错误：（3）解析XML时出错：未绑定的前缀

Question

我在制作一个应用程序，我想使用CardView。

我下载的开源项目，并根据我的需要应用更改，但我得到的错误：

Error:(3) Error parsing XML: unbound prefix 

Error:Execution failed for task ':app:processDebugResources'. 
com.android.ide.common.process.ProcessException: org.gradle.process.internal.ExecException: Process 'command 'C:\Users\Andrew\AppData\Local\Android\sdk\build-tools\21.1.2\aapt.exe'' finished with non-zero exit value 1 

这里是我的xml：

<LinearLayout 
xmlns:iosched="http://schemas.android.com/apk/res-auto" 

xmlns:tools="http://schemas.android.com/tools" 


android:orientation="vertical" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
tools:context=".ui.MainActivity" 
android:id="@+id/"> 

<FrameLayout 
    android:layout_width="match_parent" 
    android:layout_height="0dp" 
    android:layout_weight="1" 
    android:background="#e5e5e5"> 

    <!--<ImageView--> 
     <!--android:src="@drawable/io2014_logo"--> 
     <!--android:layout_width="200dp"--> 
     <!--android:layout_height="100dp"--> 
     <!--android:scaleType="fitCenter"--> 
     <!--android:tint="#7000"--> 
     <!--android:layout_gravity="center|top" />--> 

    <ScrollView 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:fillViewport="false" 
     android:id="@+id/"> 

     <FrameLayout 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:paddingBottom="16dp" 
      android:paddingLeft="16dp" 
      android:paddingRight="16dp" 
      android:paddingTop="100dp" 
      android:clipToPadding="false"> 

      <com.example.ahsankhan.smsburst.test 
       android:layout_width="match_parent" 
       android:layout_height="wrap_content" 
       iosched:cardBackgroundColor="#fff" 
       iosched:cardCornerRadius="@dimen/card_corner_radius" 
       iosched:cardElevation="@dimen/card_elevation" 
       iosched:cardPreventCornerOverlap="false"> 

       <LinearLayout 
        android:layout_width="match_parent" 
        android:layout_height="match_parent" 
        android:orientation="vertical" 
        android:padding="24dp"> 

        <TextView 
         android:layout_width="wrap_content" 
         android:layout_height="wrap_content" 

         android:fontFamily="@string/font_fontFamily_medium" 
         android:text="@string/welcome_to_google_i_o_app" 
         android:textColor="@color/theme_primary" 
         android:textSize="@dimen/text_size_xlarge" 
         android:textStyle="@integer/font_textStyle_medium" 
         android:id="@+id/" /> 

        <TextView 
         android:layout_width="match_parent" 
         android:layout_height="wrap_content" 
         android:layout_marginTop="16dp" 
         android:autoLink="web" 
         android:text="@string/welcome_text" 
         android:textColor="@color/body_text_2" 
         android:textSize="@dimen/text_size_medium" /> 

        <TextView 
         android:layout_width="match_parent" 
         android:layout_height="wrap_content" 
         android:layout_marginTop="16dp" 
         android:autoLink="web" 
         android:text="@string/eula_legal_text" 
         android:textColor="@color/body_text_2" 
         android:textSize="@dimen/text_size_medium" /> 

       </LinearLayout> 
      </com.example.ahsankhan.smsburst.test> 
     </FrameLayout> 
    </ScrollView> 

</FrameLayout> 

<!-- Button bar --> 
<LinearLayout 
    android:layout_height="48dp" 
    android:background="@color/theme_primary" 
    android:layout_gravity="bottom" 
    android:layout_width="match_parent"> 

    <Button 
     android:layout_width="0dp" 
     android:layout_weight="1" 
     android:layout_height="match_parent" 
     android:background="?photoItemForeground" 
     android:text="@string/decline" 
     android:textColor="#8fff" 
     android:textSize="@dimen/text_size_medium" 
     android:textStyle="@integer/font_textStyle_medium" 
     android:fontFamily="@string/font_fontFamily_medium" 
     android:textAllCaps="true" 
     android:id="@+id/button_decline" /> 

    <Button 
     android:id="@+id/button_accept" 
     android:layout_width="0dp" 
     android:layout_weight="1" 
     android:layout_height="match_parent" 
     android:background="?photoItemForeground" 
     android:text="@string/accept" 
     android:textSize="@dimen/text_size_medium" 
     android:textStyle="@integer/font_textStyle_medium" 
     android:fontFamily="@string/font_fontFamily_medium" 
     android:textAllCaps="true" 
     android:textColor="#fff" /> 

</LinearLayout> 
</LinearLayout> 

这里是我的build.gradle文件：

apply plugin: 'com.android.application' 

android { 
compileSdkVersion 21 
buildToolsVersion "21.1.2" 

defaultConfig { 
    applicationId "com.example.ahsankhan.smsburst" 
    minSdkVersion 9 
    targetSdkVersion 21 
    versionCode 1 
    versionName "1.0" 
} 
buildTypes { 
    release { 
     minifyEnabled false 
proguardFiles getDefaultProguardFile('proguard-android.txt'), 
file('proguard-project.txt') 
    } 
} 
} 

dependencies { 
compile fileTree(dir: 'libs', include: ['*.jar']) 
compile 'com.android.support:appcompat-v7:21.0.3' 
} 

Answer 1

您需要在您的父级布局中添加android xmlns属性，如：

<LinearLayout 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:iosched="http://schemas.android.com/apk/res-auto" 
    xmlns:tools="http://schemas.android.com/tools" 
    ...