java reflection example

*.java

package org.telegram.ui.Custom;

import java.lang.reflect.Field;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.Callable;
import java.util.function.BooleanSupplier;
import java.util.function.Consumer;
import java.util.function.Function;

import android.content.Context;
import android.content.SharedPreferences;
import android.util.TypedValue;
import android.widget.LinearLayout;
import android.widget.TextView;

import org.telegram.messenger.ApplicationLoader;
import org.telegram.messenger.MessagesController;
import org.telegram.messenger.SharedConfig;

import org.telegram.ui.ActionBar.Theme;
import org.telegram.ui.ActionBar.AlertDialog;
//import org.telegram.ui.Cells.CheckBoxCell;
import org.telegram.ui.Cells.TextCheckCell;
import org.telegram.ui.Components.LayoutHelper;


public class AdditionalSettingsHelper {
	static {
		initAllFields();
	}

	private static SharedPreferences preferences_ = null;

	private static Field[] fields_ = null;
	private static HashMap<String, Field> fieldHashMap_ = new HashMap<String, Field>();

	private static void initAllFields() {
		fields_= AdditionalSettingsHelper.class.getFields();
		for(int i = 0, l = fields_.length; i < l; i++) {
			fieldHashMap_.put(fields_[i].getName(), fields_[i]);
		}
	}

	private static String configKey = "additionalSettings";

	private static boolean configLoaded;
	private static final Object sync = new Object();

	// region DontSendTyping
	public static boolean bDontSendTyping;

	// region DontSendTextTyping
	public static boolean bDontSendTextTyping;
	public static boolean bDontSendTextTypingInRegularChats;
	public static boolean bDontSendTextTypingInSecretChats;
	public static boolean bDontSendTextTypingInSupergroupChats;
	// endregion DontSendTextTyping

	// endregion DontSendTyping

	// region DontSendTyping
	public static boolean bNoFlagSecureInSecretChats;
	public static boolean bNoFlagSecureInSecretChatsPhotoViewer;
	public static boolean bNoFlagSecureInDisposablePhotoViewer;
	public static boolean bNoSecretMessageRead;
	public static boolean bNoSecretMessageReadInEncryptedChats;
	public static boolean bDontUpdateDestroyTime;
	public static boolean bIgnoreDestroyTimer;
	public static boolean bIgnoreCreateTaskForSecretChat;
	public static boolean bIgnoreCreateTaskForMid;
	public static boolean bIgnoreMarkMessageContentAsRead;
	public static boolean bIgnoreMarkDialogAsRead;

	// region
	private static String g_szDontSendTextTyping = "Don't send typing";
	private static String g_szDontSendTextTyping_Description = "Don't send typing on text message writing";

	private static String g_szDontSendTextTypingInRegularChats = "In regular chats";
	private static String g_szDontSendTextTypingInRegularChats_Description = "Don't send 'typing...' in regular chats";

	private static String g_szDontSendTextTypingInSecretChats = "In secret chats";
	private static String g_szDontSendTextTypingInSecretChats_Description = "Don't send 'typing...' in secret chats";

	private static String g_szDontSendTextTypingInSupergroupChats = "In super group chats";
	private static String g_szDontSendTextTypingInSupergroupChats_Description = "Don't send 'typing...' in super group chats";
	// endregion
	// endregion DontSendTyping

	private static TextCheckCell addNewTextCellWithValue(Context context, String text, String value, boolean checked, boolean divider) {
		final TextCheckCell pCell = new TextCheckCell(context);
		pCell.setTextAndValueAndCheck(text, value, checked, true, divider);
		pCell.setOnClickListener(v -> pCell.setChecked(fn.getAsBoolean()));
		return pCell;
	}

	public static void showSettings(final Context context) {
		LinearLayout ll = new LinearLayout(context);
		ll.setOrientation(LinearLayout.VERTICAL);

		// region
		TextView warning = new TextView(context);
		warning.setTextSize(TypedValue.COMPLEX_UNIT_DIP, 15);
		warning.setText("Please only change these settings if you know exactly what they do.");
		warning.setTextColor(Theme.getColor(Theme.key_dialogTextBlack));
		ll.addView(warning, LayoutHelper.createLinear(LayoutHelper.MATCH_PARENT, LayoutHelper.WRAP_CONTENT, 16, 8, 16, 8));
		// endregion

		TextCheckCell pCell = null;

		// region DontSendTextTyping2
		pCell = addNewTextCellWithValue(context, g_szDontSendTextTyping, g_szDontSendTextTyping_Description, bDontSendTyping,false, "bDontSendTyping");
		ll.addView(pCell);

		pCell = addNewTextCellWithValue(context, g_szDontSendTextTypingInRegularChats, g_szDontSendTextTypingInRegularChats_Description, bDontSendTyping,false, AdditionalSettingsHelper::bDontSendTyping);
		ll.addView(pCell);

		pCell = addNewTextCellWithValue(context, g_szDontSendTextTypingInSecretChats, g_szDontSendTextTypingInSecretChats_Description, bDontSendTyping,false, AdditionalSettingsHelper::bDontSendTyping);
		ll.addView(pCell);

		pCell = addNewTextCellWithValue(context, g_szDontSendTextTypingInSupergroupChats, g_szDontSendTextTypingInSupergroupChats_Description, bDontSendTyping,false, AdditionalSettingsHelper::bDontSendTyping);
		ll.addView(pCell);
		// endregion DontSendTextTyping


		pCell = addNewTextCellWithValue(context, g_szDontSendTextTypingInSupergroupChats, g_szDontSendTextTypingInSupergroupChats_Description, bDontSendTyping,false, AdditionalSettingsHelper::bDontSendTyping);
		ll.addView(pCell);


		new AlertDialog.Builder(context)
				.setTitle("Title")
				.setView(ll)
				.show();
	}

	public static void loadConfig() throws IllegalAccessException {
        synchronized (sync) {
            if (configLoaded || ApplicationLoader.applicationContext == null) {
                return;
            }

			preferences_ = ApplicationLoader.applicationContext.getSharedPreferences(configKey, Context.MODE_PRIVATE);

			Field tempField = null;
			boolean bTempValue = false;
			for(int i = 0, l = fieldHashMap_.size(); i < l; i++) {
				tempField = fields_[i];
				tempField.setBoolean(null, preferences_.getBoolean(tempField.getName(), true));
			}

            configLoaded = true;
        }
    }

	public static boolean bToggleAndReturnValue(String name) throws IllegalAccessException {
		Field tempField = fieldHashMap_.get(name);
		if(tempField == null) return false;

		SharedPreferences.Editor editor = preferences_.edit();

		boolean value = tempField.getBoolean(null);
		value = !value;
		tempField.setBoolean(null, value);

		editor.putBoolean(name, value);
		editor.commit();

		return value;
	}
}