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.expandingcells; 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.AbsListView; 33 import android.widget.ArrayAdapter; 34 import android.widget.ImageView; 35 import android.widget.LinearLayout; 36 import android.widget.ListView; 37 import android.widget.TextView; 38 39 import java.util.List; 40 41 /** 42 * This is a custom array adapter used to populate the listview whose items will 43 * expand to display extra content in addition to the default display. 44 */ 45 public class CustomArrayAdapter extends ArrayAdapter<ExpandableListItem> { 46 47 private List<ExpandableListItem> mData; 48 private int mLayoutViewResourceId; 49 CustomArrayAdapter(Context context, int layoutViewResourceId, List<ExpandableListItem> data)50 public CustomArrayAdapter(Context context, int layoutViewResourceId, 51 List<ExpandableListItem> data) { 52 super(context, layoutViewResourceId, data); 53 mData = data; 54 mLayoutViewResourceId = layoutViewResourceId; 55 } 56 57 /** 58 * Populates the item in the listview cell with the appropriate data. This method 59 * sets the thumbnail image, the title and the extra text. This method also updates 60 * the layout parameters of the item's view so that the image and title are centered 61 * in the bounds of the collapsed view, and such that the extra text is not displayed 62 * in the collapsed state of the cell. 63 */ 64 @Override getView(int position, View convertView, ViewGroup parent)65 public View getView(int position, View convertView, ViewGroup parent) { 66 67 final ExpandableListItem object = mData.get(position); 68 69 if(convertView == null) { 70 LayoutInflater inflater = ((Activity) getContext()).getLayoutInflater(); 71 convertView = inflater.inflate(mLayoutViewResourceId, parent, false); 72 } 73 74 LinearLayout linearLayout = (LinearLayout)(convertView.findViewById( 75 R.id.item_linear_layout)); 76 LinearLayout.LayoutParams linearLayoutParams = new LinearLayout.LayoutParams 77 (AbsListView.LayoutParams.MATCH_PARENT, object.getCollapsedHeight()); 78 linearLayout.setLayoutParams(linearLayoutParams); 79 80 ImageView imgView = (ImageView)convertView.findViewById(R.id.image_view); 81 TextView titleView = (TextView)convertView.findViewById(R.id.title_view); 82 TextView textView = (TextView)convertView.findViewById(R.id.text_view); 83 84 titleView.setText(object.getTitle()); 85 imgView.setImageBitmap(getCroppedBitmap(BitmapFactory.decodeResource(getContext() 86 .getResources(), object.getImgResource(), null))); 87 textView.setText(object.getText()); 88 89 convertView.setLayoutParams(new ListView.LayoutParams(AbsListView.LayoutParams.MATCH_PARENT, 90 AbsListView.LayoutParams.WRAP_CONTENT)); 91 92 ExpandingLayout expandingLayout = (ExpandingLayout)convertView.findViewById(R.id 93 .expanding_layout); 94 expandingLayout.setExpandedHeight(object.getExpandedHeight()); 95 expandingLayout.setSizeChangedListener(object); 96 97 if (!object.isExpanded()) { 98 expandingLayout.setVisibility(View.GONE); 99 } else { 100 expandingLayout.setVisibility(View.VISIBLE); 101 } 102 103 return convertView; 104 } 105 106 /** 107 * Crops a circle out of the thumbnail photo. 108 */ getCroppedBitmap(Bitmap bitmap)109 public Bitmap getCroppedBitmap(Bitmap bitmap) { 110 Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), 111 Config.ARGB_8888); 112 113 final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight()); 114 115 Canvas canvas = new Canvas(output); 116 117 final Paint paint = new Paint(); 118 paint.setAntiAlias(true); 119 120 int halfWidth = bitmap.getWidth()/2; 121 int halfHeight = bitmap.getHeight()/2; 122 123 canvas.drawCircle(halfWidth, halfHeight, Math.max(halfWidth, halfHeight), paint); 124 125 paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN)); 126 127 canvas.drawBitmap(bitmap, rect, rect, paint); 128 129 return output; 130 } 131 132 133 }