Fragment使用的时候必须要设置id吗

_XuDaojie 2015-06-01 02:49:12
Activity

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">

<fragment
android:id="@+id/fragment1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:name="com.example.daojie.sample.fragment.LifeCycleFragment">
</fragment>

</LinearLayout>

Fragment

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="match_parent"
android:background="#00FF00">

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Fragment"/>
</LinearLayout>

很奇怪 当我给<fragment/>加上id的时候运行正常,但是当我去除的时候就会报 InflateException
这个原理到底是什么 为什么fragment必须要加上id才行
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_XuDaojie 2015-06-01
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引用 3 楼 qq115787813 的回复:
Caused by: java.lang.IllegalArgumentException: Binary XML file line #6: Must specify unique android:id, android:tag, or have a parent with an id for com.example.daojie.sample.fragment.LifeCycleFragment 这句话意思就是是说你这个必须要有ID或者tag,或者要有一个有ID的父容器吧。
OK 谢了
栀暖莺飞 2015-06-01
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Caused by: java.lang.IllegalArgumentException: Binary XML file line #6: Must specify unique android:id, android:tag, or have a parent with an id for com.example.daojie.sample.fragment.LifeCycleFragment

这句话意思就是是说你这个必须要有ID或者tag,或者要有一个有ID的父容器吧。
_XuDaojie 2015-06-01
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引用 1 楼 qq115787813 的回复:
你把异常log贴出来看看
06-01 07:19:18.467  20298-20298/com.example.daojie.sample E/AndroidRuntime﹕ FATAL EXCEPTION: main
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.daojie.sample/com.example.daojie.sample.fragment.LifeCycleActivity}: android.view.InflateException: Binary XML file line #6: Error inflating class fragment
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
            at android.app.ActivityThread.access$600(ActivityThread.java:141)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
            at android.os.Handler.dispatchMessage(Handler.java:99)
            at android.os.Looper.loop(Looper.java:137)
            at android.app.ActivityThread.main(ActivityThread.java:5039)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:511)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
            at dalvik.system.NativeStart.main(Native Method)
     Caused by: android.view.InflateException: Binary XML file line #6: Error inflating class fragment
            at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:704)
            at android.view.LayoutInflater.rInflate(LayoutInflater.java:746)
            at android.view.LayoutInflater.inflate(LayoutInflater.java:489)
            at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
            at android.view.LayoutInflater.inflate(LayoutInflater.java:352)
            at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:270)
            at android.app.Activity.setContentView(Activity.java:1881)
            at com.example.daojie.sample.fragment.LifeCycleActivity.onCreate(LifeCycleActivity.java:15)
            at android.app.Activity.performCreate(Activity.java:5104)
            at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
            at android.app.ActivityThread.access$600(ActivityThread.java:141)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
            at android.os.Handler.dispatchMessage(Handler.java:99)
            at android.os.Looper.loop(Looper.java:137)
            at android.app.ActivityThread.main(ActivityThread.java:5039)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:511)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
            at dalvik.system.NativeStart.main(Native Method)
     Caused by: java.lang.IllegalArgumentException: Binary XML file line #6: Must specify unique android:id, android:tag, or have a parent with an id for com.example.daojie.sample.fragment.LifeCycleFragment
            at android.app.Activity.onCreateView(Activity.java:4690)
            at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:680)
            at android.view.LayoutInflater.rInflate(LayoutInflater.java:746)
            at android.view.LayoutInflater.inflate(LayoutInflater.java:489)
            at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
            at android.view.LayoutInflater.inflate(LayoutInflater.java:352)
            at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:270)
            at android.app.Activity.setContentView(Activity.java:1881)
            at com.example.daojie.sample.fragment.LifeCycleActivity.onCreate(LifeCycleActivity.java:15)
            at android.app.Activity.performCreate(Activity.java:5104)
            at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
            at android.app.ActivityThread.access$600(ActivityThread.java:141)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
            at android.os.Handler.dispatchMessage(Handler.java:99)
            at android.os.Looper.loop(Looper.java:137)
            at android.app.ActivityThread.main(ActivityThread.java:5039)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:511)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
            at dalvik.system.NativeStart.main(Native Method)
栀暖莺飞 2015-06-01
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你把异常log贴出来看看

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