Android學習之Service命令的妙用

Android系統不光在host上為我們提供了一些好用的命令, 同時device也有一些隱藏着的命令, 通常它是被系統調用,但是由於權限設置的原因, 普通的進程也能通過命令行去使用它們.
比如,我之前提到的<Android性能測試工具之dumpsys>及<Android調試工具之adbs>

在device中, 有一個service命令, 可以看到當前所有的service, 同時也可以使用它來往一些activity發送一些信息
如下所示,  service的用法：

root@android:/ # service                                                       
Usage: service [-h|-?]
       service list
       service check SERVICE
       service call SERVICE CODE [i32 INT | s16 STR] ...
Options:
   i32: Write the integer INT into the send parcel.
   s16: Write the UTF-16 string STR into the send parcel.

當前運行的service：

root@android:/ # service list                                                  
Found 61 services:
0	sip: [android.net.sip.ISipService]
1	phone: [com.android.internal.telephony.ITelephony]
2	iphonesubinfo: [com.android.internal.telephony.IPhoneSubInfo]
3	simphonebook: [com.android.internal.telephony.IIccPhoneBook]
4	isms: [com.android.internal.telephony.ISms]
5	nfc: [android.nfc.INfcAdapter]
6	samplingprofiler: []
7	diskstats: []
8	appwidget: [com.android.internal.appwidget.IAppWidgetService]
9	backup: [android.app.backup.IBackupManager]
10	uimode: [android.app.IUiModeManager]
11	usb: [android.hardware.usb.IUsbManager]
12	audio: [android.media.IAudioService]
13	wallpaper: [android.app.IWallpaperManager]
14	dropbox: [com.android.internal.os.IDropBoxManagerService]
15	search: [android.app.ISearchManager]
16	country_detector: [android.location.ICountryDetector]
17	location: [android.location.ILocationManager]
18	devicestoragemonitor: []
19	notification: [android.app.INotificationManager]
20	mount: [IMountService]
21	throttle: [android.net.IThrottleManager]
22	connectivity: [android.net.IConnectivityManager]
......

使用service的phone來打電話

root@android:/ # service call phone 2 s16 "123"                              
Result: Parcel(00000000    '....')

 此時, 就直接撥號了:), 但是這里注意, 緊急號碼在這里是不work的.

下面再來一個用來發短信的

root@android:/ # service call isms 4 s16 "12345678" s16 "" s16 "hello world!" s16 "" s16 ""

下面就說一下原理
大家先找到代碼frameworks/base/telephony/java/com/android/internal/telephony/ITelephony.aidl和ISms.aidl,
這兩個文件都是給OEM廠商集成用的, 代碼我這里就不貼了,細心的童鞋一眼就能看出來, 上面的"2", "4"就是指定了是哪一個函數
比如, 2 就是

 

    /**
     * Place a call to the specified number.
     * @param number the number to be called.
     */
    void call(String number);

 

 4就是

 

    /**
     * Send an SMS.
     *
     * @param smsc the SMSC to send the message through, or NULL for the
     *  default SMSC
     * @param text the body of the message to send
     * @param sentIntent if not NULL this <code>PendingIntent</code> is
     *  broadcast when the message is sucessfully sent, or failed.
     *  The result code will be <code>Activity.RESULT_OK<code> for success,
     *  or one of these errors:<br>
     *  <code>RESULT_ERROR_GENERIC_FAILURE</code><br>
     *  <code>RESULT_ERROR_RADIO_OFF</code><br>
     *  <code>RESULT_ERROR_NULL_PDU</code><br>
     *  For <code>RESULT_ERROR_GENERIC_FAILURE</code> the sentIntent may include
     *  the extra "errorCode" containing a radio technology specific value,
     *  generally only useful for troubleshooting.<br>
     *  The per-application based SMS control checks sentIntent. If sentIntent
     *  is NULL the caller will be checked against all unknown applications,
     *  which cause smaller number of SMS to be sent in checking period.
     * @param deliveryIntent if not NULL this <code>PendingIntent</code> is
     *  broadcast when the message is delivered to the recipient.  The
     *  raw pdu of the status report is in the extended data ("pdu").
     */
    void sendText(in String destAddr, in String scAddr, in String text,
            in PendingIntent sentIntent, in PendingIntent deliveryIntent);

所以, 以后要想在后台發短信,打電話,可以直接調用Java的Runtime Exec來調用service提供的命令, 這樣就可以部分繞過framework中的一些java service, 而直接跟更底層的c++/C實現的service直接交互:)

 http://blog.csdn.net/melody_lu123/article/details/7401744