AS 中并沒有獨立的 Module 工程，但是可以在普通的 Project 中加入 Module。所謂的 Module 就是我們通常所指的模塊化的一個單元，并常常以 jar 包的形式存在。下面以一個獲取手機信息的例子演示 AS 中的模塊化。

一、項目中新建 Module

File—>New Module，詳細見下圖。

http://wiki.jikexueyuan.com/project/android-actual-combat-skills/images/19-1.png" alt="fig.1" />

http://wiki.jikexueyuan.com/project/android-actual-combat-skills/images/19-2.png" alt="fig.2" />

http://wiki.jikexueyuan.com/project/android-actual-combat-skills/images/19-3.png" alt="fig.3" />

二、新建 Java 類

新建一個 PhoneInfo 類，內容如下：

    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型號  //2-cpu頻率
            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";// 系統(tǒng)內存信息文件
            String str2;
            String[] arrayOfString;
            long initial_memory = 0;

            try {
                FileReader localFileReader = new  FileReader(str1);
                BufferedReader localBufferedReader = new BufferedReader(
                        localFileReader, 8192);
                str2 = localBufferedReader.readLine();// 讀取meminfo第一行，系統(tǒng)總內存大小

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

                initial_memory = Integer.valueOf(arrayOfString[1]).intValue() * 1024;// 獲得系統(tǒng)總內存，單位是KB，乘以1024轉換為Byte
                localBufferedReader.close();

            } catch (IOException e) {
            }
            return Formatter.formatFileSize(mContext, initial_memory);// Byte轉換為KB或者MB，內存大小規(guī)格化
        }
    }

并在 Module 的 AndroidManifest 文件中加入兩個權限：

        <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 中加入測試代碼：

        @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

項目編譯之后 jar 會在下面的目錄找到：

    ./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 中將此 module“減“掉后才能在項目中 Module 右鍵的 Delete 鍵可用。

http://wiki.jikexueyuan.com/project/android-actual-combat-skills/images/19-4.png" alt="fig.4" />