[3FT] Retrieve all the installed apps

<PreferenceScreen

    xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:settings="http://schemas.android.com/apk/res-auto"

    android:key="input_touchpad_three_finger_tap"

    android:persistent="false"

    android:title="@string/three_finger_tap_launch_app_title"/>

    android:title="@string/three_finger_tap_launch_app_title"

    settings:controller="com.android.settings.inputmethod.TouchpadThreeFingerTapAppSelectionPreferenceController"/>

/*

 * Copyright 2025 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.inputmethod;

import android.app.ActivityManager;

import android.content.Context;

import android.content.pm.LauncherActivityInfo;

import android.content.pm.LauncherApps;

import android.hardware.input.InputSettings;

import android.os.UserHandle;

import android.util.DisplayMetrics;

import androidx.annotation.NonNull;

import androidx.annotation.Nullable;

import androidx.preference.PreferenceScreen;

import com.android.settings.core.BasePreferenceController;

import com.android.settingslib.widget.SelectorWithWidgetPreference;

import java.util.Comparator;

import java.util.List;

/**

 * Preference controller that updates a list of installed app Preferences.

 * This screen is a sub-page of {@link TouchpadThreeFingerTapPreferenceController}) allowing three

 * finger tap gesture to open the selected app.

 */

public class TouchpadThreeFingerTapAppSelectionPreferenceController

        extends BasePreferenceController {

    private final LauncherApps mLauncherApps;

    @Nullable private PreferenceScreen mPreferenceScreen;

    public TouchpadThreeFingerTapAppSelectionPreferenceController(@NonNull Context context,

            @NonNull String key) {

        super(context, key);

        mLauncherApps = mContext.getSystemService(LauncherApps.class);

    }

    @Override

    public int getAvailabilityStatus() {

        boolean isTouchpad = InputPeripheralsSettingsUtils.isTouchpad();

        return (InputSettings.isTouchpadThreeFingerTapShortcutFeatureFlagEnabled() && isTouchpad)

                ? AVAILABLE : CONDITIONALLY_UNAVAILABLE;

    }

    @Override

    public void displayPreference(@NonNull PreferenceScreen screen) {

        super.displayPreference(screen);

        mPreferenceScreen = screen;

        updateApps();

    }

    private void updateApps() {

        if (mPreferenceScreen == null) {

            return;

        }

        mPreferenceScreen.removeAll();

        int userId = ActivityManager.getCurrentUser();

        List<LauncherActivityInfo> appInfos =

                mLauncherApps.getActivityList(/* packageName = */ null, UserHandle.of(userId));

        appInfos.sort(Comparator.comparing(appInfo -> appInfo.getLabel().toString()));

        for (LauncherActivityInfo appInfo : appInfos) {

            mPreferenceScreen.addPreference(createPreference(appInfo));

        }

    }

    private SelectorWithWidgetPreference createPreference(LauncherActivityInfo appInfo) {

        SelectorWithWidgetPreference preference = new SelectorWithWidgetPreference(mContext);

        preference.setKey(appInfo.getComponentName().flattenToString());

        preference.setTitle(appInfo.getLabel());

        preference.setIcon(appInfo.getIcon(DisplayMetrics.DENSITY_DEVICE_STABLE));

        return preference;

    }

}