up ReaderProvider.kt

app/src/main/java/io/legado/app/api/ReaderProvider.kt

@@ -7,10 +7,7 @@ import android.content.ContentProvider
 import android.content.ContentResolver
 import android.content.ContentValues
 import android.content.UriMatcher
-import android.database.CharArrayBuffer
-import android.database.ContentObserver
-import android.database.Cursor
-import android.database.DataSetObserver
+import android.database.*
 import android.net.Uri
 import android.os.Bundle
 import com.google.gson.Gson
@@ -116,33 +113,15 @@ class ReaderProvider : ContentProvider() {
      *
      * Only getString() makes sense.
      */
-    private class SimpleCursor(data: ReturnData?) : Cursor {
+    private class SimpleCursor(data: ReturnData?) : MatrixCursor(arrayOf("result"), 1) {
 
         private val mData: String = Gson().toJson(data)
 
-        override fun getCount() = 1
-
-        override fun getPosition() = 0
-
-        override fun move(i: Int) = true
-
-        override fun moveToPosition(i: Int) = true
-
-        override fun moveToFirst() = true
-
-        override fun moveToLast() = true
-
-        override fun moveToNext() = true
-
-        override fun moveToPrevious() = true
-
-        override fun isFirst() = true
-
-        override fun isLast() = true
-
-        override fun isBeforeFirst() = true
+        init {
+            addRow(arrayOf(mData))
+        }
 
-        override fun isAfterLast() = true
+        override fun getCount() = 1
 
         override fun getColumnIndex(s: String) = 0