AS中并没有独立的Module 工程，但是可以在普通的Project中加入Module。所谓的Module就是我们通常所指的模块化的一个单元，并常常以jar包的形式存在。下面以一个获取手机信息的例子演示AS中的模块化。

一、项目中新建Module

File—>New Module，详细见下图。 
 
 

二、新建Java类

新建一个PhoneInfo类，内容如下：

package com.linc.mylibrary;

import android.content.Context;
import android.net.wifi.WifiInfo;
import android.net.wifi.WifiManager;
import android.os.Build;
import android.telephony.TelephonyManager;
import android.text.format.Formatter;
import android.util.Log;

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;

/**
 * Created by linc on 15-3-19.
 */
public class PhoneInfo {
    private String TAG = "PhoneInfo";
    private Context mContext;
    private TelephonyManager mPhoneManager;

    public PhoneInfo(Context context) {
        mContext = context;
        mPhoneManager = (TelephonyManager)mContext.getSystemService(Context.TELEPHONY_SERVICE);
    }

    public String getDeviceId() {
        return mPhoneManager.getDeviceId();
    }

    public String getPhoneModule() {
        return Build.MODEL;
    }

    public String getSerialNumber() {
        return Build.SERIAL;
    }

    public String getPhoneNumber() {
        return mPhoneManager.getLine1Number();
    }

    public String getMacAddress(){
        String result = "";
        WifiManager wifiManager = (WifiManager) mContext.getSystemService(Context.WIFI_SERVICE);
        WifiInfo wifiInfo = wifiManager.getConnectionInfo();
        result = wifiInfo.getMacAddress();
        Log.i(TAG, "macAdd:" + result);
        return result;
    }

    public String[] getCpuInfo() {
        String str1 = "/proc/cpuinfo";
        String str2 = "";
        String[] cpuInfo = {"", ""};  //1-cpu型号  //2-cpu频率
        String[] arrayOfString;
        try {
            FileReader fr = new FileReader(str1);
            BufferedReader localBufferedReader = new BufferedReader(fr, 8192);
            str2 = localBufferedReader.readLine();
            arrayOfString = str2.split("s+");
            for (int i = 2; i < arrayOfString.length; i++) {
                cpuInfo[0] = cpuInfo[0] + arrayOfString[i] + " ";
            }
            str2 = localBufferedReader.readLine();
            arrayOfString = str2.split("s+");
            cpuInfo[1] += arrayOfString[2];
            localBufferedReader.close();
        } catch (IOException e) {
        }
        Log.i(TAG, "cpuinfo:" + cpuInfo[0] + " " + cpuInfo[1]);
        return cpuInfo;
    }

    public String getTotalMemory() {
        String str1 = "/proc/meminfo";// 系统内存信息文件
        String str2;
        String[] arrayOfString;
        long initial_memory = 0;

        try {
            FileReader localFileReader = new FileReader(str1);
            BufferedReader localBufferedReader = new BufferedReader(
                    localFileReader, 8192);
            str2 = localBufferedReader.readLine();// 读取meminfo第一行，系统总内存大小

            arrayOfString = str2.split("s+");
            for (String num : arrayOfString) {
                Log.i(str2, num + "	");
            }

            initial_memory = Integer.valueOf(arrayOfString[1]).intValue() * 1024;// 获得系统总内存，单位是KB，乘以1024转换为Byte
            localBufferedReader.close();

        } catch (IOException e) {
        }
        return Formatter.formatFileSize(mContext, initial_memory);// Byte转换为KB或者MB，内存大小规格化
    }
}

并在Module的AndroidManifest文件中加入两个权限：

    <uses-permission android:name="android.permission.READ_PHONE_STATE" />
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>

三、app中引入此module

在app的build.gradle中加入此module的dependency，如下：

dependencies {
    compile "com.android.support:appcompat-v7:21.0.3"
    compile project(":mylibrary")
}

在app的MainActivity中加入测试代码：

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        PhoneInfo info = new PhoneInfo(this);
        Log.d(TAG,"devices id: "+info.getDeviceId());
        Log.d(TAG,"getPhoneModule: "+info.getPhoneModule());
        Log.d(TAG,"getSerialNumber: "+info.getSerialNumber());
        Log.d(TAG,"getPhoneNumber: "+info.getPhoneNumber());
        Log.d(TAG,"getMacAddress: "+info.getMacAddress());
        Log.d(TAG,"getCpuInfo: "+info.getCpuInfo());
        Log.d(TAG,"getTotalMemory: "+info.getTotalMemory());
    }

四、jar的生成

项目编译之后jar会在下面的目录找到：

./mylibrary/build/intermediates/bundles/debug/classes.jar
./mylibrary/build/intermediates/bundles/release/classes.jar

五、Module的移除

先要在File—>Project Structure中将此module“减“掉后才能在项目中Module右键的Delete键可用。 

参考： 
http://www.cnblogs.com/wuya/p/android-studio-gradle-export-jar-assets.html 

http://www.cnblogs.com/helloandroid/articles/2210334.html 

http://blog.csdn.net/hyr83960944/article/details/37519299