Update string to enable transcode via MTP

Also added a summary string when checked.

Test: Manual
Bug: 191985287
Change-Id: I1db9763bbf3766eecace6eca168218ab71ca6195
diff --git a/res/values/strings.xml b/res/values/strings.xml
index c19c8dc..c855588 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -10592,7 +10592,11 @@
     <!-- Title of one of the choices in a dialog (with title defined in usb_use) that lets the user
          select what the USB connection for this device should be used for. This choice
          is for transcoding the files that are transferred via MTP. -->
-    <string name="usb_transcode_files">Transcode exported media</string>
+    <string name="usb_transcode_files">Convert videos to AVC</string>
+    <!-- The summary text that appears when the user enables the 'Convert videos to AVC' option for
+         transcoding files to compatible formats before transferring them from the device to PC.
+         [CHAR LIMIT=NONE] -->
+    <string name="usb_transcode_files_summary">Videos will play on more media players, but quality may be reduced</string>
     <!-- Description of one of the choices in a dialog (with title defined in usb_use) that lets the user
          select what the USB connection for this device should be used for. This choice
          is for transferring photos via PTP. -->
diff --git a/src/com/android/settings/connecteddevice/usb/UsbDetailsTranscodeMtpController.java b/src/com/android/settings/connecteddevice/usb/UsbDetailsTranscodeMtpController.java
index 7ce8470..bbaaa31 100644
--- a/src/com/android/settings/connecteddevice/usb/UsbDetailsTranscodeMtpController.java
+++ b/src/com/android/settings/connecteddevice/usb/UsbDetailsTranscodeMtpController.java
@@ -55,6 +55,7 @@
         mSwitchPreference = new SwitchPreference(mPreferenceCategory.getContext());
         mSwitchPreference.setTitle(R.string.usb_transcode_files);
         mSwitchPreference.setOnPreferenceClickListener(this);
+        mSwitchPreference.setSummaryOn(R.string.usb_transcode_files_summary);
         mPreferenceCategory.addPreference(mSwitchPreference);
     }