Question

我是Android开发的新手，目前正在开发开发Android应用程序的udacity课程。我已经找到了所有可能的答案，但没有一个工作。我的代码看起来非常好，我没有得到任何日志中的错误。但不幸的是我的输出是空白的。没有任何东西出现。

这是我的java代码： 1. MainActivity.java。

package com.example.vineet_kr.sunshine;

import android.app.Fragment;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.LayoutInflater;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                        .setAction("Action", null).show();
            }
        });
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }


}

2.mainActivityFragment.java

package com.example.vineet_kr.sunshine;

import android.support.v4.app.Fragment;
import android.os.Bundle;
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;

/**
 * A placeholder fragment containing a simple view.
 */
public class MainActivityFragment extends Fragment {

    public MainActivityFragment() {
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
    {
        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> forecast = new ArrayAdapter<String>(getActivity().getApplicationContext(), R.layout.list_item_forecast, R.id.list_item_forecast_textView,WeekForecast );
        View  rootView = inflater.inflate(R.layout.fragment_main, container, false);
        ListView list = (ListView) rootView.findViewById(R.id.listView_forecast);
        list.setAdapter(forecast);
        return inflater.inflate(R.layout.fragment_main, container, false);
    }
}

这是Xml文件。 1.list_Item_forecast.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="wrap_content"
    android:gravity="center_vertical"
    android:id="@+id/list_item_forecast_textView"
    android:minHeight="?android:attr/listPreferredItemHeight"/>

2.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="com.example.vineet_kr.sunshine.MainActivityFragment"
    tools:showIn="@layout/activity_main">

    <ListView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/listView_forecast"
         />

</FrameLayout>

3.content_main.xml

<fragment 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"
    android:name="com.example.vineet_kr.sunshine.MainActivityFragment"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    tools:layout="@layout/fragment_main" />

activity_main.xml中

<android.support.design.widget.AppBarLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:theme="@style/AppTheme.AppBarOverlay">

    <android.support.v7.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        android:background="?attr/colorPrimary"
        app:popupTheme="@style/AppTheme.PopupOverlay" />

</android.support.design.widget.AppBarLayout>

<include layout="@layout/content_main" />

<android.support.design.widget.FloatingActionButton
    android:id="@+id/fab"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="bottom|end"
    android:layout_margin="@dimen/fab_margin"
    android:src="@android:drawable/ic_dialog_email" />

无法在片段布局中填充列表视图

0 个答案: