状态栏不弹出“已连接USB”的解决办法

我们将Android5.1设备与PC（计算机/电脑）连接时，USB计算机连接方式有：USB 存储设备、媒体设备（MTP）、相机（PTP）、只充电。比如，我要使用 “USB存储设备” 这个USB连接方式：
状态栏不弹出“已连接USB”的解决办法

那么，状态栏会弹出，“已连接USB” 的通知，并且你可以点击进去，打开USB存储设备：
状态栏不弹出“已连接USB”的解决办法

将Android设备与PC连接设置为 “USB存储设备” 模式，就是将Android设备的内部存储器挂载到PC，当做U盘使用。

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现在在我们的工业平板上遇到状态栏不弹出“已连接USB”，那么就不能打开USB存储设备：
状态栏不弹出“已连接USB”的解决办法

虽然，不使用“USB存储设备” 模式作为Android设备与PC连接方式，“媒体设备（MTP）”模式也可以在Android与PC之间进行数据传输；但是，有时候应用程序需要使用“USB存储设备”这个模式，APP新建的文件/文件夹可以实时更新到PC，其他模式却不行。因此，需要“USB存储设备” 模式能够正常使用！

排查问题过程：
1. 查找关键字
通过查找关键字“已连接USB”，追踪到frameworks/base/packages/SystemUI/src/com/android/systemui/usb/StorageNotification.java文件。在updateUsbMassStorageNotification方法中，通过打印日志发现 available 和 isStorageCanShared 值为false，导致“已连接USB”通知弹不出来！
2. 文件对比
available 和 isStorageCanShared 值与 volumes.getPath() 和 mStorageManager.getVolumeState(path); 相关，通过对比能够正常使用“USB存储设备”的StorageNotification.java文件，StorageNotification.java没有异常。

/**
* Update the state of the USB mass storage notification
*/
void updateUsbMassStorageNotification(boolean available) {
boolean isStorageCanShared = isAbleToShare();
Slog.d(TAG, "updateUsbMassStorageNotification - isStorageCanShared=" + isStorageCanShared + ",available=" + available);
if( !mStorageManager.isUsbMassStorageEnabled() || mLastState.equals(Environment.MEDIA_BAD_REMOVAL) ) {
/* Show "USB Connected" notification, if the system want it and there is more than one storage can be shared. */
/* Like SHARED SD, there is an internal storage, but that can not be shared. So don't show notification. */
if (available && isStorageCanShared) { // available 与 isStorageCanShared 的值都为false
Slog.d(TAG, "updateUsbMassStorageNotification - [true]");
Intent intent = new Intent();
intent.setClass(mContext, com.android.systemui.usb.UsbStorageActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
PendingIntent pi = PendingIntent.getActivity(mContext, 0, intent, 0);
setUsbStorageNotification(
com.android.internal.R.string.usb_storage_notification_title,
com.android.internal.R.string.usb_storage_notification_message,
com.android.internal.R.drawable.stat_sys_data_usb,
false, true, pi);
} else if(!available && !isStorageCanShared || !mUmsAvailable) {
/* Cancel "USB Connected" notification, if the system want to cancel it and there is no storage can be shared. */
/* Like SD hot-plug, remove the external SD card, but still one storage can be shared. So don't cancel the notification. */
Slog.d(TAG, "updateUsbMassStorageNotification - [false]");
setUsbStorageNotification(0, 0, 0, false, false, null);
} else {
Slog.d(TAG, "updateUsbMassStorageNotification - Cannot as your wish!");
/* When there is no partition to share (NOFS/BAD/...), invisible this notification */
Intent intent = new Intent();
intent.setClass(mContext, com.android.systemui.usb.UsbStorageActivity.class);
PendingIntent pi = PendingIntent.getActivity(mContext, 0, intent, 0);
setUsbStorageNotification(
com.android.internal.R.string.usb_storage_stop_notification_title,
com.android.internal.R.string.usb_storage_stop_notification_message,
com.android.internal.R.drawable.stat_sys_warning, false, false, pi);
}
mLastConnected = available;
} else {
Slog.d(TAG, "updateUsbMassStorageNotification - UMS Enabled");
}
}

private void onUsbMassStorageConnectionChangedAsync(boolean connected) {
mUmsAvailable = connected;
/*
* Even though we may have a UMS host connected, we the SD card
* may not be in a state for export.
*/
int allowedShareNum = 0;
String st = "";
String path = "";
StorageVolume[] volumes = mStorageManager.getVolumeList();
if (volumes != null) {
for (int i = 0; i < volumes.length; i++) {
if (volumes[i].allowMassStorage() && !volumes[i].isEmulated()) {
path = volumes[i].getPath();
st = mStorageManager.getVolumeState(path);
if (!(st.equals(Environment.MEDIA_REMOVED) || st.equals(Environment.MEDIA_CHECKING)|| st.equals(Environment.MEDIA_BAD_REMOVAL))) {
/* got a truly sharable volume */
allowedShareNum++;
}
}
}
}
if(connected && allowedShareNum == 0){
/* only changed connceted here */
Slog.d(TAG, "change connected from true -> false");
connected = false;
}
if (st != null) {
if (DEBUG) Log.i(TAG, String.format("UMS connection changed to %s (media state %s), (path %s)",
connected, st, path));
Slog.d(TAG, "onUsbMassStorageConnectionChangedAsync - mLastState: " + mLastState + ", st: " + st + ", mLastConnected: " + mLastConnected+ ", connected: " + connected + ", path: " + path);
if (!connected) {
mUsbNotifications.clear();
updateUsbMassStorageNotification(connected);
Slog.d(TAG, "onUsbMassStorageConnectionChangedAsync - Disconnect");
} else {
String mCurrentFunctions = SystemProperties.get("sys.usb.config", "none");
if (containsFunction(mCurrentFunctions, UsbManager.USB_FUNCTION_MASS_STORAGE)) {
Slog.d(TAG, "onUsbMassStorageConnectionChangedAsync - Connect - UMS");
if (mLastState.equals(st) && mLastConnected == connected && !mAlarmBootOff) {
Slog.d(TAG, "onUsbMassStorageConnectionChangedAsync - Connect - UMS - Ignore");
return;
}
updateUsbMassStorageNotification(connected);
} else {
Slog.d(TAG, "onUsbMassStorageConnectionChangedAsync - Connect - MTP");
setUsbStorageNotification(0, 0, 0, false, false, null);
mLastConnected = connected;
}
}
}
mLastConnected = connected;
Slog.d(TAG, "onUsbMassStorageConnectionChangedAsync - mLastConnected: " + mLastConnected);
}

3. 检查配置文件
需要检查配置文件是ProjectConfig.mk、<project>_defconfig，通过与正常的配置文件进行对比检查，发现如下异常：
在ProjectConfig.mk文件中：
异常：MTK_MULTI_PARTITION_MOUNT_ONLY_SUPPORT = yes
      MTK_OWNER_SDCARD_ONLY_SUPPORT = yes
      MTK_SHARED_SDCARD = yes
正常：MTK_MULTI_PARTITION_MOUNT_ONLY_SUPPORT = no
      MTK_OWNER_SDCARD_ONLY_SUPPORT = no
      MTK_SHARED_SDCARD = no
在<project>_defconfig文件中：
异常：CONFIG_MTK_SHARED_SDCARD=y
      CONFIG_MTK_MULTI_PARTITION_MOUNT_ONLY_SUPPORT=y
正常：# CONFIG_MTK_SHARED_SDCARD is not set
      # CONFIG_MTK_MULTI_PARTITION_MOUNT_ONLY_SUPPORT is not set

4. 问题处理
将上述ProjectConfig.mk、<project>_defconfig文件中出现的问题进行修改：在ProjectConfig.mk文件中：
      MTK_MULTI_PARTITION_MOUNT_ONLY_SUPPORT = yes  --> MTK_MULTI_PARTITION_MOUNT_ONLY_SUPPORT = no
      MTK_OWNER_SDCARD_ONLY_SUPPORT = yes                --> MTK_OWNER_SDCARD_ONLY_SUPPORT = no
      MTK_SHARED_SDCARD = yes                                           --> MTK_SHARED_SDCARD = no
在<project>_defconfig文件中：
      CONFIG_MTK_SHARED_SDCARD=y                                           -->  # CONFIG_MTK_SHARED_SDCARD is not se
      CONFIG_MTK_MULTI_PARTITION_MOUNT_ONLY_SUPPORT=y --> # CONFIG_MTK_MULTI_PARTITION_MOUNT_ONLY_SUPPORT is not set

修改完成之后make clean，并且全部重新编译Android5.1源码，将编译好的源码，更新到我们的工业平板上，即可解决“USB存储设备” 模式不可用的问题。

状态栏不弹出“已连接USB”的解决办法

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