如何在Android N中获取时间选择器中的30分钟间隔

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal">

    <NumberPicker
        android:id="@+id/hour_picker"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text=":" />

    <NumberPicker
        android:id="@+id/minute_picker"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1" />
</LinearLayout>

public class MainActivity extends AppCompatActivity {

    private NumberPicker hourPicker;
    private NumberPicker minutePicker;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        hourPicker = findViewById(R.id.hour_picker);
        minutePicker = findViewById(R.id.minute_picker);

        // 设置小时选择器范围
        hourPicker.setMinValue(0);
        hourPicker.setMaxValue(23);

        // 设置分钟选择器范围和间隔
        String[] minutes = new String[60 / 30];
        for (int i = 0; i < minutes.length; i++) {
            minutes[i] = String.format("%02d", i * 30);
        }
        minutePicker.setDisplayedValues(minutes);
        minutePicker.setMinValue(0);
        minutePicker.setMaxValue(minutes.length - 1);
    }
}