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import com.shamanland.annotations.NonNull;
import com.shamanland.annotations.Nullable;

public final class ImmutableByteArray {
    @NonNull
    private final byte[] bytes;

    @NonNull
    public byte[] getBytes() {
        return bytes.clone();

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import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.text.Editable;
import android.text.Spannable;
import android.text.SpannableStringBuilder;
import android.text.Spanned;

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ffmpeg

Converting Audio into Different Formats / Sample Rates

Minimal example: transcode from MP3 to WMA:
ffmpeg -i input.mp3 output.wma

You can get the list of supported formats with:
ffmpeg -formats

Convert WAV to MP3, mix down to mono (use 1 audio channel), set bit rate to 64 kbps and sample rate to 22050 Hz:

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openssl

Install

Install the OpenSSL on Debian based systems

sudo apt-get install openssl

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public class SimpleEncoder {
    private static final byte[] SECRET = {
            (byte) 0x9e, (byte) 0x40, (byte) 0x5e, (byte) 0xdf,
            (byte) 0xd5, (byte) 0x92, (byte) 0x90, (byte) 0x60,
            (byte) 0xfe, (byte) 0x4a, (byte) 0xaf, (byte) 0x50,
            (byte) 0x74, (byte) 0xed, (byte) 0xcb, (byte) 0x74,
    };

    public static void xor(@NonNull byte[] input, @NonNull byte[] secret, boolean x) {
        if (input.length < 1 || secret.length < 1) {

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import android.graphics.Paint;
import android.graphics.Typeface;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.text.TextPaint;
import android.text.style.MetricAffectingSpan;

/**
 * @see android.text.style.TypefaceSpan
 */

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Customizing the overall App Style

This guide has been updated for Titanium SDK 3.3.0 which uses AppCompat to bring the ActionBar to Android 2.3.x

Android has a build-in theming system. Using this feature you can easily change the base color Android uses for its controls across your app, allowing you to provide better branding and personalization, while maintaining Android's UI and UX.

Android built-in themes are:

• Holo (Mostly Black and Cyan)
• Holo Light (Mostly White and Gray)

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import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Intent;
import android.content.res.Resources;
import android.net.Uri;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.util.TypedValue;
import android.view.Gravity;
import android.view.View;

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import android.util.JsonReader;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;

import java.io.IOException;
import java.io.StringReader;
import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.HashMap;

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import android.os.Handler;
import android.util.Pair;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.arch.core.util.Function;
import androidx.lifecycle.LifecycleOwner;
import androidx.lifecycle.LiveData;
import androidx.lifecycle.MutableLiveData;
import androidx.lifecycle.Observer;