move the notes in a viewpager

app/src/main/kotlin/com/simplemobiletools/notes/adapters/NotesPagerAdapter.kt

@@ -0,0 +1,38 @@
+package com.simplemobiletools.notes.adapters
+
+import android.os.Bundle
+import android.support.v4.app.Fragment
+import android.support.v4.app.FragmentManager
+import android.support.v4.app.FragmentStatePagerAdapter
+import android.util.SparseArray
+import com.simplemobiletools.notes.NOTE_ID
+import com.simplemobiletools.notes.fragments.NoteFragment
+import com.simplemobiletools.notes.models.Note
+
+class NotesPagerAdapter(fm: FragmentManager, private val notes: List<Note>) : FragmentStatePagerAdapter(fm) {
+    lateinit var fragments: SparseArray<NoteFragment>
+
+    init {
+        fragments = SparseArray(10)
+    }
+
+    override fun getCount() = notes.size
+
+    override fun getItem(position: Int): Fragment {
+        val bundle = Bundle()
+        val id = notes[position].id
+        bundle.putInt(NOTE_ID, id)
+
+        if (fragments.get(position) != null)
+            return fragments[position]
+
+        val fragment = NoteFragment()
+        fragment.arguments = bundle
+        fragments.put(position, fragment)
+        return fragment
+    }
+
+    fun saveNote(pos: Int) {
+        fragments.get(pos)?.saveText()
+    }
+}