System.DllNotFoundException: libsqlite3_xamarin when connecting to SQLite database in Android 7+

Question

I am new to Xamarin and trying to create an app. When I try to create a SQLite database in Android below 7 then it's working perfectly. But when I am trying to create a database in 7 and 7.1 then I get this error. For this problem, see this link to the Xamarin discussion forum and I integrated the code:

 public SQLite.Net.SQLiteConnection GetConnection()
    {

        var sqliteFilename = "ADB.db3";
        string documentsPath = System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal);
        var path = Path.Combine(documentsPath, sqliteFilename);

        if (!File.Exists(path))
        {
            using (var br = new BinaryReader(Android.App.Application.Context.Assets.Open("ATSDB.db3")))
            {
                using (var bw = new BinaryWriter(new FileStream(path, FileMode.Create)))
                {
                    byte[] buffer = new byte[2048];
                    int length = 0;
                    while ((length = br.Read(buffer, 0, buffer.Length)) > 0)
                    {
                        bw.Write(buffer, 0, length);
                    }
                }
            }
        }



        // var plat = new SQLite.Net.Platform.XamarinAndroid.SQLitePlatformAndroid();
        var plat = new SQLite.Net.Platform.XamarinAndroid.SQLitePlatformAndroidN();

        var conn = new SQLite.Net.SQLiteConnection(plat, path);
        // Return the database connection 
        return conn;

    }

**at this line I am getting Error ** var conn = new SQLite.Net.SQLiteConnection(plat, path); // Return the database connection

I am getting below error :

{System.DllNotFoundException: libsqlite3_xamarin      
    at (wrapper managed-to-native) SQLite.Net.Platform.XamarinAndroid.SQLiteApiAndroidNInternal:sqlite3_open_v2 (byte[],intptr&,int,intptr)

    at SQLite.Net.Platform.XamarinAndroid.SQLiteApiAndroidN.Open (System.Byte[] filename, SQLite.Net.Interop.IDbHandle& db, System.Int32 flags, System.IntPtr zvfs) [0x00000] in <360d65bfaa3e44c0b2b5840d827a452d>:0 

    at SQLite.Net.SQLiteConnection..ctor (SQLite.Net.Interop.ISQLitePlatform sqlitePlatform, System.String databasePath, 
    SQLite.Net.Interop.SQLiteOpenFlags openFlags, System.Boolean storeDateTimeAsTicks, SQLite.Net.IBlobSerializer serializer, System.Collections.Generic.IDictionary`2[TKey,TValue] tableMappings, System.Collections.Generic.IDictionary`2[TKey,TValue] extraTypeMappings, 
    SQLite.Net.IContractResolver resolver) [0x000a2] in <8f2bb39aeff94a30a8628064be9c7efe>:0 

    at SQLite.Net.SQLiteConnection..ctor (SQLite.Net.Interop.ISQLitePlatform sqlitePlatform, System.String databasePath, System.Boolean storeDateTimeAsTicks, 
    SQLite.Net.IBlobSerializer serializer, System.Collections.Generic.IDictionary`2[TKey,TValue] tableMappings, System.Collections.Generic.IDictionary`2[TKey,TValue] 
    extraTypeMappings, SQLite.Net.IContractResolver resolver) [0x00000] 
    in <8f2bb39aeff94a30a8628064be9c7efe>:0 
    at ATSDriver.Droid.SqliteService.GetConnection () [0x000b5] 
    in E:\Projects\DriverApp\Source\ATSDriver\ATSDriver\ATSDriver.Android\SqliteService.cs:52 

at ATSDriver.DataAccess..ctor () [0x00009] in E:\Projects\DriverApp\Source\ATSDriver\ATSDriver\ATSDriver\DataAccess.cs:17 }

Hope some one can help me to resolve this.

Answer 1

In my case (targeting Android 9.0), I noticed that the Debug build worked, while the Release build did not. That's often a sign the linker is discarding too much. Adding Mono.Data.Sqlite to the 'Ignore assemblies' linker options did the trick for me: