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      1 /*
      2  * Copyright (C) 2014 Google Inc. All Rights Reserved.
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.example.android.wearable.speedtracker.ui;
     18 
     19 import android.content.Context;
     20 import android.support.wearable.view.WearableListView;
     21 import android.view.LayoutInflater;
     22 import android.view.View;
     23 import android.view.ViewGroup;
     24 import android.widget.TextView;
     25 
     26 import com.example.android.wearable.speedtracker.R;
     27 
     28 /**
     29  * A {@link android.support.wearable.view.WearableListView.Adapter} that is used to populate the
     30  * list of speeds.
     31  */
     32 public class SpeedPickerListAdapter extends WearableListView.Adapter {
     33 
     34     private int[] mDataSet;
     35     private final Context mContext;
     36     private final LayoutInflater mInflater;
     37 
     38     public SpeedPickerListAdapter(Context context, int[] dataset) {
     39         mContext = context;
     40         mInflater = LayoutInflater.from(context);
     41         mDataSet = dataset;
     42     }
     43 
     44     public static class ItemViewHolder extends WearableListView.ViewHolder {
     45 
     46         private TextView mTextView;
     47 
     48         public ItemViewHolder(View itemView) {
     49             super(itemView);
     50             // find the text view within the custom item's layout
     51             mTextView = (TextView) itemView.findViewById(R.id.name);
     52         }
     53     }
     54 
     55     /**
     56      * Create new views for list items (invoked by the WearableListView's layout manager)
     57      */
     58     @Override
     59     public WearableListView.ViewHolder onCreateViewHolder(ViewGroup parent,
     60             int viewType) {
     61         // Inflate our custom layout for list items
     62         return new ItemViewHolder(mInflater.inflate(R.layout.speed_picker_item_layout, null));
     63     }
     64 
     65     /**
     66      * Replaces the contents of a list item. Instead of creating new views, the list tries to
     67      * recycle existing ones. This is invoked by the WearableListView's layout manager.
     68      */
     69     @Override
     70     public void onBindViewHolder(WearableListView.ViewHolder holder,
     71             int position) {
     72         // retrieve the text view
     73         ItemViewHolder itemHolder = (ItemViewHolder) holder;
     74         TextView view = itemHolder.mTextView;
     75         // replace text contents
     76         view.setText(mContext.getString(R.string.speed_for_list, mDataSet[position]));
     77         // replace list item's metadata
     78         holder.itemView.setTag(position);
     79     }
     80 
     81     /**
     82      * Return the size of the data set (invoked by the WearableListView's layout manager).
     83      */
     84     @Override
     85     public int getItemCount() {
     86         return mDataSet.length;
     87     }
     88 
     89 }
     90