diff --git a/src/src/main/java/net/micode/notes/ui/activities/NoteEditActivity.java b/src/src/main/java/net/micode/notes/ui/activities/NoteEditActivity.java
index 1339016..854297f 100644
--- a/src/src/main/java/net/micode/notes/ui/activities/NoteEditActivity.java
+++ b/src/src/main/java/net/micode/notes/ui/activities/NoteEditActivity.java
@@ -43,6 +43,7 @@ import android.view.MotionEvent;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.view.WindowManager;
+import android.widget.Button;
 import android.widget.CheckBox;
 import android.widget.CompoundButton;
 import android.widget.CompoundButton.OnCheckedChangeListener;
@@ -180,6 +181,15 @@ public class NoteEditActivity extends Activity implements OnClickListener,
             return;
         }
         initResources();
+        Button previewBtn = (Button) this.findViewById(R.id.preview_btn);
+        previewBtn.setOnClickListener((e)->{
+            // jump to preview layout
+            Intent intent = new Intent();
+            intent.setClass(NoteEditActivity.this,PreviewActivity.class);
+            getWorkingText();
+            PreviewActivity.text = mWorkingNote.getContent();
+            startActivity(intent);
+        });
     }
 
     /**
diff --git a/src/src/main/java/net/micode/notes/ui/activities/NotesListActivity.java b/src/src/main/java/net/micode/notes/ui/activities/NotesListActivity.java
index 10a192f..dc45586 100644
--- a/src/src/main/java/net/micode/notes/ui/activities/NotesListActivity.java
+++ b/src/src/main/java/net/micode/notes/ui/activities/NotesListActivity.java
@@ -63,7 +63,6 @@ import android.widget.Toast;
 import net.micode.notes.R;
 import net.micode.notes.data.Notes;
 import net.micode.notes.data.Notes.NoteColumns;
-import net.micode.notes.gtask.remote.GTaskSyncService;
 import net.micode.notes.model.WorkingNote;
 import net.micode.notes.tool.BackupUtils;
 import net.micode.notes.tool.DataUtils;
@@ -775,8 +774,6 @@ public class NotesListActivity extends Activity implements OnClickListener, OnIt
         if (mState == ListEditState.NOTE_LIST) {
             getMenuInflater().inflate(R.menu.note_list, menu);
             // set sync or sync_cancel
-            menu.findItem(R.id.menu_sync).setTitle(
-                    GTaskSyncService.isSyncing() ? R.string.menu_sync_cancel : R.string.menu_sync);
         } else if (mState == ListEditState.SUB_FOLDER) {
             getMenuInflater().inflate(R.menu.sub_folder, menu);
         } else if (mState == ListEditState.CALL_RECORD_FOLDER) {
@@ -801,9 +798,9 @@ public class NotesListActivity extends Activity implements OnClickListener, OnIt
             case R.id.menu_sync: {
                 if (isSyncMode()) {
                     if (TextUtils.equals(item.getTitle(), getString(R.string.menu_sync))) {
-                        GTaskSyncService.startSync(this);
+
                     } else {
-                        GTaskSyncService.cancelSync(this);
+
                     }
                 } else {
                     startPreferenceActivity();
diff --git a/src/src/main/java/net/micode/notes/ui/activities/NotesPreferenceActivity.java b/src/src/main/java/net/micode/notes/ui/activities/NotesPreferenceActivity.java
index a705a89..94c2a1e 100644
--- a/src/src/main/java/net/micode/notes/ui/activities/NotesPreferenceActivity.java
+++ b/src/src/main/java/net/micode/notes/ui/activities/NotesPreferenceActivity.java
@@ -43,7 +43,6 @@ import android.widget.Toast;
 import net.micode.notes.R;
 import net.micode.notes.data.Notes;
 import net.micode.notes.data.Notes.NoteColumns;
-import net.micode.notes.gtask.remote.GTaskSyncService;
 
 
 public class NotesPreferenceActivity extends PreferenceActivity {
@@ -78,7 +77,6 @@ public class NotesPreferenceActivity extends PreferenceActivity {
         mAccountCategory = (PreferenceCategory) findPreference(PREFERENCE_SYNC_ACCOUNT_KEY);
         mReceiver = new GTaskReceiver();
         IntentFilter filter = new IntentFilter();
-        filter.addAction(GTaskSyncService.GTASK_SERVICE_BROADCAST_NAME);
         registerReceiver(mReceiver, filter);
 
         mOriAccounts = null;
@@ -131,7 +129,7 @@ public class NotesPreferenceActivity extends PreferenceActivity {
         accountPref.setSummary(getString(R.string.preferences_account_summary));
         accountPref.setOnPreferenceClickListener(new OnPreferenceClickListener() {
             public boolean onPreferenceClick(Preference preference) {
-                if (!GTaskSyncService.isSyncing()) {
+                if (false) {
                     if (TextUtils.isEmpty(defaultAccount)) {
                         // the first time to set account
                         showSelectAccountAlertDialog();
@@ -157,26 +155,23 @@ public class NotesPreferenceActivity extends PreferenceActivity {
         TextView lastSyncTimeView = (TextView) findViewById(R.id.prefenerece_sync_status_textview);
 
         // set button state
-        if (GTaskSyncService.isSyncing()) {
+        if (false) {
             syncButton.setText(getString(R.string.preferences_button_sync_cancel));
             syncButton.setOnClickListener(new View.OnClickListener() {
                 public void onClick(View v) {
-                    GTaskSyncService.cancelSync(NotesPreferenceActivity.this);
                 }
             });
         } else {
             syncButton.setText(getString(R.string.preferences_button_sync_immediately));
             syncButton.setOnClickListener(new View.OnClickListener() {
                 public void onClick(View v) {
-                    GTaskSyncService.startSync(NotesPreferenceActivity.this);
                 }
             });
         }
         syncButton.setEnabled(!TextUtils.isEmpty(getSyncAccountName(this)));
 
         // set last sync time
-        if (GTaskSyncService.isSyncing()) {
-            lastSyncTimeView.setText(GTaskSyncService.getProgressString());
+        if (false) {
             lastSyncTimeView.setVisibility(View.VISIBLE);
         } else {
             long lastSyncTime = getLastSyncTime(this);
@@ -363,11 +358,6 @@ public class NotesPreferenceActivity extends PreferenceActivity {
         @Override
         public void onReceive(Context context, Intent intent) {
             refreshUI();
-            if (intent.getBooleanExtra(GTaskSyncService.GTASK_SERVICE_BROADCAST_IS_SYNCING, false)) {
-                TextView syncStatus = (TextView) findViewById(R.id.prefenerece_sync_status_textview);
-                syncStatus.setText(intent
-                        .getStringExtra(GTaskSyncService.GTASK_SERVICE_BROADCAST_PROGRESS_MSG));
-            }
 
         }
     }