Android 的 READ_EXTERNAL_STORAGE 权限

http://developer.android.com/reference/android/provider/MediaStore.Audio.AudioColumns.html

Try changing the line contentResolver.query

//change it to the columns you need
String[] columns = new String[]{MediaStore.Audio.AudioColumns.DATA};
Cursor cursor = contentResolver.query(uri, columns, null, null, null);

public static final String MEDIA_CONTENT_CONTROL

Not for use by third-party applications due to privacy of media consumption

http://developer.android.com/reference/android/Manifest.permission.html#MEDIA_CONTENT_CONTROL

try to remove the <uses-permission android:name="android.permission.MEDIA_CONTENT_CONTROL"/> first and try again?

Please Check below code that using that You can find all Music Files from sdcard :

public class MainActivity extends Activity{


@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_animations);
getAllSongsFromSDCARD();


}


public void getAllSongsFromSDCARD() {
String[] STAR = { "*" };
Cursor cursor;
Uri allsongsuri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
String selection = MediaStore.Audio.Media.IS_MUSIC + " != 0";


cursor = managedQuery(allsongsuri, STAR, selection, null, null);


if (cursor != null) {
if (cursor.moveToFirst()) {
do {
String song_name = cursor
.getString(cursor
.getColumnIndex(MediaStore.Audio.Media.DISPLAY_NAME));
int song_id = cursor.getInt(cursor
.getColumnIndex(MediaStore.Audio.Media._ID));


String fullpath = cursor.getString(cursor
.getColumnIndex(MediaStore.Audio.Media.DATA));


String album_name = cursor.getString(cursor
.getColumnIndex(MediaStore.Audio.Media.ALBUM));
int album_id = cursor.getInt(cursor
.getColumnIndex(MediaStore.Audio.Media.ALBUM_ID));


String artist_name = cursor.getString(cursor
.getColumnIndex(MediaStore.Audio.Media.ARTIST));
int artist_id = cursor.getInt(cursor
.getColumnIndex(MediaStore.Audio.Media.ARTIST_ID));
System.out.println("sonng name"+fullpath);
} while (cursor.moveToNext());


}
cursor.close();
}
}




}

I have also added following line in the AndroidManifest.xml file as below:

<uses-sdk
android:minSdkVersion="16"
android:targetSdkVersion="17" />


<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" />

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 String[]{Manifest.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

Solutions 2: If it does not work try this:

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M
&& ContextCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},
REQUEST_PERMISSION);


return;

}

and then in callback

@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.
}
}
}

that is from comments. thanks

Has your problem been resolved? What is your target SDK? Try adding android;maxSDKVersion="21" to <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

You have to 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 String[]{Manifest.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 String[]{Manifest.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 String[]{Manifest.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

In addition of all answers. You can also specify the minsdk to apply with this annotation

@TargetApi(_apiLevel_)

I used this in order to accept this request even my minsdk is 18. What it does is that the method only runs when device targets "_apilevel_" and upper. Here's my method:

    @TargetApi(23)
void solicitarPermisos(){


if (ContextCompat.checkSelfPermission(this,permiso)
!= 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 String[]{Manifest.permission.READ_EXTERNAL_STORAGE},
1);


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


return;
}


}

In 2021 I am facing this issue So I will solve this problem using the manifest file I add one tag inside application:

<application
android:requestLegacyExternalStorage="true"
/>

NOTE: This only work until Android 10, see more information here