android - 尝试在 App 中使用蓝牙，出现错误

Question

我收到此错误：

 Exception raised during rendering: com.android.layoutlib.bridge.MockView cannot be cast to android.view.ViewGroup
 Exception details are logged in Window > Show View > Error Log
 The following classes could not be found:

 - application (Fix Build Path, Edit XML)
 - manifest (Fix Build Path, Edit XML)

这是我的代码：

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

    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_height="wrap_content"
    android:layout_width="wrap_content">

    <application >
      <uses-library android:name="com.google.android.maps" />
    </application>
    <uses-permission android:name="android.permission.BLUETOOTH" />
  < /manifest>

Answer 1

我认为问题出在布局下方。

  android:layout_height="wrap_content"
    android:layout_width="wrap_content"