see 05/18 log

utilcode/src/main/java/com/blankj/utilcode/util/ThreadUtils.java

+package com.blankj.utilcode.util;
+
+import android.os.Looper;
+
+/**
+ * <pre>
+ *     author: Blankj
+ *     blog  : http://blankj.com
+ *     time  : 2018/05/17
+ *     desc  :
+ * </pre>
+ */
+public class ThreadUtils {
+
+    /**
+     * Returns {@code true} if called on the main thread, {@code false} otherwise.
+     */
+    public static boolean isOnMainThread() {
+        return Looper.myLooper() == Looper.getMainLooper();
+    }
+
+    /**
+     * Returns {@code true} if called on a background thread, {@code false} otherwise.
+     */
+    public static boolean isOnBackgroundThread() {
+        return !isOnMainThread();
+    }
+
+
+}