Cache Images with Volley

I'm trying to implement Image Caching into my app. The code i currently have regarding the images is below:

Network call to get images:

public void getImage(String url, final ImageView imageView) {

    System.out.println("Image Url is: " + url);
    ImageRequest requestImage = new ImageRequest(url, new Response.Listener<Bitmap>() {
        @Override
        public void onResponse(Bitmap response) {
            imageView.setImageBitmap(response);
        }
    }, 0, 0, null, null);

    queue.add(requestImage);
}

How could I implement the caching? I have read a few articles on SO, but am not sure on how to implement it into my app?

Thanks for your help

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What is the best way to fetch data from site in android?

I want to develop an android app for a site. I have following options:

1. A Native Android Application
2. A HTML 5 rendered on the Web view built into a Native app
3. Throw in some Responsive Design into the front-end of your Web-app with HTML 5 and JavaScript.

I don't have access to the database. The site is given, what I need to do is to fetch data from site and displays it with listview, textView and imageview. Here I think I have a few options too: 1. Use a parser 2. Use rss feed.

I am confused about these two options. Please suggest me any better idea.

P.S. : I know the question is too broad, and can be downvoted.

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Auto-moving image on drag listener

I set a drag listener to an ImageView in my app, but when I click it, I don't want it to center the image based on where I pressed. It does this:

http://ift.tt/1IjkGXw

Basically, if I press on bottom right of the image, it takes where I press as central point and moves image's center point on that exact location. But I don't want it to do that. If I press on bottom right , it shouldn't auto move itself and I can drag the image from that point. I don't think any code is necessary but just in case:

@Override
public boolean onDrag(View v, DragEvent event) {
    switch (event.getAction()) {
        // Signal for the start of drag and drop operation
        case DragEvent.ACTION_DRAG_STARTED: {
            // do nothing
            break;
        }
        // The drag point has entered the bounding box of the View
        case DragEvent.ACTION_DRAG_ENTERED: {
            // do nothing
            break;
        }
        // The user has moved the drag shadow outside the bounding box of the view
        case DragEvent.ACTION_DRAG_EXITED: {
            // do nothing
            break;
        }
        // Drag shadow has been released, the drag point is within the bounding box of the view
        case DragEvent.ACTION_DROP: {
            // Get the image and its position
            ImageView view = (ImageView) event.getLocalState();
            int position = (int) view.getTag(R.id.piece_position);

            /**
             * If it is dropped on the left pane, remove it from its parent and also
             * remove the bitmap at the position and notify the adapter.
             * Add it to the left pane and set the position.
             */
            if (v == puzzlePane) {
                ViewGroup viewgroup = (ViewGroup) view.getParent();
                viewgroup.removeView(view);

                if (position != -1) {
                    pieces.remove(position);
                    mAdapter.notifyDataSetChanged();
                }

                FrameLayout containView = (FrameLayout) v;
                containView.addView(view);
                view.setVisibility(View.VISIBLE);
                view.setTag(R.id.piece_state, "left");
                view.setTag(R.id.piece_position, -1);
                view.setOnLongClickListener(null);
                view.setOnTouchListener(mAdapter);
            } else {
                view.setVisibility(View.VISIBLE);
                view.setTag(R.id.piece_state, "right");
                view.setOnTouchListener(null);
                view.setOnLongClickListener(mAdapter);
            }

            Log.d(MyDragListener.class.getSimpleName(), view.getTag(R.id.piece_state) + "");

            view.setX(event.getX() - (view.getWidth() / 2));
            view.setY(event.getY() - (view.getHeight() / 2));

            break;
        }
        // The drag and drop operation has concluded
        case DragEvent.ACTION_DRAG_ENDED: {
            // do nothing
            break;
        }
    }
    return true;
}

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RecyclerView.Adapter get item position of my list

I have created a RecyclerView.Adapter and I want to fill a list.. so my problem now is I don't know how to implement the get position of my list.

below you can see my code:

public class RecyclerViewAdapter extends RecyclerView.Adapter {

List<Result> _contents;

public RecyclerViewAdapter(List<Result> contents) {
    this._contents = contents;
}


@Override
public int getItemCount() {
    return _contents.size();
}

@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int position) {
    View view = null;
    view = LayoutInflater.from(parent.getContext())
            .inflate(R.layout.list_item_card_small, parent, false);

    Result tempResult = _contents.get(position);

    TextView temp = (TextView) view.findViewById(R.id.text_city_name);
    temp.setText(tempResult.getInfo().getCity().getName());

    return new RecyclerView.ViewHolder(view) {
    };
}

@Override
public long getItemId(int position) {
    return position;
}

@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {

   }
}

so the function onCreateViewHolder doesn't get properly the id is always the same id.. how can I fix this or implement to get the right position of mi list?¿ What it´s happening now is the list has the right number of items but is always the same item, the fist one. I guess it´s something simple but I cant figure out how to implement it.

Thanks!!

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Android: Hmac SHA512 in java

I have the following code in php:

$binKey = pack("H*", $keyTest);
$hmac = strtoupper(hash_hmac($pbx_hash, $msg, $binKey));

How can i achieve the same in android (java).

I have tried few methods available for hmac sha512 but the result of php snippet is different from that of mine.

Thanks in advance

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notifyDataSetChanged method is not refreshing listview using updated data?

I am using an ArrayAdapter with filterable interface to implement search functionality in a listview.My code for adapter is following:

public class FlightsAdapter extends ArrayAdapter<Flight> implements Filterable {

    List<Flight> flightLists = new ArrayList<Flight>();
    private List<Flight> origFlightList;
    private Context context;
    Flight flight = null;

    public FlightsAdapter(Context context, int textViewResourceId,
            List<Flight> fLists) {
        super(context, textViewResourceId, fLists);
        this.context = context;
        this.flightLists = fLists;
    }

    public void updateFlightList(List<Flight> newData){
        this.flightLists.clear();
        this.flightLists = newData;

    }
public Filter getFilter() {
        return new Filter() {

            @Override
            protected FilterResults performFiltering(CharSequence constraint) {
                final FilterResults oReturn = new FilterResults();
                final List<Flight> results = new ArrayList<Flight>();
                if (origFlightList == null)
                    origFlightList = flightLists;
                if (constraint != null) {
                    if (origFlightList != null && origFlightList.size() > 0) {
                        for (final Flight f : origFlightList) {
                            if (f.getPlace().toLowerCase()
                                    .contains(constraint.toString()))
                                results.add(f);
                        }
                    }
                    oReturn.values = results;
                    oReturn.count = results.size();
                }
                return oReturn;
            }

            @SuppressWarnings("unchecked")
            @Override
            protected void publishResults(CharSequence constraint,
                                          FilterResults results) {
                flightLists = (ArrayList<Flight>) results.values;
                notifyDataSetChanged();
            }
        };
    }

}

getFilter() and publishResults() methods get triggered properly on searching and flightLists get populated with new data but the listview remain same with no items change, I don't know what I am doing wrong in above code, Please help me figure out this problem

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Android TV Emulater is Blank. How can I see apps like Google Play Store and others?

I have started new Android TV Emulator. But it shows nothing except settings and search icon. I am unable to open even Google Play to add more apps.

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