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app/src/main/java/com/gh/common/util/RandomUtils.java

@@ -0,0 +1,44 @@
+package com.gh.common.util;
+
+import java.util.Random;
+
+/**
+ * Created by LGT on 2016/6/7.
+ */
+public class RandomUtils {
+
+    /*
+     * 从 size 范围内随机 count 个不重复的数字
+     */
+    public static int[] getRandomArray(int count, int size) {
+        int[] index = new int[count];
+        Random random = new Random(System.currentTimeMillis());
+        for (int i = 0; i < index.length; i++) {
+            if (i == 0) {
+                index[i] = random.nextInt(size);
+            } else {
+                random(random, index, i, size);
+            }
+        }
+        return index;
+    }
+
+    private static int random(Random random, int[] index, int i, int size) {
+        int seed = random.nextInt(size);
+        for (int j = 0; j < i; j++) {
+            if (index[j] == seed) {
+                return random(random, index, i, size);
+            }
+        }
+        return seed;
+    }
+
+    /*
+     * 从 size 范围内随机一个数字
+     */
+    public static int nextInt(int size) {
+        Random random = new Random(System.currentTimeMillis());
+        return random.nextInt(size);
+    }
+
+}