Question

tools:context="com.example.alondra.p1.RegisterActivity">

tools:context="com.example.alondra.p1.RegisterActivity">

这是我的两个错误

这是它更详细地告诉我的内容

Error:(11, 61) cvc-elt.1.a: Cannot find the declaration of element 'LinearLayout'.
Error:(1, 56) s4s-elt-schema-ns: The namespace of element 'x' must be from the schema namespace, 'http://www.w3.org/2001/XMLSchema'.
Error:(1, 56) s4s-elt-invalid: Element 'x' is not a valid element in a schema document.
Error:(1, 56) schema_reference.4: Failed to read schema document 'null', because 1) could not find the document; 2) the document could not be read; 3) the root element of the document is not <xsd:schema>.

这是另一个

C:\Users\Alondra\AndroidStudioProjects\xxxxxx\app\src\main\res\layout\activity_register.xml
Error:(9, 61) cvc-elt.1.a: Cannot find the declaration of element 'LinearLayout'.
Error:(1, 56) s4s-elt-schema-ns: The namespace of element 'x' must be from the schema namespace, 'http://www.w3.org/2001/XMLSchema'.
Error:(1, 56) s4s-elt-invalid: Element 'x' is not a valid element in a schema document.
Error:(1, 56) schema_reference.4: Failed to read schema document 'null', because 1) could not find the document; 2) the document could not be read; 3) the root element of the document is not <xsd:schema>.

Answer 1

按需配置是一项孵化功能。 NDK缺少“平台”目录。如果您使用的是NDK，请验证ndk.dir是否设置为有效的NDK目录。它目前设置为C：\ Users \ Alondra \ AppData \ Local \ Android \ Sdk \ ndk-bundle。如果您不使用NDK，请取消设置ANDROID_NDK_HOME或local.properties中的NDK变量以删除此警告。

这是我从我的gradle控制台获得的错误

Answer 2

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center_horizontal"
    android:layout_marginTop="50dp"
    android:text="Positive + 1"
    android:textSize="30sp"
    android:padding="20dp"
    android:textColor="@color/Black" />

<EditText
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:inputType="textEmailAddress"
    android:maxLines="1"
    android:id="@+id/etEmail"
    android:hint="Email"
    android:textColorHint="@color/Black"
    android:layout_marginTop="20dp"
    android:layout_marginBottom="10dp"
    android:layout_marginRight="10dp"
    android:layout_marginLeft="10dp"/>

<EditText
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/etPass"
    android:inputType="textPassword"
    android:hint="Password"
    android:textColorHint="@color/Black"
    android:maxLines="1"
    android:layout_marginBottom="10dp"
    android:layout_marginRight="10dp"
    android:layout_marginLeft="10dp"/>

<Button
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/btnLogin"
    android:text="Login"
    android:layout_marginBottom="10dp"
    android:layout_marginRight="10dp"
    android:layout_marginLeft="10dp"
    android:onClick="Login" />

<Button
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/btnReg"
    android:text="Register"
    android:layout_marginBottom="10dp"
    android:layout_marginRight="10dp"
    android:layout_marginLeft="10dp"
    android:onClick="register"
    />

这是另一个

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Welcome Back"
    android:layout_gravity="center_horizontal"
    android:layout_marginLeft="10dp"
    android:layout_marginTop="10dp"
    android:textAppearance="?android:attr/textAppearanceLarge"
    android:id="@+id/tvEmail"/>

<RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal">

<Button
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/btnLogout"
    android:text="Log Out"
    android:layout_alignParentBottom="true" />

</RelativeLayout>
 </LinearLayout>

这是最后一个

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center_horizontal"
    android:layout_marginTop="50dp"
    android:text="Positive + 1"
    android:textSize="30sp"
    android:padding="20dp"
    android:textColor="@color/Black" />

<EditText
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:inputType="textEmailAddress"
    android:maxLines="1"
    android:id="@+id/etEmail"
    android:hint="Email"
    android:textColorHint="@color/Black"
    android:layout_marginTop="20dp"
    android:layout_marginBottom="10dp"
    android:layout_marginRight="10dp"
    android:layout_marginLeft="10dp"/>

<EditText
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/etPass"
    android:inputType="textPassword"
    android:hint="Password"
    android:textColorHint="@color/Black"
    android:maxLines="1"
    android:layout_marginBottom="10dp"
    android:layout_marginRight="10dp"
    android:layout_marginLeft="10dp"/>


<Button
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/btnReg"
    android:text="Register"
    android:layout_marginBottom="10dp"
    android:layout_marginRight="10dp"
    android:layout_marginLeft="10dp"
    android:onClick="register"
    />

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAppearance="?android:attr/textAppearanceMedium"
    android:text="Back to Login"
    android:id="@+id/tvLogin"
    android:textColor="@color/Black"
    android:layout_gravity="center_horizontal"
    />

工具：2 xml文件中的上下文错误

2 个答案: