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      1 /*
      2  * Copyright (C) 2013 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.insertingcells;
     18 
     19 import android.app.Activity;
     20 import android.content.Context;
     21 import android.graphics.Bitmap;
     22 import android.graphics.Bitmap.Config;
     23 import android.graphics.BitmapFactory;
     24 import android.graphics.Canvas;
     25 import android.graphics.Paint;
     26 import android.graphics.PorterDuff.Mode;
     27 import android.graphics.PorterDuffXfermode;
     28 import android.graphics.Rect;
     29 import android.view.LayoutInflater;
     30 import android.view.View;
     31 import android.view.ViewGroup;
     32 import android.widget.ArrayAdapter;
     33 import android.widget.ImageView;
     34 import android.widget.ListView;
     35 import android.widget.TextView;
     36 
     37 import java.util.HashMap;
     38 import java.util.List;
     39 
     40 /**
     41  * This custom array adapter is used to populate the ListView in this application.
     42  * This adapter also maintains a map of unique stable ids for each object in the data set.
     43  * Since this adapter has to support the addition of a new cell to the 1ist index, it also
     44  * provides a mechanism to add a stable ID for new data that was recently inserted.
     45  */
     46 public class CustomArrayAdapter extends ArrayAdapter<ListItemObject> {
     47 
     48     HashMap<ListItemObject, Integer> mIdMap = new HashMap<ListItemObject, Integer>();
     49     List<ListItemObject> mData;
     50     Context mContext;
     51     int mLayoutViewResourceId;
     52     int mCounter;
     53 
     54     public CustomArrayAdapter(Context context, int layoutViewResourceId,
     55                               List <ListItemObject> data) {
     56         super(context, layoutViewResourceId, data);
     57         mData = data;
     58         mContext = context;
     59         mLayoutViewResourceId = layoutViewResourceId;
     60         updateStableIds();
     61     }
     62 
     63     public long getItemId(int position) {
     64         ListItemObject item = getItem(position);
     65         if (mIdMap.containsKey(item)) {
     66             return mIdMap.get(item);
     67         }
     68         return -1;
     69     }
     70 
     71     public void updateStableIds() {
     72         mIdMap.clear();
     73         mCounter = 0;
     74         for (int i = 0; i < mData.size(); ++i) {
     75             mIdMap.put(mData.get(i), mCounter++);
     76         }
     77     }
     78 
     79     public void addStableIdForDataAtPosition(int position) {
     80         mIdMap.put(mData.get(position), ++mCounter);
     81     }
     82 
     83     @Override
     84     public boolean hasStableIds() {
     85         return true;
     86     }
     87 
     88     @Override
     89     public View getView(int position, View convertView, ViewGroup parent) {
     90 
     91         ListItemObject obj = mData.get(position);
     92 
     93         if(convertView == null) {
     94             LayoutInflater inflater = ((Activity)mContext).getLayoutInflater();
     95             convertView = inflater.inflate(mLayoutViewResourceId, parent, false);
     96         }
     97 
     98         convertView.setLayoutParams(new ListView.LayoutParams(ListView.LayoutParams
     99                 .MATCH_PARENT, obj.getHeight()));
    100 
    101         ImageView imgView = (ImageView)convertView.findViewById(R.id.image_view);
    102         TextView textView = (TextView)convertView.findViewById(R.id.text_view);
    103 
    104         Bitmap bitmap = BitmapFactory.decodeResource(mContext.getResources(),
    105                 obj.getImgResource(), null);
    106 
    107         textView.setText(obj.getTitle());
    108         imgView.setImageBitmap(CustomArrayAdapter.getCroppedBitmap(bitmap));
    109 
    110         return convertView;
    111     }
    112 
    113     /**
    114      * Returns a circular cropped version of the bitmap passed in.
    115      */
    116     public static Bitmap getCroppedBitmap(Bitmap bitmap) {
    117         Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(),
    118                 Config.ARGB_8888);
    119 
    120         final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
    121 
    122         Canvas canvas = new Canvas(output);
    123 
    124         final Paint paint = new Paint();
    125         paint.setAntiAlias(true);
    126 
    127         int halfWidth = bitmap.getWidth() / 2;
    128         int halfHeight = bitmap.getHeight() / 2;
    129 
    130         canvas.drawCircle(halfWidth, halfHeight, Math.max(halfWidth, halfHeight), paint);
    131 
    132         paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
    133 
    134         canvas.drawBitmap(bitmap, rect, rect, paint);
    135 
    136         return output;
    137     }
    138 }