Question

我无法弄清楚我的代码有什么问题以及为什么我的Sunshine App不会显示我创建的列表项。

我的大多数代码都与视频中的代码相同，但默认情况下有些代码与我使用Android Studio的更新版本不同。如何在列表中显示随机预测数据？运行代码时我得到的只是操作栏中应用程序的名称。

以下是我编码的文件：

MainActvityFragment.java：

package com.example.ashton.sunshine.app;

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 {

    private ArrayAdapter<String> mForecastAdapter;

    public MainActivityFragment() {
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {

        View rootView = inflater.inflate(R.layout.fragment_main, container, false);

        String[] forecastArray = {
                "Today - Sunny - 88/63",
                "Tomorrow - Foggy - 70/46",
                "Weds - Cloudy - 72/63",
                "Thurs - Rainy - 64/51",
                "Fri - Foggy - 70/46",
                "Sat - Sunny - 76/68"
        };

        List<String> weekForecast = new ArrayList<String>(
                Arrays.asList(forecastArray));

        mForecastAdapter = new ArrayAdapter<String>(
                getActivity(),
                R.layout.list_item_forecast,
                R.id.list_item_forecast_textview,
                weekForecast);

        ListView listView = (ListView) rootView.findViewById(R.id.listview_forecast);
        listView.setAdapter(mForecastAdapter);

        return rootView;
    }
}

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:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivityFragment">

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

</FrameLayout>

activity_main.xml -

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/fragment"
    android:name="com.example.ashton.sunshine.app.MainActivityFragment"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:layout="@layout/fragment_main" />

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" />

Answer 1

在您的activity_main.xml中，将FrameLayout更改为fragment

Android Studio Sunshine App

1 个答案: