添加百分比按时间内规定变化

app/src/main/java/com/mints/flowbox/ui/widgets/NumAnimUtil.java

+package com.mints.flowbox.ui.widgets;
+
+import android.widget.TextView;
+
+import java.util.LinkedList;
+import java.util.Random;
+
+/**
+ * 描述：
+ * 作者：孟崔广
+ * 时间：2021/7/7 15:20
+ */
+public class NumAnimUtil {
+    //每秒刷新多少次
+    private static final int COUNTPERS = 100;
+
+    public static void startAnim(TextView textV, float num) {
+        startAnim(textV, num, 2000);
+    }
+
+    public static void startAnim(TextView textV, float num, long time) {
+        if (num == 0) {
+            textV.setText(NumAnimUtil.NumberFormat(num, 2));
+            return;
+        }
+
+        Float[] nums = splitnum(num, (int) ((time / 1000f) * COUNTPERS));
+
+        Counter counter = new Counter(textV, nums, time);
+
+        textV.removeCallbacks(counter);
+        textV.post(counter);
+    }
+
+    private static Float[] splitnum(float num, int count) {
+        Random random = new Random();
+        float numtemp = num;
+        float sum = 0;
+        LinkedList<Float> nums = new LinkedList<Float>();
+        nums.add(0f);
+        while (true) {
+            float nextFloat = NumAnimUtil.NumberFormatFloat(
+                    (random.nextFloat() * num * 2f) / (float) count,
+                    2);
+            System.out.println("next:" + nextFloat);
+            if (numtemp - nextFloat >= 0) {
+                sum = NumAnimUtil.NumberFormatFloat(sum + nextFloat, 2);
+                nums.add(sum);
+                numtemp -= nextFloat;
+            } else {
+                nums.add(num);
+                return nums.toArray(new Float[0]);
+            }
+        }
+    }
+
+    static class Counter implements Runnable {
+
+        private final TextView view;
+        private Float[] nums;
+        private long pertime;
+
+        private int i = 0;
+
+        Counter(TextView view, Float[] nums, long time) {
+            this.view = view;
+            this.nums = nums;
+            this.pertime = time / nums.length;
+        }
+
+        @Override
+        public void run() {
+            if (i > nums.length - 1) {
+                view.removeCallbacks(Counter.this);
+                return;
+            }
+            view.setText(NumAnimUtil.NumberFormat(nums[i++], 2));
+            view.removeCallbacks(Counter.this);
+            view.postDelayed(Counter.this, pertime);
+        }
+    }
+
+    public static String NumberFormat(float f, int m) {
+        return String.format("%." + m + "f", f);
+    }
+
+    public static float NumberFormatFloat(float f, int m) {
+        String strfloat = NumberFormat(f, m);
+        return Float.parseFloat(strfloat);
+    }
+}