[Android-Frameworks] My commit on USB Mass Storage

My Commit on USB Mass Storage

【修改】

mMountService  .setExternalUsbMassStorageEnabled ( true );     @MountService.java

     

     ->  enableExternalUsbMassStorage()     @StorageManager.java

               ->  onStorageStateChanged()      @UsbStorageActivity.java, CALLBACK 

                         -> Condition,condition,condition,condition

1. UsbSettings上的Mass Storage选项怎样添加上去?     

     【观察】

     【结果】

     在UsbDeviceManager.java代码中 updateUsbNotification部分，通过读取volume allowMassStorage配置信息，决定了是否显示USB Notification。

     

     "Touch for other USB options"@Notification     ->      "PTP, MTP" @PreferenceFragment         

     一旦用户点击了Notification,会跳转到UsbSettings preference fragment界面。现在的问题是UMS

是怎样添加到UsbSettings Fragment中的呢？

      【修改】     配置storage 属性

          FILE:     vendor/intel/mfld_pr2/overlays/frameworks/base/core/res/res/xml/storage_list.xml

          LINE:          +39       android:allowMassStorage  = "true"

                            +45      android:allowMassStorage  = "true"

     2.  步骤规划

          

          step1: 实现mass storage

          step2: 实现external sd mass storage feature

     【修改】    vold.fstab 让vold挂载到mmc

           FILE:     vendor/intel/mfld_pr2/vold.fstab

          LINE:     

   #dev_mount sdcard_ext / mnt /sdcard_ext auto /devices/pci0000:00/0000:00:04.0/mmc_host/mmc1   

 #/devices/pci0000:00/0000:00:02.3/gadget/lun0

# build-in memory

dev_mount  sdcard  / mnt / sdcard 7  /devices/pci0000:00/0000:00:01.0/mmc_host/mmc0    /devices/pci0000:00/0000:00:02.3/gadget/lun0

# external sdcard memory

dev_mount sdcard_ext / mnt /sdcard_ext auto  /devices/pci0000:00/0000:00:04.0/mmc_host/mmc1  /devices/pci0000:00/0000:00:02.3/gadget/lun1

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-

     FILE:     UsbManager.java

     *  <li>  {@link #USB_FUNCTION_MASS_STORAGE }  boolean extra indicating whether the

     * mass storage function is enabled

     FILE:     IMountService.java

     *

        /**

             * Enables / disables USB mass storage. The caller should check

             * actual status of enabling/disabling USB mass storage via

             * StorageEventListener.

             */

             public  void  setUsbMassStorageEnabled( boolean  enable)  throws  RemoteException

     *

     FILE:     MountServiceListener.java

     *

        /**

     * USB Mass storage connection state has changed.

     *

     *  @param  connected True if UMS is connected.

     */

     void  onUsbMassStorageConnectionChanged ( boolean  connected) {

     *

     <search>  onUsbMassStorageConnectionChanged  

      FILE:     DatabaseHelper.java

     *

         loadBooleanSetting(stmt, Settings.Secure.  USB_MASS_STORAGE_ENABLED  ,

                    R.bool.def_usb_mass _storage_enabled);

     *

     FILE:     frameworks/base/packages/SettingsProvider/res/values/defaults.xml

     *

           < bool  name =  "def_usb_mass_storage_enabled" > true  </ bool >

     *

     

-

          01-01 00:22:57.469: E/UsbSettings(527): UsbAccessoryMode false