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也有一些隱藏著的命令, 通常它是被系統調用,但是由於使用權限設定的原因, 普通的進程也能通過命令列去使用它們.
比如,我之前提到的<Android效能測試工具之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發送一些資訊
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.

當前啟動並執行service：

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

下面再來一個用來發簡訊的

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,
這兩個檔案都是給OEM廠商整合用的, 代碼我這裡就不貼了,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, 以後要想在後台發簡訊,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直接互動:)

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