Java tutorial
/* * Copyright (c) 2016 Razeware LLC * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ package pk.edu.ucp.fall16_mad_c; import android.content.Context; import android.util.Log; 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 java.util.ArrayList; import android.graphics.Typeface; public class AdvRecipeAdapter extends BaseAdapter { public static final String TAG = AdvRecipeAdapter.class.getSimpleName(); static int createCount = 0; private Context mContext; private LayoutInflater mInflater; private ArrayList<Recipe> mDataSource; public AdvRecipeAdapter(Context context, ArrayList<Recipe> items) { mContext = context; mDataSource = items; mInflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE); } /** * How many items are in the data set represented by this Adapter. * * @return Count of items. */ @Override public int getCount() { return mDataSource.size(); } /** * Get the data item associated with the specified position in the data set. * * @param position Position of the item whose data we want within the adapter's * data set. * @return The data at the specified position. */ @Override public Object getItem(int position) { return mDataSource.get(position); } /** * Get the row id associated with the specified position in the list. * * @param position The position of the item within the adapter's data set whose row id we want. * @return The id of the item at the specified position. */ @Override public long getItemId(int position) { return position; } /** * Get a View that displays the data at the specified position in the data set. You can either * create a View manually or inflate it from an XML layout file. When the View is inflated, the * parent View (GridView, ListView...) will apply default layout parameters unless you use * {@link LayoutInflater#inflate(int, ViewGroup, boolean)} * to specify a root view and to prevent attachment to the root. * * @param position The position of the item within the adapter's data set of the item whose view * we want. * @param convertView The old view to reuse, if possible. Note: You should check that this view * is non-null and of an appropriate type before using. If it is not possible to convert * this view to display the correct data, this method can create a new view. * Heterogeneous lists can specify their number of view types, so that this View is * always of the right type (see {@link #getViewTypeCount()} and * {@link #getItemViewType(int)}). * @param parent The parent that this view will eventually be attached to * @return A View corresponding to the data at the specified position. */ @Override public View getView(int position, View convertView, ViewGroup parent) { ViewHolder holder; // check if the view already exists if so, no need to inflate and findViewById again! if (convertView == null) { // Inflate the custom row layout from your XML. convertView = mInflater.inflate(R.layout.list_item_complex, parent, false); // create a new "Holder" with subviews holder = new ViewHolder(); holder.thumbnailImageView = (ImageView) convertView.findViewById(R.id.recipe_list_thumbnail); holder.titleTextView = (TextView) convertView.findViewById(R.id.recipe_list_title); holder.subtitleTextView = (TextView) convertView.findViewById(R.id.recipe_list_subtitle); holder.detailTextView = (TextView) convertView.findViewById(R.id.recipe_food_type); // hang onto this holder for future recyclage convertView.setTag(holder); Log.d(TAG, "CreateCount = " + ++createCount); } else { // skip all the expensive inflation/findViewById and just get the holder you already made holder = (ViewHolder) convertView.getTag(); } // Get relevant subviews of row view TextView titleTextView = holder.titleTextView; TextView subtitleTextView = holder.subtitleTextView; TextView detailTextView = holder.detailTextView; ImageView thumbnailImageView = holder.thumbnailImageView; //Get corresponding recipe for row Recipe recipe = (Recipe) getItem(position); // Update row view's textviews to display recipe information titleTextView.setText(recipe.title); subtitleTextView.setText(recipe.description); detailTextView.setText(recipe.foodType); if (position % 2 == 0) { thumbnailImageView.setImageResource(R.drawable.bouncing_ball_00); } else { thumbnailImageView.setImageResource(R.drawable.arrow); } // Style text views Typeface titleTypeFace = Typeface.createFromAsset(mContext.getAssets(), "fonts/JosefinSans-Bold.ttf"); titleTextView.setTypeface(titleTypeFace); Typeface subtitleTypeFace = Typeface.createFromAsset(mContext.getAssets(), "fonts/JosefinSans-SemiBoldItalic.ttf"); subtitleTextView.setTypeface(subtitleTypeFace); Typeface detailTypeFace = Typeface.createFromAsset(mContext.getAssets(), "fonts/Quicksand-Bold.otf"); detailTextView.setTypeface(detailTypeFace); detailTextView.setTextColor(android.support.v4.content.ContextCompat.getColor(mContext, R.color.red)); return convertView; } private static class ViewHolder { public TextView titleTextView; public TextView subtitleTextView; public TextView detailTextView; public ImageView thumbnailImageView; } }