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      1 /*
      2  * Copyright (C) 2014 The Android Open Source Project
      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.supportv7.widget.adapter;
     18 
     19 import android.content.Context;
     20 import android.graphics.Color;
     21 import android.support.v7.widget.RecyclerView;
     22 import android.util.TypedValue;
     23 import android.view.ViewGroup;
     24 import android.widget.TextView;
     25 
     26 import java.util.ArrayList;
     27 import java.util.Collections;
     28 
     29 public class SimpleStringAdapter extends RecyclerView.Adapter<SimpleStringAdapter.ViewHolder> {
     30 
     31     private int mBackground;
     32 
     33     private ArrayList<String> mValues;
     34 
     35     public static class ViewHolder extends RecyclerView.ViewHolder {
     36         public String mBoundString;
     37         public TextView mTextView;
     38 
     39         public ViewHolder(TextView v) {
     40             super(v);
     41             mTextView = v;
     42         }
     43 
     44         @Override
     45         public String toString() {
     46             return super.toString() + " '" + mTextView.getText();
     47         }
     48     }
     49 
     50     public String getValueAt(int position) {
     51         return mValues.get(position);
     52     }
     53 
     54     public SimpleStringAdapter(Context context, String[] strings) {
     55         TypedValue val = new TypedValue();
     56         if (context.getTheme() != null) {
     57             context.getTheme().resolveAttribute(
     58                     android.R.attr.selectableItemBackground, val, true);
     59         }
     60         mBackground = val.resourceId;
     61         mValues = new ArrayList<String>();
     62         Collections.addAll(mValues, strings);
     63     }
     64 
     65     public void swap(int pos1, int pos2) {
     66         String tmp = mValues.get(pos1);
     67         mValues.set(pos1, mValues.get(pos2));
     68         mValues.set(pos2, tmp);
     69         notifyItemRemoved(pos1);
     70         notifyItemInserted(pos2);
     71     }
     72 
     73     @Override
     74     public SimpleStringAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
     75         final ViewHolder h = new ViewHolder(new TextView(parent.getContext()));
     76         h.mTextView.setMinimumHeight(128);
     77         h.mTextView.setPadding(20, 0, 20, 0);
     78         h.mTextView.setFocusable(true);
     79         h.mTextView.setBackgroundResource(mBackground);
     80         RecyclerView.LayoutParams lp = new RecyclerView.LayoutParams(
     81                 ViewGroup.LayoutParams.WRAP_CONTENT,
     82                 ViewGroup.LayoutParams.WRAP_CONTENT);
     83         lp.leftMargin = 10;
     84         lp.rightMargin = 5;
     85         lp.topMargin = 20;
     86         lp.bottomMargin = 15;
     87         h.mTextView.setLayoutParams(lp);
     88         return h;
     89     }
     90 
     91     @Override
     92     public void onBindViewHolder(ViewHolder holder, int position) {
     93         holder.mBoundString = mValues.get(position);
     94         holder.mTextView.setText(position + ":" + mValues.get(position));
     95         holder.mTextView.setMinHeight((200 + mValues.get(position).length() * 10));
     96         holder.mTextView.setBackgroundColor(getBackgroundColor(position));
     97     }
     98 
     99     private int getBackgroundColor(int position) {
    100         switch (position % 4) {
    101             case 0: return Color.BLACK;
    102             case 1: return Color.RED;
    103             case 2: return Color.DKGRAY;
    104             case 3: return Color.BLUE;
    105         }
    106         return Color.TRANSPARENT;
    107     }
    108 
    109     @Override
    110     public int getItemCount() {
    111         return mValues.size();
    112     }
    113 }
    114