imandaliya

[
  {
    "background_image": "#ffebee"
  },
  {
    "background_image": "#ffcdd2"
  },
  {
    "background_image": "#ef9a9a"
  },

imandaliya

    private static final String NOTIFICATION_CHANNEL_ID = "1001";
    private static final int NOTIFICATION_ID = 1001;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_demo);

        try {
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {

imandaliya

import android.content.Context;
import android.os.Handler;
import android.os.Message;
import android.support.v4.view.MotionEventCompat;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.animation.Interpolator;

imandaliya

public abstract class EndlessRecyclerViewScrollListener extends RecyclerView.OnScrollListener {
    // The minimum amount of items to have below your current scroll position
    // before loading more.
    private int visibleThreshold = 5;
    // The current offset index of data you have loaded
    private int currentPage = 0;
    // The total number of items in the dataset after the last load
    private int previousTotalItemCount = 0;
    // True if we are still waiting for the last set of data to load.
    private boolean loading = true;

imandaliya

// Smooth scroll grid view item to center using 

 private void smoothScrollToCenter(GridView gridView, View child) {
        Rect rect = new Rect();
        gridView.getGlobalVisibleRect(rect);
        gridView.smoothScrollBy(child.getBottom() - gridView.getScrollY() - rect.centerY() + child.getHeight() / 2, 200);
 }

// now call in setOnItemClickListener method

imandaliya

public class GridSpacingItemDecoration extends RecyclerView.ItemDecoration {

    private int spanCount;
    private int spacing;
    private boolean includeEdge;

    public GridSpacingItemDecoration(int spanCount, int spacing, boolean includeEdge) {
        this.spanCount = spanCount;
        this.spacing = spacing;
        this.includeEdge = includeEdge;

imandaliya

// Remove Support Animatoin
public class RecyclerViewUtils {
  ((SimpleItemAnimator) RecyclerView.getItemAnimator()).setSupportsChangeAnimations(false);
}

imandaliya

Draw smooth bitmap on canvas
https://medium.com/@ali.muzaffar/android-why-your-canvas-shapes-arent-smooth-aa2a3f450eb5

imandaliya

// get Width and height of the screen
// this method only give available space for application screen
DisplayMetrics displayMetrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(displayMetrics);
int height = displayMetrics.heightPixels;
int width = displayMetrics.widthPixels;

// get real height and width of the device

WindowManager windowManager =

imandaliya

// This method allow to handle Drawer and back functionality with state.

public class ToolbarToggleUtils {
  public static void enableViews(boolean enable) {

        // To keep states of ActionBar and ActionBarDrawerToggle synchronized,
        // when you enable on one, you disable on the other.
        // And as you may notice, the order for this operation is disable first, then enable - VERY VERY IMPORTANT.
        if(enable) {
            //You may not want to open the drawer on swipe from the left in this case