使用片段:`错误夸大类片段` [英] Working With Fragments: `Error inflating class fragment`
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问题描述
我正在练习Fragments，并创建了一个测试人员来熟悉该过程.
I'm practicing with Fragments, and created a tester to get familiar with the process.
我的目标是创建一个简单的应用程序，该应用程序具有由10个字符串组成的ListView. ListView包含在MainActivity中的一个片段中.
My goal is to create a simple app that has a ListView made up of 10 strings. The ListView is contained by a fragment within the MainActivity.
但是，我遇到了一个错误...
However, I have run into an error...
FATAL EXCEPTION: main
Process: com.example.frank.listview_test, PID: 5819
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.frank.listview_test/com.example.frank.listview_test.MainActivity}: android.view.InflateException: Binary XML file line #14: Binary XML file line #14: Error inflating class fragment
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3253)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3349)
at android.app.ActivityThread.access$1100(ActivityThread.java:221)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1794)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:158)
at android.app.ActivityThread.main(ActivityThread.java:7224)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
Caused by: android.view.InflateException: Binary XML file line #14: Binary XML file line #14: Error inflating class fragment
at android.view.LayoutInflater.inflate(LayoutInflater.java:551)
at android.view.LayoutInflater.inflate(LayoutInflater.java:429)
at android.view.LayoutInflater.inflate(LayoutInflater.java:380)
at android.support.v7.app.AppCompatDelegateImplV9.setContentView(AppCompatDelegateImplV9.java:284)
at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:140)
at com.example.frank.listview_test.MainActivity.onCreate(MainActivity.java:17)
at android.app.Activity.performCreate(Activity.java:6876)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1135)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3206)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3349)
at android.app.ActivityThread.access$1100(ActivityThread.java:221)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1794)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:158)
at android.app.ActivityThread.main(ActivityThread.java:7224)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
Caused by: android.view.InflateException: Binary XML file line #14: Error inflating class fragment
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:794)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:716)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:847)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:810)
at android.view.LayoutInflater.inflate(LayoutInflater.java:527)
at android.view.LayoutInflater.inflate(LayoutInflater.java:429)
at android.view.LayoutInflater.inflate(LayoutInflater.java:380)
at android.support.v7.app.AppCompatDelegateImplV9.setContentView(AppCompatDelegateImplV9.java:284)
at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:140)
at com.example.frank.listview_test.MainActivity.onCreate(MainActivity.java:17)
at android.app.Activity.performCreate(Activity.java:6876)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1135)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3206)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3349)
at android.app.ActivityThread.access$1100(ActivityThread.java:221)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1794)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:158)
at android.app.ActivityThread.main(ActivityThread.java:7224)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ListView.setAdapter(android.widget.ListAdapter)' on a null object reference
at com.example.frank.listview_test.MainActivity$TestListFragment.onCreateView(MainActivity.java:37)
at android.app.Fragment.performCreateView(Fragment.java:2281)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:954)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1141)
at android.app.FragmentManagerImpl.addFragment(FragmentManager.java:1245)
at android.app.FragmentManagerImpl.onCreateView(FragmentManager.java:2218)
at android.app.FragmentController.onCreateView(FragmentController.java:98)
at android.app.Activity.onCreateView(Activity.java:6070)
at android.support.v4.app.BaseFragmentActivityHoneycomb.onCreateView(BaseFragmentActivityHoneycomb.java:36)
at android.support.v4.app.FragmentActivity.onCreateView(FragmentActivity.java:75)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:766)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:716)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:847)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:810)
at android.view.LayoutInflater.inflate(LayoutInflater.java:527)
at android.view.LayoutInflater.inflate(LayoutInflater.java:429)
at android.view.LayoutInflater.inflate(LayoutInflater.java:380)
at android.support.v7.app.AppCompatDelegateImplV9.setContentView(AppCompatDelegateImplV9.java:284)
at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:140)
at com.example.frank.listview_test.MainActivity.onCreate(MainActivity.java:17)
at android.app.Activity.performCreate(Activity.java:6876)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1135)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3206)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3349)
at android.app.ActivityThread.access$1100(ActivityThread.java:221)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1794)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:158)
at android.app.ActivityThread.main(ActivityThread.java:7224)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
这是我的相关代码...
Here is my relevant code...
activity_main.xml:
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:background="#FFFFFF"
android:gravity="center"
tools:context="com.example.frank.listview_test.MainActivity">
<fragment android:name="com.example.frank.listview_test.MainActivity$TestListFragment"
android:id="@+id/list"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</FrameLayout>
list_fragment.xml:
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/listFragment"
android:layout_width="match_parent" android:layout_height="match_parent">
<ListView
android:id="@+id/testListView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center" />
</FrameLayout>
list_item.xml:
<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="70dp"
android:textSize="50sp"
android:textColor="#000000"
android:layout_gravity="center"/>
MainActivity.java:
package com.example.frank.listview_test;
import android.app.Fragment;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ListView;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public static class TestListFragment extends Fragment {
private String[] myStringArray = new String[20];
private ListView listView;
private void setArray() {
for (int i = 0; i < 10; i++) {
this.myStringArray[i] = "hello";
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
setArray();
ArrayAdapter<String> adapter = new ArrayAdapter<String>(getActivity(),R.layout.list_item , myStringArray);
listView = (ListView) getActivity().findViewById(R.id.testListView);
listView.setAdapter(adapter);
// Inflate the layout for this fragment
return inflater.inflate(R.layout.list_fragment, container, false);
}
}
}
此代码中是否有任何部分出了错，可能导致此错误?
Is there any bit of this code that stands out as wrong that could be causing this error?
推荐答案
您的片段代码onCreateView()应该首先使包含ListView的list_fragment布局膨胀.然后，您应该在膨胀的布局上而不是在活动上调用findViewById()，因为片段布局还不是活动视图层次结构的一部分.
Your fragment code onCreateView() should first inflate the list_fragment layout that contains the ListView. Then you should be calling findViewById() on the inflated layout and not on the activity since the fragment layout is not yet a part of the activity view hierarchy.
例如:
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.list_fragment, container, false);
listView = (ListView) view.findViewById(R.id.testListView);
listView.setAdapter(adapter);
return view;
这篇关于使用片段:`错误夸大类片段`的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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