android - App crashing when setting text size dynamically -


this question has answer here:

i developing application , whenever use

text1.settextsize(10 * getresources().getdisplaymetrics().density);

to set text size in fragment, app crashes. findviewbyid() shows warning.

method invocation findviewbyid may produce java.lang.nullpointerexception

i tried suppress warning @suppresswarnings("constantconditions") , successful in doing not helping app saved crashing.
it still crashes.
here's java code:

import android.os.bundle; import android.support.annotation.nullable; import android.support.v4.app.fragment; import android.view.layoutinflater; import android.view.view; import android.view.viewgroup; import android.widget.textview;  public class metro extends fragment {      @suppresswarnings("constantconditions")     @nullable     @override     public view oncreateview(layoutinflater inflater, @nullable viewgroup container, @nullable bundle savedinstancestate) {          textview text1 = getview().findviewbyid(r.id.textview1);         text1.settext(r.string.route);         text1.settextsize(10 * getresources().getdisplaymetrics().density);         textview text2 = getview().findviewbyid(r.id.textview2);         text2.settext(r.string.map);         text2.settextsize(10 * getresources().getdisplaymetrics().density);         textview text3 = getview().findviewbyid(r.id.textview3);         text3.settext(r.string.location);         text3.settextsize(10 * getresources().getdisplaymetrics().density);         textview text4 = getview().findviewbyid(r.id.textview4);         text4.settext(r.string.about);         text4.settextsize(10 * getresources().getdisplaymetrics().density);          return inflater.inflate(r.layout.fragment_metro, container, false);     } }

and xml's code:

<?xml version="1.0" encoding="utf-8"?> <android.support.constraint.constraintlayout xmlns:app="http://schemas.android.com/apk/res-auto"     xmlns:tools="http://schemas.android.com/tools"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:orientation="vertical"     android:background="@drawable/home"     xmlns:android="http://schemas.android.com/apk/res/android" >      <android.support.constraint.constraintlayout         xmlns:android="http://schemas.android.com/apk/res/android"         xmlns:app="http://schemas.android.com/apk/res-auto"         android:orientation="vertical"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_margintop="40dp"         android:id="@+id/button1"         app:layout_constrainttop_totopof="parent"         app:layout_constraintright_toleftof="@+id/button2"         app:layout_constraintleft_toleftof="parent">          <imageview             android:id="@+id/imageview1"             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:src="@drawable/maps"             app:layout_constraintright_torightof="parent"             app:layout_constraintleft_toleftof="parent"             app:layout_constrainttop_totopof="parent"/>          <textview             android:layout_width="wrap_content"             android:layout_height="wrap_content"             app:layout_constrainttop_tobottomof="@+id/imageview1"             app:layout_constraintleft_toleftof="@+id/imageview1"             app:layout_constraintright_torightof="@+id/imageview1"             android:id="@+id/textview1"             android:text="@string/route"/>      </android.support.constraint.constraintlayout>      <android.support.constraint.constraintlayout         xmlns:android="http://schemas.android.com/apk/res/android"         xmlns:app="http://schemas.android.com/apk/res-auto"         android:orientation="vertical"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:id="@+id/button2"         app:layout_constrainttop_totopof="parent"         app:layout_constraintright_torightof="parent"         app:layout_constraintleft_torightof="@+id/button1"         android:layout_margintop="40dp">          <imageview             android:id="@+id/imageview2"             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:src="@drawable/maps"             app:layout_constraintright_torightof="parent"             app:layout_constraintleft_toleftof="parent"             app:layout_constrainttop_totopof="parent"/>          <textview             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:id="@+id/textview2"             app:layout_constrainttop_tobottomof="@+id/imageview2"             app:layout_constraintleft_toleftof="@+id/imageview2"             app:layout_constraintright_torightof="@+id/imageview2"             android:text="@string/map"/>      </android.support.constraint.constraintlayout>      <android.support.constraint.constraintlayout         xmlns:android="http://schemas.android.com/apk/res/android"         xmlns:app="http://schemas.android.com/apk/res-auto"         android:orientation="vertical"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:id="@+id/button3"         app:layout_constrainttop_tobottomof="@+id/button1"         app:layout_constraintleft_toleftof="@+id/button1"         app:layout_constraintright_torightof="@+id/button1"         android:layout_margintop="20dp">          <imageview             android:id="@+id/imageview3"             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:src="@drawable/maps"             app:layout_constraintright_torightof="parent"             app:layout_constraintleft_toleftof="parent"             app:layout_constrainttop_totopof="parent"/>          <textview             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:id="@+id/textview3"             app:layout_constrainttop_tobottomof="@+id/imageview3"             app:layout_constraintleft_toleftof="@+id/imageview3"             app:layout_constraintright_torightof="@+id/imageview3"             android:text="@string/location"/>      </android.support.constraint.constraintlayout>      <android.support.constraint.constraintlayout         xmlns:android="http://schemas.android.com/apk/res/android"         xmlns:app="http://schemas.android.com/apk/res-auto"         android:orientation="vertical"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:id="@+id/button4"         app:layout_constrainttop_tobottomof="@+id/button2"         app:layout_constraintleft_toleftof="@+id/button2"         app:layout_constraintright_torightof="@+id/button2"         android:layout_margintop="20dp">          <imageview             android:id="@+id/imageview4"             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:src="@drawable/maps"             app:layout_constraintright_torightof="parent"             app:layout_constraintleft_toleftof="parent"             app:layout_constrainttop_totopof="parent"/>          <textview             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:text="@string/about"             android:id="@+id/textview4"             app:layout_constrainttop_tobottomof="@+id/imageview4"             app:layout_constraintleft_toleftof="@+id/imageview4"             app:layout_constraintright_torightof="@+id/imageview4"/>      </android.support.constraint.constraintlayout>  </android.support.constraint.constraintlayout>

some point note :

  • without setting text or text size programmatically, works fine.
  • i have tried putting texts in oncreateview() , onviewcreated() suppresswarnings nothing worked.
  • i have tried removing android:text xml no effect.
  • i have tried run app after removing settextsize in java still crashed.
  • i have tried remove nullables java file method invocation warning still there , did't help.

what want achieve want set text size according each device.

 public class metro extends fragment { @suppresswarnings("constantconditions") @nullable @override public view oncreateview(layoutinflater inflater, @nullable viewgroup container, @nullable bundle savedinstancestate) {      view view=inflater.inflate(r.layout.fragment_metro, container, false);     textview text1 =(textview) view.findviewbyid(r.id.textview1);     text1.settext(getstring(r.string.route));     text1.settextsize(10 * getresources().getdisplaymetrics().density);     textview text2 = (textview) view.findviewbyid(r.id.textview2);     text2.settext(getstring(r.string.route));     text2.settextsize(10 * getresources().getdisplaymetrics().density);     textview text3 = (textview) view.findviewbyid(r.id.textview3);     text3.settext(getstring(.string.route));     text3.settextsize(10 * getresources().getdisplaymetrics().density);     textview text4 = (textview) view.findviewbyid(r.id.textview4);     text4.settext(getstring(r.string.route));     text4.settextsize(10 * getresources().getdisplaymetrics().density);       return view; }  @override public void onviewcreated(view view, @nullable bundle savedinstancestate) {     super.onviewcreated(view, savedinstancestate);  }

}


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