設置T卡

./frameworks/base/core/res/res/xml/storage_list.xml

 <StorageList xmlns:android="http://schemas.android.com/apk/res/android">
    <!-- removable is not set in nosdcard product -->
    <storage android:mountPoint="/mnt/sdcard"
      android:storageDescription="@string/storage_phone"
 android:allowMassStorage="true"
      android:primary="true" />
      
    <storage android:mountPoint="/mnt/sdcard2"
      android:storageDescription="@string/storage_sd_card"
      android:removable="true"
 android:allowMassStorage="true"
      android:primary="false" />
</StorageList>