mahdi-malv

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.View;

public class ListClick implements RecyclerView.OnItemTouchListener {
    private GestureDetector gestureDetector;
    private ClickListener clickListener;

mahdi-malv

/**
 * Creates a 3D flip animation between two views.
 *
 * @param fromView First view in the transition.
 * @param toView Second view in the transition.
 */
class FlipAnimation(private var fromView: View?, private var toView: View?) : Animation() {
    private var camera: Camera? = null

    private var centerX: Float = 0.toFloat()

mahdi-malv

//Ted Permission is a great permission library to manage Runtime permission added since Android 6.0(Marshmallow)
//This example Uses RxJava 2 to get permission.
/**
 * <b>Remember this need one dependency code</b>
 * Code: implementation 'gun0912.ted:tedpermission-rx2:2.2.0' // Or later
 * Might also need: implementation 'io.reactivex.rxjava2:rxandroid:2.0.2' //Or later
 * @param c is the Context
 * @param deniedTitle is the Title when permission denied and you are showing a message that you need it
 * @param deniedMessage is the Message
 * @param doWithPermissionResult is a function that has a Boolean. If true the permission is granted

mahdi-malv

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.View;

public class ListClick implements RecyclerView.OnItemTouchListener {

mahdi-malv

public void singleFadeInView(View v, long duration, final Consumer<Animation> onAnimEnd) {
        AlphaAnimation anim = new AlphaAnimation(1.0f, 0.0f);
        anim.setDuration(duration);
        anim.setAnimationListener(new Animation.AnimationListener() {
            @Override
            public void onAnimationStart(Animation animation) {}
            @Override
            public void onAnimationEnd(Animation animation) {
                onAnimEnd.accept(animation);

mahdi-malv

//Check network with RxJava2

@SuppressLint("MissingPermission") // AccessNetworkState -> Add it yourself
fun isInternetOn(context: Context): Observable<Boolean> {
    val connectivityManager = context.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
    val activeNetworkInfo: NetworkInfo?
    activeNetworkInfo = connectivityManager.activeNetworkInfo
    return Observable.just(activeNetworkInfo != null && activeNetworkInfo.isConnected)
      .map { it }
      .distinctUntilChanged()

mahdi-malv

//Double click detection
var timeSaver = 0L // Globaly
view.setOnTouchListener { _, event ->
    when(event.action) {
        MotionEvent.ACTION_DOWN -> {
            if (System.currentTimeMillis() - timeSaver <= 500) {
              // Do with double click
                Toast.makeText(this, "DOUBLE_CLICK", Toast.LENGTH_SHORT).show()
            }
            timeSaver = System.currentTimeMillis()

mahdi-malv

//Sort objects by a value

Collections.sort(songList, new Comparator<Song>(){
  public int compare(Song a, Song b){
    // Here song is a class that has some attrs including title.
    // We want to sort songs by title
    return a.getTitle().compareTo(b.getTitle());
  }
});

mahdi-malv

public static float dpOrSpToPx(final Context context, final float dpOrSpValue) {
   return dpOrSpValue * context.getResources().getDisplayMetrics().density;
}

mahdi-malv

//تشخیص اسکرول کردن در لیست
recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
    @Override
    public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
        if (dy > 0) {
            //Scrolling down
        } else if (dy < 0) {
            //Scrolling up
        }