diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index f3bcd749..020db042 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -280,13 +280,6 @@
             </intent-filter>
         </receiver>
 
-        <receiver android:name=".ChooseReceiver" android:exported="false"/>
-
-        <!-- okhttp3クライアントを指定する必要があるため、マニフェスト経由での組み込みは行わない -->
-        <!--<meta-data-->
-        <!--android:name="com.bumptech.glide.integration.okhttp3.OkHttpGlideModule"-->
-        <!--android:value="GlideModule" />-->
-
         <service
             android:name=".MyFirebaseMessagingService"
             tools:ignore="ExportedService"
diff --git a/app/src/main/java/jp/juggler/subwaytooter/ActAppSetting.kt b/app/src/main/java/jp/juggler/subwaytooter/ActAppSetting.kt
index ef7391d8..f228319a 100644
--- a/app/src/main/java/jp/juggler/subwaytooter/ActAppSetting.kt
+++ b/app/src/main/java/jp/juggler/subwaytooter/ActAppSetting.kt
@@ -156,13 +156,8 @@ class ActAppSetting : AppCompatActivity(), ColorPickerDialogListener, View.OnCli
 		if(sv != null) outState.putString(STATE_CHOOSE_INTENT_TARGET, sv)
 	}
 	
-	override fun onResume() {
-		super.onResume()
-		onCustomShareSelected()
-	}
-	
-	override fun onPause() {
-		super.onPause()
+	override fun onStop() {
+		super.onStop()
 		
 		// Pull通知チェック間隔を変更したかもしれないのでジョブを再設定する
 		try {
@@ -1196,16 +1191,6 @@ class ActAppSetting : AppCompatActivity(), ColorPickerDialogListener, View.OnCli
 		}
 	}
 	
-	private fun onCustomShareSelected() {
-		if(isDestroyed) return
-		
-		val cn = ChooseReceiver.lastComponentName
-		if(cn != null) {
-			ChooseReceiver.lastComponentName = null
-			setCustomShare(customShareTarget, "${cn.packageName}/${cn.className}")
-		}
-	}
-	
 	fun setCustomShare(target : CustomShareTarget?, value : String) {
 		
 		target ?: return
diff --git a/app/src/main/java/jp/juggler/subwaytooter/AppDataExporter.kt b/app/src/main/java/jp/juggler/subwaytooter/AppDataExporter.kt
index fe8f471b..d88db5f1 100644
--- a/app/src/main/java/jp/juggler/subwaytooter/AppDataExporter.kt
+++ b/app/src/main/java/jp/juggler/subwaytooter/AppDataExporter.kt
@@ -238,6 +238,7 @@ object AppDataExporter {
 	
 	@Throws(IOException::class)
 	private fun writePref(writer : JsonWriter, pref : SharedPreferences) {
+		writer.name(KEY_PREF)
 		writer.beginObject()
 		for((k, v) in pref.all) {
 			writer.name(k)
@@ -250,13 +251,7 @@ object AppDataExporter {
 					(v is Float && v.isNaN()) -> writer.value(MAGIC_NAN)
 					else -> writer.value(v)
 				}
-				else -> throw RuntimeException(
-					String.format(
-						Locale.JAPAN,
-						"writePref. bad data type: Preference key =%s",
-						k
-					)
-				)
+				else -> error("writePref: bad data type. key=$k, type=${v.javaClass.simpleName}")
 			}
 		}
 		writer.endObject()
@@ -306,6 +301,7 @@ object AppDataExporter {
 	
 	@Throws(IOException::class, JsonException::class)
 	private fun writeColumn(app_state : AppState, writer : JsonWriter) {
+		writer.name(KEY_COLUMN)
 		writer.beginArray()
 		for(column in app_state.column_list) {
 			writer.writeJsonValue(jsonObject { column.encodeJSON(this, 0) })
@@ -318,21 +314,20 @@ object AppDataExporter {
 		app_state : AppState,
 		reader : JsonReader,
 		id_map : HashMap<Long, Long>
-	) : ArrayList<Column> {
-		val result = ArrayList<Column>()
+	) = ArrayList<Column>().also{ result->
 		reader.beginArray()
 		while(reader.hasNext()) {
-			val item = reader.readJsonValue().cast<JsonObject>() !!
+			val item :JsonObject = reader.readJsonValue().cast() !!
 			
+			// DB上のアカウントIDが変化したので置き換える
 			when(val old_id = item.long(Column.KEY_ACCOUNT_ROW_ID) ?: - 1L) {
+				
 				// 検索カラムのアカウントIDはNAアカウントと紐ついている。変換の必要はない
 				- 1L -> {
 				}
 				
-				else -> {
-					item[Column.KEY_ACCOUNT_ROW_ID] = id_map[old_id]
-						?: error("readColumn: can't convert account id")
-				}
+				else -> item[Column.KEY_ACCOUNT_ROW_ID] = id_map[old_id]
+					?: error("readColumn: can't convert account id")
 			}
 			
 			try {
@@ -344,7 +339,6 @@ object AppDataExporter {
 			}
 		}
 		reader.endArray()
-		return result
 	}
 	
 	@Throws(IOException::class, JsonException::class)
@@ -353,29 +347,18 @@ object AppDataExporter {
 		writer.beginObject()
 		
 		val app_state = App1.getAppState(context)
-		//////////////////////////////////////
-		run {
-			writer.name(KEY_PREF)
-			writePref(writer, app_state.pref)
-		}
-		//////////////////////////////////////
+		
+		writePref(writer, app_state.pref)
+
 		writeFromTable(writer, KEY_ACCOUNT, SavedAccount.table)
 		writeFromTable(writer, KEY_ACCT_COLOR, AcctColor.table)
 		writeFromTable(writer, KEY_MUTED_APP, MutedApp.table)
 		writeFromTable(writer, KEY_MUTED_WORD, MutedWord.table)
 		writeFromTable(writer, KEY_FAV_MUTE, FavMute.table)
 		writeFromTable(writer, KEY_HIGHLIGHT_WORD, HighlightWord.table)
-		
-		// 端末間でクライアントIDを再利用することはできなくなった
-		//writeFromTable(writer, KEY_CLIENT_INFO, ClientInfo.table)
-		
-		//////////////////////////////////////
-		run {
-			writer.name(KEY_COLUMN)
-			writeColumn(app_state, writer)
-			
-		}
-		
+
+		writeColumn(app_state, writer)
+
 		writer.endObject()
 	}
 	
diff --git a/app/src/main/java/jp/juggler/subwaytooter/ChooseReceiver.kt b/app/src/main/java/jp/juggler/subwaytooter/ChooseReceiver.kt
deleted file mode 100644
index b062ddf0..00000000
--- a/app/src/main/java/jp/juggler/subwaytooter/ChooseReceiver.kt
+++ /dev/null
@@ -1,31 +0,0 @@
-package jp.juggler.subwaytooter
-
-import android.content.BroadcastReceiver
-import android.content.ComponentName
-import android.content.Context
-import android.content.Intent
-import android.os.Build
-import jp.juggler.util.LogCategory
-import java.lang.ref.WeakReference
-
-class ChooseReceiver : BroadcastReceiver() {
-	
-	companion object {
-		private val log = LogCategory("ChooseReceiver")
-		var lastComponentName : ComponentName? = null
-		var refCallback : WeakReference<() -> Unit>? = null
-		
-		fun setCallback(cb : () -> Unit) {
-			refCallback = WeakReference(cb)
-		}
-	}
-	
-	override fun onReceive(context : Context, intent : Intent?) {
-		if(Build.VERSION.SDK_INT >= 22) {
-			lastComponentName = intent?.extras?.get(Intent.EXTRA_CHOSEN_COMPONENT) as? ComponentName
-			refCallback?.get()?.invoke()
-		} else {
-			log.w("onReceive: Intent.EXTRA_CHOSEN_COMPONENT can't be used in API level 21")
-		}
-	}
-}