android – 在Activity中显示片段 – 类无法实例化

概述我是 Android新手,刚开始学习. 我的Android Studio不支持使用Fragment进行空白活动. 所以,我稍后手动添加它. 但是当我向main_activity.xml添加Fragment引用时,应用程序在模拟器中停止. 主要活动： package com.example.urvashirohilla.sunshine.app;import android.support.v 我是 Android新手,刚开始学习.
我的AndroID Studio不支持使用Fragment进行空白活动.
所以,我稍后手动添加它.

但是当我向main_activity.xml添加Fragment引用时,应用程序在模拟器中停止.

主要活动：

package com.example.urvashirohilla.sunshine.app;import androID.support.v7.app.AppCompatActivity;import androID.os.Bundle;public  class MainActivity extends AppCompatActivity  {    @OverrIDe    protected voID onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentVIEw(R.layout.activity_main);    }}

片段类：

package com.example.urvashirohilla.sunshine.app;import androID.content.Context;import androID.net.Uri;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.ArrayAdapter;import androID.Widget.ListVIEw;import java.util.ArrayList;import java.util.Arrays;import java.util.List;public class PlaceholderFragment extends Fragment {    // Todo: Rename parameter arguments,choose names that match    // the fragment initialization parameters,e.g. ARG_ITEM_NUMBER    private static final String ARG_ParaM1 = "param1";    private static final String ARG_ParaM2 = "param2";    // Todo: Rename and change types of parameters    private String mParam1;    private String mParam2;    private OnFragmentInteractionListener mListener;    public PlaceholderFragment() {        // required empty public constructor    }    public static PlaceholderFragment newInstance(String param1,String param2) {        PlaceholderFragment fragment = new PlaceholderFragment();        Bundle args = new Bundle();        args.putString(ARG_ParaM1,param1);        args.putString(ARG_ParaM2,param2);        fragment.setArguments(args);        return fragment;    }    @OverrIDe    public voID onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        if (getArguments() != null) {            mParam1 = getArguments().getString(ARG_ParaM1);            mParam2 = getArguments().getString(ARG_ParaM2);        }    }    @OverrIDe    public VIEw onCreateVIEw(LayoutInflater inflater,VIEwGroup container,Bundle savedInstanceState) {        // Inflate the layout for this fragment        // Create some dummy data for the ListVIEw.  Here's a sample weekly forecast        String[] data = {                "Mon 6/23 - Sunny - 31/17","Tue 6/24 - Foggy - 21/8","Wed 6/25 - Cloudy - 22/17","Thurs 6/26 - Rainy - 18/11","Fri 6/27 - Foggy - 21/10","Sat 6/28 - TRAPPED IN WEATHERSTATION - 23/18","Sun 6/29 - Sunny - 20/7"        };        List<String> weekForecast = new ArrayList<String>(Arrays.asList(data));        ArrayAdapter<String> mWeekForecastAdapter = new ArrayAdapter<String>(getActivity(),R.layout.List_item_forecast,R.ID.List_item_forecast_text_vIEw,weekForecast);        VIEw rootVIEw = inflater.inflate(R.layout.fragment_placeholder,container,false);        ListVIEw ListVIEw = (ListVIEw) rootVIEw.findVIEwByID(R.ID.List_vIEw_forecast);        ListVIEw.setAdapter(mWeekForecastAdapter);        return rootVIEw;    }    // Todo: Rename method,update argument and hook method into UI event    public voID onbuttonpressed(Uri uri) {        if (mListener != null) {            mListener.onFragmentInteraction(uri);        }    }    @OverrIDe    public voID onAttach(Context context) {        super.onAttach(context);        if (context instanceof OnFragmentInteractionListener) {            mListener = (OnFragmentInteractionListener) context;        } else {            throw new RuntimeException(context.toString()                    + " must implement OnFragmentInteractionListener");        }    }    @OverrIDe    public voID onDetach() {        super.onDetach();        mListener = null;    }    public interface OnFragmentInteractionListener {        // Todo: Update argument type and name        voID onFragmentInteraction(Uri uri);    }}

main_activity.xml

<?xml version="1.0" enCoding="utf-8"?><relativeLayout 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"    tools:context="com.example.urvashirohilla.sunshine.app.MainActivity"><fragment class = "com.example.urvashirohilla.sunshine.app.PlaceholderFragment"    androID:ID ="@+ID/fragment_place"    androID:layout_wIDth="wrap_content"    androID:layout_height="wrap_content"    tools:layout="@layout/fragment_placeholder" /></relativeLayout>

更新Logcat：

09-08 16:58:22.772 2244-2244/com.example.urvashirohilla.sunshine.app E/libprocessgroup: Failed to make and chown /acct/uID_10058: Read-only file system09-08 16:58:22.772 2244-2244/com.example.urvashirohilla.sunshine.app W/Zygote: createProcessGroup Failed,kernel missing CONfig_CGROUP_cpuACCT?09-08 16:58:22.774 2244-2244/com.example.urvashirohilla.sunshine.app I/art: Not late-enabling -Xcheck:jni (already on)09-08 16:58:23.195 2244-2257/com.example.urvashirohilla.sunshine.app I/art: Background sticky concurrent mark sweep GC freed 8208(424KB) AllocSpace objects,5(105KB) LOS objects,39% free,678KB/1117KB,paused 5.661ms total 73.994ms09-08 16:58:25.607 2244-2252/com.example.urvashirohilla.sunshine.app W/art: Suspending all threads took: 28.005ms09-08 16:58:26.088 2244-2257/com.example.urvashirohilla.sunshine.app W/art: Suspending all threads took: 30.701ms09-08 16:58:26.772 2244-2252/com.example.urvashirohilla.sunshine.app W/art: Suspending all threads took: 183.063ms09-08 16:58:26.824 2244-2244/com.example.urvashirohilla.sunshine.app W/art: Before AndroID 4.1,method androID.graphics.PorterDuffcolorFilter androID.support.graphics.drawable.VectorDrawableCompat.updateTintFilter(androID.graphics.PorterDuffcolorFilter,androID.content.res.colorStateList,androID.graphics.PorterDuff$Mode) would have incorrectly overrIDden the package-private method in androID.graphics.drawable.Drawable09-08 16:58:27.106 2244-2252/com.example.urvashirohilla.sunshine.app W/art: Suspending all threads took: 14.965ms09-08 16:58:27.353 2244-2244/com.example.urvashirohilla.sunshine.app D/AndroIDRuntime: Shutting down VM                                                                                       --------- beginning of crash09-08 16:58:27.354 2244-2244/com.example.urvashirohilla.sunshine.app E/AndroIDRuntime: FATAL EXCEPTION: main                                                                                       Process: com.example.urvashirohilla.sunshine.app,PID: 2244                                                                                       java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.urvashirohilla.sunshine.app/com.example.urvashirohilla.sunshine.app.MainActivity}: androID.vIEw.InflateException: Binary XML file line #11: Error inflating class fragment                                                                                           at androID.app.ActivityThread.performlaunchActivity(ActivityThread.java:2325)                                                                                           at androID.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)                                                                                           at androID.app.ActivityThread.access0(ActivityThread.java:151)                                                                                           at androID.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)                                                                                           at androID.os.Handler.dispatchMessage(Handler.java:102)                                                                                           at androID.os.Looper.loop(Looper.java:135)                                                                                           at androID.app.ActivityThread.main(ActivityThread.java:5254)                                                                                           at java.lang.reflect.Method.invoke(Native Method)                                                                                           at java.lang.reflect.Method.invoke(Method.java:372)                                                                                           at com.androID.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)                                                                                           at com.androID.internal.os.ZygoteInit.main(ZygoteInit.java:698)                                                                                        Caused by: androID.vIEw.InflateException: Binary XML file line #11: Error inflating class fragment                                                                                           at androID.vIEw.LayoutInflater.createVIEwFromTag(LayoutInflater.java:763)                                                                                           at androID.vIEw.LayoutInflater.rInflate(LayoutInflater.java:806)                                                                                           at androID.vIEw.LayoutInflater.inflate(LayoutInflater.java:504)                                                                                           at androID.vIEw.LayoutInflater.inflate(LayoutInflater.java:414)                                                                                           at androID.vIEw.LayoutInflater.inflate(LayoutInflater.java:365)                                                                                           at androID.support.v7.app.AppCompatDelegateImplV7.setContentVIEw(AppCompatDelegateImplV7.java:280)                                                                                           at androID.support.v7.app.AppCompatActivity.setContentVIEw(AppCompatActivity.java:140)                                                                                           at com.example.urvashirohilla.sunshine.app.MainActivity.onCreate(MainActivity.java:15)                                                                                           at androID.app.Activity.performCreate(Activity.java:5990)                                                                                           at androID.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)                                                                                           at androID.app.ActivityThread.performlaunchActivity(ActivityThread.java:2278)                                                                                           at androID.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)                                                                                            at androID.app.ActivityThread.access0(ActivityThread.java:151)                                                                                            at androID.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)                                                                                            at androID.os.Handler.dispatchMessage(Handler.java:102)                                                                                            at androID.os.Looper.loop(Looper.java:135)                                                                                            at androID.app.ActivityThread.main(ActivityThread.java:5254)                                                                                            at java.lang.reflect.Method.invoke(Native Method)                                                                                            at java.lang.reflect.Method.invoke(Method.java:372)                                                                                            at com.androID.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)                                                                                            at com.androID.internal.os.ZygoteInit.main(ZygoteInit.java:698)                                                                                         Caused by: java.lang.RuntimeException: com.example.urvashirohilla.sunshine.app.MainActivity@1bef27fa must implement OnFragmentInteractionListener                                                                                           at com.example.urvashirohilla.sunshine.app.PlaceholderFragment.onAttach(PlaceholderFragment.java:109)                                                                                           at androID.support.v4.app.FragmentManagerImpl.movetoState(FragmentManager.java:1019)                                                                                           at androID.support.v4.app.FragmentManagerImpl.movetoState(FragmentManager.java:1230)                                                                                           at androID.support.v4.app.FragmentManagerImpl.addFragment(FragmentManager.java:1332)                                                                                           at androID.support.v4.app.FragmentManagerImpl.onCreateVIEw(FragmentManager.java:2288)                                                                                           at androID.support.v4.app.FragmentController.onCreateVIEw(FragmentController.java:120)                                                                                           at androID.support.v4.app.FragmentActivity.dispatchFragmentsOnCreateVIEw(FragmentActivity.java:356)                                                                                           at androID.support.v4.app.BaseFragmentActivityHoneycomb.onCreateVIEw(BaseFragmentActivityHoneycomb.java:31)                                                                                           at androID.support.v4.app.FragmentActivity.onCreateVIEw(FragmentActivity.java:79)                                                                                           at androID.vIEw.LayoutInflater.createVIEwFromTag(LayoutInflater.java:733)                                                                                           at androID.vIEw.LayoutInflater.rInflate(LayoutInflater.java:806)                                                                                            at androID.vIEw.LayoutInflater.inflate(LayoutInflater.java:504)                                                                                            at androID.vIEw.LayoutInflater.inflate(LayoutInflater.java:414)                                                                                            at androID.vIEw.LayoutInflater.inflate(LayoutInflater.java:365)                                                                                            at androID.support.v7.app.AppCompatDelegateImplV7.setContentVIEw(AppCompatDelegateImplV7.java:280)                                                                                            at androID.support.v7.app.AppCompatActivity.setContentVIEw(AppCompatActivity.java:140)                                                                                            at com.example.urvashirohilla.sunshine.app.MainActivity.onCreate(MainActivity.java:15)                                                                                            at androID.app.Activity.performCreate(Activity.java:5990)                                                                                            at androID.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)                                                                                            at androID.app.ActivityThread.performlaunchActivity(ActivityThread.java:2278)                                                                                            at androID.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)                                                                                            at androID.app.ActivityThread.access0(ActivityThread.java:151)                                                                                            at androID.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)                                                                                            at androID.os.Handler.dispatchMessage(Handler.java:102)                                                                                            at androID.os.Looper.loop(Looper.java:135)                                                                                            at androID.app.ActivityThread.main(ActivityThread.java:5254)                                                                                            at java.lang.reflect.Method.invoke(Native Method)                                                                                            at java.lang.reflect.Method.invoke(Method.java:372)                                                                                            at com.androID.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)                                                                                            at com.androID.internal.os.ZygoteInit.main(ZygoteInit.java:698) 

解决方法 看起来你错过了必须在这一行上实现OnFragmentInteractionListener.

public class MainActivity extends FragmentActivity

此外,如果使用支持库,那么AppCompatActivity是推荐的扩展类(它扩展了FragmentActivity本身)

换一种说法,

public class MainActivity extends AppCompatActivity           implements OnFragmentInteractionListener

然后,如果您从中获得错误,那么很可能您在该活动的清单中缺少AppCompat主题

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