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- import android.content.Context;
- import android.database.Cursor;
- import android.net.Uri;
- import android.support.v7.widget.CardView;
- import android.support.v7.widget.RecyclerView;
- import android.view.LayoutInflater;
- import android.view.View;
- import android.view.ViewGroup;
- import android.widget.ImageView;
- import android.widget.TextView;
- import com.squareup.picasso.Picasso;
- import java.util.Random;
- public class RVAdapter extends RecyclerViewCursorAdapter<RVAdapter.ProductViewHolder>
- {
- private static final String TAG = RVAdapter.class.getSimpleName();
- private final Context mContext;
- private final Random mRandom;
- public RVAdapter(Context context, String locationSetting)
- {
- super(null);
- mContext = context;
- mRandom = new Random(System.currentTimeMillis());
- // Sort order: Ascending, by date.
- String sortOrder = ProductContract.ProductEntry.COLUMN_DATE + " ASC";
- Uri productForLocationUri = ProductContract.ProductEntry
- .buildProductLocationWithStartDate(locationSetting, System.currentTimeMillis());
- // Students: Uncomment the next lines to display what what you stored in the bulkInsert
- Cursor cursor = mContext.getContentResolver()
- .query(productForLocationUri, null, null, null, sortOrder);
- swapCursor(cursor);
- }
- @Override
- public ProductViewHolder onCreateViewHolder(ViewGroup parent, int viewType)
- {
- View view = LayoutInflater.from(parent.getContext())
- .inflate(R.layout.item, parent, false);
- return new ProductViewHolder(view);
- }
- @Override
- protected void onBindViewHolder(ProductViewHolder holder, Cursor cursor)
- {
- String imagePath = cursor.getString(ShopFragment.COL_PRODUCT_IMAGE);
- String price = cursor.getString(ShopFragment.COL_PRODUCT_PRICE);
- holder.productPrice.setText("US $" + price);
- int height = mRandom.nextInt(50) + 500;
- //Download image using picasso library
- Picasso.with(mContext)
- .load(imagePath)
- .resize(500, height)
- .error(R.drawable.placeholder)
- .placeholder(R.drawable.placeholder)
- .into(holder.productPhoto);
- }
- public static class ProductViewHolder extends RecyclerView.ViewHolder
- {
- CardView cv;
- TextView productPrice;
- ImageView productPhoto;
- ProductViewHolder(View itemView)
- {
- super(itemView);
- cv = (CardView) itemView.findViewById(R.id.cv);
- productPrice = (TextView) itemView.findViewById(R.id.product_price);
- productPhoto = (ImageView) itemView.findViewById(R.id.product_photo);
- }
- }
- }
- import android.database.Cursor;
- import android.database.DataSetObserver;
- import android.support.v7.widget.RecyclerView;
- import android.view.ViewGroup;
- /**
- * RecyclerView CursorAdapter
- * <p>
- * Created by Simon on 28/02/2016.
- */
- public abstract class RecyclerViewCursorAdapter<VH extends RecyclerView.ViewHolder> extends
- RecyclerView.Adapter<VH>
- {
- private Cursor mCursor;
- private boolean mDataValid;
- private int mRowIDColumn;
- public RecyclerViewCursorAdapter(Cursor cursor)
- {
- setHasStableIds(true);
- swapCursor(cursor);
- }
- public abstract VH onCreateViewHolder(ViewGroup parent, int viewType);
- protected abstract void onBindViewHolder(VH holder, Cursor cursor);
- @Override
- public void onBindViewHolder(VH holder, int position)
- {
- if(!mDataValid){
- throw new IllegalStateException("this should only be called when the cursor is valid");
- }
- if(!mCursor.moveToPosition(position)){
- throw new IllegalStateException("couldn't move cursor to position " + position);
- }
- onBindViewHolder(holder, mCursor);
- }
- @Override
- public long getItemId(int position)
- {
- if(mDataValid && mCursor != null && mCursor.moveToPosition(position)){
- return mCursor.getLong(mRowIDColumn);
- }
- return RecyclerView.NO_ID;
- }
- @Override
- public int getItemCount()
- {
- if(mDataValid && mCursor != null){
- return mCursor.getCount();
- }
- else{
- return 0;
- }
- }
- protected Cursor getCursor()
- {
- return mCursor;
- }
- public void changeCursor(Cursor cursor)
- {
- Cursor old = swapCursor(cursor);
- if(old != null){
- old.close();
- }
- }
- public Cursor swapCursor(Cursor newCursor)
- {
- if(newCursor == mCursor){
- return null;
- }
- Cursor oldCursor = mCursor;
- if(oldCursor != null){
- if(mDataSetObserver != null){
- oldCursor.unregisterDataSetObserver(mDataSetObserver);
- }
- }
- mCursor = newCursor;
- if(newCursor != null){
- if(mDataSetObserver != null){
- newCursor.registerDataSetObserver(mDataSetObserver);
- }
- mRowIDColumn = newCursor.getColumnIndexOrThrow("_id");
- mDataValid = true;
- notifyDataSetChanged();
- }
- else{
- mRowIDColumn = -1;
- mDataValid = false;
- notifyDataSetChanged();
- }
- return oldCursor;
- }
- private DataSetObserver mDataSetObserver = new DataSetObserver()
- {
- @Override
- public void onChanged()
- {
- mDataValid = true;
- notifyDataSetChanged();
- }
- @Override
- public void onInvalidated()
- {
- mDataValid = false;
- notifyDataSetChanged();
- }
- };
- }
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