {
imageView.setImageBitmap(result);
}
}
}.execute();
}
}
What part of my code is making me see the same photos when scrolling, I think it has something to do with recycling the images, but not sure how to get past it.

The recycled ImageView shows that last bitmap you told it to. You either need to set the holder.backdrop_path & holder.poster to a generic resource before returning the view or in onPreExecute of your AsyncTask.
Like this:
package com.example.jdmb;
import java.io.InputStream;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.widget.ImageView;
public class DownloadBitmap {
static Bitmap image;
public static void downloadBitmap(final ImageView imageView,
final String url) {
new AsyncTask<Bitmap, Void, Bitmap>() {
protected void onPreExecute(){
//This could also be an internal resource instead of null
imageView.setImageBitmap(null);
}
#Override
protected Bitmap doInBackground(Bitmap... params) {
HttpRetriever retriever = new HttpRetriever();
InputStream is = retriever.retrieveStream(url);
image = BitmapFactory.decodeStream(is);
return image;
}
#Override
protected void onPostExecute(Bitmap result) {
super.onPostExecute(result);
imageView.setImageBitmap(result);
}
}.execute();
}
}
I would recommend a much more robust way of accomplishing this task. This solution will require you to use the Volley Library and the majority of this code can be found in the Google IO source. Here is a video covering the same topic if it helps.
Download Volley and add it to your build path.
We are going to uses the Google IO super class of the Volley ImageLoader.
*
* Copyright 2012 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.android.apps.iosched.util;
import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.annotation.TargetApi;
import android.content.Context;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.ColorDrawable;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.TransitionDrawable;
import android.net.http.AndroidHttpClient;
import android.os.Build;
import android.os.Environment;
import android.support.v4.app.FragmentActivity;
import android.widget.ImageView;
import com.android.volley.Cache;
import com.android.volley.Network;
import com.android.volley.RequestQueue;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.BasicNetwork;
import com.android.volley.toolbox.DiskBasedCache;
import com.android.volley.toolbox.HttpClientStack;
import com.android.volley.toolbox.HurlStack;
import java.io.File;
import java.util.ArrayList;
/**
* A class that wraps up remote image loading requests using the Volley library combined with a
* memory cache. An single instance of this class should be created once when your Activity or
* Fragment is created, then use {#link #get(String, android.widget.ImageView)} or one of
* the variations to queue the image to be fetched and loaded from the network. Loading images
* in a {#link android.widget.ListView} or {#link android.widget.GridView} is also supported but
* you must store the {#link com.android.volley.Request} in your ViewHolder type class and pass it
* into loadImage to ensure the request is canceled as views are recycled.
*/
public class ImageLoader extends com.android.volley.toolbox.ImageLoader {
private static final ColorDrawable transparentDrawable = new ColorDrawable(
android.R.color.transparent);
private static final int HALF_FADE_IN_TIME = UIUtils.ANIMATION_FADE_IN_TIME / 2;
private static final String CACHE_DIR = "images";
private Resources mResources;
private ArrayList<Drawable> mPlaceHolderDrawables;
private boolean mFadeInImage = true;
private int mMaxImageHeight = 0;
private int mMaxImageWidth = 0;
/**
* Creates an ImageLoader with Bitmap memory cache. No default placeholder image will be shown
* while the image is being fetched and loaded.
*/
public ImageLoader(FragmentActivity activity) {
super(newRequestQueue(activity),
BitmapCache.getInstance(activity.getSupportFragmentManager()));
mResources = activity.getResources();
}
/**
* Creates an ImageLoader with Bitmap memory cache and a default placeholder image while the
* image is being fetched and loaded.
*/
public ImageLoader(FragmentActivity activity, int defaultPlaceHolderResId) {
super(newRequestQueue(activity),
BitmapCache.getInstance(activity.getSupportFragmentManager()));
mResources = activity.getResources();
mPlaceHolderDrawables = new ArrayList<Drawable>(1);
mPlaceHolderDrawables.add(defaultPlaceHolderResId == -1 ?
null : mResources.getDrawable(defaultPlaceHolderResId));
}
/**
* Creates an ImageLoader with Bitmap memory cache and a list of default placeholder drawables.
*/
public ImageLoader(FragmentActivity activity, ArrayList<Drawable> placeHolderDrawables) {
super(newRequestQueue(activity),
BitmapCache.getInstance(activity.getSupportFragmentManager()));
mResources = activity.getResources();
mPlaceHolderDrawables = placeHolderDrawables;
}
/**
* Starts processing requests on the {#link RequestQueue}.
*/
public void startProcessingQueue() {
getRequestQueue().start();
}
/**
* Stops processing requests on the {#link RequestQueue}.
*/
public void stopProcessingQueue() {
getRequestQueue().stop();
}
public ImageLoader setFadeInImage(boolean fadeInImage) {
mFadeInImage = fadeInImage;
return this;
}
public ImageLoader setMaxImageSize(int maxImageWidth, int maxImageHeight) {
mMaxImageWidth = maxImageWidth;
mMaxImageHeight = maxImageHeight;
return this;
}
public ImageLoader setMaxImageSize(int maxImageSize) {
return setMaxImageSize(maxImageSize, maxImageSize);
}
public ImageContainer get(String requestUrl, ImageView imageView) {
return get(requestUrl, imageView, 0);
}
public ImageContainer get(String requestUrl, ImageView imageView, int placeHolderIndex) {
return get(requestUrl, imageView, mPlaceHolderDrawables.get(placeHolderIndex),
mMaxImageWidth, mMaxImageHeight);
}
public ImageContainer get(String requestUrl, ImageView imageView, Drawable placeHolder) {
return get(requestUrl, imageView, placeHolder, mMaxImageWidth, mMaxImageHeight);
}
public ImageContainer get(String requestUrl, ImageView imageView, Drawable placeHolder,
int maxWidth, int maxHeight) {
// Find any old image load request pending on this ImageView (in case this view was
// recycled)
ImageContainer imageContainer = imageView.getTag() != null &&
imageView.getTag() instanceof ImageContainer ?
(ImageContainer) imageView.getTag() : null;
// Find image url from prior request
String recycledImageUrl = imageContainer != null ? imageContainer.getRequestUrl() : null;
// If the new requestUrl is null or the new requestUrl is different to the previous
// recycled requestUrl
if (requestUrl == null || !requestUrl.equals(recycledImageUrl)) {
if (imageContainer != null) {
// Cancel previous image request
imageContainer.cancelRequest();
imageView.setTag(null);
}
if (requestUrl != null) {
// Queue new request to fetch image
imageContainer = get(requestUrl,
getImageListener(mResources, imageView, placeHolder, mFadeInImage),
maxWidth, maxHeight);
// Store request in ImageView tag
imageView.setTag(imageContainer);
} else {
imageView.setImageDrawable(placeHolder);
imageView.setTag(null);
}
}
return imageContainer;
}
private static ImageListener getImageListener(final Resources resources,
final ImageView imageView, final Drawable placeHolder, final boolean fadeInImage) {
return new ImageListener() {
#Override
public void onResponse(ImageContainer response, boolean isImmediate) {
imageView.setTag(null);
if (response.getBitmap() != null) {
setImageBitmap(imageView, response.getBitmap(), resources,
fadeInImage && !isImmediate);
} else {
imageView.setImageDrawable(placeHolder);
}
}
#Override
public void onErrorResponse(VolleyError volleyError) {
}
};
}
private static RequestQueue newRequestQueue(Context context) {
// On HC+ use HurlStack which is based on HttpURLConnection. Otherwise fall back on
// AndroidHttpClient (based on Apache DefaultHttpClient) which should no longer be used
// on newer platform versions where HttpURLConnection is simply better.
Network network = new BasicNetwork(
UIUtils.hasHoneycomb() ?
new HurlStack() :
new HttpClientStack(AndroidHttpClient.newInstance(
NetUtils.getUserAgent(context))));
Cache cache = new DiskBasedCache(getDiskCacheDir(context, CACHE_DIR));
RequestQueue queue = new RequestQueue(cache, network);
queue.start();
return queue;
}
/**
* Sets a {#link android.graphics.Bitmap} to an {#link android.widget.ImageView} using a
* fade-in animation. If there is a {#link android.graphics.drawable.Drawable} already set on
* the ImageView then use that as the image to fade from. Otherwise fade in from a transparent
* Drawable.
*/
#TargetApi(Build.VERSION_CODES.HONEYCOMB_MR1)
private static void setImageBitmap(final ImageView imageView, final Bitmap bitmap,
Resources resources, boolean fadeIn) {
// If we're fading in and on HC MR1+
if (fadeIn && UIUtils.hasHoneycombMR1()) {
// Use ViewPropertyAnimator to run a simple fade in + fade out animation to update the
// ImageView
imageView.animate()
.scaleY(0.95f)
.scaleX(0.95f)
.alpha(0f)
.setDuration(imageView.getDrawable() == null ? 0 : HALF_FADE_IN_TIME)
.setListener(new AnimatorListenerAdapter() {
#Override
public void onAnimationEnd(Animator animation) {
imageView.setImageBitmap(bitmap);
imageView.animate()
.alpha(1f)
.scaleY(1f)
.scaleX(1f)
.setDuration(HALF_FADE_IN_TIME)
.setListener(null);
}
});
} else if (fadeIn) {
// Otherwise use a TransitionDrawable to fade in
Drawable initialDrawable;
if (imageView.getDrawable() != null) {
initialDrawable = imageView.getDrawable();
} else {
initialDrawable = transparentDrawable;
}
BitmapDrawable bitmapDrawable = new BitmapDrawable(resources, bitmap);
// Use TransitionDrawable to fade in
final TransitionDrawable td =
new TransitionDrawable(new Drawable[] {
initialDrawable,
bitmapDrawable
});
imageView.setImageDrawable(td);
td.startTransition(UIUtils.ANIMATION_FADE_IN_TIME);
} else {
// No fade in, just set bitmap directly
imageView.setImageBitmap(bitmap);
}
}
/**
* Get a usable cache directory (external if available, internal otherwise).
*
* #param context The context to use
* #param uniqueName A unique directory name to append to the cache dir
* #return The cache dir
*/
public static File getDiskCacheDir(Context context, String uniqueName) {
// Check if media is mounted or storage is built-in, if so, try and use external cache dir
// otherwise use internal cache dir
// TODO: getCacheDir() should be moved to a background thread as it attempts to create the
// directory if it does not exist (no disk access should happen on the main/UI thread).
final String cachePath =
Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState()) ||
!Environment.isExternalStorageRemovable()
? getExternalCacheDir(context).getPath()
: context.getCacheDir().getPath();
return new File(cachePath + File.separator + uniqueName);
}
/**
* Get the external app cache directory.
*
* #param context The context to use
* #return The external cache dir
*/
private static File getExternalCacheDir(Context context) {
// TODO: This needs to be moved to a background thread to ensure no disk access on the
// main/UI thread as unfortunately getExternalCacheDir() calls mkdirs() for us (even
// though the Volley library will later try and call mkdirs() as well from a background
// thread).
return context.getExternalCacheDir();
}
/**
* Interface an activity can implement to provide an ImageLoader to its children fragments.
*/
public interface ImageLoaderProvider {
public ImageLoader getImageLoaderInstance();
}
}
Now in your Activity Create the ImageLoader and pass it to you adapter when you create your adapter.
#Override
public void onCreate(Bundle savedInstanceState){
...
ImageLoader mImageLoader = new ImageLoader(this, R.drawable.default_image);
MoviesAdapter mMoviesAdapter = new MoviesAdapter(this, R.layout.your_list_layout, moviesList, mImageLoader);
...
}
Adjust your Movie Adapter constructor.
package com.example.jdmb;
import java.util.ArrayList;
import android.app.Activity;
import android.content.Context;
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 MoviesAdapter extends ArrayAdapter<Movies> {
private ArrayList<Movies> movieData;
private Activity context;
private ImageLoader mImageLoader;
public MoviesAdapter(Context context, int resource,
ArrayList<Movies> objects, ImageLoader loader) {
super(context, resource, objects);
this.context = (Activity) context;
this.movieData = objects;
this.mImageLoader = loader;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
View view = convertView;
ViewHolder holder;
if (view == null) {
LayoutInflater vi = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = vi.inflate(R.layout.list_row, parent, false);
holder = new ViewHolder();
holder.id = (TextView) view.findViewById(R.id.movieId);
holder.title = (TextView) view.findViewById(R.id.movieTitle);
holder.vote_avg = (TextView) view.findViewById(R.id.movieAvg);
holder.backdrop_path = (ImageView) view
.findViewById(R.id.movieBackdrop);
holder.release_date = (TextView) view
.findViewById(R.id.movieRelease);
holder.original_title = (TextView) view
.findViewById(R.id.movieTitle2);
holder.vote_count = (TextView) view.findViewById(R.id.movieCount);
holder.adult = (TextView) view.findViewById(R.id.movieAdult);
holder.poster = (ImageView) view.findViewById(R.id.moviePoster);
holder.popularity = (TextView) view
.findViewById(R.id.moviePopularity);
view.setTag(holder);
} else {
holder = (ViewHolder) view.getTag();
}
Movies movie = movieData.get(position);
if (movie != null) {
// check to see if each individual textview is null.
// if not, assign some text!
holder.id.setText("id: " + movie.getId());
holder.title.setText("title: " + movie.getTitle());
holder.vote_avg.setText("vote_avg: " + movie.getVote_average());
mImageLoader.get(movie.getBackdrop_path(), holder.backdrop_path);
holder.release_date.setText("release_date: "
+ movie.getRelease_date());
holder.original_title.setText("original_title: "
+ movie.getOriginal_title());
holder.vote_count.setText("vote_count: " + movie.getVote_count());
holder.adult.setText("adult: " + movie.isAdult());
mImageLoader.get(movie.getPoster_path(), holder.poster);
holder.popularity.setText("popularity: " + movie.getPopularity());
}
return view;
}
private static class ViewHolder {
TextView id;
TextView title;
TextView vote_avg;
ImageView backdrop_path;
TextView release_date;
TextView original_title;
TextView vote_count;
TextView adult;
ImageView poster;
TextView popularity;
}
}
I may have missed something or made typing mistakes as I did not directly test this but I am using a similar implementation in one of my own apps.

NullPointerException accessing Intent Bundle

I have this code on my app which have 3 tab with 3 different Activity. One is this but i cant resolve this problem:
package com.example.myapplication;
import android.content.Intent;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;
import com.example.myapplication.universalimageloader.AbsListViewBaseActivity;
import com.example.myapplication.universalimageloader.Constants;
import com.example.myapplication.universalimageloader.ImagePagerActivity;
import com.nostra13.universalimageloader.core.DisplayImageOptions;
public class Foto extends AbsListViewBaseActivity {
String[] imageUrls;
DisplayImageOptions options;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.ac_image_grid);
Bundle bundle = getIntent().getExtras();
imageUrls = bundle.getStringArray(Constants.Extra.IMAGES);
options = new DisplayImageOptions.Builder()
.showStubImage(R.drawable.ic_stub)
.showImageForEmptyUri(R.drawable.ic_empty)
.showImageOnFail(R.drawable.ic_error)
.cacheInMemory()
.cacheOnDisc()
.bitmapConfig(Bitmap.Config.RGB_565)
.build();
listView = (GridView) findViewById(R.id.gridview);
((GridView) listView).setAdapter(new ImageAdapter());
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
startImagePagerActivity(position);
}
});
}
private void startImagePagerActivity(int position) {
Intent intent = new Intent(this, ImagePagerActivity.class);
intent.putExtra(Constants.Extra.IMAGES, imageUrls);
intent.putExtra(Constants.Extra.IMAGE_POSITION, position);
startActivity(intent);
}
public class ImageAdapter extends BaseAdapter {
#Override
public int getCount() {
return imageUrls.length;
}
#Override
public Object getItem(int position) {
return null;
}
#Override
public long getItemId(int position) {
return position;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
final ImageView imageView;
if (convertView == null) {
imageView = (ImageView) getLayoutInflater().inflate(R.layout.item_grid_image, parent, false);
} else {
imageView = (ImageView) convertView;
}
imageLoader.displayImage(imageUrls[position], imageView, options);
return imageView;
}
}
runc correctly but when i click on this tab i have a NullPointerException on
imageUrls = bundle.getStringArray(Constants.Extra.IMAGES);
can anyone help me?
Intent Foto= new Intent().setClass(this, Foto.class);
TabSpec Foto= tabHost.newTabSpec("Foto")
.setIndicator("Foto")
.setContent(Foto);
but i think the problem is this but i dont know where:
public final class Constants {
public static final String[] IMAGES = new String[] {
// Heavy images
"https://lh6.googleusercontent.com/-jZgveEqb6pg/T3R4kXScycI/AAAAAAAAAE0/xQ7CvpfXDzc/s1024/sample_image_01.jpg",
"https://lh4.googleusercontent.com/-K2FMuOozxU0/T3R4lRAiBTI/AAAAAAAAAE8/a3Eh9JvnnzI/s1024/sample_image_02.jpg",
"https://lh5.googleusercontent.com/-SCS5C646rxM/T3R4l7QB6xI/AAAAAAAAAFE/xLcuVv3CUyA/s1024/sample_image_03.jpg",
"https://lh6.googleusercontent.com/-f0NJR6-_Thg/T3R4mNex2wI/AAAAAAAAAFI/45oug4VE8MI/s1024/sample_image_04.jpg",
"https://lh3.googleusercontent.com/-n-xcJmiI0pg/T3R4mkSchHI/AAAAAAAAAFU/EoiNNb7kk3A/s1024/sample_image_05.jpg",
"https://lh3.googleusercontent.com/-X43vAudm7f4/T3R4nGSChJI/AAAAAAAAAFk/3bna6D-2EE8/s1024/sample_image_06.jpg",
"https://lh5.googleusercontent.com/-MpZneqIyjXU/T3R4nuGO1aI/AAAAAAAAAFg/r09OPjLx1ZY/s1024/sample_image_07.jpg",
"https://lh6.googleusercontent.com/-ql3YNfdClJo/T3XvW9apmFI/AAAAAAAAAL4/_6HFDzbahc4/s1024/sample_image_08.jpg",
"https://lh5.googleusercontent.com/-Pxa7eqF4cyc/T3R4oasvPEI/AAAAAAAAAF0/-uYDH92h8LA/s1024/sample_image_09.jpg",
"https://lh4.googleusercontent.com/-Li-rjhFEuaI/T3R4o-VUl4I/AAAAAAAAAF8/5E5XdMnP1oE/s1024/sample_image_10.jpg",
"https://lh5.googleusercontent.com/-_HU4fImgFhA/T3R4pPVIwWI/AAAAAAAAAGA/0RfK_Vkgth4/s1024/sample_image_11.jpg",
"https://lh6.googleusercontent.com/-0gnNrVjwa0Y/T3R4peGYJwI/AAAAAAAAAGU/uX_9wvRPM9I/s1024/sample_image_12.jpg",
"https://lh3.googleusercontent.com/-HBxuzALS_Zs/T3R4qERykaI/AAAAAAAAAGQ/_qQ16FaZ1q0/s1024/sample_image_13.jpg",
"https://lh4.googleusercontent.com/-cKojDrARNjQ/T3R4qfWSGPI/AAAAAAAAAGY/MR5dnbNaPyY/s1024/sample_image_14.jpg",
"https://lh3.googleusercontent.com/-WujkdYfcyZ8/T3R4qrIMGUI/AAAAAAAAAGk/277LIdgvnjg/s1024/sample_image_15.jpg",
"https://lh6.googleusercontent.com/-FMHR7Vy3PgI/T3R4rOXlEKI/AAAAAAAAAGs/VeXrDNDBkaw/s1024/sample_image_16.jpg",
"https://lh4.googleusercontent.com/-mrR0AJyNTH0/T3R4rZs6CuI/AAAAAAAAAG0/UE1wQqCOqLA/s1024/sample_image_17.jpg",
"https://lh6.googleusercontent.com/-z77w0eh3cow/T3R4rnLn05I/AAAAAAAAAG4/BaerfWoNucU/s1024/sample_image_18.jpg",
"https://lh5.googleusercontent.com/-aWVwh1OU5Bk/T3R4sAWw0yI/AAAAAAAAAHE/4_KAvJttFwA/s1024/sample_image_19.jpg",
"https://lh6.googleusercontent.com/-q-js52DMnWQ/T3R4tZhY2sI/AAAAAAAAAHM/A8kjp2Ivdqg/s1024/sample_image_20.jpg",
"https://lh5.googleusercontent.com/-_jIzvvzXKn4/T3R4t7xpdVI/AAAAAAAAAHU/7QC6eZ10jgs/s1024/sample_image_21.jpg",
"https://lh3.googleusercontent.com/-lnGi4IMLpwU/T3R4uCMa7vI/AAAAAAAAAHc/1zgzzz6qTpk/s1024/sample_image_22.jpg",
"https://lh5.googleusercontent.com/-fFCzKjFPsPc/T3R4u0SZPFI/AAAAAAAAAHk/sbgjzrktOK0/s1024/sample_image_23.jpg",
"https://lh4.googleusercontent.com/-8TqoW5gBE_Y/T3R4vBS3NPI/AAAAAAAAAHs/EZYvpNsaNXk/s1024/sample_image_24.jpg",
"https://lh6.googleusercontent.com/-gc4eQ3ySdzs/T3R4vafoA7I/AAAAAAAAAH4/yKii5P6tqDE/s1024/sample_image_25.jpg",
"https://lh5.googleusercontent.com/--NYOPCylU7Q/T3R4vjAiWkI/AAAAAAAAAH8/IPNx5q3ptRA/s1024/sample_image_26.jpg",
"https://lh6.googleusercontent.com/-9IJM8so4vCI/T3R4vwJO2yI/AAAAAAAAAIE/ljlr-cwuqZM/s1024/sample_image_27.jpg",
"https://lh4.googleusercontent.com/-KW6QwOHfhBs/T3R4w0RsQiI/AAAAAAAAAIM/uEFLVgHPFCk/s1024/sample_image_28.jpg",
"https://lh4.googleusercontent.com/-z2557Ec1ctY/T3R4x3QA2hI/AAAAAAAAAIk/9-GzPL1lTWE/s1024/sample_image_29.jpg",
"https://lh5.googleusercontent.com/-LaKXAn4Kr1c/T3R4yc5b4lI/AAAAAAAAAIY/fMgcOVQfmD0/s1024/sample_image_30.jpg",
"https://lh4.googleusercontent.com/-F9LRToJoQdo/T3R4yrLtyQI/AAAAAAAAAIg/ri9uUCWuRmo/s1024/sample_image_31.jpg",
"https://lh4.googleusercontent.com/-6X-xBwP-QpI/T3R4zGVboII/AAAAAAAAAIs/zYH4PjjngY0/s1024/sample_image_32.jpg",
"https://lh5.googleusercontent.com/-VdLRjbW4LAs/T3R4zXu3gUI/AAAAAAAAAIw/9aFp9t7mCPg/s1024/sample_image_33.jpg",
"https://lh6.googleusercontent.com/-gL6R17_fDJU/T3R4zpIXGjI/AAAAAAAAAI8/Q2Vjx-L9X20/s1024/sample_image_34.jpg",
"https://lh3.googleusercontent.com/-1fGH4YJXEzo/T3R40Y1B7KI/AAAAAAAAAJE/MnTsa77g-nk/s1024/sample_image_35.jpg",
"https://lh4.googleusercontent.com/-Ql0jHSrea-A/T3R403mUfFI/AAAAAAAAAJM/qzI4SkcH9tY/s1024/sample_image_36.jpg",
"https://lh5.googleusercontent.com/-BL5FIBR_tzI/T3R41DA0AKI/AAAAAAAAAJk/GZfeeb-SLM0/s1024/sample_image_37.jpg",
"https://lh4.googleusercontent.com/-wF2Vc9YDutw/T3R41fR2BCI/AAAAAAAAAJc/JdU1sHdMRAk/s1024/sample_image_38.jpg",
"https://lh6.googleusercontent.com/-ZWHiPehwjTI/T3R41zuaKCI/AAAAAAAAAJg/hR3QJ1v3REg/s1024/sample_image_39.jpg",
// Light images
"http://tabletpcssource.com/wp-content/uploads/2011/05/android-logo.png",
"http://simpozia.com/pages/images/stories/windows-icon.png",
"https://si0.twimg.com/profile_images/1135218951/gmail_profile_icon3_normal.png",
"http://www.krify.net/wp-content/uploads/2011/09/Macromedia_Flash_dock_icon.png",
"http://radiotray.sourceforge.net/radio.png",
"http://www.bandwidthblog.com/wp-content/uploads/2011/11/twitter-logo.png",
"http://weloveicons.s3.amazonaws.com/icons/100907_itunes1.png",
"http://weloveicons.s3.amazonaws.com/icons/100929_applications.png",
"http://www.idyllicmusic.com/index_files/get_apple-iphone.png",
"http://www.frenchrevolutionfood.com/wp-content/uploads/2009/04/Twitter-Bird.png",
"http://3.bp.blogspot.com/-ka5MiRGJ_S4/TdD9OoF6bmI/AAAAAAAAE8k/7ydKtptUtSg/s1600/Google_Sky%2BMaps_Android.png",
"http://www.desiredsoft.com/images/icon_webhosting.png",
"http://goodereader.com/apps/wp-content/uploads/downloads/thumbnails/2012/01/hi-256-0-99dda8c730196ab93c67f0659d5b8489abdeb977.png",
"http://1.bp.blogspot.com/-mlaJ4p_3rBU/TdD9OWxN8II/AAAAAAAAE8U/xyynWwr3_4Q/s1600/antivitus_free.png",
"http://cdn3.iconfinder.com/data/icons/transformers/computer.png",
"http://cdn.geekwire.com/wp-content/uploads/2011/04/firefox.png?7794fe",
"https://ssl.gstatic.com/android/market/com.rovio.angrybirdsseasons/hi-256-9-347dae230614238a639d21508ae492302340b2ba",
"http://androidblaze.com/wp-content/uploads/2011/12/tablet-pc-256x256.jpg",
"http://www.theblaze.com/wp-content/uploads/2011/08/Apple.png",
"http://1.bp.blogspot.com/-y-HQwQ4Kuu0/TdD9_iKIY7I/AAAAAAAAE88/3G4xiclDZD0/s1600/Twitter_Android.png",
"http://3.bp.blogspot.com/-nAf4IMJGpc8/TdD9OGNUHHI/AAAAAAAAE8E/VM9yU_lIgZ4/s1600/Adobe%2BReader_Android.png",
"http://cdn.geekwire.com/wp-content/uploads/2011/05/oovoo-android.png?7794fe",
"http://icons.iconarchive.com/icons/kocco/ndroid/128/android-market-2-icon.png",
"http://thecustomizewindows.com/wp-content/uploads/2011/11/Nicest-Android-Live-Wallpapers.png",
"http://c.wrzuta.pl/wm16596/a32f1a47002ab3a949afeb4f",
"http://macprovid.vo.llnwd.net/o43/hub/media/1090/6882/01_headline_Muse.jpg",
// Special cases
"file:///sdcard/Universal Image Loader ##&=+-_.,!()~'%20.png", // Image from SD card with encoded symbols
"assets://Living Things ##&=+-_.,!()~'%20.jpg", // Image from assets
"drawable://" + R.drawable.ic_launcher, // Image from drawables
"https://www.eff.org/sites/default/files/chrome150_0.jpg", // Image from HTTPS
"http://bit.ly/soBiXr", // Redirect link
"http://img001.us.expono.com/100001/100001-1bc30-2d736f_m.jpg", // EXIF
"", // Empty link
"http://wrong.site.com/corruptedLink", // Wrong link
};
private Constants() {
}
public static class Config {
public static final boolean DEVELOPER_MODE = false;
}
public static class Extra {
public static final String IMAGES = "com.example.myapplication.universalimageloader.IMAGES";
public static final String IMAGE_POSITION = "com.example.myapplication.universalimageloader.IMAGE_POSITION";
}
}

Why do you pass the array of images (IMAGES) as an extra? You can access it from everywhere because it is a ...
public static final
....variable.
Just change this....
imageUrls = bundle.getStringArray(Constants.Extra.IMAGES);
For this....
imageUrls = Constants.IMAGES;
...or dont even use imageUrls and access the images all the time through Constants.IMAGES.
You dont need a bundle and put Extras.
Anyway in case you want to pass extras...
Intent i = new Intent(context, YourActivity.class);
i.putExtra("key",/*value you wanna pass*/);
startActivity(i);
And when you get the values, try always to check if the bundle is null...
Bundle bundle = getIntent().getExtras();
if(bundle!=null){
//Get the values in the bundle
}

values arent being passed to intent

Stack Trace
Picture of stack trace here
Values aren't being passed to the other intent. Every time I try to start the activity with the intent in it, it crashes.
//This activity will retrieve and display the different rewards that are available.
public class RewardsActivity extends Activity {
#Override
public void onCreate(Bundle SavedInstanceState)
{
super.onCreate(SavedInstanceState);
setContentView(R.layout.rewards);
//stores retrieves and stores the current gridview
GridView gridView = (GridView)findViewById(R.id.grid_view);
//Instance of ImageAdapter class that will load the images into the gridview
gridView.setAdapter(new ImageAdapter(this));
//This function is used to set a listener on each item in the grid so that when its clicked it will go to the other view.
gridView.setOnItemClickListener(new OnItemClickListener(){
public void onItemClick(AdapterView<?> parent, View v,int position, long id)
{
Intent i = new Intent(getApplicationContext(),RewardsViewActivity.class);
i.putExtra("id", position);
startActivity(i);
}
});
}
This new intent is being passed to, when it's passed here it is stored in a variable then used in a ImageView to load an image.
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.ImageView;
public class RewardsViewActivity extends Activity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.full_view);
// get intent data
Intent i = getIntent();
// Selected image id
int position = i.getExtras().getInt("id");
ImageAdapter imageAdapter = new ImageAdapter(this);
ImageView imageView = (ImageView) findViewById(R.id.full_image);
imageView.setImageResource(imageAdapter.finalImages[position]);
}
}
ImageAdapter.java
package org.android.pps;
import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;
/*This class will be used handle the loading of the image view that will display all the
images of the rewards. (this will be used along with RewardsActivity and rewards.xml)
*/
public class ImageAdapter extends BaseAdapter {
//variable that will store the current context of the application
private Context c;
private Integer num = 6;
private int[] rewards_num=new int[num];
private Integer[] Images = new Integer[6];
public Integer[] finalImages;
//for loop will set the correct image to the array if its either activated or deactivated
public Integer[] fillImageArray()
{
//Array that will be used to show the reward images
Integer[] Activated ={
R.drawable.rewards1,
R.drawable.rewards2,
R.drawable.rewards3,
R.drawable.rewards4,
R.drawable.rewards5,
R.drawable.rewards6,
};
Integer[] Deactivated ={
R.drawable.rewards1b,
R.drawable.rewards2b,
R.drawable.rewards3b,
R.drawable.rewards4b,
R.drawable.rewards5b,
R.drawable.rewards6b,
};
//for loop that checks to see all the rewards that a particular users has to assign a particular image.
for(int x = 0;x<rewards_num.length;x++)
{
for(int y = 0;y<6;y++)
{
if(rewards_num[x]==y)
{
Images[x]=Activated[y];
}
else
{
Images[x]=Deactivated[y];
}
}
}
return Images;
}
//constructor with the context being passed.
public ImageAdapter(Context m)
{
c = m;
}
public int getCount() {
return 6;
}
public Object getItem(int position) {
return Images[position];
}
public long getItemId(int position) {
return 0;
}
// The function View create a new ImageView for each item that is being referenced by the Adapter
public View getView(int position, View convertView, ViewGroup parent) {
finalImages = fillImageArray();
ImageView imageView = new ImageView(c);
imageView.setImageResource(finalImages[position]);
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
imageView.setLayoutParams(new GridView.LayoutParams(300, 300));
return imageView;
}
}

finalImages in noi initialized there .........
it is finalImages in the getview which is not get called in 2nd activity (RewardsViewActivity )...........
if possible move this line to constructor finalImages = fillImageArray();