问:
Where's my mounted stuff?
I have a luks encrypted file in stock Android 4.4.4 that I want to mount to work with. It is located in the internal sd partition (/sdcard). I am able to mount it as root via su without problems.

However, other apps an users see the folder as empty. They can even write and remove files of the folder, so no permission problem. But they cannot see what root sees, nor root sees what the normal users do in the folder.

I tried mounting the encrypted file inside /storage, inside /storage/extSdCard and inside the /sdcard itself, always with the same result.

I'm not sure which data to provide, please ask.

Thanks!

OwnerDisplayName: Luis A. Florit

Title: Where's my mounted stuff?


问:
My OS update keeps failing, why?
If I go to System Updates in the Settings menu it will start downloading the latest software update. However it invariably fails, and when it does it just says it was unable to download the update but doesn't say why. I've got over 2gb of free space on my phone but I wonder if maybe that's not enough?!
How can I find out why the update won't download? I don't want to just start deleting stuff and making room if storage isn't the issue.

ContentLicense: CC BY-SA 3.0

Title: My OS update keeps failing, why?


问:
"Please select a keyboard layout" notification on wake?
I have an RCA brand tablet that came with its own physical keyboard.  Whenever I connect this keyboard or turn on the screen while the keyboard is connected, I get this notification:

If I click on the notification, I am brought here:

So, the notification doesn't take me anywhere where I can select a keyboard layout.  I've tried to go into the individual settings for each keyboard and found an option to select a layout, but if I click on that option, it sends me right back to Screenshot 2.  Therefore I can't select a keyboard layout and I can't get rid of the notification.  It is incredibly frustrating to have to keep clearing out the same notification over and over.  How can I stop the notification?

Note that it does the same thing if I am using the AOSP keyboard instead of the SwiftKey keyboard.  I am running android 4.4.2.


问:
What is Qualcomm Settings (hidden) menu on Moto E?
I found a hidden setting menu called Qualcomm Settings on Moto E. How to access the menu (from IB Times):

Download and install a third-party launcher like Nova Launcher from the Play Store.

Once installed, users can access Nova's menu by pressing longer on the homescreen. It will show a pop-up menu with options like Nova Actions, Apps, Shortcuts, Widgets and Wallpapers. Hit Shortcuts to access the sub-menu and select Activities from list of options that appear.

On Activities menu, users are required to scroll down until com.qualcomm.qualcommsettings. Tap on it to access the hidden Qualcomm Settings menu.

Android Pit warns the readers to refrain from accessing those settings that they are unaware of.

Below is the image of the hidden setting menu.

Can anyone tell me what these setting mean?


问:
How to transmit audio wirlessly from a non bluetooth device to a bluetooth phone?
I want to transmit audio from a device having an earphone jack to an android phone wirelessly. How to accomplish it over Bluetooth.

I looked at ED05 Bluetooth board and A2DP, H2DP profiles but could only make out that audio can be transmitted from a phone to these devices.


问:
Android Security Automatically lock
I'm using a Moto X (2nd Gen.) with Android 5.0 and I'm trying to utilize Smart Lock by setting the option in Settings → Security → Automatically lock to:

5 seconds after sleep, except when kept unlocked by Smart Lock

No matter what I change it to, Android will still force me to enter my pattern, except when unlocked by Smart Lock (Trusted devices, Trusted places).

What am I doing wrong?

Title: Android Security Automatically lock


问:
Can't install non-Play store apps
On both my nexus 9 and my Oneplus One running android 5.0.1 the apk installer will pop up and show the permissions but it simply won't let me click install. It does it for apks from the internet and from the Amazon app store. The only thing that I have found is that lollipop doesn't let secondary users install apps but I don't even have secondary users on either of my devices. I searched the settings and haven't found anything, and before you assume that I am a complete fool the "unknown sources" box is checked. How can I fix this?</p>

Title: Can't install non-Play store apps


问:
Battery down over night?
I only found a question where the cause of this problem was the exchange service.
But in my case the battery went down from 80 to 9% over night, with 55% consumed by Android OS.
What are the services that run under that name that could cause 3:30h of CPU time?

Title: Battery down over night?


问:
How do I force Google Now to show updates from certain websites?
Google Now gives me updates for blogs that I visit regularly. But it's not very predictable in which websites it monitors. I see cards for SMBC and Channelate regularly, but not for xkcd. How can I teach it to notify me for xkcd too?</p>


问:
Exchange mobile sync has been disabled using gmail
My Exchange mobile sync has been disabled twice already by the exchange server. The reason is that the corporate policy is to disable mobile sync when a connection is attempted from a different device id. I checked and the reason is that for some reason at certain times Android sends Device ID: 0 instead of the real one.

I am using Lollipop, latest exchange services (Nov 2014) and Gmail as a client.


问:
my phone doesn't load any picture i take with the camera
I thought there was some sort of problem with my camera but it works just fine except that it doesn't load the pictures i take with it. I take a picture and when i try to view it it turns out to be a black screen. And in the gallery it sometimes doesn't show at all. I also can't send them because it says "error loading media". And none of my photos in the gallery have a thumbnail. What can i do?
P.S. I have the 9gag app and it doesn't load any picture on it either; as in i can't view any post whatsoever. Also with instagram.</p>


问:
Should I install higher CWM on old device?
I am updating my Galaxy S3 Mini with Android 5. Here is my steps:

Copy the Lollipop firmware and Google apps package downloaded in the page above into phone (not sd card).

Because I meet the fail to verify whole-file signature error, I need to install ClockworkMod Recovery. I used Odin 3.10. The name of the recovery file is recovery-clockwork-touch-6.0.2.7-golden.tar.md5. I downloaded it from the #4 comment in this page. However when I checked back, it gave me 404 error :-/

Everything seems to be ok, the Lollipop was installed successfully. Nevertheless when I installed Google apps, I got the set_metadata_recursive: some changes failed error. The best answer suggested me to install a higher version of CWM, however when I go to the ROM Manager page of ClowkworkMod website, I see that the highest version of CWM for my device is 6.0.2.7, the version that I'm using.

So should I use the higher version of CWM, even though it's not build for my device?

After Matthew Read suggests me to recover, I repeat step 2. This time, I can't access the recovery mode. The phone screen keeps being black and after a while it restarts to normal mode.


问:
Does Android lock my external SD card in a special way so that it is read-only on a PC?
I just got a new 64GB micro SDXC card for my Samsung Galaxy S2.

I had the same one already before, but after 3 years it said goodbye and had to be replaced (I can still read all data, but writing is impossible).

I am now trying to copy all data from the old SD card to the new one and here's the problem:

Writing to the new card while it is in the phone through Android is no problem at all. As soon as I use an adapter and put it into my PC (tried both, Win 7 and Linux), it is read-only. And I tried two adapters with the lock switch in all possible positions. Still read-only.

I noticed that Android (4.1.2, rooted) formatted the SD card as exFat, but my old card was Fat32. I downloaded AParted and reformatted the card to Fat32, but no changes.

I tried unmounting it properly before shutting down the phone and inserting the card into my PC. Doesn't help, either.

I inserted the card into the phone, connected the phone to my PC. Then I could add data onto the SD card, but the folder ".android_secure" which seems to be necessary for apps to work that have been moved onto an SD card fails to copy because Android doesn't allow that. That was close, but in the end useless because .android_secure could not be copied - and I have a lot of apps on SD.

Any hint on how I could get the last method work (maybe there is a special startup mode for the phone which allows me to access the SD card from my PC without locking ".android_secure"?) or something else? I mean I really have to be able to use the SD card on my PC! I'd appreciate that a lot.


问:
Backup from recovery
After trying to install an OTA update, I'm stuck in recovery mode (system won't boot).

I'd like to know if I got any way to backup my datas (Contacts / SMSs / Enventually applications) from recovery like I would do with Titanium Backup and/or equivalent.

I'm using TWRP recovery, just in case.

Title: Backup from recovery


问:
Additional external wifi and bluetooth adapters through OTG
guys.
I would like to connect additional wifi and bluetooth to my android tablet to make built in free. For example by external wifi I would like to connect wifi keyboard and native one have free for internet.
Is that possible? If yes, how to do this? </p>


问:
Galaxy Note Not Working with Apple Router
I have a new Galaxy Note 10.1 (2014) tablet that I absolutely love. I've been using it to take lecture notes and the thing is great.

The tablet's wifi works fine with every network...except the one I have at home. I have an Apple Airport Express that I use as a hub for my university's 100mbps Ethernet line; I've contacted Samsung support only to get the standard "talk to your ISP about DNS settings" canned response.

The weird thing is, the tablet says it's connected to my network, and my computer says that the tablet is connected as well...but no application that involves internet works...only on my home network.

I've run across a number of forum posts addressing this issue, but few dealing specifically with the Apple hardware and DNS settings. Any and all help would be greatly appreciated.


问:
Wifi symbol always show exclamation mark since Lollipop upgrade
Since getting the recent Lollipop upgrade, the wifi symbol always has an exclamation mark. Wifi seems to work fine, and I gather this symbol means something to do with inability to access Google services - but I use Google Inbox, and that works fine, too. I also understand that this symbol corresponds to the red-shaded wifi symbol of Kit-Kat, but I didn't have that persistently.

So what's going on? It's just slightly annoying.

Motorola Moto G, early 2014.


问:
Possible to export layout of applications on the home screens and import it into another phone?
I would like to know whether it is possible to export layout of applications on the home screens and import it into another phone.

Thanks.


问:
See per-app cache-misses?
This is what I mean by cache miss:

If the processor finds that the memory location is in the cache, a cache hit has occurred. However, if the processor does not find the memory location in the cache, a cache miss has occurred.

I want to see why my apps take 5-6 seconds to switch to after my phone has been idle with its screen locked, and no WiFi or mobile data. Some program running in the background must have generated a ton of cache misses and filled up the entire L2 cache with its own data.

Is there a way to see, per-app, how many cache misses are being generated?

Title: See per-app cache-misses?


问:
SMS Forwarding in Android
I use a dual SIM Android phone.

Model: Micromax canvas 4 Android OS version :4.2

In this device, I have 2 SIM Cards, from two different carriers/operators.
The issue is one of the SIM is flawed and looses connectivity often, sometimes when I am expected to receive SMS, at that very moment, I lose connectivity.

Hence, I want to forward this SMS to another SIM in same phone!

I already use Call forwarding on this device and it works perfectly fine, meaning if my SIM-1 looses connectivity, and someone calls on it, I still get the call on SIM-2, via call forwarding.

Is this possible with SMS?

Title: SMS Forwarding in Android


问:
fastboot oem unlock: hangs with `...'
First of all, I am a newbie to Android. I am using Ubuntu Gnome 14.10 to run all the commads.

I am trying to unlock the bootloader of my Lenovo A536 (stock Android 4.4.2 aka KitKat). Here is what I am trying to do:

$ adb devices              # lists the devices, apparently working
 List of devices attached
 0123456789ABCDEF   device

$ adb reboot bootloader    # no terminal output; phone enters fastboot
                              (there is written '=> FASTBOOT mode...' in the
                              bottom-left corner

$ fastboot oem unlock      # and here it stops without exiting; I have to force quit
 ...                          the fastboot by holding the phone power button for over
                              10s and then the command in terminal ends'

Before doing this I checked the USB debugging in the Developer’s menu.

Update #1

lsusb output (part of it) while the phone is connected to pc and booted in fastboot:

$ lsusb
Bus 002 Device 064: ID 0bb4:0c01 HTC (High Tech Computer Corp.) Dream / ADP1 / G1 / Magic / Tattoo

Update #2
I found out that after installing a USB VCOM Driver on a Windows machine I was able to flash TWRP 2.7.1. I think Linux somehow does not recognise my phone.

Here is the link with tutorial to flash TWRP 2.7.1 using Windows. Note that before running SP Flash Tool, you must connect phone without battery to the computer, and after selecting the scatter file, you must insert battery into phone, otherwise SP Flash Tool would not flash anything.

Title: fastboot oem unlock: hangs with `...'


问:
List of intents and registered apps for those intents?
Is it possible to view a list of intents and which application is set to launch when such intent is issued by an application? It would be nice if the OS provided such a feature where you could also change this as desired or even clear this setting for any intent so that the user would have to choose from a list of apps to open the intent with when the intent is issued. It would also be nice if on such screen one could make exceptions for apps which would open a different application than the default one for a given intent (and this could thus be set on an app-by-app basis).</p>


问:
How do I move screens in the app drawer?
I have a Samsung Galaxy S5.  I have a bunch of apps installed.  From the home screen, I can tap on the Apps icon.  This takes me to the App Drawer.  In the App Drawer, I have 2 screens full of icons of apps.  I have a 3rd screen full of folders with icons of apps in them.  I would like to move the 3rd screen so that it becomes the first screen.  How do I do this?

If I were on the Home Screen, I can long press to allow editing the screens.  Here I can long press on a screen and move it to the left or right of other screens and reposition them.

This doesn't work in the App Drawer.  I can't seem to do this in the App Drawer.  I tap on the menu and tap on Edit.  I am not able to reposition the screens.


问:
Why does my unplugged Nexus 5 keep shutting down after any app usage?
I bought a Nexus 5 a year ago and it has been running fine. After the Lollipop update, my phone has started crashing. Even though the phone has enough battery, if I run any app for like 5 minutes (it happens for any app, no particular app I could isolate), the phone just crashes to a black screen. When I start it again, the battery has suddenly gone to zero from its initial healthy number (e.g. 40%) and the phone shuts down again (sometimes even at the loading stage after the "Google" display on starting). But if I charge my phone even for a second after it crashes and then restart it, then the battery shows up as 40% (or whatever it was pre-crash) again. But then the phone crashes again after I use it. If I don't run any apps, then the phone does not crash.

Does anyone know the solution to this problem? Please help because now I can't use my phone even for 5 minutes without giving it a charger jumpstart!

Note: The phone never crashes when it is plugged to a charger no matter how many apps I use. It only crashes if it's unplugged.


问:
Pasting an image on Word app failed, copying its link instead
I am unable to copy an image from internet and paste it on Word documents. When I copy the image, the image's link is copied to clipboard and when I paste it on Word document the link is pasted.

Can anyone tell me why am I unable to copy image to clipboard and how can I do so?

I'm using Motorola Moto E on Android KitKat 4.4.4 if it matters.


问:
Allow access to files and apps to users in android L
I have a Nexus 5, rooted with custom kernel ElementalX. I want to allow a normal user to have access to all my pictures and songs. How to grant access to the user?</p>


问:
My Navigation Keys and Status Bar are lost!
I'm using Nexus 5, Lollipop 5.0.1 (rooted), no custom ROM, and Franco Kernel. I was changing my Nav Keys by an app. By mistake, I hit restore and then after the reboot I found that my nav bars are gone and even the status bar!

Now I literally have to reboot to switch in apps. Please help!


问:
"Damaged SD card" error on internal storage
I have a Samsung Galaxy S2 Skyrocket and after rebooting my phone yesterday, it's now giving me a "Damaged SD card" on /storage/sdcard0. Here's the thing... I've never had an SD card, and there's no SD card in the phone. Yet all my data (pictures etc) and my camera are not working, saying there's no storage device available.

Any thoughts? How do I mark this as clean? I tried to "cd" into it on the terminal and got permission denied.

The device is rooted.


问:
How do I log out from Google Apps without logging out from Android Device Manager?
Say my phone was stolen, and I need to log out from my Google Apps in that phone remotely. I can revoke the access in that phone through my web browser, however I would log out from Android Device Manager too and I won't be able to track it.

The only thing I guess it could work is to change Google's password, however I don't know if I will be logged out from Android Device Manager on that phone.


问:
How can I remove the screen lock during phone calls on Android 4.4.4?
How can I remove the screen lock during phone calls on Android 4.4.4? I have a Samsung Galaxy Core 2, and whenever I'm on a call I have to tap the screen two times to unlock it. Is it possible to remove it?</p>


问:
Recovering data remotely from a lost device
I was wondering if I could recover some photos and/or contacts from my phone which I lost yesterday.

Also I'm pretty sure it was stolen, so is there a way that I can know when the device is online?


问:
Mute/Unmute call from notification bar
I be on meeting calls for long hours.  I usually mute/unmute call by pressing home and then use call app to mute.

I want some app which can provide me functionality to mute /unmute using notification bar.

I have tried many app but none is providing this functionality.

Handset: Micromax Canvas Nitro A310

**OS: Android 4.4 Kitkat **

Title: Mute/Unmute call from notification bar


问:
How can I tether my phone's Wi-Fi connection to a PC over USB?
Today in my work the people from security are going to block internet access and only admit enterprise local pages. Luckily, there is a free Wi-Fi connection which I have access from my Motorola Milestone. Is there any way for me to tether the Wi-Fi connection over USB to my computer?</p>