Question

我正在尝试开发一个包含Fragment的简单应用程序（我第一次使用它）。问题是我的活动主要的XML没有显示标题栏，也许我正在做片段的错误，无法理解什么。

MainActivity.java：

 public class MainActivity extends FragmentActivity {

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

       if(savedInstanceState==null) {
            getSupportFragmentManager().beginTransaction()
                    .add(R.id.fragment, new ForecastFragment()).commit();
        }
    }
}

activity_main.xml：

    <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:name="com.example.sgrumo.sunshineonyourmind.app.Activities.ForecastFragment"
    tools:context=".app.Activities.ForecastFragment">
    <fragment xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools" android:id="@+id/fragment"
        android:name="com.example.sgrumo.sunshineonyourmind.app.Activities.ForecastFragment"
        tools:layout="@layout/fragment_main" android:layout_width="match_parent"
        android:layout_height="match_parent" />

</FrameLayout>

Fragment_main.xml：

<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"
tools:context=".ForecastFragment"
tools:showIn="@layout/activity_main">


<ListView
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/listview_forecast"
    android:layout_gravity="center" />

content_main.xml

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/fragment_forecast"
android:name="com.example.sgrumo.sunshineonyourmind.app.Activities.ForecastFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
 />

ForecastFragment.java

    public class ForecastFragment extends Fragment {

    public ForecastFragment() {}

    String[] forecastArray = {
            "Today - Sunny - 31/20",
            "Tomorrow - Sunny  - 42,30",
            "Wednesday - Rainy - 20,15",
            "Thursday - FINIMONDO - 35,20"
    };
    ArrayList<String> list = new ArrayList<>(Arrays.asList(forecastArray));

    @Override
    public void onCreate(Bundle savedIstanceState ){
        super.onCreate(savedIstanceState);

        setHasOptionsMenu(true);
    }
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View  rootView = inflater.inflate(R.layout.fragment_main, container,false);
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(getActivity(),R.layout.list_item_forecast,R.id.list_item_forecast_textview,list);
        ListView lw = (ListView)rootView.findViewById(R.id.listview_forecast);
        lw.setAdapter(adapter);
        return rootView;
    }

    @Override
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater ) {
        inflater.inflate(R.menu.forecastfragment, menu);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        int id = item.getItemId();
        if( id == R.id.action_refresh ) {
            FetchWeatherTask fetchWeatherTask = new FetchWeatherTask();
            fetchWeatherTask.execute();
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
}

logcat on start：

    08-10 12:22:55.397 2311-2311/com.example.sgrumo.sunshineonyourmind I/art: Not late-enabling -Xcheck:jni (already on)
08-10 12:22:55.397 2311-2311/com.example.sgrumo.sunshineonyourmind W/art: Unexpected CPU variant for X86 using defaults: x86
08-10 12:22:55.433 2311-2311/com.example.sgrumo.sunshineonyourmind W/System: ClassLoader referenced unknown path: /data/app/com.example.sgrumo.sunshineonyourmind-1/lib/x86
08-10 12:23:01.545 2311-2311/com.example.sgrumo.sunshineonyourmind W/System: ClassLoader referenced unknown path: /data/app/com.example.sgrumo.sunshineonyourmind-1/lib/x86
08-10 12:23:01.725 2311-2747/com.example.sgrumo.sunshineonyourmind I/OpenGLRenderer: Initialized EGL, version 1.4
08-10 12:23:01.725 2311-2747/com.example.sgrumo.sunshineonyourmind D/OpenGLRenderer: Swap behavior 1

Answer 1

在花了几个小时试图调试我的应用程序之后，我再次开始选择一个空活动的项目。现在一切都很完美！

活动主页不显示标题栏

1 个答案: