android - How to access Storage from SD card connected via OTG -


i try read , change textfile on external storage sd card. make example more easy inserted content uri file chooser.

i run app on nexus 5x android 7 (sdk 24). minsdkversion set 19 , targetsdkversion 23. 

package de.cowabuja.androiduriaccess;  import android.content.intent; import android.net.uri; import android.support.v7.app.appcompatactivity; import android.os.bundle;  public class mainactivity extends appcompatactivity {      @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);          string uristring = "content://com.android.externalstorage.documents/document/primary%3adcim%2fany%2dir%2fthefile.txt";         uri uri = uri.parse(uristring);          getapplicationcontext().granturipermission(getpackagename(), uri, intent.flag_grant_read_uri_permission);     } }

here log:

... e/androidruntime: fatal exception: main                   process: de.cowabuja.androiduriaccess, pid: 2972                   java.lang.runtimeexception: unable start activity componentinfo{de.cowabuja.androiduriaccess/de.cowabuja.androiduriaccess.mainactivity}: java.lang.securityexception: uid 10132 not have permission uri 0 @ content://com.android.externalstorage.documents/document/primary%3adcim%2fany%2fdir%2fthefile.txt                       @ android.app.activitythread.performlaunchactivity(activitythread.java:2646)                       @ android.app.activitythread.handlelaunchactivity(activitythread.java:2707)                       @ android.app.activitythread.-wrap12(activitythread.java)                       @ android.app.activitythread$h.handlemessage(activitythread.java:1460)                       @ android.os.handler.dispatchmessage(handler.java:102)                       @ android.os.looper.loop(looper.java:154)                       @ android.app.activitythread.main(activitythread.java:6077)                       @ java.lang.reflect.method.invoke(native method)                       @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:865)                       @ com.android.internal.os.zygoteinit.main(zygoteinit.java:755)                    caused by: java.lang.securityexception: uid 10132 not have permission uri 0 @ content://com.android.externalstorage.documents/document/primary%3adcim%2fany%2fdir%2thefile.txt                       @ android.os.parcel.readexception(parcel.java:1683)                       @ android.os.parcel.readexception(parcel.java:1636)                       @ android.app.activitymanagerproxy.granturipermission(activitymanagernative.java:4808)                       @ android.app.contextimpl.granturipermission(contextimpl.java:1655)                       @ android.content.contextwrapper.granturipermission(contextwrapper.java:712)                       @ de.cowabuja.androiduriaccess.mainactivity.oncreate(mainactivity.java:19)                       @ android.app.activity.performcreate(activity.java:6664)                       @ android.app.instrumentation.callactivityoncreate(instrumentation.java:1118)                       @ android.app.activitythread.performlaunchactivity(activitythread.java:2599)                       @ android.app.activitythread.handlelaunchactivity(activitythread.java:2707)                        @ android.app.activitythread.-wrap12(activitythread.java)                        @ android.app.activitythread$h.handlemessage(activitythread.java:1460)                        @ android.os.handler.dispatchmessage(handler.java:102)                        @ android.os.looper.loop(looper.java:154)                        @ android.app.activitythread.main(activitythread.java:6077)                        @ java.lang.reflect.method.invoke(native method)                        @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:865)                        @ com.android.internal.os.zygoteinit.main(zygoteinit.java:755)  ...

i try call granturipermission because try solve exception did before:

java.lang.securityexception: permission denial: reading de.cowabuja.androidaccess uri   content://com.android.externalstorage.documents/document/primary%3adcim%2fany%2dir%2fthefile.txt pid=1399, uid=10350 requires android.permission.manage_documents, or granturipermission()

androidmanifest.xml:

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android"     package="de.cowabuja.androiduriaccess">      <application         android:allowbackup="true"         android:icon="@mipmap/ic_launcher"         android:label="@string/app_name"         android:supportsrtl="true"         android:theme="@style/apptheme">         <activity android:name=".mainactivity">             <intent-filter>                 <action android:name="android.intent.action.main" />                  <category android:name="android.intent.category.launcher" />             </intent-filter>         </activity>          <uses-permission android:name="android.permission.write_external_storage" />         <uses-permission android:name="android.permission.read_external_storage" />     </application> </manifest>

you cannot assemble uri third-party provider , expect work. provider has not granted permission work content. @ most, previously gave temporary access content, rights died when process died.

either:

  • move file 1 of locations have filesystem access on removable storage: getexternalfilesdirs(), getexternalcachedirs(), , getexternalmediadirs(). if methods (on context) return 2+ entries, second , subsequent ones directories on removable storage can use. can use normal java file i/o (e.g., file, fileinputstream).

  • use the storage access framework ask user choose file work with. user may elect choose 1 on removable storage, or not, user's device , user's files. use uri contentresolver, via methods openinputstream().


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