device/rockchip/rk312x/system.prop
ro.adb.secure =1
frameworks/base/packages/SystemUI/src/com/android/systemui/usb/UsbDebuggingActivity.java
public void onCreate(Bundle icicle)
-- //setupAlert();
++ try {
++ IBinder b = ServiceManager.getService(USB_SERVICE);
++ IUsbManager service = IUsbManager.Stub.asInterface(b);
++ service.allowUsbDebugging(true, mKey);
++ } catch (Exception e) {
++ Log.e(TAG, "Unable to notify Usb service", e);
++ }
++ finish();