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/*
* Copyright (C) 2013 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.example.android.insertingcells;
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.PorterDuff.Mode;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import java.util.HashMap;
import java.util.List;
/**
* This custom array adapter is used to populate the ListView in this application.
* This adapter also maintains a map of unique stable ids for each object in the data set.
* Since this adapter has to support the addition of a new cell to the 1ist index, it also
* provides a mechanism to add a stable ID for new data that was recently inserted.
*/
public class CustomArrayAdapter extends ArrayAdapter<ListItemObject> {
HashMap<ListItemObject, Integer> mIdMap = new HashMap<ListItemObject, Integer>();
List<ListItemObject> mData;
Context mContext;
int mLayoutViewResourceId;
int mCounter;
public CustomArrayAdapter(Context context, int layoutViewResourceId,
List <ListItemObject> data) {
super(context, layoutViewResourceId, data);
mData = data;
mContext = context;
mLayoutViewResourceId = layoutViewResourceId;
updateStableIds();
}
public long getItemId(int position) {
ListItemObject item = getItem(position);
if (mIdMap.containsKey(item)) {
return mIdMap.get(item);
}
return -1;
}
public void updateStableIds() {
mIdMap.clear();
mCounter = 0;
for (int i = 0; i < mData.size(); ++i) {
mIdMap.put(mData.get(i), mCounter++);
}
}
public void addStableIdForDataAtPosition(int position) {
mIdMap.put(mData.get(position), ++mCounter);
}
@Override
public boolean hasStableIds() {
return true;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ListItemObject obj = mData.get(position);
if(convertView == null) {
LayoutInflater inflater = ((Activity)mContext).getLayoutInflater();
convertView = inflater.inflate(mLayoutViewResourceId, parent, false);
}
convertView.setLayoutParams(new ListView.LayoutParams(ListView.LayoutParams
.MATCH_PARENT, obj.getHeight()));
ImageView imgView = (ImageView)convertView.findViewById(R.id.image_view);
TextView textView = (TextView)convertView.findViewById(R.id.text_view);
Bitmap bitmap = BitmapFactory.decodeResource(mContext.getResources(),
obj.getImgResource(), null);
textView.setText(obj.getTitle());
imgView.setImageBitmap(CustomArrayAdapter.getCroppedBitmap(bitmap));
return convertView;
}
/**
* Returns a circular cropped version of the bitmap passed in.
*/
public static Bitmap getCroppedBitmap(Bitmap bitmap) {
Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(),
Config.ARGB_8888);
final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
Canvas canvas = new Canvas(output);
final Paint paint = new Paint();
paint.setAntiAlias(true);
int halfWidth = bitmap.getWidth() / 2;
int halfHeight = bitmap.getHeight() / 2;
canvas.drawCircle(halfWidth, halfHeight, Math.max(halfWidth, halfHeight), paint);
paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
canvas.drawBitmap(bitmap, rect, rect, paint);
return output;
}
}
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