Now, I am working on data transmission using bluetooth. I have such problem in selecting file in SD card/ internal storage.
I am already put permission in manifest :
I am using this command to get access the file
File sdCard = Environment.getExternalStorageDirectory();
But when I am check using this command if (sdCard.canRead()) , it can't read the path.
Anyone have the solution within my problem? Thanks anyway
The Android Dev resources has a good guide on this.
Assuming you have all the correct permissions, you could be facing issues where the storage is not mounted or there is not enough space. The guide explains how to check the state of the External Storage Dir, etc.
Did you add the following line to the AndroidManifest?
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
From android SDK version 4, you need to add that line to access external storage by your app.
Some of other issues are, (Check whether phone detects the SD card)
SD Card is Not Clean
Battery Voltage
Card Slot is Squeezed
Metal Wires in the Card Slot Get Rusty and Twisted
Malware Invade SD Card
SD Card is not Formatted Properly
SD Card is Broken
The Phone Breakdown
problem solved.
The problem is related with new android SDK. We need to add additional permission.
Thanks everyone.
Related
I need some help with granting write permissions to external sd card on an Android TV box (Xiaomi Mi Box).
I plugged a micro SD card using a USB adapter and I can access the files and read them without any problem. I can even write to an app specific folder located at Android\data\app package name.
However, When I try to write files to the root directory of the sd card I'm asked to Grant permission to the app. On a normal Android phone a different app bulit in inside of Android will be opened, where there I will select the sd card and then and give the app a permissions for writing to it. However, this app doesn't exists on the Mi Box.
I side loaded the app to the streamer (it's called my files),and it was installed successfully, but it didn't show me the sd card I plugged in what so ever, so I couldn't give the app a write permissions.
So my question is: is there an alternative way to grant an app a write permissions to an extenal SD card? Maybe through adb?
If someone knows about any solution it would be really helpful.
If your solution doesn't involve rooting it would be wonderful.
Thank you and have a great day!
I have an Android application that generates some data (simple text file) that I would like to transfer to my PC for further processing. My understanding is that my storage options for a place to save such a file are a) internal storage or b) external storage. My device is a rooted Nexus 7 running Marshmallow, and I can't get either option to work.
With internal storage I'm able to write the file but then it's nowhere to be found using ADB or Eclipse DDMS. With external storage I'm getting FileNotFoundExceptions which I'm guessing are due to new complicated permissions, so none of Android saving file to external storage is working.
Is this possible and, if so, is there an easy way to do it?
What is your targetSdkVersion? If you target 22 and below, the new permission policy won't take effect.
It is possible to write a text file in Android and read the same in your PC using external-storage.
This app does the same.
You can find a simple example here.
If this does not work for you, kindly share your code-snippet that writes the file.
mySound.load(new URLRequest("file://mnt/sdcard/AnyFolder/YourSound.mp3"));`<br/>
I want to detect the name of the sdcard at runtime, so i can store my app-data on external storage.
The above codeline is an example of storing a mp3 to user's required location.
Maybe you are asking for:
File f = new File(Environment.getExternalStorageDirectory() +
"/" + "yourfilename");
I also recomend you to avoid writing to the root of the SD card. It is a good practice to write your aplication data into the appropriate folder:
File f = new File(Environment.getExternalStorageDirectory() +
"/Android/data/com.example.testapp/" + "yourfilename");
Obviously, you have to change the "com.example.testapp" with your app package (the package you entered when you created the project in Eclipse/Android Studio).
getExternalStorageDirectory()
in
http://developer.android.com/reference/android/os/Environment.html
use Environment.getExternalStorageState() it will give path to internal SD mount point like "/mnt/sdcard"
First, on Android 4.4+, you do not have write access to removable media (e.g., "external SD"), except for any locations on that media that might be returned by
getExternalFilesDirs() and getExternalCacheDirs().
See Dave Smith's excellent analysis of this, particularly if you want the low-level details.
Second, lest anyone quibble on whether or not removable media access is otherwise part of the Android SDK, here is Dianne Hackborn's assessment:
...keep in mind: until Android 4.4, the official Android platform has not supported SD cards at all except for two special cases: the old school storage layout where external storage is an SD card (which is still supported by the platform today), and a small feature added to Android 3.0 where it would scan additional SD cards and add them to the media provider and give apps read-only access to their files (which is also still supported in the platform today).
Android 4.4 is the first release of the platform that has actually
allowed applications to use SD cards for storage. Any access to them
prior to that was through private, unsupported APIs. We now have a
quite rich API in the platform that allows applications to make use of
SD cards in a supported way, in better ways than they have been able
to before: they can make free use of their app-specific storage area
without requiring any permissions in the app, and can access any other
files on the SD card as long as they go through the file picker, again
without needing any special permissions.
My app can write and delete file from the android sd card by adding the
android.permission.WRITE_EXTERNAL_STORAGE permission.
But this does not work with the external SD card some devices support. Writing to the default SD card (/mnt/sdcard0 in most cases) has no problem, but this does not work with the extra sd cards (/mnt/sdcard1 ).
I have googled about this and also gone through some threads in stackoverfolw itself, but still i am not able to find a proper solution.
Is it really a bug in android? Is there any workaround for this?
I will really appreciate any clarification on this.
You can get the path of sdcard from this code:
String path = Environment.getExternalStorageDirectory().getAbsolutePath();
Then specify the foldername and file name.
if you are using an emulator, double-check to make sure that you have filled in a value for the SD Card size.
I would like to get in my file browser File reference to external disk not SD Card. I mean I know that there is method
Environment.getExternalStorageDirectory();
But to my knowledge this will get reference to SD Card. But how to get external disk (say kind of USB storage attached to Android device)? You know that device can have both SD card and external USB stick attached to them.
But how to get external disk (say kind of USB storage attached to Android device)?
Android does not support this. If particular devices do, you would have to ask their manufacturers what they recommend.
In the end I have selected following solution:
1) Enlisting all existing roots using:
File[] roots=File.listRoots();
2) check presense among those roots standard ones, i.e.
File phoneRoot=new File("//");
File sdRoot=Environment.getExternalStorageDirectory();
3) If there are some extra ones - treat them as those additional external disks/sticks
I think it's best solution, since no hacks, everything is standard and this covers possible future extensions.