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        try {  // this hide ActionBar in Android app
            getWindow().requestFeature(Window.FEATURE_ACTION_BAR);
            getActionBar().hide();
        } catch (NullPointerException ignore) {
        }

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public static final String PREFERENCES_FILE = "preferences.txt";

SharedPreferences preferences = this.getSharedPreferences(PREFERENCES_FILE, MODE_PRIVATE);
String pref1Value = preferences.getString("PREF_1", "");  // This get value of PREF_1 key
SharedPreferences.Editor edit = preferences.edit();
edit.putString("key", "value");  // This put value to PREF_1 key
edit.commit();  // This write preferences to disk

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package net.neatapps.avi.app.util;

import android.app.Activity;
import android.content.ComponentName;
import android.content.Intent;
import android.content.pm.ActivityInfo;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.net.Uri;
import android.os.Build;

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<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:state_enabled="true" android:state_pressed="true">
        <layer-list>
            <!-- button background shadow -->
            <item android:left="2dp" android:top="2dp">
                <shape android:shape="rectangle">
                    <solid android:color="@color/blue_shadow" />
                    <corners android:radius="6dp" />

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<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:state_enabled="true" android:state_pressed="true">
        <layer-list>
            <!-- button background shadow -->
            <item android:left="1dp" android:top="1dp">
                <shape android:shape="rectangle">
                    <stroke android:width="3dp" android:color="@color/blue_shadow" />
                    <solid android:color="@color/transparent" />

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<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <!-- Selected -->
    <item android:state_focused="true" android:state_pressed="false">
        <shape>
            <solid android:color="#00ffffff" />
        </shape>
    </item>

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<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools">

    <!-- Selected -->
    <item android:state_focused="true" android:state_pressed="false">
        <shape>
            <solid android:color="#00ffffff" />
        </shape>
    </item>

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package co.neatapps.android.samples;

import android.content.Context;
import android.content.SharedPreferences;

import java.lang.reflect.ParameterizedType;

public class Prefs {
    public static final ValueWrapper<Boolean> SAMPLE_BOOL_TOKEN = new ValueWrapper<Boolean>("SAMPLE_BOOL_TOKEN", false) {
    };

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package net.nemanjakovacevic.recyclerviewswipetodelete;

import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.graphics.drawable.Drawable;
import android.support.v7.widget.RecyclerView;
import android.view.View;

class MyItemDecoration extends RecyclerView.ItemDecoration {

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/*
   Copyright 2018 *********.

   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