BaseFragmentActivityGingerbread.java revision 5c64d9dd4e98d84815a66263f2ef89ed7091b1f3 
1/*
2 * Copyright (C) 2015 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.app.Activity;
20import android.content.Context;
21import android.content.Intent;
22import android.content.IntentSender;
23import android.os.Build;
24import android.os.Bundle;
25import android.support.annotation.Nullable;
26import android.util.AttributeSet;
27import android.view.View;
28
29/**
30 * Base class for {@code FragmentActivity} to be able to use Gingerbread APIs.
31 *
32 * @hide
33 */
34abstract class BaseFragmentActivityGingerbread extends Activity {
35
36    // We need to keep track of whether startIntentSenderForResult originated from a Fragment, so we
37    // can conditionally check whether the requestCode collides with our reserved ID space for the
38    // request index (see above). Unfortunately we can't just call
39    // super.startIntentSenderForResult(...) to bypass the check when the call didn't come from a
40    // fragment, since we need to use the ActivityCompat version for backward compatibility.
41    boolean mStartedIntentSenderFromFragment;
42
43    @Override
44    protected void onCreate(Bundle savedInstanceState) {
45        if (Build.VERSION.SDK_INT < 11 && getLayoutInflater().getFactory() == null) {
46            // On pre-HC devices we need to manually install ourselves as a Factory.
47            // On HC and above, we are automatically installed as a private factory
48            getLayoutInflater().setFactory(this);
49        }
50
51        super.onCreate(savedInstanceState);
52    }
53
54    @Override
55    public View onCreateView(String name, Context context, AttributeSet attrs) {
56        final View v = dispatchFragmentsOnCreateView(null, name, context, attrs);
57        if (v == null) {
58            return super.onCreateView(name, context, attrs);
59        }
60        return v;
61    }
62
63    abstract View dispatchFragmentsOnCreateView(View parent, String name,
64            Context context, AttributeSet attrs);
65
66
67    @Override
68    public void startIntentSenderForResult(IntentSender intent, int requestCode,
69            @Nullable Intent fillInIntent, int flagsMask, int flagsValues, int extraFlags)
70            throws IntentSender.SendIntentException {
71        // If this was started from a Fragment we've already checked the upper 16 bits were not in
72        // use, and then repurposed them for the Fragment's index.
73        if (!mStartedIntentSenderFromFragment) {
74            if (requestCode != -1) {
75                checkForValidRequestCode(requestCode);
76            }
77        }
78        super.startIntentSenderForResult(intent, requestCode, fillInIntent, flagsMask, flagsValues,
79                extraFlags);
80    }
81
82    /**
83     * Checks whether the given request code is a valid code by masking it with 0xffff0000. Throws
84     * an {@link IllegalArgumentException} if the code is not valid.
85     */
86    static void checkForValidRequestCode(int requestCode) {
87        if ((requestCode & 0xffff0000) != 0) {
88            throw new IllegalArgumentException("Can only use lower 16 bits for requestCode");
89        }
90    }
91}
92