1/*
2 * Copyright (C) 2013 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.google.android.test.shared_library;
18
19import android.app.Activity;
20import android.app.Fragment;
21import android.app.FragmentManager;
22import android.content.Context;
23import android.content.pm.PackageInfo;
24import android.content.pm.PackageManager;
25
26public class SharedLibraryMain {
27    static String LIBRARY_PACKAGE = "com.google.android.test.shared_library";
28
29    /**
30     * Base version of the library.
31     */
32    public static int VERSION_BASE = 1;
33
34    /**
35     * The second version of the library.
36     */
37    public static int VERSION_SECOND = 2;
38
39    /**
40     * Return the version number of the currently installed library.
41     */
42    public static int getVersion(Context context) {
43        PackageInfo pi = null;
44        try {
45            pi = context.getPackageManager().getPackageInfo(LIBRARY_PACKAGE, 0);
46            return pi.versionCode;
47        } catch (PackageManager.NameNotFoundException e) {
48            throw new IllegalStateException("Can't find my package!", e);
49        }
50    }
51
52    /**
53     * Check that the library's version is at least the given minimum version,
54     * displaying a dialog to have the user install an update if that is not true.
55     * The dialog is displayed as a DialogFragment in your activity if a newer
56     * version is needed.  If a newer version is needed, false is returned.
57     */
58    public static boolean ensureVersion(final Activity activity, int minVersion) {
59        final FragmentManager fm = activity.getFragmentManager();
60        final String dialogTag = LIBRARY_PACKAGE + ":version";
61        Fragment curDialog = fm.findFragmentByTag(dialogTag);
62
63        if (getVersion(activity) >= minVersion) {
64            // Library version is sufficient.  Make sure any version dialog
65            // we had shown is removed before returning.
66            if (curDialog != null) {
67                fm.beginTransaction().remove(curDialog).commitAllowingStateLoss();
68            }
69            return true;
70        }
71
72        // The current version of the library does not meet the required version.
73        // If we don't already have a version dialog displayed, display it now.
74        if (curDialog == null) {
75            curDialog = new VersionDialog();
76            fm.beginTransaction().add(curDialog, dialogTag).commitAllowingStateLoss();
77        }
78
79        // Tell the caller that the current version is not sufficient.
80        return false;
81    }
82}
83