PermissionController/src/com/android/packageinstaller/permission/ui/ManagePermissionsFragment.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.packageinstaller.permission.ui;

import android.app.ActionBar;
import android.app.Activity;
import android.app.FragmentTransaction;
import android.content.ActivityNotFoundException;
import android.content.Intent;
import android.content.res.Resources;
import android.content.res.Resources.Theme;
import android.os.Bundle;
import android.preference.Preference;
import android.preference.Preference.OnPreferenceClickListener;
import android.preference.PreferenceFragment;
import android.preference.PreferenceScreen;
import android.util.Log;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;

import com.android.packageinstaller.R;
import com.android.packageinstaller.permission.model.PermissionGroup;
import com.android.packageinstaller.permission.model.PermissionGroups;
import com.android.packageinstaller.permission.utils.Utils;

import java.util.List;

public final class ManagePermissionsFragment extends PreferenceFragment
        implements PermissionGroups.PermissionsGroupsChangeCallback, OnPreferenceClickListener {
    private static final String LOG_TAG = "ManagePermissionsFragment";

    private static final String OS_PKG = "android";

    private PermissionGroups mPermissions;

    private PreferenceScreen mExtraScreen;

    private boolean mShowLegacyPermissions;

    public static ManagePermissionsFragment newInstance() {
        return new ManagePermissionsFragment();
    }

    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        setHasOptionsMenu(true);
        final ActionBar ab = getActivity().getActionBar();
        if (ab != null) {
            ab.setDisplayHomeAsUpEnabled(true);
        }
        mPermissions = new PermissionGroups(getActivity(), getLoaderManager(), this);
    }

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

    @Override
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
        super.onCreateOptionsMenu(menu, inflater);
        inflater.inflate(R.menu.toggle_legacy_permissions, menu);
    }

    @Override
    public void onPrepareOptionsMenu(Menu menu) {
        MenuItem item = menu.findItem(R.id.toggle_legacy_permissions);
        if (!mShowLegacyPermissions) {
            item.setTitle(R.string.show_legacy_permissions);
        } else {
            item.setTitle(R.string.hide_legacy_permissions);
        }
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case android.R.id.home: {
                getActivity().finish();
                return true;
            }

            case R.id.toggle_legacy_permissions: {
                mShowLegacyPermissions = !mShowLegacyPermissions;
                updatePermissionsUi();
                return true;
            }
        }
        return super.onOptionsItemSelected(item);
    }

    @Override
    public boolean onPreferenceClick(Preference preference) {
        String key = preference.getKey();

        PermissionGroup group = mPermissions.getGroup(key);
        if (group == null) {
            return false;
        }

        Intent intent = new Intent(Intent.ACTION_MANAGE_PERMISSION_APPS)
                .putExtra(Intent.EXTRA_PERMISSION_NAME, key);
        try {
            getActivity().startActivity(intent);
        } catch (ActivityNotFoundException e) {
            Log.w(LOG_TAG, "No app to handle " + intent);
        }

        return true;
    }

    @Override
    public void onPermissionGroupsChanged() {
        updatePermissionsUi();
    }

    private void updatePermissionsUi() {
        Activity activity = getActivity();

        if (activity == null) {
            return;
        }

        List<PermissionGroup> groups = mPermissions.getGroups();

        PreferenceScreen screen = getPreferenceScreen();
        if (screen == null) {
            screen = getPreferenceManager().createPreferenceScreen(activity);
            setPreferenceScreen(screen);
        } else {
            screen.removeAll();
            if (mExtraScreen != null) {
                mExtraScreen.removeAll();
            }
        }

        for (PermissionGroup group : groups) {
            // Show legacy permissions only if the user chose that.
            if (!mShowLegacyPermissions && group.getDeclaringPackage().equals(OS_PKG)
                    && !Utils.isModernPermissionGroup(group.getName())) {
                continue;
            }

            Preference preference = new Preference(activity);
            preference.setOnPreferenceClickListener(this);
            preference.setKey(group.getName());
            preference.setIcon(group.getIcon());
            preference.setTitle(group.getLabel());
            preference.setPersistent(false);

            if (group.getDeclaringPackage().equals(OS_PKG)) {
                screen.addPreference(preference);
            } else {
                if (mExtraScreen == null) {
                    mExtraScreen = getPreferenceManager().createPreferenceScreen(activity);
                }
                mExtraScreen.addPreference(preference);
            }
        }

        if (mExtraScreen != null && mExtraScreen.getPreferenceCount() > 0) {
            Preference extraScreenPreference = new Preference(activity);
            extraScreenPreference.setIcon(R.drawable.ic_toc);
            extraScreenPreference.setTitle(R.string.additional_permissions);
            extraScreenPreference.setOnPreferenceClickListener(new OnPreferenceClickListener() {
                @Override
                public boolean onPreferenceClick(Preference preference) {
                    AdditionalPermissionsFragment frag = new AdditionalPermissionsFragment();
                    frag.setTargetFragment(ManagePermissionsFragment.this, 0);
                    FragmentTransaction ft = getFragmentManager().beginTransaction();
                    ft.replace(android.R.id.content, frag);
                    ft.addToBackStack("AdditionalPerms");
                    ft.commit();
                    return true;
                }
            });
            extraScreenPreference.setSummary(getString(R.string.additional_permissions_more,
                    mExtraScreen.getPreferenceCount()));
            screen.addPreference(extraScreenPreference);
        }
    }

    public static class AdditionalPermissionsFragment extends SettingsWithHeader {
        @Override
        public void onCreate(Bundle icicle) {
            super.onCreate(icicle);
            setPreferenceScreen(((ManagePermissionsFragment) getTargetFragment()).mExtraScreen);
        }

        @Override
        public void onViewCreated(View view, Bundle savedInstanceState) {
            super.onViewCreated(view, savedInstanceState);
            Resources resources = getResources();
            Theme theme = getActivity().getTheme();
            setHeader(resources.getDrawable(R.drawable.ic_toc, theme),
                    getString(R.string.additional_permissions), null);
        }
    }
}