How to get the SeekBar to display properly?

Question

Java

I am writing a simple application for smoothly changing the backlight level of the screen (actually analogous to what is in the settings). SeekBar on the Api 22 screen is displayed strangely: the slider is located separately,
.
And when you start on a real device, the message "App is abnormal abou to quit" appears, but the program works stably, and on Genymotion it crashes when you try to change the brightness.
Here are the sources:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout  xmlns:android="http://schemas.android.com/apk/res/android"
    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"
    tools:context=".MainActivity"
    android:orientation="vertical">
    
    <TextView
        android:id="@+id/textView"
        android:layout_width="match_parent"
        android:layout_height="10dp"
        android:layout_weight="5"
        android:textSize="40sp"
        android:text="Яркость:" />

    <SeekBar
        android:id="@+id/seekBar"
        android:layout_width="match_parent"
        android:layout_height="100dp"
        android:layout_weight="5"
        android:min="15"
        android:max="200"
        android:progress="3"
        />
</LinearLayout>

package com.example.backlight;

import android.provider.Settings;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.SeekBar;
import android.widget.TextView;
import java.lang.String;
import java.text.BreakIterator;

public class MainActivity extends AppCompatActivity implements SeekBar.OnSeekBarChangeListener{
    private TextView textView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        final SeekBar seekBar = (SeekBar)findViewById(R.id.seekBar);
        seekBar.setOnSeekBarChangeListener(this);
        textView = (TextView)findViewById(R.id.textView);
        textView.setText("Яркость: " + Settings.System.getString(this.getContentResolver(),"screen_brightness"));

        seekBar.setProgress(Integer.parseInt(Settings.System.getString(this.getContentResolver(),"screen_brightness")));
    }

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

    }

    @Override
    public void onStartTrackingTouch(SeekBar seekBar) {

    }

    @Override
    public void onStopTrackingTouch(SeekBar seekBar) {
        android.provider.Settings.System.putInt(getContentResolver(),
                android.provider.Settings.System.SCREEN_BRIGHTNESS, seekBar.getProgress());

       textView.setText(String.valueOf(seekBar.getProgress()));
    }
}