diff --git a/.idea/inspectionProfiles/Project_Default.xml b/.idea/inspectionProfiles/Project_Default.xml
index bab81860..43fe0932 100644
--- a/.idea/inspectionProfiles/Project_Default.xml
+++ b/.idea/inspectionProfiles/Project_Default.xml
@@ -1,6 +1,7 @@
 <component name="InspectionProjectProfileManager">
   <profile version="1.0">
     <option name="myName" value="Project Default" />
+    <inspection_tool class="AndroidLintButtonStyle" enabled="false" level="WARNING" enabled_by_default="false" />
     <inspection_tool class="AndroidLintSetTextI18n" enabled="false" level="WARNING" enabled_by_default="false" />
     <inspection_tool class="EmptyStatementBody" enabled="false" level="WARNING" enabled_by_default="false">
       <option name="m_reportEmptyBlocks" value="true" />
diff --git a/app/src/main/java/jp/juggler/subwaytooter/ActAppSetting.java b/app/src/main/java/jp/juggler/subwaytooter/ActAppSetting.java
index 826f55ec..e909a8c7 100644
--- a/app/src/main/java/jp/juggler/subwaytooter/ActAppSetting.java
+++ b/app/src/main/java/jp/juggler/subwaytooter/ActAppSetting.java
@@ -52,7 +52,7 @@ public class ActAppSetting extends AppCompatActivity
 	Switch swDontRound;
 	Switch swDontUseStreaming;
 	Switch swDontRefreshOnResume;
-	
+	Switch swDontScreenOff;
 	
 	Spinner spBackButtonAction;
 	Spinner spUITheme;
@@ -108,6 +108,10 @@ public class ActAppSetting extends AppCompatActivity
 		swDontRefreshOnResume = (Switch) findViewById( R.id.swDontRefreshOnResume );
 		swDontRefreshOnResume.setOnCheckedChangeListener( this );
 		
+		swDontScreenOff= (Switch) findViewById( R.id.swDontScreenOff );
+		swDontScreenOff.setOnCheckedChangeListener( this );
+		
+		
 		cbNotificationSound = (CheckBox) findViewById( R.id.cbNotificationSound );
 		cbNotificationVibration = (CheckBox) findViewById( R.id.cbNotificationVibration );
 		cbNotificationLED = (CheckBox) findViewById( R.id.cbNotificationLED );
@@ -201,7 +205,8 @@ public class ActAppSetting extends AppCompatActivity
 		swDontRound.setChecked( pref.getBoolean( Pref.KEY_DONT_ROUND, false ) );
 		swDontUseStreaming.setChecked( pref.getBoolean( Pref.KEY_DONT_USE_STREAMING, false ) );
 		swDontRefreshOnResume.setChecked( pref.getBoolean( Pref.KEY_DONT_REFRESH_ON_RESUME , false ) );
-		
+		swDontScreenOff.setChecked( pref.getBoolean( Pref.KEY_DONT_SCREEN_OFF , false ) );
+
 		cbNotificationSound.setChecked( pref.getBoolean( Pref.KEY_NOTIFICATION_SOUND, true ) );
 		cbNotificationVibration.setChecked( pref.getBoolean( Pref.KEY_NOTIFICATION_VIBRATION, true ) );
 		cbNotificationLED.setChecked( pref.getBoolean( Pref.KEY_NOTIFICATION_LED, true ) );
@@ -233,6 +238,8 @@ public class ActAppSetting extends AppCompatActivity
 			.putBoolean( Pref.KEY_DONT_ROUND, swDontRound.isChecked() )
 			.putBoolean( Pref.KEY_DONT_USE_STREAMING, swDontUseStreaming.isChecked() )
 			.putBoolean( Pref.KEY_DONT_REFRESH_ON_RESUME, swDontRefreshOnResume.isChecked() )
+			.putBoolean( Pref.KEY_DONT_SCREEN_OFF, swDontScreenOff.isChecked() )
+		
 			
 			.putBoolean( Pref.KEY_NOTIFICATION_SOUND, cbNotificationSound.isChecked() )
 			.putBoolean( Pref.KEY_NOTIFICATION_VIBRATION, cbNotificationVibration.isChecked() )
diff --git a/app/src/main/java/jp/juggler/subwaytooter/ActMain.java b/app/src/main/java/jp/juggler/subwaytooter/ActMain.java
index bd2a5e4f..a15daf3d 100644
--- a/app/src/main/java/jp/juggler/subwaytooter/ActMain.java
+++ b/app/src/main/java/jp/juggler/subwaytooter/ActMain.java
@@ -26,6 +26,7 @@ import android.support.v7.app.AppCompatActivity;
 import android.view.Menu;
 import android.view.MenuItem;
 import android.view.Window;
+import android.view.WindowManager;
 import android.widget.HorizontalScrollView;
 import android.widget.ImageButton;
 import android.widget.ImageView;
@@ -129,6 +130,12 @@ public class ActMain extends AppCompatActivity
 
 		MyClickableSpan.link_callback = link_click_listener;
 		
+		if( pref.getBoolean( Pref.KEY_DONT_SCREEN_OFF,false )){
+			getWindow().addFlags( WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
+		}else{
+			getWindow().clearFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
+		}
+		
 		// アカウント設定から戻ってきたら、カラムを消す必要があるかもしれない
 		{
 			
diff --git a/app/src/main/java/jp/juggler/subwaytooter/Pref.java b/app/src/main/java/jp/juggler/subwaytooter/Pref.java
index bbd4c3fb..f8d36b80 100644
--- a/app/src/main/java/jp/juggler/subwaytooter/Pref.java
+++ b/app/src/main/java/jp/juggler/subwaytooter/Pref.java
@@ -39,6 +39,7 @@ public class Pref {
 	
 	static final String KEY_DONT_USE_STREAMING = "dont_use_streaming";
 	static final String KEY_DONT_REFRESH_ON_RESUME = "dont_refresh_on_resume";
+	static final String KEY_DONT_SCREEN_OFF = "dont_screen_off";
 	
 	
 	
diff --git a/app/src/main/java/jp/juggler/subwaytooter/api/TootApiClient.java b/app/src/main/java/jp/juggler/subwaytooter/api/TootApiClient.java
index b4602e2b..b24dcc29 100644
--- a/app/src/main/java/jp/juggler/subwaytooter/api/TootApiClient.java
+++ b/app/src/main/java/jp/juggler/subwaytooter/api/TootApiClient.java
@@ -9,11 +9,11 @@ import org.json.JSONArray;
 import org.json.JSONObject;
 
 import jp.juggler.subwaytooter.App1;
+import jp.juggler.subwaytooter.table.ClientInfo;
 import jp.juggler.subwaytooter.table.SavedAccount;
 import jp.juggler.subwaytooter.util.LogCategory;
 import jp.juggler.subwaytooter.R;
 import jp.juggler.subwaytooter.util.Utils;
-import jp.juggler.subwaytooter.table.ClientInfo;
 import okhttp3.Call;
 import okhttp3.MediaType;
 import okhttp3.OkHttpClient;
@@ -236,96 +236,83 @@ public class TootApiClient {
 	
 	public TootApiResult authorize1(){
 		
-		JSONObject client_info = null;
+		JSONObject client_info;
+
+		// サーバ側がクライアント情報を消した場合、今の認証フローではアプリがそれを知ることができない
+		// 毎回クライアント情報を作ることでしか対策できない
+
+		callback.publishApiProgress( context.getString( R.string.register_app_to_server, instance ) );
+
+		// OAuth2 クライアント登録
+		String client_name = "SubwayTooter"; // + UUID.randomUUID().toString();
 		
-		for( ; ; ){
-			if( callback.isApiCancelled() ) return null;
-			
-			if( client_info == null ){
-				// DBからまず探す
-				client_info = ClientInfo.load( instance );
-				if( client_info != null && client_info.optInt( KEY_AUTH_VERSION, 0 ) < AUTH_VERSION ){
-					// このトークンは形式が古くて使えないよ
-					client_info = null;
-				}
-				
-				if( client_info != null ) continue;
-				
-				callback.publishApiProgress( context.getString( R.string.register_app_to_server, instance ) );
-				
-				// OAuth2 クライアント登録
-				String client_name = "SubwayTooter"; // + UUID.randomUUID().toString();
-				
-				Request request = new Request.Builder()
-					.url( "https://" + instance + "/api/v1/apps" )
-					.post( RequestBody.create( MEDIA_TYPE_FORM_URL_ENCODED
-						, "client_name=" + Uri.encode( client_name )
-							+ "&redirect_uris=" + Uri.encode( REDIRECT_URL )
-							+ "&scopes=read write follow"
-					) )
-					.build();
-				Call call = ok_http_client.newCall( request );
-				
-				Response response;
-				try{
-					response = call.execute();
-				}catch( Throwable ex ){
-					ex.printStackTrace(  );
-					return new TootApiResult( Utils.formatError( ex, context.getResources(), R.string.network_error ) );
-				}
-				if( callback.isApiCancelled() ) return null;
-				
-				if( ! response.isSuccessful() ){
-					return new TootApiResult( context.getString( R.string.network_error_arg, response ) );
-				}
-				try{
-					String json = response.body().string();
-					if( TextUtils.isEmpty( json ) || json.startsWith( "<" ) ){
-						return new TootApiResult( context.getString( R.string.response_not_json ) + "\n" + json );
-					}
-					// {"id":999,"redirect_uri":"urn:ietf:wg:oauth:2.0:oob","client_id":"******","client_secret":"******"}
-					client_info = new JSONObject( json );
-					String error = Utils.optStringX( client_info, "error" );
-					if( ! TextUtils.isEmpty( error ) ){
-						return new TootApiResult( context.getString( R.string.api_error, error ) );
-					}
-					client_info.put( KEY_AUTH_VERSION, AUTH_VERSION );
-					ClientInfo.save( instance, client_info.toString() );
-					continue;
-				}catch( Throwable ex ){
-					ex.printStackTrace();
-					return new TootApiResult( Utils.formatError( ex, "API data error" ) );
-				}
-			}
-			
-			// 認証ページURLを作る
-			final String browser_url = "https://" + instance + "/oauth/authorize"
-				+ "?client_id=" + Uri.encode( Utils.optStringX( client_info, "client_id" ) )
-				// この段階では要らない		+ "&client_secret=" + Uri.encode( Utils.optStringX( client_info, "client_secret" ) )
-				+ "&response_type=code"
-				+ "&redirect_uri=" + Uri.encode( REDIRECT_URL )
-				+ "&scope=read write follow"
-				+ "&scopes=read write follow"
-				+ "&state=" + ( account != null ? "db:" + account.db_id : "host:" + instance )
-				+ "&grant_type=authorization_code"
-				//	+ "&username=" + Uri.encode( user_mail )
-				//	+ "&password=" + Uri.encode( password )
-				+ "&approval_prompt=force"
-				//		+"&access_type=offline"
-				;
-			// APIリクエストは失敗?する
-			// URLをエラーとして返す
-			return new TootApiResult( browser_url );
+		Request request = new Request.Builder()
+			.url( "https://" + instance + "/api/v1/apps" )
+			.post( RequestBody.create( MEDIA_TYPE_FORM_URL_ENCODED
+				, "client_name=" + Uri.encode( client_name )
+					+ "&redirect_uris=" + Uri.encode( REDIRECT_URL )
+					+ "&scopes=read write follow"
+			) )
+			.build();
+		Call call = ok_http_client.newCall( request );
+		
+		Response response;
+		try{
+			response = call.execute();
+		}catch( Throwable ex ){
+			ex.printStackTrace(  );
+			return new TootApiResult( Utils.formatError( ex, context.getResources(), R.string.network_error ) );
 		}
+		if( callback.isApiCancelled() ) return null;
 		
+		if( ! response.isSuccessful() ){
+			return new TootApiResult( context.getString( R.string.network_error_arg, response ) );
+		}
+		try{
+			String json = response.body().string();
+			if( TextUtils.isEmpty( json ) || json.startsWith( "<" ) ){
+				return new TootApiResult( context.getString( R.string.response_not_json ) + "\n" + json );
+			}
+			// {"id":999,"redirect_uri":"urn:ietf:wg:oauth:2.0:oob","client_id":"******","client_secret":"******"}
+			client_info = new JSONObject( json );
+			String error = Utils.optStringX( client_info, "error" );
+			if( ! TextUtils.isEmpty( error ) ){
+				return new TootApiResult( context.getString( R.string.api_error, error ) );
+			}
+			client_info.put( KEY_AUTH_VERSION, AUTH_VERSION );
+
+			// authorize2 で使う
+			ClientInfo.save( instance, client_info.toString() );
+
+		}catch( Throwable ex ){
+			ex.printStackTrace();
+			return new TootApiResult( Utils.formatError( ex, "API data error" ) );
+		}
+	
+		
+		// 認証ページURLを作る
+		final String browser_url = "https://" + instance + "/oauth/authorize"
+			+ "?client_id=" + Uri.encode( Utils.optStringX( client_info, "client_id" ) )
+			// この段階では要らない		+ "&client_secret=" + Uri.encode( Utils.optStringX( client_info, "client_secret" ) )
+			+ "&response_type=code"
+			+ "&redirect_uri=" + Uri.encode( REDIRECT_URL )
+			+ "&scope=read write follow"
+			+ "&scopes=read write follow"
+			+ "&state=" + ( account != null ? "db:" + account.db_id : "host:" + instance )
+			+ "&grant_type=authorization_code"
+			//	+ "&username=" + Uri.encode( user_mail )
+			//	+ "&password=" + Uri.encode( password )
+			+ "&approval_prompt=force"
+			//		+"&access_type=offline"
+			;
+		// APIリクエストは失敗?する
+		// URLをエラーとして返す
+		return new TootApiResult( browser_url );
 	}
 	
 	public TootApiResult authorize2( String code ){
 		
 		JSONObject client_info = ClientInfo.load( instance );
-		if( client_info != null && client_info.optInt( KEY_AUTH_VERSION, 0 ) < AUTH_VERSION ){
-			client_info = null;
-		}
 		if( client_info == null ){
 			return new TootApiResult( "missing client id" );
 		}
diff --git a/app/src/main/res/layout/act_app_setting.xml b/app/src/main/res/layout/act_app_setting.xml
index 52482dd3..bc808657 100644
--- a/app/src/main/res/layout/act_app_setting.xml
+++ b/app/src/main/res/layout/act_app_setting.xml
@@ -2,9 +2,12 @@
 <ScrollView
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+
+    tools:ignore="TooManyViews"
+
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    xmlns:app="http://schemas.android.com/apk/res-auto"
     android:clipToPadding="false"
     android:fillViewport="true"
 
@@ -14,7 +17,6 @@
     android:paddingStart="@dimen/activity_horizontal_margin"
     android:paddingTop="@dimen/activity_vertical_margin"
 
-
     android:scrollbarStyle="outsideOverlay"
     >
 
@@ -392,7 +394,8 @@
         </LinearLayout>
 
 
-        <LinearLayout style="@style/setting_row_form">
+        <LinearLayout style="@style/setting_row_form"
+                      >
 
             <TextView
                 style="@style/setting_row_label"
@@ -479,6 +482,21 @@
 
         <View style="@style/setting_divider"/>
 
+        <TextView
+            style="@style/setting_row_label"
+            android:text="@string/dont_screen_off"
+            />
+
+        <LinearLayout style="@style/setting_row_form">
+
+            <Switch
+                android:id="@+id/swDontScreenOff"
+                style="@style/setting_horizontal_stretch"
+                />
+
+        </LinearLayout>
+
+        <View style="@style/setting_divider"/>
 
         <!--<TextView-->
         <!--style="@style/setting_row_label"-->
diff --git a/app/src/main/res/values-fr/strings.xml b/app/src/main/res/values-fr/strings.xml
index a4e16fd7..b728b542 100644
--- a/app/src/main/res/values-fr/strings.xml
+++ b/app/src/main/res/values-fr/strings.xml
@@ -307,5 +307,6 @@
     <string name="already_boosted">Already boosted.</string>
     <string name="already_favourited">Already favourited.</string>
     <string name="status_id_conversion_failed">Status id conversion failed.</string>
+    <string name="dont_screen_off">Don\'t screen off while main activity is shown</string>
 
 </resources>
diff --git a/app/src/main/res/values-ja/strings.xml b/app/src/main/res/values-ja/strings.xml
index 8bb85747..96fdb926 100644
--- a/app/src/main/res/values-ja/strings.xml
+++ b/app/src/main/res/values-ja/strings.xml
@@ -593,4 +593,5 @@
     <string name="already_boosted">既にブースト済みです</string>
     <string name="already_favourited">既にお気に入り済みです</string>
     <string name="status_id_conversion_failed">ステータスIDを変換できませんでした</string>
+    <string name="dont_screen_off">メイン画面表示中は自動消灯無効</string>
 </resources>
\ No newline at end of file
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index aecb9934..a69d6916 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -303,4 +303,5 @@
     <string name="status_id_conversion_failed">Status id conversion failed.</string>
     <string name="already_favourited">Already favourited.</string>
     <string name="already_boosted">Already boosted.</string>
+    <string name="dont_screen_off">Don\'t screen off while main activity is shown</string>
 </resources>