Android Wear 开发中遇到的 CardFrame can host only one direct child

Caused by: java.lang.IllegalStateException: CardFrame can host only one direct child

02-29 23:57:35.233 20551-20551/tech.androidstudio.cardframedemoseconde E/AndroidRuntime: at android.support.wearable.view.CardFrame.addView(CardFrame.java:527)

02-29 23:57:35.233 20551-20551/tech.androidstudio.cardframedemoseconde E/AndroidRuntime: at android.view.LayoutInflater.rInflate(LayoutInflater.java:810)

02-29 23:57:35.233 20551-20551/tech.androidstudio.cardframedemoseconde E/AndroidRuntime: at android.view.LayoutInflater.rInflate(LayoutInflater.java:809)

02-29 23:57:35.233 20551-20551/tech.androidstudio.cardframedemoseconde E/AndroidRuntime: at android.view.LayoutInflater.rInflate(LayoutInflater.java:809)

02-29 23:57:35.233 20551-20551/tech.androidstudio.cardframedemoseconde E/AndroidRuntime: at android.view.LayoutInflater.inflate(LayoutInflater.java:504)

02-29 23:57:35.233 20551-20551/tech.androidstudio.cardframedemoseconde E/AndroidRuntime: at android.view.LayoutInflater.inflate(LayoutInflater.java:414)

02-29 23:57:35.233 20551-20551/tech.androidstudio.cardframedemoseconde E/AndroidRuntime: at android.view.LayoutInflater.inflate(LayoutInflater.java:365)

02-29 23:57:35.233 20551-20551/tech.androidstudio.cardframedemoseconde E/AndroidRuntime: at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:378)

02-29 23:57:35.233 20551-20551/tech.androidstudio.cardframedemoseconde E/AndroidRuntime: at android.app.Activity.setContentView(Activity.java:2145)

02-29 23:57:35.233 20551-20551/tech.androidstudio.cardframedemoseconde E/AndroidRuntime: at tech.androidstudio.cardframedemoseconde.MainActivity.onCreate(MainActivity.java:15)

02-29 23:57:35.233 20551-20551/tech.androidstudio.cardframedemoseconde E/AndroidRuntime: at android.app.Activity.performCreate(Activity.java:5990)

02-29 23:57:35.233 20551-20551/tech.androidstudio.cardframedemoseconde E/AndroidRuntime: at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)

02-29 23:57:35.233 20551-20551/tech.androidstudio.cardframedemoseconde E/AndroidRuntime: at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2278)

02-29 23:57:35.233 20551-20551/tech.androidstudio.cardframedemoseconde E/AndroidRuntime: at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)

02-29 23:57:35.233 20551-20551/tech.androidstudio.cardframedemoseconde E/AndroidRuntime: at android.app.ActivityThread.access$800(ActivityThread.java:151)

02-29 23:57:35.233 20551-20551/tech.androidstudio.cardframedemoseconde E/AndroidRuntime: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)

02-29 23:57:35.233 20551-20551/tech.androidstudio.cardframedemoseconde E/AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:102)

02-29 23:57:35.233 20551-20551/tech.androidstudio.cardframedemoseconde E/AndroidRuntime: at android.os.Looper.loop(Looper.java:135)

02-29 23:57:35.233 20551-20551/tech.androidstudio.cardframedemoseconde E/AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:5254)

02-29 23:57:35.233 20551-20551/tech.androidstudio.cardframedemoseconde E/AndroidRuntime: at java.lang.reflect.Method.invoke(Native Method)

02-29 23:57:35.233 20551-20551/tech.androidstudio.cardframedemoseconde E/AndroidRuntime: at java.lang.reflect.Method.invoke(Method.java:372)

02-29 23:57:35.233 20551-20551/tech.androidstudio.cardframedemoseconde E/AndroidRuntime: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)

02-29 23:57:35.233 20551-20551/tech.androidstudio.cardframedemoseconde E/AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)

原因 ：

CardFrame 只能有一个子组件 ，而我的 代码里面是两个TextView 所以错了

<android.support.wearable.view.BoxInsetLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools" android:id="@+id/watch_view_stub"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<android.support.wearable.view.CardScrollView
android:id="@+id/cardscrollview"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="bottom">
<android.support.wearable.view.CardFrame
android:layout_width="match_parent"
android:layout_height="fill_parent">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Hello World"/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Desctiption"/>

</android.support.wearable.view.CardFrame>

</android.support.wearable.view.CardScrollView>

</android.support.wearable.view.BoxInsetLayout>

解决的办法：

添加一个 LinearLayout来包裹 刚才的 两个TextView。

<android.support.wearable.view.CardFrame
android:layout_width="match_parent"
android:layout_height="fill_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Hello World"/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Desctiption"/>
</LinearLayout>

</android.support.wearable.view.CardFrame>