97 lines
3.7 KiB
Java
97 lines
3.7 KiB
Java
/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.example.android.xmladapters;
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import android.content.ContentUris;
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import android.content.Context;
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import android.content.res.Resources;
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import android.database.Cursor;
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import android.graphics.Bitmap;
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import android.graphics.BitmapFactory;
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import android.graphics.drawable.BitmapDrawable;
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import android.graphics.drawable.Drawable;
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import android.net.Uri;
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import android.provider.ContactsContract;
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import android.view.View;
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import android.widget.TextView;
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import java.io.InputStream;
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import java.util.HashMap;
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/**
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* This custom cursor binder is used by the adapter defined in res/xml to
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* bind contacts photos to their respective list item. This binder simply
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* queries a contact's photo based on the contact's id and sets the
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* photo as a compound drawable on the TextView used to display the contact's
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* name.
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*/
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public class ContactPhotoBinder extends Adapters.CursorBinder {
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private static final int PHOTO_SIZE_DIP = 54;
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private final Drawable mDefault;
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private final HashMap<Long, Drawable> mCache;
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private final Resources mResources;
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private final int mPhotoSize;
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public ContactPhotoBinder(Context context, Adapters.CursorTransformation transformation) {
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super(context, transformation);
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mResources = mContext.getResources();
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// Default picture used when a contact does not provide one
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mDefault = mResources.getDrawable(R.drawable.ic_contact_picture);
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// Cache used to avoid re-querying contacts photos every time
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mCache = new HashMap<Long, Drawable>();
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// Compute the size of the photo based on the display's density
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mPhotoSize = (int) (PHOTO_SIZE_DIP * mResources.getDisplayMetrics().density + 0.5f);
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}
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@Override
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public boolean bind(View view, Cursor cursor, int columnIndex) {
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final long id = cursor.getLong(columnIndex);
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// First check whether we have already cached the contact's photo
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Drawable d = mCache.get(id);
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if (d == null) {
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// If the photo wasn't in the cache, ask the contacts provider for
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// an input stream we can use to load the photo
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Uri uri = ContentUris.withAppendedId(ContactsContract.Contacts.CONTENT_URI, id);
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InputStream stream = ContactsContract.Contacts.openContactPhotoInputStream(
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mContext.getContentResolver(), uri);
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// Creates the drawable for the contact's photo or use our fallback drawable
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if (stream != null) {
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// decoding the bitmap could be done in a worker thread too.
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Bitmap bitmap = BitmapFactory.decodeStream(stream);
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d = new BitmapDrawable(mResources, bitmap);
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} else {
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d = mDefault;
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}
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d.setBounds(0, 0, mPhotoSize, mPhotoSize);
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((TextView) view).setCompoundDrawables(d, null, null, null);
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// Remember the photo associated with this contact
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mCache.put(id, d);
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} else {
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((TextView) view).setCompoundDrawables(d, null, null, null);
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}
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return true;
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}
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}
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