Java tutorial
/* * Copyright 2014 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.bms.mqp.behaviormodelsystem; import android.app.usage.UsageEvents; import android.app.usage.UsageStats; import android.app.usage.UsageStatsManager; import android.content.Context; import android.content.Intent; import android.content.pm.PackageManager; import android.graphics.drawable.Drawable; import android.os.Bundle; import android.provider.Settings; import android.support.v4.app.Fragment; import android.support.v7.widget.RecyclerView; import android.util.Log; import android.view.LayoutInflater; import android.view.View; import android.view.View.OnClickListener; import android.view.ViewGroup; import android.widget.Button; import android.widget.Toast; import java.util.ArrayList; import java.util.Calendar; import java.util.Collections; import java.util.Comparator; import java.util.List; /** * Fragment that demonstrates how to use App Usage Statistics API. */ public class AppUsageEventsFragment extends Fragment { private static final String TAG = AppUsageEventsFragment.class.getSimpleName(); private static final long USAGE_STATS_PERIOD = 1000 * 60 * 60 * 1; private long mLastTime; //VisibleForTesting for variables below UsageStatsManager mUsageStatsManager; UsageEventsListAdapter mUsageEventsListAdapter; RecyclerView mRecyclerView; RecyclerView.LayoutManager mLayoutManager; Button mOpenUsageSettingButton; /** * Use this factory method to create a new instance of * this fragment using the provided parameters. * * @return A new instance of fragment {@link AppUsageEventsFragment}. */ public static AppUsageEventsFragment newInstance() { AppUsageEventsFragment fragment = new AppUsageEventsFragment(); return fragment; } public AppUsageEventsFragment() { // Required empty public constructor } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); mUsageStatsManager = (UsageStatsManager) getActivity().getSystemService(Context.USAGE_STATS_SERVICE); //Context.USAGE_STATS_SERVICE mLastTime = System.currentTimeMillis() - USAGE_STATS_PERIOD; } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.fragment_app_usage_events, container, false); Button mRefreshButton = (Button) view.findViewById(R.id.button_refresh); mRefreshButton.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { UsageEvents usageEventsList = getUsageStatistics(); updateAppsList(usageEventsList); } }); return view; } @Override public void onViewCreated(View rootView, Bundle savedInstanceState) { super.onViewCreated(rootView, savedInstanceState); mUsageEventsListAdapter = new UsageEventsListAdapter(); mRecyclerView = (RecyclerView) rootView.findViewById(R.id.recyclerview_app_usage); mLayoutManager = mRecyclerView.getLayoutManager(); mRecyclerView.scrollToPosition(0); mRecyclerView.setAdapter(mUsageEventsListAdapter); mOpenUsageSettingButton = (Button) rootView.findViewById(R.id.button_open_usage_setting); } /** * Returns the {@link #mRecyclerView} including the time span specified by the * intervalType argument. * * * @return A list of {@link UsageStats}. */ public UsageEvents getUsageStatistics() { // Get the app statistics since one year ago from the current time. Calendar cal = Calendar.getInstance(); cal.add(Calendar.YEAR, -1); long now = System.currentTimeMillis(); UsageEvents queryUsageStats = mUsageStatsManager.queryEvents(mLastTime, now); if (!queryUsageStats.hasNextEvent()) { Log.i(TAG, "The user may not allow the access to apps usage. "); Toast.makeText(getActivity(), getString(R.string.explanation_access_to_appusage_is_not_enabled), Toast.LENGTH_LONG).show(); mOpenUsageSettingButton.setVisibility(View.VISIBLE); mOpenUsageSettingButton.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { startActivity(new Intent(Settings.ACTION_USAGE_ACCESS_SETTINGS)); } }); } return queryUsageStats; } /** * Updates the {@link #mRecyclerView} with the list of {@link UsageStats} passed as an argument. * * @param usageEventsList A list of {@link UsageStats} from which update the * {@link #mRecyclerView}. */ //VisibleForTesting void updateAppsList(UsageEvents usageEventsList) { List<CustomUsageEvents> customUsageEventsList = new ArrayList<>(); while (usageEventsList.hasNextEvent()) { CustomUsageEvents customUsageEvents = new CustomUsageEvents(); UsageEvents.Event event; event = new UsageEvents.Event(); usageEventsList.getNextEvent(event); customUsageEvents.usageEvent = event; try { Drawable appIcon = getActivity().getPackageManager() .getApplicationIcon(customUsageEvents.usageEvent.getPackageName()); customUsageEvents.appIcon = appIcon; } catch (PackageManager.NameNotFoundException e) { Log.w(TAG, String.format("App Icon is not found for %s", customUsageEvents.usageEvent.getPackageName())); customUsageEvents.appIcon = getActivity().getDrawable(R.drawable.ic_default_app_launcher); } customUsageEventsList.add(customUsageEvents); } Collections.sort(customUsageEventsList, new TimeStampComparator()); mUsageEventsListAdapter.setCustomUsageStatsList(customUsageEventsList); mUsageEventsListAdapter.notifyDataSetChanged(); mRecyclerView.scrollToPosition(0); } /** * The {@link Comparator} to sort a collection of {@link UsageStats} sorted by the timestamp * last time the app was used in the descendant order. */ private static class TimeStampComparator implements Comparator<CustomUsageEvents> { @Override public int compare(CustomUsageEvents left, CustomUsageEvents right) { return Long.compare(right.usageEvent.getTimeStamp(), left.usageEvent.getTimeStamp()); } } }