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I'm trying to access media files (music) on the users device to play them; an easy "hello world"-music player app.

I've followed some tutorials and they basically give the same code. But it won't work; it keeps crashing and telling me:

error.....
Caused by: java.lang.SecurityException: Permission Denial: reading com.android.providers.media.MediaProvider uri content://media/external/audio/media from pid=27696, uid=10059 requires android.permission.READ_EXTERNAL_STORAGE, or grantUriPermission()
....

Now, this is my manifest file:

<?xml version="1.0" encoding="utf-8"?>
<manifest
 xmlns:android="http://schemas.android.com/apk/res/android"
 package="slimsimapps.troff" >

 <uses-permission android:name="android.permission.MEDIA_CONTENT_CONTROL"/>
 <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
 <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>


<application
 android:allowBackup="true"
 android:icon="@mipmap/ic_launcher"
 android:label="@string/app_name"
 android:theme="@style/AppTheme" >
 <activity
 android:name=".MainActivity"
 android:label="@string/app_name" >
 <intent-filter>
 <action android:name="android.intent.action.MAIN" />

 <category android:name="android.intent.category.LAUNCHER" />
 </intent-filter>
 </activity>
</application>
</manifest>

This is my Java-method:

public void initialize() 
 ContentResolver contentResolver = getContentResolver();
 Uri uri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
 Cursor cursor = contentResolver.query(uri, null, null, null, null);
 if (cursor == null) 
 // query failed, handle error.
 else if (!cursor.moveToFirst()) 
 // no media on the device
 else 
 do 
 addSongToXML(cursor);
 while (cursor.moveToNext());
 

I have tried:

To put this at different places in the manifest file:

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE”/>

To add android:maxSdkVersion at Read external storage premission:

<uses-permission
 android:name="android.permission.READ_EXTERNAL_STORAGE"
 android:maxSdkVersion="21" />

To put this in the manifest / application / activity-tag:

android:exported=“true”

To put grantUriPremission between uri and cursro in the javamethod:

grantUriPermission(null, uri, Intent.FLAG_GRANT_READ_URI_PERMISSION);

To use this, it won't crash, but the cursor becomes null:

uri = MediaStore.Audio.Media.getContentUri("EXTERNAL_CONTENT_URI”);

To use INTERNAL content uri, this works as expected, but it only gives "OS-sounds" such as shutter-sound, low-battery-sound, button-click and such:

uri = MediaStore.Audio.Media.INTERNAL_CONTENT_URI;

Pleas help, this should not be a hard problem i know, but i feel like such a beginner!

I have read and tried (or considered them to be not applicable for my problem):

• Android READ_EXTERNAL_STORAGE permission not working


• Require permission only for older android versions: maxSdkVersion does not work?


• Get filename and path from URI from mediastore


• Android KitKat securityException when trying to read from MediaStore


• Android: java.lang.SecurityException: Permission Denial: start Intent

Stack trace:

09-08 06:59:36.619 2009-2009/slimsimapps.troff D/AndroidRuntime﹕ Shutting down VM
 --------- beginning of crash
09-08 06:59:36.619 2009-2009/slimsimapps.troff E/AndroidRuntime﹕ FATAL EXCEPTION: main
 Process: slimsimapps.troff, PID: 2009
 java.lang.IllegalStateException: Could not execute method for android:onClick
 at android.view.View$DeclaredOnClickListener.onClick(View.java:4452)
 at android.view.View.performClick(View.java:5198)
 at android.view.View$PerformClick.run(View.java:21147)
 at android.os.Handler.handleCallback(Handler.java:739)
 at android.os.Handler.dispatchMessage(Handler.java:95)
 at android.os.Looper.loop(Looper.java:148)
 at android.app.ActivityThread.main(ActivityThread.java:5417)
 at java.lang.reflect.Method.invoke(Native Method)
 at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
 Caused by: java.lang.reflect.InvocationTargetException
 at java.lang.reflect.Method.invoke(Native Method)
 at android.view.View$DeclaredOnClickListener.onClick(View.java:4447)
            at android.view.View.performClick(View.java:5198)
            at android.view.View$PerformClick.run(View.java:21147)
            at android.os.Handler.handleCallback(Handler.java:739)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:148)
            at android.app.ActivityThread.main(ActivityThread.java:5417)
            at java.lang.reflect.Method.invoke(Native Method)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
 Caused by: java.lang.SecurityException: Permission Denial: reading com.android.providers.media.MediaProvider uri content://media/external/audio/media from pid=2009, uid=10059 requires android.permission.READ_EXTERNAL_STORAGE, or grantUriPermission()
 at android.os.Parcel.readException(Parcel.java:1599)
 at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:183)
 at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:135)
 at android.content.ContentProviderProxy.query(ContentProviderNative.java:421)
 at android.content.ContentResolver.query(ContentResolver.java:491)
 at android.content.ContentResolver.query(ContentResolver.java:434)
 at slimsimapps.troff.MainActivity.initialize(MainActivity.java:106)
 at slimsimapps.troff.MainActivity.InitializeExternal(MainActivity.java:80)
            at java.lang.reflect.Method.invoke(Native Method)
            at android.view.View$DeclaredOnClickListener.onClick(View.java:4447)
            at android.view.View.performClick(View.java:5198)
            at android.view.View$PerformClick.run(View.java:21147)
            at android.os.Handler.handleCallback(Handler.java:739)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:148)
            at android.app.ActivityThread.main(ActivityThread.java:5417)
            at java.lang.reflect.Method.invoke(Native Method)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
 --------- beginning of system

You have two solutions for your problem. The quick one is to lower targetApi to 22 (build.gradle file).
Second is to use new and wonderful ask-for-permission model:

if (checkSelfPermission(Manifest.permission.READ_EXTERNAL_STORAGE)
 != PackageManager.PERMISSION_GRANTED) 

 // Should we show an explanation?
 if (shouldShowRequestPermissionRationale(
 Manifest.permission.READ_EXTERNAL_STORAGE)) 
 // Explain to the user why we need to read the contacts
 

 requestPermissions(new StringManifest.permission.READ_EXTERNAL_STORAGE,
 MY_PERMISSIONS_REQUEST_READ_EXTERNAL_STORAGE);

 // MY_PERMISSIONS_REQUEST_READ_EXTERNAL_STORAGE is an
 // app-defined int constant that should be quite unique

 return;

Sniplet found here: https://developer.android.com/training/permissions/requesting.html

You have ask for the permission at run time:

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M
 && ContextCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) 
 ActivityCompat.requestPermissions(this, new StringManifest.permission.READ_EXTERNAL_STORAGE,
 REQUEST_PERMISSION);
 dialog.dismiss();
 return;

And in the callback below you can access the storage without a problem.

@Override
public void onRequestPermissionsResult(final int requestCode, @NonNull final String permissions, @NonNull final int grantResults) 
 super.onRequestPermissionsResult(requestCode, permissions, grantResults);
 if (requestCode == REQUEST_PERMISSION) 
 if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) 
 // Permission granted.
 else 
 // User refused to grant permission.
 
 

Step1: add permission on android manifest.xml

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

Step2: onCreate() method

int permissionCheck = ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE);

 if (permissionCheck != PackageManager.PERMISSION_GRANTED) 
 ActivityCompat.requestPermissions(this, new StringManifest.permission.WRITE_EXTERNAL_STORAGE, MY_PERMISSIONS_REQUEST_READ_MEDIA);
 else 
 readDataExternal();
 

Step3: override onRequestPermissionsResult method to get callback

 @Override
public void onRequestPermissionsResult(int requestCode, String permissions, int grantResults) 
 switch (requestCode) 
 case MY_PERMISSIONS_REQUEST_READ_MEDIA:
 if ((grantResults.length > 0) && (grantResults[0] == PackageManager.PERMISSION_GRANTED)) 
 readDataExternal();
 
 break;

 default:
 break;
 

Note: readDataExternal() is method to get data from external storage.

Thanks.

I also had a similar error log and here's what I did-

1. 
   

   In onCreate method we request a Dialog Box for checking permissions

   
   
   

   ActivityCompat.requestPermissions(MainActivity.this,
   new StringManifest.permission.READ_EXTERNAL_STORAGE,1);
   

   
   


2. 
   

   Method to check for the result

   
   
   

   @Override
   public void onRequestPermissionsResult(int requestCode, String permissions, int grantResults) 
   switch (requestCode) 
    case 1: 
    // If request is cancelled, the result arrays are empty.
    if (grantResults.length > 0
    && grantResults[0] == PackageManager.PERMISSION_GRANTED) 
    // permission granted and now can proceed
    mymethod(); //a sample method called
   
    else 
   
    // permission denied, boo! Disable the
    // functionality that depends on this permission.
    Toast.makeText(MainActivity.this, "Permission denied to read your External storage", Toast.LENGTH_SHORT).show();
    
    return;
    
    // add other cases for more permissions
    
   
   

   
   

The official documentation to Requesting Runtime Permissions