java - 安卓.view.InflateException : Binary XML file line #8: Error inflating class fragment

Question

我正在尝试将布局膨胀为 fragment 我有#8:错误膨胀类 fragment 我的 View 甚至没有创建它落在膨胀如何正确充气布局？

我的 XML 大:

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

        <fragment 
                  android:id="@+id/first_page"
                  android:layout_weight="1"
                  android:layout_width="0dp"
                  android:layout_height="match_parent"
                  class = "com.project.places.First_Page"   
                    />

        <fragment 
                  android:id="@+id/map"
                  android:layout_weight="2"
                  android:layout_width="0dp"
                  android:layout_height="match_parent"
                  android:name="com.project.places.Map_fragment"
                   />


    </LinearLayout>

我的容器:

    </FrameLayout>

我的 fragment 布局:

android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:padding="10sp" >

<ScrollView
    android:id="@+id/scrollView1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" >

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical" >



        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical"
            android:padding="10dp" >

            <ImageButton
                android:id="@+id/search_By_Location"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="center_horizontal"
                android:src="@drawable/location" />

            <TextView
                android:id="@+id/search_By_Location_TextView"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="center_horizontal"
                android:text="Search By Your Current Location"
                android:textAppearance="?android:attr/textAppearanceLarge" />
        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical"
            android:padding="10dp" >

            <ImageButton
                android:id="@+id/search_By_City"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="center_horizontal"
                android:src="@drawable/city_icon" />

            <TextView
                android:id="@+id/search_By_City_TextView"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="center_horizontal"
                android:text="Search By City"
                android:textAppearance="?android:attr/textAppearanceLarge" />
        </LinearLayout><LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical" android:padding="10dp">

            <ImageButton 
                android:id="@+id/favorits" 
                android:layout_width="wrap_content"
                android:layout_height="wrap_content" 
                android:layout_gravity="center_horizontal" 
                android:src="@drawable/location_star"
                 />

            <TextView android:id="@+id/favorits_TextView"
                  android:layout_width="wrap_content"
                  android:layout_height="wrap_content"
                  android:layout_gravity="center_horizontal"
                  android:text="Browser Favorites"
                  android:textAppearance="?android:attr/textAppearanceLarge" />
        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical"
            android:padding="10dp" >

            <ImageButton
                android:id="@+id/history"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="center_horizontal"
                android:src="@drawable/location_clock" />

            <TextView
                android:id="@+id/history_TextView"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="center_horizontal"
                android:text="Browser History"
                android:textAppearance="?android:attr/textAppearanceLarge" />
          </LinearLayout>

       </LinearLayout>
   </ScrollView>

</LinearLayout>

Java 主程序:

    my class java first :


    package com.project.places;

    import android.app.Activity;
    import android.os.Bundle;
    import android.support.v4.app.Fragment;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.ViewGroup;
    import android.widget.ImageButton;
    import android.widget.Toast;

    public class First_Page extends Fragment{


        onSearchTypeListener searchType_Callback;

        public interface onSearchTypeListener{
            public void searchTypeSelected(String type);
        }


        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
            return inflater.inflate(R.layout.first_page, container, false);
        }

        @Override
        public void onViewCreated(View view, Bundle savedInstanceState) {


            ImageButton by_city =(ImageButton)getActivity().findViewById(R.id.search_By_City);
            by_city.setOnClickListener(new View.OnClickListener() {

                @Override
                public void onClick(View v) {
                    //Toast.makeText(getActivity(), "by_city", Toast.LENGTH_SHORT).show();
                    searchType_Callback.searchTypeSelected("city");
                }
            });

            ImageButton by_location =(ImageButton)getActivity().findViewById(R.id.search_By_Location);
            by_location.setOnClickListener(new View.OnClickListener() {

                @Override
                public void onClick(View v) {
                    //Toast.makeText(getActivity(), "by_location", Toast.LENGTH_SHORT).show();
                    searchType_Callback.searchTypeSelected("location");

                }
            });

            ImageButton favorits =(ImageButton)getActivity().findViewById(R.id.favorits);
            favorits.setOnClickListener(new View.OnClickListener() {

                @Override
                public void onClick(View v) {
                    Toast.makeText(getActivity(), "favorits", Toast.LENGTH_SHORT).show();
                    searchType_Callback.searchTypeSelected("favorits");

                }
            });

            ImageButton history =(ImageButton)getActivity().findViewById(R.id.history);
            history.setOnClickListener(new View.OnClickListener() {

                @Override
                public void onClick(View v) {
                    Toast.makeText(getActivity(), "history", Toast.LENGTH_SHORT).show();
                    searchType_Callback.searchTypeSelected("history");

                }
            });
        }

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

            try {
                searchType_Callback = (onSearchTypeListener)activity;
            } catch (ClassCastException e) {
                throw new ClassCastException(activity.toString() + " must implement onSearchTypeListener");
            }
        }

    }

日志文件

                01start activity ComponentInfoandroid.view.InflateException: Binary XML file line #8: Error inflating class fragment
-   at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2306)
-   at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2358)
-   at android.app.ActivityThread.access$600(ActivityThread.java:156)
-   at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1340)
-   at android.os.Handler.dispatchMessage(Handler.java:99)
-   at android.os.Looper.loop(Looper.java:153)
-   at android.app.ActivityThread.main(ActivityThread.java:5299)
-   at java.lang.reflect.Method.invokeNative(Native Method)
-   at java.lang.reflect.Method.invoke(Method.java:511)
-   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:833)
-   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
-   at dalvik.system.NativeStart.main(Native Method)
- Caused by: android.view.InflateException: Binary XML file line #8: Error inflating class fragment
-   at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:704)
-   at android.view.LayoutInflater.rInflate(LayoutInflater.java:746)
-   at android.view.LayoutInflater.inflate(LayoutInflater.java:489)
-   at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
-   at android.view.LayoutInflater.inflate(LayoutInflater.java:352)
-   at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:278)
-   at android.app.Activity.setContentView(Activity.java:1881)
-   at com.project.places.MainActivity.onCreate(MainActivity.java:18)
-   at android.app.Activity.performCreate(Activity.java:5122)
-   at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1081)
-   at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2270)
-   ... 11 more
- Caused by: java.lang.NullPointerException
-   at com.project.places.First_Page.onViewCreated(First_Page.java:36)
-   at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:906)
-   at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1082)
-   at android.support.v4.app.FragmentManagerImpl.addFragment(FragmentManager.java:1184)
-   at android.support.v4.app.FragmentActivity.onCreateView(FragmentActivity.java:291)
-   at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:676)
-   ... 21 more

Answer 1

Caused by: java.lang.NullPointerException - at com.project.places.First_Page.onViewCreated(First_Page.java:36

在您的 onViewCreated() 中，您应该使用 view.findViewById() 而不是 getActivity().findViewById() 访问 fragment UI View >。该 fragment 尚未附加到 Activity，因此也未在 Activity 的 View 层次结构中找到它。