使用AIDL调用远程服务设置系统时间

在实际工作中，经常遇到客户需要用代码设置系统时间的需求，但是Android非系统应用是无法设置系统时间的。于是，我设计了一个使用系统签名的时间设置服务，客户通过bind调用服务里的方法就能达到设置时间的目的。

这里用到的技术有：

1、Signapk签名

2、AIDL

3、bind service

将应用变成系统应用

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

2、使用系统密钥签名。系统签名在Android源码目录中的位置是"build\target\product\security"，下面的platform.pk8和platform.x509.pem两个文件。然后用Android提供的Signapk工具来签名，signapk的源代码是在"build\tools\signapk"下，用法为"signapk platform.x509.pem platform.pk8 input.apk output.apk"

时间设置服务 CustomServices

ICustomServices.aidl 里定义了设置日期和设置时间方法

 interface ICustomServices {

      void setDate(int year,int month,int day);
      void setTime(int hourOfDay, int minute);

 }

CustomService.Java   

 public class CustomService extends Service {
     private static final String TAG = CustomService.class.getSimpleName();

     private MyBinder mBinder;

     @Override
     public void onCreate() {
         super.onCreate();

         if (mBinder == null) {
             mBinder = new MyBinder();
         }

     }

     @Override
     public IBinder onBind(Intent intent) {
         return mBinder;
     }

     class MyBinder extends ICustomServices.Stub {

         @Override
         public void setDate(int year, int month, int day) throws RemoteException {

             setDate(CustomService.this, year, month - 1, day);
         }

         @Override
         public void setTime(int hourOfDay, int minute) throws RemoteException {
             setTime(CustomService.this, hourOfDay, minute);
         }

         void setDate(Context context, int year, int month, int day) {
             Calendar c = Calendar.getInstance();

             c.set(Calendar.YEAR, year);
             c.set(Calendar.MONTH, month);
             c.set(Calendar.DAY_OF_MONTH, day);
             long when = c.getTimeInMillis();

             if (when / 1000 < Integer.MAX_VALUE) {
                 ((AlarmManager) context.getSystemService(Context.ALARM_SERVICE)).setTime(when);
             }
         }

         void setTime(Context context, int hourOfDay, int minute) {
             Calendar c = Calendar.getInstance();

             c.set(Calendar.HOUR_OF_DAY, hourOfDay);
             c.set(Calendar.MINUTE, minute);
             c.set(Calendar.SECOND, 0);
             c.set(Calendar.MILLISECOND, 0);
             long when = c.getTimeInMillis();

             if (when / 1000 < Integer.MAX_VALUE) {
                 ((AlarmManager) context.getSystemService(Context.ALARM_SERVICE)).setTime(when);
             }
         }
     }

 }

AndroidManifest.xml

 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.rs.customservices" android:sharedUserId="android.uid.system">
     <application
         android:allowBackup="true"
         android:icon="@mipmap/ic_launcher"
         android:label="@string/app_name"
         android:supportsRtl="true"
         android:theme="@style/AppTheme">

         <service
             android:name="com.rs.customservices.CustomService"
             android:enabled="true"
             android:exported="true">
             <intent-filter>
                 <action android:name="com.rs.CustomService" />
             </intent-filter>
         </service>
     </application>

 </manifest>

编译完后使用系统签名将APK文件签名成系统应用。

 客户程序

将上面工程中的 ICustomServices.aidl 拷入到客户工程中，注意：包的目录结构也需要拷入。

CustomServiceActivity.java

 public class CustomServiceActivity extends Activity {
     private static  final String TAG="CustomServiceActivity";

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

         Intent intentCust = new Intent();
         intentCust.setAction("com.rs.CustomService");
         //在5.0及以上版本必须要加上这个
         intentCust.setPackage("com.rs.customservices");
         bindService(intentCust, mServiceConnection, Context.BIND_AUTO_CREATE);
     }

     ServiceConnection mServiceConnection = new ServiceConnection() {
         @Override
         public void onServiceConnected(ComponentName componentName, IBinder iBinder) {
             mCustomServices = ICustomServices.Stub.asInterface(iBinder);

             Log.i(TAG,"mServiceConnection2 onServiceConnected");

             try {
                 mCustomServices.setDate(1999, 5,6);
                 mCustomServices.setTime(5,45);
             } catch (RemoteException e) {
                 e.printStackTrace();
             }

         }

         @Override
         public void onServiceDisconnected(ComponentName componentName) {

         }
     };

     @Override
     protected void onDestroy() {
         super.onDestroy();
         unbindService(mServiceConnection);
     }
 }