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// Convert Imageview to grayscale
private void convertToGrayScale(ImageView imageView, boolean convert) {
    if (!convert) {
        ColorMatrix matrix = new ColorMatrix();
        matrix.setSaturation(0);

        ColorMatrixColorFilter filter = new ColorMatrixColorFilter(matrix);
        imageView.setColorFilter(filter);
    } else {
        imageView.setColorFilter(null);

akuafif

import android.content.Context;
import android.graphics.Canvas;
import android.util.AttributeSet;
import android.view.Gravity;
import android.widget.TextView;
 
public class VerticalTextView extends TextView {
    final boolean topDown;

    public VerticalTextView(Context context, AttributeSet attrs){

akuafif

// The Date Format
final static String DATE_FORMAT = "dd-MM-yyyy";

public static boolean isDateValid(String inputDate) {
    try {
        DateFormat df = new SimpleDateFormat(DATE_FORMAT);
        df.setLenient(false);
        df.parse(inputDate);
        return true;
    } catch (ParseException e) {

akuafif

public static boolean isEmailValid(CharSequence email) {
    return android.util.Patterns.EMAIL_ADDRESS.matcher(email).matches();
}

akuafif

import java.util.Arrays;
import java.util.List;
import java.util.concurrent.TimeUnit;

public class TimeAgo {
    public static final List<Long> times = Arrays.asList(
            TimeUnit.DAYS.toMillis(365),
            TimeUnit.DAYS.toMillis(30),
            TimeUnit.DAYS.toMillis(1),
            TimeUnit.HOURS.toMillis(1),

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// disable edittext
editText.setFocusable(false);

// enable edittext
editText.setFocusable(true);
editText.setFocusableInTouchMode(true);

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// Useful for viewPagers.

public class MyFragment extends Fragment {
  @Override
  public void setUserVisibleHint(boolean isVisibleToUser) {
    super.setUserVisibleHint(isVisibleToUser);
    if (isVisibleToUser) { 
        // User is viewing the fragment,
        // or fragment is inside the screen
        doYourThing();

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DisplayMetrics metrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);

// With Picasso
Picasso .with(this)
        .load(pictureURI)
        .resize(metrics.widthPixels, metrics.heightPixels)
        .centerCrop()
        .into(imageView);

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private void hideKeyboard(){
    InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
    imm.hideSoftInputFromWindow(edittext.getWindowToken(), InputMethodManager.HIDE_NOT_ALWAYS);
}

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// A simple c++ program to
// illustrate basic encryption
// and decryption
#include<iostream>

using namespace std;

void encrypt(char *);
void decrypt(char *);