Java tutorial
package com.bms.mqp.behaviormodelsystem; /* * 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. */ 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.ViewGroup; import android.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.Button; import android.widget.Spinner; import android.widget.SpinnerAdapter; import android.widget.Toast; import android.view.View.OnClickListener; 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 AppUsageStatisticsFragment extends Fragment { private static final String TAG = AppUsageStatisticsFragment.class.getSimpleName(); //VisibleForTesting for variables below UsageStatsManager mUsageStatsManager; UsageStatsListAdapter mUsageListAdapter; 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 AppUsageStatisticsFragment}. */ public static AppUsageStatisticsFragment newInstance() { AppUsageStatisticsFragment fragment = new AppUsageStatisticsFragment(); return fragment; } public AppUsageStatisticsFragment() { // 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 } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.fragment_app_usage_statistics, container, false); Button mRefreshButton = (Button) view.findViewById(R.id.button_refresh); mRefreshButton.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { String[] strings = getResources().getStringArray(R.array.action_list); StatsUsageInterval statsUsageInterval = StatsUsageInterval.getValue(strings[0]); List<UsageStats> usageStatsList = getUsageStatistics(statsUsageInterval.mInterval); Collections.sort(usageStatsList, new LastTimeLaunchedComparatorDesc()); updateAppsList(usageStatsList); } }); return view; } @Override public void onViewCreated(View rootView, Bundle savedInstanceState) { super.onViewCreated(rootView, savedInstanceState); mUsageListAdapter = new UsageStatsListAdapter(); mRecyclerView = (RecyclerView) rootView.findViewById(R.id.recyclerview_app_usage); mLayoutManager = mRecyclerView.getLayoutManager(); mRecyclerView.scrollToPosition(0); mRecyclerView.setAdapter(mUsageListAdapter); mOpenUsageSettingButton = (Button) rootView.findViewById(R.id.button_open_usage_setting); SpinnerAdapter spinnerAdapter = ArrayAdapter.createFromResource(getActivity(), R.array.action_list, android.R.layout.simple_spinner_dropdown_item); } /** * Returns the {@link #mRecyclerView} including the time span specified by the * intervalType argument. * * @param intervalType The time interval by which the stats are aggregated. * Corresponding to the value of {@link UsageStatsManager}. * E.g. {@link UsageStatsManager#INTERVAL_DAILY}, {@link * UsageStatsManager#INTERVAL_WEEKLY}, * * @return A list of {@link android.app.usage.UsageStats}. */ public List<UsageStats> getUsageStatistics(int intervalType) { // Get the app statistics since one year ago from the current time. Calendar cal = Calendar.getInstance(); cal.add(Calendar.YEAR, -1); List<UsageStats> queryUsageStats = mUsageStatsManager.queryUsageStats(intervalType, cal.getTimeInMillis(), System.currentTimeMillis()); if (queryUsageStats.size() == 0) { 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 View.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 usageStatsList A list of {@link UsageStats} from which update the * {@link #mRecyclerView}. */ //VisibleForTesting void updateAppsList(List<UsageStats> usageStatsList) { List<CustomUsageStats> customUsageStatsList = new ArrayList<>(); for (int i = 0; i < usageStatsList.size(); i++) { CustomUsageStats customUsageStats = new CustomUsageStats(); customUsageStats.usageStats = usageStatsList.get(i); try { Drawable appIcon = getActivity().getPackageManager() .getApplicationIcon(customUsageStats.usageStats.getPackageName()); customUsageStats.appIcon = appIcon; } catch (PackageManager.NameNotFoundException e) { Log.w(TAG, String.format("App Icon is not found for %s", customUsageStats.usageStats.getPackageName())); customUsageStats.appIcon = getActivity().getDrawable(R.drawable.ic_default_app_launcher); } customUsageStatsList.add(customUsageStats); } mUsageListAdapter.setCustomUsageStatsList(customUsageStatsList); mUsageListAdapter.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 LastTimeLaunchedComparatorDesc implements Comparator<UsageStats> { @Override public int compare(UsageStats left, UsageStats right) { return Long.compare(right.getLastTimeUsed(), left.getLastTimeUsed()); } } /** * Enum represents the intervals for {@link android.app.usage.UsageStatsManager} so that * values for intervals can be found by a String representation. * */ //VisibleForTesting static enum StatsUsageInterval { DAILY("Daily", UsageStatsManager.INTERVAL_DAILY), WEEKLY("Weekly", UsageStatsManager.INTERVAL_WEEKLY), MONTHLY("Monthly", UsageStatsManager.INTERVAL_MONTHLY), YEARLY("Yearly", UsageStatsManager.INTERVAL_YEARLY); private int mInterval; private String mStringRepresentation; StatsUsageInterval(String stringRepresentation, int interval) { mStringRepresentation = stringRepresentation; mInterval = interval; } static StatsUsageInterval getValue(String stringRepresentation) { for (StatsUsageInterval statsUsageInterval : values()) { if (statsUsageInterval.mStringRepresentation.equals(stringRepresentation)) { return statsUsageInterval; } } return null; } } }