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 argetproductsecurity"，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 oolssignapk"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);
    }
}