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尝试显示我的应用的天气图标时出现问题

分类：编程问答

如何解决尝试显示我的应用的天气图标时出现问题

这最初是在大约 20 天前被问到的，我试图根据城市的响应（来自 drawable 文件夹）在我的应用程序上显示天气图标 来自天气官方 API 文档 https://openweathermap.org/weather-conditions 中列出的天气条件数量（您可以随时通过查看编辑历史来查看）。 API 提供了 9 种主要天气条件。

这仍然是我的目标：

  • 当应用程序第一次打开时，不显示任何图标。

  • 如果用户搜索城市并且得到的响应是晴空，则显示晴空图标；

  • 否则，如果响应是该城市的几朵云，则显示几朵云图标

  • 否则，如果响应是该城市的云散乱，则显示云散乱图标

  • 否则，如果响应是该城市的碎云，则显示碎云图标

  • 否则，如果响应是该城市的阵雨，则显示阵雨图标

  • 否则，如果响应是该城市的下雨，则显示下雨图标

  • 否则，如果响应是该城市的雷暴，则显示雷暴图标

  • 否则，如果响应是该城市的雪，则显示雪图标

  • 否则，如果该城市的响应为 Mist，则显示 Mist 图标。

在 MagDalena Rowicka 的帮助下，我已经完成了一些事情，但即使在尝试自己修复后问题仍未完全解决，这就是我重新悬赏帖子的原因。

我做的第一件事是使用以下数据集创建一个单独的枚举类：

public enum WeatherIcon {
    Sun,Cloud1,Cloud2,Cloud3,Rain1,Rain2,Thunder,SNow,Mist
}

然后我在我在片段上声明我的文本视图的地方添加了这个代码 final ImageView imageofWeather = rootView.findViewById(R.id.imageView2);。

然后我添加了这个 int drawableResource; // 在这里定义默认图标例如 片段上 viewmodel.getWeatherDataLiveData().observe(getViewLifecycleOwner(),data -> { 之后的 R.drawable.default_weather_icon。

然后我终于添加了这段代码：

switch (data.getWeather().get(0).getIcon()) { 
                    case WeatherIcon.Sun:
                        drawableResource = R.drawable.sun; //reference to drawable id
                        break;
                    case WeatherIcon.Cloud1:
                        drawableResource = R.drawable.broken_clouds; //reference to drawable id
                        break;
                    case WeatherIcon.Cloud2:
                        drawableResource = R.drawable.few_clouds; //reference to drawable id
                        break;
                    case WeatherIcon.Cloud3:
                        drawableResource = R.drawable.scattered_clouds; //reference to drawable id
                        break;
                    case WeatherIcon.Rain1:
                        drawableResource = R.drawable.small_rain; //reference to drawable id
                        break;
                    case WeatherIcon.Rain2:
                        drawableResource = R.drawable.shower_rain; //reference to drawable id
                        break;
                    case WeatherIcon.Thunder:
                        drawableResource = R.drawable.thunderstorm; //reference to drawable id
                        break;
                    case WeatherIcon.SNow:
                        drawableResource = R.drawable.sNow; //reference to drawable id
                        break;
                    case WeatherIcon.Mist:
                        drawableResource = R.drawable.mist; //reference to drawable id
                        break;



        imageofWeather.setimageDrawable(drawableResource);
            }

fragment 中的 if 语句下直接访问 API 并显示天气图标。 （相应的 9 个图标目前显示在 firstfragment 类的编号线上）。

当前设置的问题在于：

  • 对于每个 case 语句，我收到以下错误：

分配给'drawableResource'的值R.drawable.sun（和其余的） 从未使用过。

和

必需类型：Drawable，提供：int

如果有人能提供帮助，我将不胜感激。

这是我的片段代码：

public class FirstFragment extends Fragment {

    private WeatherDataviewmodel viewmodel;

    public FirstFragment() {
        // required empty public constructor
    }

    @Override
    public View onCreateView(LayoutInflater inflater,ViewGroup container,Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View rootView = inflater.inflate(R.layout.fragment_first,container,false);
        // For displaying weather data
        // all field in Java should be type in camelCase,so not current_temp but currentTemp,not Cloud_out but cloudOut
        // Capitalize name is for class not field
        final TextView current_temp = rootView.findViewById(R.id.textView10);
        final TextView current_output = rootView.findViewById(R.id.textView11);
        final TextView rise_time = rootView.findViewById(R.id.textView25);
        final TextView set_time = rootView.findViewById(R.id.textView26);
        final TextView temp_out = rootView.findViewById(R.id.textView28);
        final TextView Press_out = rootView.findViewById(R.id.textView29);
        final TextView Humid_out = rootView.findViewById(R.id.textView30);
        final TextView Ws_out = rootView.findViewById(R.id.textView33);
        final TextView Visi_out = rootView.findViewById(R.id.textView34);
        final TextView Cloud_out = rootView.findViewById(R.id.textView35);
        final ImageView imageofWeather = rootView.findViewById(R.id.imageView2);


        // Get our viewmodel instance
        viewmodel = new viewmodelProvider(this).get(WeatherDataviewmodel.class);

        // And whenever the data changes,refresh the UI
        viewmodel.getWeatherDataLiveData().observe(getViewLifecycleOwner(),data -> {

            int drawableResource; // here define default icon for example R.drawable.default_weather_icon

            if (data != null) {
                current_temp.setVisibility(View.VISIBLE);
                current_temp.setText(data.getMain().getTemp() + " ℃"); // for that you can use strings resource and templates more in https://developer.android.com/guide/topics/resources/string-resource.html#formatting-strings
                current_output.setVisibility(View.VISIBLE);
                current_output.setText(data.getWeather().get(0).getDescription());
                rise_time.setVisibility(View.VISIBLE);
                rise_time.setText(data.getSys().getSunrise() + " ");
                set_time.setVisibility(View.VISIBLE);
                set_time.setText(data.getSys().getSunset() + " ");
                temp_out.setVisibility(View.VISIBLE);
                temp_out.setText(data.getMain().getTemp() + " ℃");
                Press_out.setVisibility(View.VISIBLE);
                Press_out.setText(data.getMain().getPressure() + " hpa");
                Humid_out.setVisibility(View.VISIBLE);
                Humid_out.setText(data.getMain().getHumidity() + " %");
                Ws_out.setVisibility(View.VISIBLE);
                Ws_out.setText(data.getwind().getSpeed() + " Km/h");
                Visi_out.setVisibility(View.VISIBLE);
                Visi_out.setText(data.getVisibility() + " m");
                Cloud_out.setVisibility(View.VISIBLE);
                Cloud_out.setText(data.getClouds().getAll() + " %");

                // get actual weather.
                switch (data.getWeather().get(0).getIcon()) { //or data.getWeather()[0].getIcon() i don't remember how it work in Java
                    case WeatherIcon.Sun:
                        drawableResource = R.drawable.sun; //reference to drawable id
                        break;
                    case WeatherIcon.Cloud1:
                        drawableResource = R.drawable.broken_clouds; //reference to drawable id
                        break;
                    case WeatherIcon.Cloud2:
                        drawableResource = R.drawable.few_clouds; //reference to drawable id
                        break;
                    case WeatherIcon.Cloud3:
                        drawableResource = R.drawable.scattered_clouds; //reference to drawable id
                        break;
                    case WeatherIcon.Rain1:
                        drawableResource = R.drawable.small_rain; //reference to drawable id
                        break;
                    case WeatherIcon.Rain2:
                        drawableResource = R.drawable.shower_rain; //reference to drawable id
                        break;
                    case WeatherIcon.Thunder:
                        drawableResource = R.drawable.thunderstorm; //reference to drawable id
                        break;
                    case WeatherIcon.SNow:
                        drawableResource = R.drawable.sNow; //reference to drawable id
                        break;
                    case WeatherIcon.Mist:
                        drawableResource = R.drawable.mist; //reference to drawable id
                        break;



                    imageofWeather.setimageDrawable(drawableResource);
                }

            } else {
                Log.e("TAG","No City found");
                current_temp.setVisibility(View.GONE);
                current_output.setVisibility(View.GONE);
                rise_time.setVisibility(View.GONE);
                set_time.setVisibility(View.GONE);
                temp_out.setVisibility(View.GONE);
                Press_out.setVisibility(View.GONE);
                Humid_out.setVisibility(View.GONE);
                Ws_out.setVisibility(View.GONE);
                Visi_out.setVisibility(View.GONE);
                Cloud_out.setVisibility(View.GONE);
                Toast.makeText(requireActivity(),"No City found",Toast.LENGTH_SHORT).show();
            }
        });

        return rootView;
    }

    public void getWeatherData(String name) {
        // The viewmodel controls loading the data,so we just
        // tell it what the new name is - this kicks off loading
        // the data,which will automatically call through to
        // our observe() call when the data load completes
        viewmodel.setCityName(name);
    }
}

解决方法

也许试试这样：

  1. 使用枚举指定要显示的图标创建一个天气类。
  2. 下载数据后，转换为创建的类
  3. 一个单独的函数，它将决定为给定的枚举显示什么

已编辑：

public class Example{
  // add to your definition
  private WeaterIcon icon;

  public WeaterIcon getIcon() {
      return icon;
  }

  public void setIcon(WeaterIcon icon) {
      this.icon = icon;
  }
}

enum WeaterIcon {
  SUN,FROG,//type all what want
}

在 onCreateView

//there are yor reference to xml object
    final ImageView imageOfWeather = rootView.findViewById(R.id.imageView); // add this reference

并选择正确的图标

int drawableResource; // here define default icon or not
            switch(data.getIcon()) {
                case WeaterIcon.SUN:
                    drawableResource = R.drawable.sun_icon //reference to drawable id
                    break;
                case WeaterIcon.FROG:
                    drawableResource = R.drawable.frog_icon//reference to drawable id
                    break;
                //add all
            }


            imageOfWeather.setImageDrawable(drawableResource);
,

线 imageofWeather.setImageDrawable(drawableResource);显示此错误：

Required type: Drawable,Provided: int

这意味着 setImageDrawable() 需要（期望）一个 Drawable 参数，但提供的（找到的）参数是一个 int。

要解决此问题，请改用 setImageResource()，它采用 int 可绘制资源而不是 Drawable

对于每个 case 语句，我收到以下错误：

The value R.drawable.sun(and the rest) assigned to 'drawableResource' is never used.

这是由于之前的错误而引发的，它认为 drawableResource 的行未使用 setImageDrawable()，因此它警告您您为其分配了一个值但从未使用过它。

这个警告应该通过修复第一个来修复；虽然，我建议用一个私有构造函数重写 enum，该构造函数接受一个 int 可绘制资源值，它将处理 switch 语句，而不是让片段这样做。

新的枚举：

public enum WeatherIcon {

    Sun(R.drawable.sun),Cloud1(R.drawable.broken_clouds),Cloud2(R.drawable.few_clouds),Cloud3(R.drawable.scattered_clouds),Rain1(R.drawable.small_rain),Rain2(R.drawable.shower_rain),Thunder(R.drawable.thunderstorm),Snow(R.drawable.snow),Mist(R.drawable.mist);

    private int drawable;

    WeatherIcon(int drawable) {
        this.drawable = drawable;
    }

    public int getDrawable() {
        return drawable;
    }

}

然后，您可以删除它并通过使用枚举的 switch 方法获取可绘制对象来代替片段中的 getDrawable() 语句，如下所示：

WeatherIcon icon = data.getWeather().get(0).getIcon();
int drawableResource = icon.getDrawable();
imageofWeather.setImageResource(drawableResource);
,

您必须在清单文件中制作 activity-alias，您可以根据天气条件在其中设置图标。

<?xml version="1.0" encoding="utf-8"?>
<manifest  xmlns:android="http://schemas.android.com/apk/res/android"
package="io.github.erikjhordanrey.livebinding">

<uses-permission android:name="android.permission.INTERNET" />

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:roundIcon="@mipmap/ic_launcher_round"
    android:supportsRtl="true"
    android:theme="@style/AppTheme"
    android:usesCleartextTraffic="true">

    <activity android:name="io.github.erikjhordanrey.livebinding.view.DcCharacterActivity">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <action android:name="android.intent.action.VIEW" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>


    <activity-alias
        android:name=".MainActivityAlias"
        android:enabled="false"
        android:icon="@drawable/R.drawable.sun"
        android:label="@string/app_name"
        android:roundIcon="@drawable/R.drawable.sun"
        android:targetActivity="io.github.erikjhordanrey.livebinding.view.DcCharacterActivity">

        <intent-filter>

            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />

        </intent-filter>

    </activity-alias>

    <activity-alias
        android:name=".MainActivityAlias"
        android:enabled="false"
        android:icon="@drawable/R.drawable.broken_clouds"
        android:label="@string/app_name"
        android:roundIcon="@drawable/R.drawable.broken_clouds"
        android:targetActivity="io.github.erikjhordanrey.livebinding.view.DcCharacterActivity">

        <intent-filter>

            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />

        </intent-filter>

    </activity-alias>

    <activity-alias
        android:name=".MainActivityAlias"
        android:enabled="false"
        android:icon="@drawable/R.drawable.few_clouds"
        android:label="@string/app_name"
        android:roundIcon="@drawable/R.drawable.few_clouds"
        android:targetActivity="io.github.erikjhordanrey.livebinding.view.DcCharacterActivity">

        <intent-filter>

            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />

        </intent-filter>

    </activity-alias>

    <!--and so on....-->
</application>

</manifest>

在 MainActivity 文件中，您必须根据天气情况更改图标。

private void newicon() {
      
      // enable old icon
    PackageManager manager=getPackageManager();
    manager.setComponentEnabledSetting(new ComponentName(MainActivity.this,"com.prepare.makedirectory.MainActivity"),PackageManager.COMPONENT_ENABLED_STATE_DISABLED,PackageManager.DONT_KILL_APP);
      
      // enable new icon
    manager.setComponentEnabledSetting(new ComponentName(MainActivity.this,"com.prepare.makedirectory.MainActivityAlias"),PackageManager.COMPONENT_ENABLED_STATE_ENABLED,PackageManager.DONT_KILL_APP);
    Toast.makeText(MainActivity.this,"Enable New Icon",Toast.LENGTH_LONG).show();
}

您可以在此链接中找到整篇文章： https://www.geeksforgeeks.org/how-to-change-app-icon-of-android-programmatically-in-android/

,

请试试这个代码。

public class FirstFragment extends Fragment {

    private WeatherDataViewModel viewModel;

    public FirstFragment() {
        // Required empty public constructor
    }

    @Override
    public View onCreateView(LayoutInflater inflater,ViewGroup container,Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View rootView = inflater.inflate(R.layout.fragment_first,container,false);
        // For displaying weather data
        // all field in Java should be type in camelCase,so not current_temp but currentTemp,not Cloud_out but cloudOut
        // Capitalize name is for class not field
        final TextView current_temp = rootView.findViewById(R.id.textView10);
        final TextView current_output = rootView.findViewById(R.id.textView11);
        final TextView rise_time = rootView.findViewById(R.id.textView25);
        final TextView set_time = rootView.findViewById(R.id.textView26);
        final TextView temp_out = rootView.findViewById(R.id.textView28);
        final TextView Press_out = rootView.findViewById(R.id.textView29);
        final TextView Humid_out = rootView.findViewById(R.id.textView30);
        final TextView Ws_out = rootView.findViewById(R.id.textView33);
        final TextView Visi_out = rootView.findViewById(R.id.textView34);
        final TextView Cloud_out = rootView.findViewById(R.id.textView35);
        final ImageView imageofWeather = rootView.findViewById(R.id.imageView2);


        // Get our ViewModel instance
        viewModel = new ViewModelProvider(this).get(WeatherDataViewModel.class);

        // And whenever the data changes,refresh the UI
        viewModel.getWeatherDataLiveData().observe(getViewLifecycleOwner(),data -> {

            Drawble drawableResource; // default added in switch

            if (data != null) {
                current_temp.setVisibility(View.VISIBLE);
                current_temp.setText(data.getMain().getTemp() + " ℃"); // for that you can use strings resource and templates more in https://developer.android.com/guide/topics/resources/string-resource.html#formatting-strings
                current_output.setVisibility(View.VISIBLE);
                current_output.setText(data.getWeather().get(0).getDescription());
                rise_time.setVisibility(View.VISIBLE);
                rise_time.setText(data.getSys().getSunrise() + " ");
                set_time.setVisibility(View.VISIBLE);
                set_time.setText(data.getSys().getSunset() + " ");
                temp_out.setVisibility(View.VISIBLE);
                temp_out.setText(data.getMain().getTemp() + " ℃");
                Press_out.setVisibility(View.VISIBLE);
                Press_out.setText(data.getMain().getPressure() + " hpa");
                Humid_out.setVisibility(View.VISIBLE);
                Humid_out.setText(data.getMain().getHumidity() + " %");
                Ws_out.setVisibility(View.VISIBLE);
                Ws_out.setText(data.getWind().getSpeed() + " Km/h");
                Visi_out.setVisibility(View.VISIBLE);
                Visi_out.setText(data.getVisibility() + " m");
                Cloud_out.setVisibility(View.VISIBLE);
                Cloud_out.setText(data.getClouds().getAll() + " %");

                Drawable drawableResource; // default icon is set in the switch
            switch (data.getWeather().get(0).getIcon())  {
                case WeaterIcon.SUN:
                    drawableResource = ContextCompat.getDrawable(requireActivity(),R.drawable.sun);
                    break;
                case WeatherIcon.Cloud1:
                        drawableResource = ContextCompat.getDrawable(requireActivity(),R.drawable.broken_clouds); //reference to drawable id
                        break;
                case WeatherIcon.Cloud2:
                        drawableResource = ContextCompat.getDrawable(requireActivity(),R.drawable.few_clouds); //reference to drawable id
                        break;
                case WeatherIcon.Cloud3:
                        drawableResource = ContextCompat.getDrawable(requireActivity(),R.drawable.scattered_clouds); //reference to drawable id
                        break;
                case WeatherIcon.Rain1:
                        drawableResource = ContextCompat.getDrawable(requireActivity(),R.drawable.small_rain); //reference to drawable id
                        break;
                case WeatherIcon.Rain2:
                        drawableResource = ContextCompat.getDrawable(requireActivity(),R.drawable.shower_rain); //reference to drawable id
                        break;
                case WeatherIcon.Thunder:
                        drawableResource = ContextCompat.getDrawable(requireActivity(),R.drawable.thunderstorm); //reference to drawable id
                        break;
                case WeatherIcon.Snow:
                        drawableResource = ContextCompat.getDrawable(requireActivity(),R.drawable.snow); //reference to drawable id
                        break;
                case WeatherIcon.Mist:
                        drawableResource = ContextCompat.getDrawable(requireActivity(),R.drawable.mist); //reference to drawable id
                        break;

                //add a default of any background if error occurs
                default:
                    drawableResource = ContextCompat.getDrawable(requireActivity(),R.drawable.any_background);
                    break;
           
                }
             imageOfWeather.setImageDrawable(drawableResource);

            } else {
                Log.e("TAG","No City found");
                current_temp.setVisibility(View.GONE);
                current_output.setVisibility(View.GONE);
                rise_time.setVisibility(View.GONE);
                set_time.setVisibility(View.GONE);
                temp_out.setVisibility(View.GONE);
                Press_out.setVisibility(View.GONE);
                Humid_out.setVisibility(View.GONE);
                Ws_out.setVisibility(View.GONE);
                Visi_out.setVisibility(View.GONE);
                Cloud_out.setVisibility(View.GONE);
                Toast.makeText(requireActivity(),"No City found",Toast.LENGTH_SHORT).show();
            }
        });

        return rootView;
    }

    public void getWeatherData(String name) {
        // The ViewModel controls loading the data,so we just
        // tell it what the new name is - this kicks off loading
        // the data,which will automatically call through to
        // our observe() call when the data load completes
        viewModel.setCityName(name);
    }
}

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