添加中。

app/build.gradle

@@ -26,6 +26,5 @@ dependencies {
     })
     implementation 'com.android.support:appcompat-v7:27.1.0'
     testImplementation 'junit:junit:4.12'
-    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
     implementation project(':myutils')
 }

app/src/main/java/com/humu/androidutils/MainActivity.java

@@ -1,18 +1,13 @@
 package com.humu.androidutils;
 
-import android.support.v7.app.AppCompatActivity;
 import android.os.Bundle;
-
-import com.humu.myutils.IntentUtil;
-import com.humu.myutils.MathUtil;
-import com.humu.myutils.ViewUtil;
+import android.support.v7.app.AppCompatActivity;
 
 public class MainActivity extends AppCompatActivity {
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
-
     }
 }

app/src/main/res/layout/activity_main.xml

@@ -1,19 +1,16 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.constraint.ConstraintLayout
+<LinearLayout
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
+    android:orientation="vertical"
     tools:context="com.humu.androidutils.MainActivity">
 
     <TextView
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:text="Hello World!"
-        app:layout_constraintBottom_toBottomOf="parent"
-        app:layout_constraintLeft_toLeftOf="parent"
-        app:layout_constraintRight_toRightOf="parent"
-        app:layout_constraintTop_toTopOf="parent"/>
+        android:text="Hello World!"/>
 
-</android.support.constraint.ConstraintLayout>
+</LinearLayout>

myutils/src/main/AndroidManifest.xml

@@ -1,2 +1,7 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-          package="com.humu.myutils"/>
+          package="com.humu.myutils">
+    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
+    <uses-permission android:name="android.permission.INTERNET"/>
+    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
+    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
+</manifest>