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Document restricted app private file permissions

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Make the docs reflect changes in private file access permissions.

Starting with API level 24 app private files are exclusively accessible
to the owning app. Files can no longer be shared by name because apps
cannot relax the files system permissions.

Bug: 27636012
Change-Id: Ibcb5032986c819829fa13ba07a74f20f2997e995
This commit is contained in:
Janis Danisevskis
2016-03-15 12:14:53 +00:00
parent 3c3a59e949
commit c83343f7ee
2 changed files with 20 additions and 1 deletions
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13
docs/html/guide/topics/data/data-storage.jd
View File

@@ -178,6 +178,19 @@ android.content.Context#MODE_APPEND}, {@link
android.content.Context#MODE_WORLD_READABLE}, and {@link
android.content.Context#MODE_WORLD_WRITEABLE}.</p>
<p class="note"><strong>Note:</strong> The constants {@link
android.content.Context#MODE_WORLD_READABLE} and {@link
android.content.Context#MODE_WORLD_WRITEABLE} have been deprecated since API level 17. Since
API level 24 their use will result in a {@link java.lang.SecurityException} to be thrown.
This means that apps targeting API level 24 and higher
cannot share private files by name, and attempts to share a "file://" URI will result in a
{@link android.os.FileUriExposedException} to be thrown. If your app needs to share private
files with other apps, it may use a {@link android.support.v4.content.FileProvider} with
the {@link android.content.Intent.FLAG_GRANT_READ_URI_PERMISSION}.
See also <a
href="{@docRoot}training/secure-file-sharing/index.html">Sharing Files</a>.
</p>
<p>To read a file from internal storage:</p>
<ol>

8
docs/html/training/basics/data-storage/files.jd
View File

@@ -59,7 +59,7 @@ The following lists summarize the facts about each storage space.</p>
<p><b>Internal storage:</b></p>
<ul>
<li>It's always available.</li>
<li>Files saved here are accessible by only your app by default.</li>
<li>Files saved here are accessible by only your app.</li>
<li>When the user uninstalls your app, the system removes all your app's files from
internal storage.</li>
</ul>
@@ -83,6 +83,12 @@ place for files that don't require access restrictions and for files that you wa
with other apps or allow the user to access with a computer.</p>
</div>
<p class="note">
<strong>Note:</strong> Before API level 24, internal files could be made accessible to other
apps by means of relaxing file system permissions. This is no longer the case. If you wish
to make the content of a private file accessible to other apps, your app may use the
{@link android.support.v4.content.FileProvider}. See <a
href="{@docRoot}training/secure-file-sharing/index.html">Sharing Files</a>.</p>
<p class="note" style="clear:both">
<strong>Tip:</strong> Although apps are installed onto the internal storage by