src/com/android/settings/fuelgauge/InactiveApps.java

/*
 * Copyright (C) 2015 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.android.settings.fuelgauge;

import android.app.usage.UsageStatsManager;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.os.Bundle;
import android.support.v7.preference.Preference;
import android.support.v7.preference.Preference.OnPreferenceClickListener;
import android.support.v7.preference.PreferenceGroup;

import com.android.internal.logging.nano.MetricsProto.MetricsEvent;
import com.android.settings.R;
import com.android.settings.SettingsPreferenceFragment;

import java.util.List;

public class InactiveApps extends SettingsPreferenceFragment implements OnPreferenceClickListener {

    private UsageStatsManager mUsageStats;

    @Override
    public int getMetricsCategory() {
        return MetricsEvent.FUELGAUGE_INACTIVE_APPS;
    }

    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);

        mUsageStats = getActivity().getSystemService(UsageStatsManager.class);
        addPreferencesFromResource(R.xml.inactive_apps);
    }

    @Override
    public void onResume() {
        super.onResume();
        init();
    }

    private void init() {
        PreferenceGroup screen = getPreferenceScreen();
        screen.removeAll();
        screen.setOrderingAsAdded(false);
        final Context context = getActivity();
        final PackageManager pm = context.getPackageManager();
        final UsageStatsManager usm = context.getSystemService(UsageStatsManager.class);

        Intent launcherIntent = new Intent(Intent.ACTION_MAIN);
        launcherIntent.addCategory(Intent.CATEGORY_LAUNCHER);
        List<ResolveInfo> apps = pm.queryIntentActivities(launcherIntent, 0);
        for (ResolveInfo app : apps) {
            String packageName = app.activityInfo.applicationInfo.packageName;
            Preference p = new Preference(getPrefContext());
            p.setTitle(app.loadLabel(pm));
            p.setIcon(app.loadIcon(pm));
            p.setKey(packageName);
            updateSummary(p);
            p.setOnPreferenceClickListener(this);

            screen.addPreference(p);
        }
    }

    private void updateSummary(Preference p) {
        boolean inactive = mUsageStats.isAppInactive(p.getKey());
        p.setSummary(inactive
                ? R.string.inactive_app_inactive_summary
                : R.string.inactive_app_active_summary);
    }

    @Override
    public boolean onPreferenceClick(Preference preference) {
        String packageName = preference.getKey();
        mUsageStats.setAppInactive(packageName, !mUsageStats.isAppInactive(packageName));
        updateSummary(preference);
        return false;
    }
}