引起：android.app.Fragment $ InstantiationException：无法实例化片段com.example.fragreva.FragA

时间：2014-11-03 03:19:50

标签： android eclipse android-fragments android-support-library

我正在学习如何使用片段..我遇到了这个错误，并且无法纠正它...尝试了很多组合..我尝试在网上搜索这个...可以＆ ＃39;解决它仍然.. ..

当我复制这个完整的项目时，在我的旧项目中使用片段..它完全正常，没有任何错误.. 我认为支持库有一些错误，所以我删除并再次添加了库，这在WORKING PROJECT中没有任何问题但是没有成功.. 感谢。

11-03 08:22:47.336: E/AndroidRuntime(1608): FATAL EXCEPTION: main
11-03 08:22:47.336: E/AndroidRuntime(1608): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.fragrevb/com.example.fragrevb.MainActivity}: android.view.InflateException: Binary XML file line #12: Error inflating class fragment
11-03 08:22:47.336: E/AndroidRuntime(1608):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1955)
11-03 08:22:47.336: E/AndroidRuntime(1608):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1980)
11-03 08:22:47.336: E/AndroidRuntime(1608):     at android.app.ActivityThread.access$600(ActivityThread.java:122)
11-03 08:22:47.336: E/AndroidRuntime(1608):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1146)
11-03 08:22:47.336: E/AndroidRuntime(1608):     at android.os.Handler.dispatchMessage(Handler.java:99)
11-03 08:22:47.336: E/AndroidRuntime(1608):     at android.os.Looper.loop(Looper.java:137)
11-03 08:22:47.336: E/AndroidRuntime(1608):     at android.app.ActivityThread.main(ActivityThread.java:4340)
11-03 08:22:47.336: E/AndroidRuntime(1608):     at java.lang.reflect.Method.invokeNative(Native Method)
11-03 08:22:47.336: E/AndroidRuntime(1608):     at java.lang.reflect.Method.invoke(Method.java:511)
11-03 08:22:47.336: E/AndroidRuntime(1608):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
11-03 08:22:47.336: E/AndroidRuntime(1608):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
11-03 08:22:47.336: E/AndroidRuntime(1608):     at dalvik.system.NativeStart.main(Native Method)
11-03 08:22:47.336: E/AndroidRuntime(1608): Caused by: android.view.InflateException: Binary XML file line #12: Error inflating class fragment
11-03 08:22:47.336: E/AndroidRuntime(1608):     at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:697)
11-03 08:22:47.336: E/AndroidRuntime(1608):     at android.view.LayoutInflater.rInflate(LayoutInflater.java:739)
11-03 08:22:47.336: E/AndroidRuntime(1608):     at android.view.LayoutInflater.inflate(LayoutInflater.java:489)
11-03 08:22:47.336: E/AndroidRuntime(1608):     at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
11-03 08:22:47.336: E/AndroidRuntime(1608):     at android.view.LayoutInflater.inflate(LayoutInflater.java:352)
11-03 08:22:47.336: E/AndroidRuntime(1608):     at android.support.v7.app.ActionBarActivityDelegateBase.setContentView(ActionBarActivityDelegateBase.java:228)
11-03 08:22:47.336: E/AndroidRuntime(1608):     at android.support.v7.app.ActionBarActivity.setContentView(ActionBarActivity.java:102)
11-03 08:22:47.336: E/AndroidRuntime(1608):     at com.example.fragrevb.MainActivity.onCreate(MainActivity.java:15)
11-03 08:22:47.336: E/AndroidRuntime(1608):     at android.app.Activity.performCreate(Activity.java:4465)
11-03 08:22:47.336: E/AndroidRuntime(1608):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
11-03 08:22:47.336: E/AndroidRuntime(1608):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1919)
11-03 08:22:47.336: E/AndroidRuntime(1608):     ... 11 more
11-03 08:22:47.336: E/AndroidRuntime(1608): Caused by: android.app.Fragment$InstantiationException: Unable to instantiate fragment com.example.fragreva.FragA: make sure class name exists, is public, and has an empty constructor that is public
11-03 08:22:47.336: E/AndroidRuntime(1608):     at android.app.Fragment.instantiate(Fragment.java:572)
11-03 08:22:47.336: E/AndroidRuntime(1608):     at android.app.Fragment.instantiate(Fragment.java:540)
11-03 08:22:47.336: E/AndroidRuntime(1608):     at android.app.Activity.onCreateView(Activity.java:4235)
11-03 08:22:47.336: E/AndroidRuntime(1608):     at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:673)
11-03 08:22:47.336: E/AndroidRuntime(1608):     ... 21 more
11-03 08:22:47.336: E/AndroidRuntime(1608): Caused by: java.lang.ClassNotFoundException: com.example.fragreva.FragA
11-03 08:22:47.336: E/AndroidRuntime(1608):     at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:61)
11-03 08:22:47.336: E/AndroidRuntime(1608):     at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
11-03 08:22:47.336: E/AndroidRuntime(1608):     at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
11-03 08:22:47.336: E/AndroidRuntime(1608):     at android.app.Fragment.instantiate(Fragment.java:562)
11-03 08:22:47.336: E/AndroidRuntime(1608):     ... 24 more



<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.fragrevb.MainActivity" 
android:background="#00BBFF">

<fragment
    android:id="@+id/fragment1"
    android:name="com.example.fragrevb.FragA"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentLeft="true"
    android:layout_alignParentTop="true" />

<fragment
    android:id="@+id/fragment2"
    android:name="com.example.fragrevb.FragB"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_alignLeft="@+id/fragment1"
    android:layout_below="@+id/fragment1"
    android:layout_marginTop="38dp" />

这是代码..我已经纠正了错误。这是我的坏事。 在activity_main.xml中添加片段时，我已经在另一个项目中创建了2个具有相同名称的片段。所以我在这个活动（当前项目）中添加了这些片段（来自其他项目）..之前， android：name =＆＃34; com.example.fragreva.FragB＆＃34; 和 android：name =＆＃34; com.example.fragreva.FragA＆＃34; （这是错的）..我把它改为 android：name =＆＃34; com.example.fragrevb.FragB＆＃34; 和 android：name =＆＃34; com .example.fragrevb.FragA＆＃34; ..因为错误..课程倾斜。谢谢大家试图帮忙！欢呼声。

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