android - Starting activity from fragment button click (intent) throws blank screen -

i'm trying start activity button placed in fragment, when run app (in emulator , in real device) , press button, activity doesn't start , blank screen whithout navigation bar appears. i've read lot this, , common error people had didn't declare activity or weren't inflating correct layout. idea appreciated, because don't right now.

here code of manifest:

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.isa.example" >  <application     android:allowbackup="true"     android:icon="@mipmap/ic_launcher"     android:label="@string/app_name"     android:theme="@style/apptheme" >     <activity         android:name=".mainactivity"         android:label="@string/app_name"         android:screenorientation="portrait"         android:theme="@style/theme.custommaterial" >         <intent-filter>             <action android:name="android.intent.action.main" />              <category android:name="android.intent.category.launcher" />         </intent-filter>     </activity>     <activity         android:name=".newactivity"         android:label="@string/app_name"         android:screenorientation="portrait"         android:theme="@style/theme.custommaterial" >         <intent-filter>             <action android:name="com.isa.example.newactivity" />              <category android:name="android.intent.category.launcher" />         </intent-filter>     </activity> </application>  </manifest> 

here code fragment layout:

<relativelayout 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" android:id="@+id/container" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" tools:context=".mainactivity">  <button     android:id="@+id/button"     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:text="start new activity"/>  </relativelayout> 

code fragment:

public class fragment1 extends fragment {  @override public void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     } }  @override public view oncreateview(layoutinflater inflater, viewgroup container,                          bundle savedinstancestate) {      view view = inflater.inflate(r.layout.fragment_fragment1, container, false);      button button = (button) view.findviewbyid(r.id.button);     button.setonclicklistener(new view.onclicklistener() {         @override         public void onclick(view v) {             intent = new intent(getactivity(), newactivity.class);             startactivity(i);         }     });      return view;     } } 

code new activity layout:

<?xml version="1.0" encoding="utf-8"?> <linearlayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent">  <textview     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:textappearance="?android:attr/textappearancelarge"     android:text="this new activity"     android:id="@+id/textview"     android:layout_gravity="center_horizontal" /> </linearlayout> 

and code new activity:

public class newactivity extends activity{  @override public void oncreate(bundle savedinstancestate, persistablebundle persistentstate) {     super.oncreate(savedinstancestate, persistentstate);     setcontentview(r.layout.newactivity_layout);     } } 

what minimum sdk version? version of oncreate introduced in 21: stackoverflow.com/a/29871359/1541763 remove persistablebundle persistentstate parameters