Use Math.floorDiv().

app/src/main/java/org/schabi/newpipe/fragments/list/BaseListFragment.java

@@ -215,8 +215,7 @@ public abstract class BaseListFragment<I, N> extends BaseStateFragment<I>
         final Resources resources = activity.getResources();
         int width = resources.getDimensionPixelSize(R.dimen.video_item_grid_thumbnail_image_width);
         width += (24 * resources.getDisplayMetrics().density);
-        final int spanCount = (int) Math.floor(resources.getDisplayMetrics().widthPixels
-                / (double) width);
+        final int spanCount = Math.floorDiv(resources.getDisplayMetrics().widthPixels, width);
         final GridLayoutManager lm = new GridLayoutManager(activity, spanCount);
         lm.setSpanSizeLookup(infoListAdapter.getSpanSizeLookup(spanCount));
         return lm;

app/src/main/java/org/schabi/newpipe/local/BaseLocalListFragment.java

@@ -104,8 +104,7 @@ public abstract class BaseLocalListFragment<I, N> extends BaseStateFragment<I>
         final Resources resources = activity.getResources();
         int width = resources.getDimensionPixelSize(R.dimen.video_item_grid_thumbnail_image_width);
         width += (24 * resources.getDisplayMetrics().density);
-        final int spanCount = (int) Math.floor(resources.getDisplayMetrics().widthPixels
-                / (double) width);
+        final int spanCount = Math.floorDiv(resources.getDisplayMetrics().widthPixels, width);
         final GridLayoutManager lm = new GridLayoutManager(activity, spanCount);
         lm.setSpanSizeLookup(itemListAdapter.getSpanSizeLookup(spanCount));
         return lm;

app/src/main/java/org/schabi/newpipe/streams/WebMWriter.java

@@ -652,7 +652,7 @@ public class WebMWriter implements Closeable {
 
         final int offset = withLength ? 1 : 0;
         final byte[] buffer = new byte[offset + length];
-        final long marker = (long) Math.floor((length - 1f) / 8f);
+        final long marker = Math.floorDiv(length - 1, 8);
 
         int shift = 0;
         for (int i = length - 1; i >= 0; i--, shift += 8) {

app/src/main/java/us/shandian/giga/util/Utility.java

@@ -248,10 +248,10 @@ public class Utility {
         return number < 10 ? ("0" + number) : String.valueOf(number);
     }
 
-    public static String stringifySeconds(double seconds) {
-        int h = (int) Math.floor(seconds / 3600);
-        int m = (int) Math.floor((seconds - (h * 3600)) / 60);
-        int s = (int) (seconds - (h * 3600) - (m * 60));
+    public static String stringifySeconds(final long seconds) {
+        final int h = (int) Math.floorDiv(seconds, 3600);
+        final int m = (int) Math.floorDiv(seconds - (h * 3600L), 60);
+        final int s = (int) (seconds - (h * 3600) - (m * 60));
 
         String str = "";