SeekBar 滚动条

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_pressed="true"
        android:state_window_focused="true"
        android:drawable="@drawable/select"/>

    <item android:state_focused="true"
        android:state_window_focused="true"
        android:drawable="@drawable/select"/>

    <item android:state_selected="true"
        android:state_window_focused="true"
        android:drawable="@drawable/select"/>

    <item android:drawable="@drawable/normal"/>
</selector>

public class MainActivity extends AppCompatActivity implements SeekBar.OnSeekBarChangeListener{
    private SeekBar seekBar;
    private TextView text1;
    private TextView text2;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        seekBar = (SeekBar) findViewById(R.id.seekbar);
        seekBar.setOnSeekBarChangeListener(this);
        text1 = (TextView) findViewById(R.id.txt1);
        text2 = (TextView) findViewById(R.id.txt2);

    }

    //数值改变
    @Override
    public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
        text1.setText("正在拖动");
        text2.setText("当前数值"+ progress);
    }

    //开始拖动
    @Override
    public void onStartTrackingTouch(SeekBar seekBar) {
        text1.setText("开始拖动");

    }

    //停止拖动
    @Override
    public void onStopTrackingTouch(SeekBar seekBar) {
        text1.setText("停止拖动");
    }

<RelativeLayout 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"
    tools:context=".MainActivity">

    <SeekBar
        android:thumb="@drawable/my_thumb"
        android:id="@+id/seekbar"
        android:max="100"
        android:progress="50"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

    <TextView
        android:layout_below="@id/seekbar"
        android:id="@+id/txt1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
    <TextView
        android:layout_below="@id/txt1"
        android:id="@+id/txt2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />


</RelativeLayout>