片段$ InstantiationException：尝试实例化不是片段的类

时间：2015-08-28 16:55:01

标签： java android android-fragments android-support-library

我有一个包含片段的活动并且工作得很好，但当我从v4支持库切换到支持片段时，突然开始抛出以下错误，我无法弄清楚原因。

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>

我已经回顾了类似的问题，但我见过的所有问题似乎都不符合我的问题。该活动继承自FragmentActivity而非Activity，如另一个问题所示。

我提前感谢您的帮助

3 个答案:

答案 0 :(得分：3)

imports RecordFragment RecordFragment看起来android.support.v4.app.Fragment正在展开android.app.Fragment。 inflater期待"File_" + TalendDate.getDate("CCYY-MM-DD hh:mm:ss") + ".txt"

答案 1 :(得分：1)

在您的XML文件中尝试使用android.support.v4.app.Fragment代替Fragment，有时在充气时，Android会将Android.app.Fragment与android.support.v4.app.Fragment混淆。

答案 2 :(得分：0)

试试 在MainActivity.java或其他java类中导入Android.app.Fragment 而不是android.support.v4.app.Fragment import

有时Android会混淆  android.app.Fragment与android.app.Fragment

一起使用android.support.v4.app.Fragment

它应该有用，

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