app_Settings/src/com/android/settings/applications/ManageAssist.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.applications;

import android.app.AlertDialog;
import android.content.ComponentName;
import android.content.DialogInterface;
import android.os.Bundle;
import android.preference.Preference;
import android.preference.SwitchPreference;
import android.provider.Settings;

import com.android.internal.logging.MetricsLogger;
import com.android.settings.InstrumentedFragment;
import com.android.settings.R;
import com.android.settings.SettingsPreferenceFragment;
import com.android.settings.voice.VoiceInputListPreference;

/**
 * Settings screen to manage everything about assist.
 */
public class ManageAssist extends SettingsPreferenceFragment
        implements Preference.OnPreferenceChangeListener {

    private static final String KEY_DEFAULT_ASSIST = "default_assist";
    private static final String KEY_CONTEXT = "context";
    private static final String KEY_VOICE_INPUT = "voice_input_settings";

    private DefaultAssistPreference mDefaultAssitPref;
    private SwitchPreference mContextPref;
    private VoiceInputListPreference mVoiceInputPref;

    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        addPreferencesFromResource(R.xml.manage_assist);

        mDefaultAssitPref = (DefaultAssistPreference) findPreference(KEY_DEFAULT_ASSIST);
        mDefaultAssitPref.setOnPreferenceChangeListener(this);

        mContextPref = (SwitchPreference) findPreference(KEY_CONTEXT);
        mContextPref.setChecked(Settings.Secure.getInt(getContentResolver(),
                Settings.Secure.ASSIST_STRUCTURE_ENABLED, 1) != 0);
        mContextPref.setOnPreferenceChangeListener(this);

        mVoiceInputPref = (VoiceInputListPreference) findPreference(KEY_VOICE_INPUT);
        updateUi();
    }

    @Override
    protected int getMetricsCategory() {
        return MetricsLogger.APPLICATIONS_MANAGE_ASSIST;
    }

    @Override
    public boolean onPreferenceChange(Preference preference, Object newValue) {
        if (preference == mContextPref) {
            Settings.Secure.putInt(getContentResolver(), Settings.Secure.ASSIST_STRUCTURE_ENABLED,
                    (boolean) newValue ? 1 : 0);
            return true;
        }
        if (preference == mDefaultAssitPref) {
            String newAssitPackage = (String)newValue;
            if (newAssitPackage == null ||
                    newAssitPackage.contentEquals(DefaultAssistPreference.ITEM_NONE_VALUE)) {
                setDefaultAssist(DefaultAssistPreference.ITEM_NONE_VALUE);
                return false;
            }

            final String currentPackage = mDefaultAssitPref.getValue();
            if (currentPackage == null || !newAssitPackage.contentEquals(currentPackage)) {
                confirmNewAssist(newAssitPackage);
            }
            return false;
        }
        return false;
    }

    private void updateUi() {
        mDefaultAssitPref.refreshAssistApps();

        final ComponentName currentAssist = mDefaultAssitPref.getCurrentAssist();
        final boolean hasAssistant = currentAssist != null;
        if (hasAssistant) {
            getPreferenceScreen().addPreference(mContextPref);
        } else {
            getPreferenceScreen().removePreference(mContextPref);
        }

        mVoiceInputPref.setAssistRestrict(currentAssist);
        mVoiceInputPref.refreshVoiceInputs();
    }

    private void confirmNewAssist(final String newAssitPackage) {
        final int selected = mDefaultAssitPref.findIndexOfValue(newAssitPackage);
        final CharSequence appLabel = mDefaultAssitPref.getEntries()[selected];

        final String title = getString(R.string.assistant_security_warning_title, appLabel);
        final String message = getString(R.string.assistant_security_warning, appLabel);

        final DialogInterface.OnClickListener onAgree = new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                setDefaultAssist(newAssitPackage);
            }
        };

        AlertDialog.Builder builder = new AlertDialog.Builder(getContext());
        builder.setTitle(title)
                .setMessage(message)
                .setCancelable(true)
                .setPositiveButton(R.string.assistant_security_warning_agree, onAgree)
                .setNegativeButton(R.string.assistant_security_warning_disagree, null);
        AlertDialog dialog = builder.create();
        dialog.show();
    }

    private void setDefaultAssist(String assistPackage) {
        mDefaultAssitPref.setValue(assistPackage);
        updateUi();
    }
}