Daniel Olshansky | 5bcd87e | 2013-07-15 09:29:51 -0700 | [diff] [blame^] | 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 | } |