GestureChangeNotificationActivity.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.talkback;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.NotificationManager;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.text.SpannableStringBuilder;

import com.android.utils.SharedPreferencesUtils;

public class GestureChangeNotificationActivity extends Activity {

    private SharedPreferences mPrefs;

    /**
     * The available shortcut gestures and their default actions. The default action for
     * the gesture specified by mGestureNameRes[i] is the action specified by mActionNameRes[i].
     */
    private final int[] mGestureNameRes = {
            R.string.title_pref_shortcut_down_and_left,
            R.string.title_pref_shortcut_up_and_left,
            R.string.title_pref_shortcut_down_and_right,
            R.string.title_pref_shortcut_up_and_right,
            R.string.title_pref_shortcut_right_and_down,
            R.string.title_pref_shortcut_left_and_down,
            R.string.title_pref_shortcut_right_and_up,
            R.string.title_pref_shortcut_left_and_up
    };
    private final int[] mActionNameRes = {
            R.string.shortcut_back,
            R.string.shortcut_home,
            R.string.shortcut_talkback_breakout,
            R.string.shortcut_local_breakout,
            R.string.shortcut_notifications,
            R.string.shortcut_unassigned,
            R.string.shortcut_unassigned,
            R.string.shortcut_overview
    };

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

        mPrefs = SharedPreferencesUtils.getSharedPreferences(this);

        final CharSequence dialogTitle = getString(
                R.string.notification_title_talkback_gestures_changed);
        final CharSequence dialogMessage = getString(
                R.string.talkback_gesture_change_details,
                getMappingDescription(mGestureNameRes, mActionNameRes));
        final CharSequence acceptButtonText = getString(
                R.string.button_accept_changed_gesture_mappings);
        final OnClickListener acceptButtonListener = new OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                clearPreviouslyConfiguredMappings();
                dismissNotification();
                dialog.dismiss();
                finish();
            }
        };
        final CharSequence customizeButtonText = getString(
                R.string.button_customize_gesture_mappings);
        final OnClickListener customizeButtonListener = new OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                clearPreviouslyConfiguredMappings();
                dismissNotification();
                dialog.dismiss();
                final Intent shortcutsIntent = new Intent(
                        getApplicationContext(),
                        TalkBackShortcutPreferencesActivity.class);
                startActivity(shortcutsIntent);
                finish();
            }
        };

        new AlertDialog.Builder(this)
                .setTitle(dialogTitle)
                .setMessage(dialogMessage)
                .setCancelable(false)
                .setPositiveButton(acceptButtonText, acceptButtonListener)
                .setNeutralButton(customizeButtonText, customizeButtonListener)
                .create()
                .show();
    }

    private void clearPreviouslyConfiguredMappings() {
        final SharedPreferences.Editor editor = mPrefs.edit();

        editor.remove(getString(R.string.pref_shortcut_down_and_left_key));
        editor.remove(getString(R.string.pref_shortcut_down_and_right_key));
        editor.remove(getString(R.string.pref_shortcut_up_and_left_key));
        editor.remove(getString(R.string.pref_shortcut_up_and_right_key));
        editor.remove(getString(R.string.pref_shortcut_right_and_down_key));
        editor.remove(getString(R.string.pref_shortcut_right_and_up_key));
        editor.remove(getString(R.string.pref_shortcut_left_and_down_key));
        editor.remove(getString(R.string.pref_shortcut_left_and_up_key));

        editor.apply();
    }

    private CharSequence getMappingDescription(int[] directions, int[] mappings) {
        SpannableStringBuilder sb = new SpannableStringBuilder();

        for (int i = 0; i < directions.length; ++i) {
            sb.append(getString(directions[i]))
            .append(": ")
            .append(getString(mappings[i]))
            .append("\n");
        }

        return sb;
    }

    private void dismissNotification() {
        final int notificationId = TalkBackUpdateHelper.GESTURE_CHANGE_NOTIFICATION_ID;
        final NotificationManager nm = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
        nm.cancel(notificationId);

        // Clear the flag signaling TalkBack to display the notification again
        final SharedPreferences.Editor editor = mPrefs.edit();
        editor.remove(getString(R.string.pref_must_accept_gesture_change_notification));
        editor.apply();
    }
}