UiUtilities.java revision 2fbb3db5d86210d03175ce77ff08c989a96c5864 
1/*
2 * Copyright (C) 2011 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.android.email.activity;
18
19import com.android.email.R;
20
21import android.app.Activity;
22import android.content.Context;
23import android.content.res.Resources;
24import android.view.View;
25
26public class UiUtilities {
27    private UiUtilities() {
28    }
29
30    /**
31     * Formats the given size as a String in bytes, kB, MB or GB.  Ex: 12,315,000 = 11 MB
32     */
33    public static String formatSize(Context context, long size) {
34        final Resources res = context.getResources();
35        final long KB = 1024;
36        final long MB = (KB * 1024);
37        final long GB  = (MB * 1024);
38
39        int resId;
40        int value;
41
42        if (size < KB) {
43            resId = R.plurals.message_view_attachment_bytes;
44            value = (int) size;
45        } else if (size < MB) {
46            resId = R.plurals.message_view_attachment_kilobytes;
47            value = (int) (size / KB);
48        } else if (size < GB) {
49            resId = R.plurals.message_view_attachment_megabytes;
50            value = (int) (size / MB);
51        } else {
52            resId = R.plurals.message_view_attachment_gigabytes;
53            value = (int) (size / GB);
54        }
55        return res.getQuantityString(resId, value, value);
56    }
57
58    public static String getMessageCountForUi(Context context, int count,
59            boolean replaceZeroWithBlank) {
60        if (replaceZeroWithBlank && (count == 0)) {
61            return "";
62        } else if (count > 999) {
63            return context.getString(R.string.more_than_999);
64        } else {
65            return Integer.toString(count);
66        }
67    }
68
69    /**
70     * Same as {@link Activity#findViewById}, but crashes if there's no view.
71     */
72    public static View getView(Activity parent, int viewId) {
73        return checkView(parent.findViewById(viewId));
74    }
75
76    /**
77     * Same as {@link View#findViewById}, but crashes if there's no view.
78     */
79    public static View getView(View parent, int viewId) {
80        return checkView(parent.findViewById(viewId));
81    }
82
83    private static View checkView(View v) {
84        if (v == null) {
85            throw new IllegalArgumentException("View doesn't exist");
86        }
87        return v;
88    }
89
90    /**
91     * Same as {@link View#setVisibility(int)}, but doesn't crash even if {@code view} is null.
92     */
93    public static void setVisibilitySafe(View v, int visibility) {
94        if (v != null) {
95            v.setVisibility(visibility);
96        }
97    }
98
99    /**
100     * Same as {@link View#setVisibility(int)}, but doesn't crash even if {@code view} is null.
101     */
102    public static void setVisibilitySafe(Activity parent, int viewId, int visibility) {
103        setVisibilitySafe(parent.findViewById(viewId), visibility);
104    }
105
106    /**
107     * Same as {@link View#setVisibility(int)}, but doesn't crash even if {@code view} is null.
108     */
109    public static void setVisibilitySafe(View parent, int viewId, int visibility) {
110        setVisibilitySafe(parent.findViewById(viewId), visibility);
111    }
112}
113