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      1 /*
      2  * Copyright (C) 2018 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 
     17 package com.google.android.setupcompat.internal;
     18 
     19 import static java.util.concurrent.TimeUnit.NANOSECONDS;
     20 
     21 import android.app.Activity;
     22 import android.app.Fragment;
     23 import android.app.FragmentManager;
     24 import android.content.Context;
     25 import android.os.Build.VERSION;
     26 import android.os.Build.VERSION_CODES;
     27 import android.util.Log;
     28 import com.google.android.setupcompat.logging.MetricKey;
     29 import com.google.android.setupcompat.logging.SetupMetricsLogger;
     30 import com.google.android.setupcompat.util.WizardManagerHelper;
     31 
     32 /** Fragment used to detect lifecycle of an activity for metrics logging. */
     33 public class LifecycleFragment extends Fragment {
     34   private static final String LOG_TAG = LifecycleFragment.class.getSimpleName();
     35   private static final String FRAGMENT_ID = "lifecycle_monitor";
     36 
     37   private MetricKey metricKey;
     38   private long startInNanos;
     39   private long durationInNanos = 0;
     40 
     41   public LifecycleFragment() {
     42     setRetainInstance(true);
     43   }
     44 
     45   /**
     46    * Attaches the lifecycle fragment if it is not attached yet.
     47    *
     48    * @param activity the activity to detect lifecycle for.
     49    * @return fragment to monitor life cycle.
     50    */
     51   public static LifecycleFragment attachNow(Activity activity) {
     52     if (WizardManagerHelper.isAnySetupWizard(activity.getIntent())) {
     53       SetupCompatServiceInvoker.get(activity.getApplicationContext())
     54           .bindBack(
     55               LayoutBindBackHelper.getScreenName(activity),
     56               LayoutBindBackHelper.getExtraBundle(activity));
     57 
     58       if (VERSION.SDK_INT > VERSION_CODES.M) {
     59         FragmentManager fragmentManager = activity.getFragmentManager();
     60         if (fragmentManager != null && !fragmentManager.isDestroyed()) {
     61           Fragment fragment = fragmentManager.findFragmentByTag(FRAGMENT_ID);
     62           if (fragment == null) {
     63             LifecycleFragment lifeCycleFragment = new LifecycleFragment();
     64             try {
     65               fragmentManager.beginTransaction().add(lifeCycleFragment, FRAGMENT_ID).commitNow();
     66               fragment = lifeCycleFragment;
     67             } catch (IllegalStateException e) {
     68               Log.e(
     69                   LOG_TAG,
     70                   "Error occurred when attach to Activity:" + activity.getComponentName(),
     71                   e);
     72             }
     73           } else if (!(fragment instanceof LifecycleFragment)) {
     74             Log.wtf(
     75                 LOG_TAG,
     76                 activity.getClass().getSimpleName() + " Incorrect instance on lifecycle fragment.");
     77             return null;
     78           }
     79           return (LifecycleFragment) fragment;
     80         }
     81       }
     82     }
     83 
     84     return null;
     85   }
     86 
     87   @Override
     88   public void onAttach(Context context) {
     89     super.onAttach(context);
     90     metricKey = MetricKey.get("ScreenDuration", getActivity().getClass().getSimpleName());
     91   }
     92 
     93   @Override
     94   public void onDetach() {
     95     super.onDetach();
     96     SetupMetricsLogger.logDuration(getActivity(), metricKey, NANOSECONDS.toMillis(durationInNanos));
     97   }
     98 
     99   @Override
    100   public void onResume() {
    101     super.onResume();
    102     startInNanos = ClockProvider.timeInNanos();
    103   }
    104 
    105   @Override
    106   public void onPause() {
    107     super.onPause();
    108     durationInNanos += (ClockProvider.timeInNanos() - startInNanos);
    109   }
    110 }
    111