java - InflateException 二进制 XML 文件，第 7 行 : Error inflating class fragment

Question

我一直在研究这个问题，但还没有适合我的解决方案。我在 fragment 类中添加了空构造函数并尝试了不同的 fragment 导入，但似乎没有任何效果。我希望你们能帮助我!

我的 Activity :

package com.example.com.example.android.rssfeed;

import android.app.Activity;
import android.os.Bundle;

public class RssfeedActivity extends Activity implements MyListFragment.OnItemSelectedListener {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_rssfeed);
}

public void onRssItemSelected(String link) {
    DetailFragment fragment = (DetailFragment) getFragmentManager().findFragmentById(R.id.detailFragment);

    if (fragment != null && fragment.isInLayout()) {
        fragment.setText(link);
    }//end if
}//end method onRssItemSelected

}//end class

我的 fragment :

package com.example.com.example.android.rssfeed;
import android.app.Activity;
import android.os.Bundle;
import android.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;


public class MyListFragment extends Fragment {

public MyListFragment() {

}

private OnItemSelectedListener listener;


@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.fragment_rsslist_overview, container, false);
    Button button = (Button) view.findViewById(R.id.btn1);
    button.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            updateDetail();
        }//end onClick
    });
    return view;
}//end onCreateView

public interface OnItemSelectedListener {
    public void onRssItemSelected(String link);
}//end onItemSelectedListener

@Override
    public void onAttach(Activity activity) {
    super.onAttach(activity);

        if (activity instanceof OnItemSelectedListener) {
            listener = (OnItemSelectedListener) activity;

        } else {
            throw new ClassCastException(activity.toString()
                    + "Must implement MyListFragment.OnItemSelectedListener");
        }//end else

}//end onAttach

//May also be triggered from the activity
public void updateDetail() {
    //Create fake data
    String newTime = String.valueOf(System.currentTimeMillis());
    // Send data to Activity
    listener.onRssItemSelected(newTime);
}//end method updateDetail
}//end class

我的 fragment XML:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:baselineAligned="false"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="horizontal" >

    <fragment
        android:id="@+id/listFragment" 
        android:layout_width="0dp"
        android:layout_weight="1"
        android:layout_height="match_parent"
        class="com.example.android.rssfeed.MyListFragment"
        android:layout_marginTop="?android:attr/actionBarSize"></fragment>



    <fragment
        android:id="@+id/detailFragment"
        android:layout_width="0dp"
        android:layout_weight="2"
        android:layout_height="match_parent"
        class="com.example.android.rssfeed.DetailFragment"></fragment>




</LinearLayout>

list :

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.com.example.android.rssfeed"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
    android:minSdkVersion="12"
    android:targetSdkVersion="19" />

<application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity
        android:name="com.example.com.example.android.rssfeed.RssfeedActivity"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
</application>

按钮 XML:

<?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:orientation="vertical" >

<button
    android:id="@+id/btn1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Press to Update">

</button>
</LinearLayout>

LogCat 错误:

05-17 10:35:01.864: E/AndroidRuntime(6384): FATAL EXCEPTION: main
05-17 10:35:01.864: E/AndroidRuntime(6384): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.com.example.android.rssfeed/com.example.com.example.android.rssfeed.RssfeedActivity}: android.view.InflateException: Binary XML file line #7: Error inflating class fragment
05-17 10:35:01.864: E/AndroidRuntime(6384):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2245)
05-17 10:35:01.864: E/AndroidRuntime(6384):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2295)
05-17 10:35:01.864: E/AndroidRuntime(6384):     at android.app.ActivityThread.access$700(ActivityThread.java:150)
05-17 10:35:01.864: E/AndroidRuntime(6384):     at  android.app.ActivityThread$H.handleMessage(ActivityThread.java:1280)
05-17 10:35:01.864: E/AndroidRuntime(6384):     at android.os.Handler.dispatchMessage(Handler.java:99)
05-17 10:35:01.864: E/AndroidRuntime(6384):     at android.os.Looper.loop(Looper.java:137)
05-17 10:35:01.864: E/AndroidRuntime(6384):     at android.app.ActivityThread.main(ActivityThread.java:5279)
05-17 10:35:01.864: E/AndroidRuntime(6384):     at java.lang.reflect.Method.invokeNative(Native Method)
05-17 10:35:01.864: E/AndroidRuntime(6384):     at java.lang.reflect.Method.invoke(Method.java:511)
05-17 10:35:01.864: E/AndroidRuntime(6384):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1102)
05-17 10:35:01.864: E/AndroidRuntime(6384):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:869)
05-17 10:35:01.864: E/AndroidRuntime(6384):     at dalvik.system.NativeStart.main(Native Method)
05-17 10:35:01.864: E/AndroidRuntime(6384): Caused by: android.view.InflateException: Binary XML file line #7: Error inflating class fragment
05-17 10:35:01.864: E/AndroidRuntime(6384):     at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:710)
05-17 10:35:01.864: E/AndroidRuntime(6384):     at android.view.LayoutInflater.rInflate(LayoutInflater.java:752)
05-17 10:35:01.864: E/AndroidRuntime(6384):     at android.view.LayoutInflater.inflate(LayoutInflater.java:495)
05-17 10:35:01.864: E/AndroidRuntime(6384):     at android.view.LayoutInflater.inflate(LayoutInflater.java:397)
05-17 10:35:01.864: E/AndroidRuntime(6384):     at android.view.LayoutInflater.inflate(LayoutInflater.java:353)
05-17 10:35:01.864: E/AndroidRuntime(6384):     at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:342)
05-17 10:35:01.864: E/AndroidRuntime(6384):     at android.app.Activity.setContentView(Activity.java:1928)
05-17 10:35:01.864: E/AndroidRuntime(6384):     at com.example.com.example.android.rssfeed.RssfeedActivity.onCreate(RssfeedActivity.java:11)
05-17 10:35:01.864: E/AndroidRuntime(6384):     at android.app.Activity.performCreate(Activity.java:5267)
05-17 10:35:01.864: E/AndroidRuntime(6384):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1097)
05-17 10:35:01.864: E/AndroidRuntime(6384):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2209)
05-17 10:35:01.864: E/AndroidRuntime(6384):     ... 11 more
05-17 10:35:01.864: E/AndroidRuntime(6384): Caused by: android.app.Fragment$InstantiationException: Unable to instantiate fragment com.example.android.rssfeed.MyListFragment: make sure class name exists, is public, and has an empty constructor that is public
05-17 10:35:01.864: E/AndroidRuntime(6384):     at android.app.Fragment.instantiate(Fragment.java:592)
05-17 10:35:01.864: E/AndroidRuntime(6384):     at android.app.Fragment.instantiate(Fragment.java:560)
05-17 10:35:01.864: E/AndroidRuntime(6384):     at android.app.Activity.onCreateView(Activity.java:4862)
05-17 10:35:01.864: E/AndroidRuntime(6384):     at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:686)
05-17 10:35:01.864: E/AndroidRuntime(6384):     ... 21 more
05-17 10:35:01.864: E/AndroidRuntime(6384): Caused by: java.lang.ClassNotFoundException: Didn't find class "com.example.android.rssfeed.MyListFragment" on path: /data/app/com.example.com.example.android.rssfeed-1.apk
05-17 10:35:01.864: E/AndroidRuntime(6384):     at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:65)
05-17 10:35:01.864: E/AndroidRuntime(6384):     at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
05-17 10:35:01.864: E/AndroidRuntime(6384):     at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
05-17 10:35:01.864: E/AndroidRuntime(6384):     at android.app.Fragment.instantiate(Fragment.java:582)
05-17 10:35:01.864: E/AndroidRuntime(6384):     ... 24 more

Answer 1

Caused by: java.lang.ClassNotFoundException: Didn't find class "com.example.android.rssfeed.MyListFragment" on path: /data/app/com.example.com.example.android.rssfeed-1.apk

改变这个

 class="com.example.android.rssfeed.MyListFragment"

到

 class="com.example.com.example.android.rssfeed.MyListFragment"

因为包名是package com.example.com.example.android.rssfeed。

同理

 class="com.example.com.example.android.rssfeed.DetailFragment"

如果包名相同

改变这个

<button
android:id="@+id/btn1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Press to Update">

到

<Button
android:id="@+id/btn1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Press to Update" />