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.android.email;
18 
19 import android.content.Context;
20 import android.content.res.Resources;
21 import android.content.res.TypedArray;
22 import android.graphics.Paint;
23 
24 /**
25  * Helper class to load resources.
26  */
27 public class ResourceHelper {
28     public final static int UNDEFINED_RESOURCE_ID = -1;
29 
30     private static ResourceHelper sInstance;
31     private final Context mContext;
32     private final Resources mResources;
33 
34     private final int[] mAccountColors;
35     private final Paint[] mAccountColorPaints;
36     private final TypedArray mAccountColorArray;
37 
ResourceHelper(Context context)38     private ResourceHelper(Context context) {
39         mContext = context.getApplicationContext();
40         mResources = mContext.getResources();
41 
42         mAccountColorArray = mResources.obtainTypedArray(R.array.combined_view_account_colors);
43         mAccountColors = mResources.getIntArray(R.array.combined_view_account_colors);
44         mAccountColorPaints = new Paint[mAccountColors.length];
45         for (int i = 0; i < mAccountColors.length; i++) {
46             Paint p = new Paint();
47             p.setColor(mAccountColors[i]);
48             mAccountColorPaints[i] = p;
49         }
50     }
51 
getInstance(Context context)52     public static synchronized ResourceHelper getInstance(Context context) {
53         if (sInstance == null) {
54             sInstance = new ResourceHelper(context);
55         }
56         return sInstance;
57     }
58 
getAccountColorIndex(long accountId)59     /* package */ int getAccountColorIndex(long accountId) {
60         // The account ID is 1-based, so -1.
61         // Use abs so that it'd work for -1 as well.
62         return Math.abs((int) ((accountId - 1) % mAccountColors.length));
63     }
64 
65     /**
66      * @return color for an account.
67      */
getAccountColor(long accountId)68     public int getAccountColor(long accountId) {
69         return mAccountColors[getAccountColorIndex(accountId)];
70     }
71 
72     /**
73      * @return The resource ID for an account color.
74      * Otherwise, {@value #UNDEFINED_RESOURCE_ID} if color was not specified via ID.
75      */
getAccountColorId(long accountId)76     public int getAccountColorId(long accountId) {
77         return mAccountColorArray.getResourceId(getAccountColorIndex(accountId),
78                 UNDEFINED_RESOURCE_ID);
79     }
80 
81     /**
82      * @return {@link Paint} equivalent to {@link #getAccountColor}.
83      */
getAccountColorPaint(long accountId)84     public Paint getAccountColorPaint(long accountId) {
85         return mAccountColorPaints[getAccountColorIndex(accountId)];
86     }
87 }
88