android.view.InflateException: Binary XML file line #29: Error inflating class <unknown> 解决方法

Caused by: android.view.InflateException: Binary XML file line #29: Error inflating class <unknown>

Caused by: java.lang.reflect.InvocationTargetException

Caused by: java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()

<Spinner
            android:id="@+id/number_type"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="2" />

Looper.prepare();