1/*
2 * Copyright (C) 2017 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 android.support.v4.app;
18
19import android.content.Context;
20import android.content.Intent;
21import android.content.IntentSender;
22import android.support.annotation.Nullable;
23import android.support.annotation.RequiresApi;
24import android.util.AttributeSet;
25import android.view.View;
26
27@RequiresApi(14)
28abstract class BaseFragmentActivityApi14 extends SupportActivity {
29
30    // We need to keep track of whether startIntentSenderForResult originated from a Fragment, so we
31    // can conditionally check whether the requestCode collides with our reserved ID space for the
32    // request index (see above). Unfortunately we can't just call
33    // super.startIntentSenderForResult(...) to bypass the check when the call didn't come from a
34    // fragment, since we need to use the ActivityCompat version for backward compatibility.
35    boolean mStartedIntentSenderFromFragment;
36
37    @Override
38    public View onCreateView(View parent, String name, Context context, AttributeSet attrs) {
39        final View v = dispatchFragmentsOnCreateView(parent, name, context, attrs);
40        if (v == null) {
41            return super.onCreateView(parent, name, context, attrs);
42        }
43        return v;
44    }
45
46    @Override
47    public View onCreateView(String name, Context context, AttributeSet attrs) {
48        final View v = dispatchFragmentsOnCreateView(null, name, context, attrs);
49        if (v == null) {
50            return super.onCreateView(name, context, attrs);
51        }
52        return v;
53    }
54
55    abstract View dispatchFragmentsOnCreateView(View parent, String name,
56            Context context, AttributeSet attrs);
57
58    @Override
59    public void startIntentSenderForResult(IntentSender intent, int requestCode,
60            @Nullable Intent fillInIntent, int flagsMask, int flagsValues, int extraFlags)
61            throws IntentSender.SendIntentException {
62        // If this was started from a Fragment we've already checked the upper 16 bits were not in
63        // use, and then repurposed them for the Fragment's index.
64        if (!mStartedIntentSenderFromFragment) {
65            if (requestCode != -1) {
66                checkForValidRequestCode(requestCode);
67            }
68        }
69        super.startIntentSenderForResult(intent, requestCode, fillInIntent, flagsMask, flagsValues,
70                extraFlags);
71    }
72
73    /**
74     * Checks whether the given request code is a valid code by masking it with 0xffff0000. Throws
75     * an {@link IllegalArgumentException} if the code is not valid.
76     */
77    static void checkForValidRequestCode(int requestCode) {
78        if ((requestCode & 0xffff0000) != 0) {
79            throw new IllegalArgumentException("Can only use lower 16 bits for requestCode");
80        }
81    }
82}
83