Android默认打开USB adb调试

/*******************************************************************
* I.MX6 默认打开 USB adb
* 声明：
* 在调试android的时候，尤其是前期，可能我们没有Touch，这样使用adb显得
* 力不从心，因为它会弹个对话框来，可你有按不了，于是默认打开adb就成了需求。
*
******************************************************************/

一、参考文章：
飞思卡尔 imx6 android 调试环境搭建
http://www.wjxfpf.com/2015/10/590190.html
Android 4.2.2 开机默认开启USB调试
http://blog.csdn.net/zhujm320/article/details/37914487
默认打开USB调试功能
http://blog.csdn.net/pfgmylove/article/details/16985159

二、解决方案：
1. cat frameworks/base/services/java/com/android/server/usb/UsbDeviceManager.java

        ......        public void systemReady() {            if (DEBUG) Slog.d(TAG, "systemReady");            mNotificationManager = (NotificationManager)                mContext.getSystemService(Context.NOTIFICATION_SERVICE);            // We do not show the USB notification if the primary volume supports mass storage.            // The legacy mass storage UI will be used instead.            boolean massStorageSupported = false;            final StorageManager storageManager = StorageManager.from(mContext);            final StorageVolume primary = storageManager.getPrimaryVolume();            massStorageSupported = primary != null && primary.allowMassStorage();            mUseUsbNotification = !massStorageSupported;            // make sure the ADB_ENABLED setting value matches the current state            //Settings.Global.putInt(mContentResolver, Settings.Global.ADB_ENABLED, mAdbEnabled ? 1 : 0);            Settings.Global.putInt(mContentResolver, Settings.Global.ADB_ENABLED, 1);             mHandler.sendEmptyMessage(MSG_SYSTEM_READY);        }        ......

2.cat /init.rc

        ......        #  Enable adb security for JB4.2.2            setprop ro.adb.secure 0        ......

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