片段$ InstantiationException：嘗試實例化一個不是片段的類

我有一個活動包含一個片段並且工作完美，但是當我切換到支持來自v4支持庫的片段時，突然開始拋出以下錯誤，並且我無法弄清楚爲什麼。

java.lang.RuntimeException: Unable to start activity ComponentInfo{RecordActivity}: android.view.InflateException: Binary XML file line #6: Error inflating class fragment 
      at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2198) 
      at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2257) 
      at android.app.ActivityThread.access$800(ActivityThread.java:139) 
      at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1210) 
      at android.os.Handler.dispatchMessage(Handler.java:102) 
      at android.os.Looper.loop(Looper.java:136) 
      at android.app.ActivityThread.main(ActivityThread.java:5086) 
      at java.lang.reflect.Method.invokeNative(Native Method) 
      at java.lang.reflect.Method.invoke(Method.java:515) 
      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785) 
      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601) 
      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:713) 
      at android.view.LayoutInflater.rInflate(LayoutInflater.java:755) 
      at android.view.LayoutInflater.inflate(LayoutInflater.java:492) 
      at android.view.LayoutInflater.inflate(LayoutInflater.java:397) 
      at android.view.LayoutInflater.inflate(LayoutInflater.java:353) 
      at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:290) 
      at android.app.Activity.setContentView(Activity.java:1937)     
      at android.app.Activity.performCreate(Activity.java:5248) 
      at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1110) 
      at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2162) 
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2257) 
            at android.app.ActivityThread.access$800(ActivityThread.java:139) 
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1210) 
            at android.os.Handler.dispatchMessage(Handler.java:102) 
            at android.os.Looper.loop(Looper.java:136) 
            at android.app.ActivityThread.main(ActivityThread.java:5086) 
            at java.lang.reflect.Method.invokeNative(Native Method) 
            at java.lang.reflect.Method.invoke(Method.java:515) 
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785) 
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601) 
            at dalvik.system.NativeStart.main(Native Method) 
    Caused by: android.app.Fragment$InstantiationException: Trying to instantiate a class RecordFragment that is not a Fragment 
      at android.app.Fragment.instantiate(Fragment.java:585) 
      at android.app.Fragment.instantiate(Fragment.java:561) 
      at android.app.Activity.onCreateView(Activity.java:4795) 
      at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:689) 
            at android.view.LayoutInflater.rInflate(LayoutInflater.java:755) 
            at android.view.LayoutInflater.inflate(LayoutInflater.java:492) 
            at android.view.LayoutInflater.inflate(LayoutInflater.java:397) 
            at android.view.LayoutInflater.inflate(LayoutInflater.java:353) 
            at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:290) 
            at android.app.Activity.setContentView(Activity.java:1937) 
            at android.app.Activity.performCreate(Activity.java:5248) 
            at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1110) 
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2162) 
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2257) 
            at android.app.ActivityThread.access$800(ActivityThread.java:139) 
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1210) 
            at android.os.Handler.dispatchMessage(Handler.java:102) 
            at android.os.Looper.loop(Looper.java:136) 
            at android.app.ActivityThread.main(ActivityThread.java:5086) 
            at java.lang.reflect.Method.invokeNative(Native Method) 
            at java.lang.reflect.Method.invoke(Method.java:515) 
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785) 
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601) 
            at dalvik.system.NativeStart.main(Native Method) 
    Caused by: java.lang.ClassCastException 
            at android.app.Fragment.instantiate(Fragment.java:585) 
            at android.app.Fragment.instantiate(Fragment.java:561) 
            at android.app.Activity.onCreateView(Activity.java:4795) 
            at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:689) 
            at android.view.LayoutInflater.rInflate(LayoutInflater.java:755) 
            at android.view.LayoutInflater.inflate(LayoutInflater.java:492) 
            at android.view.LayoutInflater.inflate(LayoutInflater.java:397) 
            at android.view.LayoutInflater.inflate(LayoutInflater.java:353) 
            at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:290) 
            at android.app.Activity.setContentView(Activity.java:1937) 
            at RecordActivity.onCreate(RecordActivity.java:22) 
            at android.app.Activity.performCreate(Activity.java:5248) 
            at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1110) 
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2162) 
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2257) 
            at android.app.ActivityThread.access$800(ActivityThread.java:139) 
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1210) 
            at android.os.Handler.dispatchMessage(Handler.java:102) 
            at android.os.Looper.loop(Looper.java:136) 
            at android.app.ActivityThread.main(ActivityThread.java:5086) 
            at java.lang.reflect.Method.invokeNative(Native Method) 
            at java.lang.reflect.Method.invoke(Method.java:515) 
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785) 
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601) 
            at dalvik.system.NativeStart.main(Native Method)

RecordActivity

package com.example.android; 

import android.content.Intent; 
import android.os.Bundle; 
import android.support.v4.app.FragmentActivity; 
import android.view.MenuItem; 
import android.view.View; 

public class RecordActivity extends FragmentActivity 
{ 
    private RecordFragment fragment; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) 
    { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.fragment_container); 
     if (getActionBar() != null) 
      getActionBar().hide(); 

     fragment = (RecordFragment) getSupportFragmentManager().findFragmentById(R.id.main_fragment); 
     fragment.setReplyText(getIntent().getExtras()); 
    } 
}

RecordFragment

import android.app.Activity; 
import android.content.Context; 
import android.content.Intent; 
import android.content.SharedPreferences; 
import android.os.AsyncTask; 
import android.os.Bundle; 
import android.os.Environment; 
import android.support.v4.app.Fragment;  
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.view.ViewStub; 

public class RecordFragment extends Fragment 
{ 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) 
    { 
     spf = getActivity().getSharedPreferences(STUDIO_SHARED_PREFERENCES, Context.MODE_PRIVATE); 
     View rootView = inflater.inflate(R.layout.activity_record, container, false); 
     ViewStub stub = (ViewStub) rootView.findViewById(R.id.tsmessage); 
     stub.setLayoutResource(R.layout.ts_message); 
     //more code ... 
}

fragment_container.xml

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

    <fragment 
     android:name="com.example.android.Fragments.RecordFragment" 
     android:id="@+id/main_fragment" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" /> 

</RelativeLayout>

我已經回顧了類似的問題，但沒有一個我見過的似乎適合我的問題。該活動繼承自FragmentActivity而不是Activity，如其他問題中所建議的。

我感謝你在你的幫助

來源

2015-08-28 cbaspree

難道在你的XML包名是不是有效？ android：name =「com.example.android.RecordFragment」可能是正確的值？ – Christopher

嗨，我只更改了包的名稱以簡化代碼 – cbaspree

如果您可以使用support-v7庫，請嘗試使用「AppCompatActivity」而不是「FragmentActivity」。很明顯，它試圖將片段實例化爲一個'android.app.Fragment'類型片段，但我不明白爲什麼它應該這樣做。 – EpicPandaForce

嘗試用android.support.v4.app.Fragment而不是Fragment在XML文件中，有時Android的充氣時混淆Android.app.Fragment與android.support.v4.app.Fragment。

來源

2015-08-31 14:54:34 arodriguezdonaire

從imports在RecordFragment它看起來像RecordFragment正在延伸android.support.v4.app.Fragment。充氣期待一個android.app.Fragment

來源

2016-05-09 08:41:43 unicorn2

與您MainActivity.java Android.app.Fragment進口或在其他Java類而不是android.support.v4.app.Fragment進口嘗試

有時混淆的Android安卓與android.app.Fragment

.support.v4.app.Fragment

它應該工作，

來源

2017-06-09 19:47:14

片段$ InstantiationException：嘗試實例化一個不是片段的類

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