SafeDismissDialogFragment.java revision 38fef3bf253578f518d1bc727da4afb263194398 
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 com.android.tv.dialog;
18
19import android.app.Activity;
20import android.app.DialogFragment;
21import com.android.tv.MainActivity;
22import com.android.tv.TvApplication;
23import com.android.tv.analytics.HasTrackerLabel;
24import com.android.tv.analytics.Tracker;
25
26/** Provides the safe dismiss feature regardless of the DialogFragment's life cycle. */
27public abstract class SafeDismissDialogFragment extends DialogFragment implements HasTrackerLabel {
28    private MainActivity mActivity;
29    private boolean mAttached = false;
30    private boolean mDismissPending = false;
31    private Tracker mTracker;
32
33    @Override
34    public void onAttach(Activity activity) {
35        super.onAttach(activity);
36        mAttached = true;
37        if (activity instanceof MainActivity) {
38            mActivity = (MainActivity) activity;
39        }
40        mTracker = TvApplication.getSingletons(activity).getTracker();
41        if (mDismissPending) {
42            mDismissPending = false;
43            dismiss();
44        }
45    }
46
47    @Override
48    public void onResume() {
49        super.onResume();
50        mTracker.sendScreenView(getTrackerLabel());
51    }
52
53    @Override
54    public void onDestroy() {
55        if (mActivity != null) {
56            mActivity.getOverlayManager().onDialogDestroyed();
57        }
58        super.onDestroy();
59    }
60
61    @Override
62    public void onDetach() {
63        super.onDetach();
64        mAttached = false;
65        mTracker = null;
66    }
67
68    /** Dismiss safely regardless of the DialogFragment's life cycle. */
69    @Override
70    public void dismiss() {
71        if (!mAttached) {
72            // dismiss() before getFragmentManager() is set cause NPE in dismissInternal().
73            // FragmentManager is set when a fragment is used in a transaction,
74            // so wait here until we can dismiss safely.
75            mDismissPending = true;
76        } else {
77            super.dismiss();
78        }
79    }
80}
81