1/*
2 * Copyright (C) 2010 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
17package com.example.android.xmladapters;
18
19import android.content.ContentUris;
20import android.content.Context;
21import android.content.res.Resources;
22import android.database.Cursor;
23import android.graphics.Bitmap;
24import android.graphics.BitmapFactory;
25import android.graphics.drawable.BitmapDrawable;
26import android.graphics.drawable.Drawable;
27import android.net.Uri;
28import android.provider.ContactsContract;
29import android.view.View;
30import android.widget.TextView;
31
32import java.io.InputStream;
33import java.util.HashMap;
34
35/**
36 * This custom cursor binder is used by the adapter defined in res/xml to
37 * bind contacts photos to their respective list item. This binder simply
38 * queries a contact's photo based on the contact's id and sets the
39 * photo as a compound drawable on the TextView used to display the contact's
40 * name.
41 */
42public class ContactPhotoBinder extends Adapters.CursorBinder {
43    private static final int PHOTO_SIZE_DIP = 54;
44
45    private final Drawable mDefault;
46    private final HashMap<Long, Drawable> mCache;
47    private final Resources mResources;
48    private final int mPhotoSize;
49
50    public ContactPhotoBinder(Context context, Adapters.CursorTransformation transformation) {
51        super(context, transformation);
52
53        mResources = mContext.getResources();
54        // Default picture used when a contact does not provide one
55        mDefault = mResources.getDrawable(R.drawable.ic_contact_picture);
56        // Cache used to avoid re-querying contacts photos every time
57        mCache = new HashMap<Long, Drawable>();
58        // Compute the size of the photo based on the display's density
59        mPhotoSize = (int) (PHOTO_SIZE_DIP * mResources.getDisplayMetrics().density + 0.5f);
60    }
61
62    @Override
63    public boolean bind(View view, Cursor cursor, int columnIndex) {
64        final long id = cursor.getLong(columnIndex);
65
66        // First check whether we have already cached the contact's photo
67        Drawable d = mCache.get(id);
68
69        if (d == null) {
70            // If the photo wasn't in the cache, ask the contacts provider for
71            // an input stream we can use to load the photo
72            Uri uri = ContentUris.withAppendedId(ContactsContract.Contacts.CONTENT_URI, id);
73            InputStream stream = ContactsContract.Contacts.openContactPhotoInputStream(
74                    mContext.getContentResolver(), uri);
75
76            // Creates the drawable for the contact's photo or use our fallback drawable
77            if (stream != null) {
78                // decoding the bitmap could be done in a worker thread too.
79                Bitmap bitmap = BitmapFactory.decodeStream(stream);
80                d = new BitmapDrawable(mResources, bitmap);
81            } else {
82                d = mDefault;
83            }
84
85            d.setBounds(0, 0, mPhotoSize, mPhotoSize);
86            ((TextView) view).setCompoundDrawables(d, null, null, null);
87
88            // Remember the photo associated with this contact
89            mCache.put(id, d);
90        } else {
91            ((TextView) view).setCompoundDrawables(d, null, null, null);
92        }
93
94        return true;
95    }
96}
97