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 17 package com.example.android.xmladapters; 18 19 import android.content.ContentUris; 20 import android.content.Context; 21 import android.content.res.Resources; 22 import android.database.Cursor; 23 import android.graphics.Bitmap; 24 import android.graphics.BitmapFactory; 25 import android.graphics.drawable.BitmapDrawable; 26 import android.graphics.drawable.Drawable; 27 import android.net.Uri; 28 import android.provider.ContactsContract; 29 import android.view.View; 30 import android.widget.TextView; 31 32 import java.io.InputStream; 33 import 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 */ 42 public 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
