使用AIDL調用遠程服務設置系統時間

在實際工作中，經常遇到客戶需要用代碼設置系統時間的需求，但是Android非系統應用是無法設置系統時間的。於是，我設計了一個使用系統簽名的時間設置服務，客戶通過bind調用服務里的方法就能達到設置時間的目的。

這裡用到的技術有：

1、Signapk簽名

2、AIDL

3、bind service

將應用變成系統應用

1、AndroidManifest.xml中加入android:sharedUserId="android.uid.system"

2、使用系統密鑰簽名。系統簽名在Android源碼目錄中的位置是"build\target\product\security"，下麵的platform.pk8和platform.x509.pem兩個文件。然後用Android提供的Signapk工具來簽名，signapk的源代碼是在"build\tools\signapk"下，用法為"signapk platform.x509.pem platform.pk8 input.apk output.apk"

時間設置服務 CustomServices

ICustomServices.aidl 里定義了設置日期和設置時間方法

1 interface ICustomServices {
2 
3      void setDate(int year,int month,int day);
4      void setTime(int hourOfDay, int minute);
5 
6 }

CustomService.Java   

 1 public class CustomService extends Service {
 2     private static final String TAG = CustomService.class.getSimpleName();
 3 
 4     private MyBinder mBinder;
 5 
 6     @Override
 7     public void onCreate() {
 8         super.onCreate();
 9 
10         if (mBinder == null) {
11             mBinder = new MyBinder();
12         }
13 
14     }
15 
16 
17     @Override
18     public IBinder onBind(Intent intent) {
19         return mBinder;
20     }
21 
22 
23     class MyBinder extends ICustomServices.Stub {
24 
25         @Override
26         public void setDate(int year, int month, int day) throws RemoteException {
27 
28             setDate(CustomService.this, year, month - 1, day);
29         }
30 
31         @Override
32         public void setTime(int hourOfDay, int minute) throws RemoteException {
33             setTime(CustomService.this, hourOfDay, minute);
34         }
35 
36         void setDate(Context context, int year, int month, int day) {
37             Calendar c = Calendar.getInstance();
38 
39             c.set(Calendar.YEAR, year);
40             c.set(Calendar.MONTH, month);
41             c.set(Calendar.DAY_OF_MONTH, day);
42             long when = c.getTimeInMillis();
43 
44             if (when / 1000 < Integer.MAX_VALUE) {
45                 ((AlarmManager) context.getSystemService(Context.ALARM_SERVICE)).setTime(when);
46             }
47         }
48 
49         void setTime(Context context, int hourOfDay, int minute) {
50             Calendar c = Calendar.getInstance();
51 
52             c.set(Calendar.HOUR_OF_DAY, hourOfDay);
53             c.set(Calendar.MINUTE, minute);
54             c.set(Calendar.SECOND, 0);
55             c.set(Calendar.MILLISECOND, 0);
56             long when = c.getTimeInMillis();
57 
58             if (when / 1000 < Integer.MAX_VALUE) {
59                 ((AlarmManager) context.getSystemService(Context.ALARM_SERVICE)).setTime(when);
60             }
61         }
62     }
63     
64 }

 AndroidManifest.xml

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
 3     package="com.rs.customservices" android:sharedUserId="android.uid.system">
 4     <application
 5         android:allowBackup="true"
 6         android:icon="@mipmap/ic_launcher"
 7         android:label="@string/app_name"
 8         android:supportsRtl="true"
 9         android:theme="@style/AppTheme">
10 
11 
12         <service
13             android:name="com.rs.customservices.CustomService"
14             android:enabled="true"
15             android:exported="true">
16             <intent-filter>
17                 <action android:name="com.rs.CustomService" />
18             </intent-filter>
19         </service>
20     </application>
21 
22 </manifest>

編譯完後使用系統簽名將APK文件簽名成系統應用。

 客戶程式

 將上面工程中的 ICustomServices.aidl 拷入到客戶工程中，註意：包的目錄結構也需要拷入。

CustomServiceActivity.java

 1 public class CustomServiceActivity extends Activity {
 2     private static  final String TAG="CustomServiceActivity";
 3 
 4     ICustomServices mCustomServices;
 5     @Override
 6     protected void onCreate(Bundle savedInstanceState) {
 7         super.onCreate(savedInstanceState);
 8         setContentView(R.layout.activity_custom_service);
 9 
10         Intent intentCust = new Intent();
11         intentCust.setAction("com.rs.CustomService");
12         //在5.0及以上版本必須要加上這個
13         intentCust.setPackage("com.rs.customservices");
14         bindService(intentCust, mServiceConnection, Context.BIND_AUTO_CREATE);
15     }
16 
17     ServiceConnection mServiceConnection = new ServiceConnection() {
18         @Override
19         public void onServiceConnected(ComponentName componentName, IBinder iBinder) {
20             mCustomServices = ICustomServices.Stub.asInterface(iBinder);
21 
22             Log.i(TAG,"mServiceConnection2 onServiceConnected");
23 
24 
25             try {
26                 mCustomServices.setDate(1999, 5,6);
27                 mCustomServices.setTime(5,45);
28             } catch (RemoteException e) {
29                 e.printStackTrace();
30             }
31 
32         }
33 
34         @Override
35         public void onServiceDisconnected(ComponentName componentName) {
36 
37         }
38     };
39 
40 
41     @Override
42     protected void onDestroy() {
43         super.onDestroy();
44         unbindService(mServiceConnection);
45     }
46 }