Nsryjdtyk

I have a setting layout to change my appearance app.
I want to put a SeekBar to change all of text size in my app.
But I don't know what to do to get it done.
I would appreciate if you guide me.

Try this

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:gravity="center"

android:orientation="vertical"

tools:context=".MainActivity">



<TextView

    android:id="@+id/textView"

    android:layout_width="wrap_content"

    android:layout_height="wrap_content"

    android:textSize="14sp"

    android:text="Text" />



<SeekBar

    android:id="@+id/seekBar"

    android:layout_width="match_parent"

    android:layout_height="wrap_content"

    android:layout_marginLeft="20dp"

    android:layout_marginRight="20dp" />



</LinearLayout>

onCreateMethod of MainActivity class:

@Override

protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_main);





    final TextView textView = findViewById(R.id.textView);

    SeekBar seekBar = findViewById(R.id.seekBar);





    seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {



        @Override

        public void onStopTrackingTouch(SeekBar seekBar) {

        }



        @Override

        public void onStartTrackingTouch(SeekBar seekBar) {

        }



        @Override

        public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {

            textView.setTextSize(progress);



        }

    });

}

Try to modify this code as your preference.