问题描述
我正在使用 https://openweathermap.org/current 构建天气应用程序，到目前为止，一切进展顺利。应用程序的活动部分使用我的界面中的城市查询来提供在编辑文本上搜索的任何城市的当前数据。现在的问题是我只使用了一个搜索按钮（在我的活动中），但我也想在片段类中接收相同的数据。例如，我将活动用于： 1.城市名称的搜索和显示。 2. 显示这些城市的当前时间。
用于获取在活动中搜索的城市的温度、日出和日落、湿度和其他数据的片段。
所以我不能仅仅为了获取数据而实现双重搜索按钮（在活动和片段中）。我的目标是只使用自己的活动来获取两个类中的城市数据，因为我的片段类也包含用于接收数据的文本视图，我会很感激任何实现这一点的方法，因为我自己不知道如何做到这一点。>
我尝试在片段类上调用相同的方法，但我从片段中的这段代码中得到编译错误：
private void getWeatherData(String name) {
ApiInterface apiInterface = apiclient.getClient().create(ApiInterface.class);
Call<Example> call = apiInterface.getWeatherData(name);
说：'getWeatherData' is never used 和 cannot resolve symbol 'name'（因为我的搜索按钮和编辑文本仅用于活动）
我在活动中没有收到任何错误
这是我的完整代码：
HomeActivity.java
public class HomeActivity extends AppCompatActivity {
// User current time
TextView time_field;
ImageView Search;
EditText textfield;
ConstraintLayout constraintLayout;
public static int count=0;
int[] drawable =new int[]{R.drawable.dubai,R.drawable.central_bank_of_nigeria,R.drawable.eiffel_tower,R.drawable.hong_kong,R.drawable.statue_of_liberty};
Timer _t;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
time_field = findViewById(R.id.textView9);
Search = findViewById(R.id.imageView4);
textfield = findViewById(R.id.textfield);
BottomNavigationView bottomNavigationView = findViewById(R.id.bottomNavigationView);
NavController navController = Navigation.findNavController(this,R.id.fragment);
NavigationUI.setupWithNavController(bottomNavigationView,navController);
Search.setonClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
getWeatherData(textfield.getText().toString().trim());
constraintLayout = findViewById(R.id.layout);
constraintLayout.setBackgroundResource(R.drawable.dubai);
_t = new Timer();
_t.scheduleAtFixedrate(new TimerTask() {
@Override
public void run() {
// run on ui thread
runOnUiThread(() -> {
if (count < drawable.length) {
constraintLayout.setBackgroundResource(drawable[count]);
count = (count + 1) % drawable.length;
}
});
}
},5000,5000);
}
private void getWeatherData(String name) {
ApiInterface apiInterface = apiclient.getClient().create(ApiInterface.class);
Call<Example> call = apiInterface.getWeatherData(name);
call.enqueue(new Callback<Example>() {
@Override
public void onResponse(@NotNull Call<Example> call,@NotNull Response<Example> response) {
assert response.body() != null;
time_field.setText(String.valueOf(response.body().getDt()));
}
@Override
public void onFailure(@NotNull Call<Example> call,@NotNull Throwable t) {
t.printstacktrace();
}
});
}
});
}
}
FirstFragment.java
public class FirstFragment extends Fragment {
// User current time,current temperature,current condition,sunrise,sunset,temperature,pressure,humidity,wind_speed,visibility,clouds
TextView current_temp,current_output,rise_time,set_time,temp_out,Press_out,Humid_out,Ws_out,Visi_out,Cloud_out;
// 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;
public FirstFragment() {
// required empty public constructor
}
/**
* Use this factory method to create a new instance of
* this fragment using the provided parameters.
*
* @param param1 Parameter 1.
* @param param2 Parameter 2.
* @return A new instance of fragment SecondFragment.
*/
// Todo: Rename and change types and number of parameters
public static FirstFragment newInstance(String param1,String param2) {
FirstFragment fragment = new FirstFragment();
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
View rootView = inflater.inflate(R.layout.fragment_first,container,false);
current_temp = rootView.findViewById(R.id.textView10);
current_output = rootView.findViewById(R.id.textView11);
rise_time = rootView.findViewById(R.id.textView25);
set_time = rootView.findViewById(R.id.textView26);
temp_out = rootView.findViewById(R.id.textView28);
Press_out = rootView.findViewById(R.id.textView29);
Humid_out = rootView.findViewById(R.id.textView30);
Ws_out = rootView.findViewById(R.id.textView33);
Visi_out = rootView.findViewById(R.id.textView34);
Cloud_out = rootView.findViewById(R.id.textView35);
private void getWeatherData(String name) {
ApiInterface apiInterface = apiclient.getClient().create(ApiInterface.class);
Call<Example> call = apiInterface.getWeatherData(name);
call.enqueue(new Callback<Example>() {
@Override
public void onResponse(@NotNull Call<Example> call,@NotNull Response<Example> response) {
current_temp.setText(response.body().getMain().getTemp() + " ℃");
current_output.setText(response.body().getWeatherList().get(0).getDescription());
rise_time.setText(response.body().getSys().getSunrise() + " ");
set_time.setText(response.body().getSys().getSunset() + " ");
temp_out.setText(response.body().getMain().getTemp() + " ℃");
Press_out.setText(response.body().getMain().getPressure() + " hpa");
Humid_out.setText(response.body().getMain().getHumidity() + " %");
Ws_out.setText(response.body().getwind().getSpeed() + " Km/h");
Visi_out.setText(response.body().getVisibility() + " m");
Cloud_out.setText(response.body().getClouds().getAll()+ " %");
}
@Override
public void onFailure(@NotNull Call<Example> call,@NotNull Throwable t) {
t.printstacktrace();
}
});
}
return rootView;
}
}
API接口：
public interface ApiInterface {
@GET("weather?&appid=(My app key)&units=metric")
Call<Example> getWeatherData(@Query("q") String name);
}
public class apiclient {
private static Retrofit retrofit = null;
public static Retrofit getClient(){ //creating object
if (retrofit == null) {
retrofit = new Retrofit.Builder()
.baseUrl("https://api.openweathermap.org/data/2.5/")
.addConverterFactory(GsonConverterFactory.create())
.build();
}
return retrofit;
}
}
解决方法
您使用的 Java 方法与其语法不同：
您没有在活动中收到任何错误，因为您已经在匿名类中定义了它，但是在您的片段中收到了一个错误，因为您将它写入了另一个在 java 中不正确的方法中。
因此，从另一个方法（在 onCreateView 之外）编写您的方法，然后在那里调用它。
public class FirstFragment extends Fragment {
// User current time,current temperature,current condition,sunrise,sunset,temperature,pressure,humidity,wind_speed,visibility,clouds
TextView current_temp,current_output,rise_time,set_time,temp_out,Press_out,Humid_out,Ws_out,Visi_out,Cloud_out;
// 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;
public FirstFragment() {
// Required empty public constructor
}
/**
* Use this factory method to create a new instance of
* this fragment using the provided parameters.
*
* @param param1 Parameter 1.
* @param param2 Parameter 2.
* @return A new instance of fragment SecondFragment.
*/
// TODO: Rename and change types and number of parameters
public static FirstFragment newInstance(String param1,String param2) {
FirstFragment fragment = new FirstFragment();
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
View rootView = inflater.inflate(R.layout.fragment_first,container,false);
current_temp = rootView.findViewById(R.id.textView10);
current_output = rootView.findViewById(R.id.textView11);
rise_time = rootView.findViewById(R.id.textView25);
set_time = rootView.findViewById(R.id.textView26);
temp_out = rootView.findViewById(R.id.textView28);
Press_out = rootView.findViewById(R.id.textView29);
Humid_out = rootView.findViewById(R.id.textView30);
Ws_out = rootView.findViewById(R.id.textView33);
Visi_out = rootView.findViewById(R.id.textView34);
Cloud_out = rootView.findViewById(R.id.textView35);
getWeatherData("Blah blah blah");
return rootView;
}
private void getWeatherData(String name) {
ApiInterface apiInterface = ApiClient.getClient().create(ApiInterface.class);
Call<Example> call = apiInterface.getWeatherData(name);
call.enqueue(new Callback<Example>() {
@Override
public void onResponse(@NotNull Call<Example> call,@NotNull Response<Example> response) {
current_temp.setText(response.body().getMain().getTemp() + " ℃");
current_output.setText(response.body().getWeatherList().get(0).getDescription());
rise_time.setText(response.body().getSys().getSunrise() + " ");
set_time.setText(response.body().getSys().getSunset() + " ");
temp_out.setText(response.body().getMain().getTemp() + " ℃");
Press_out.setText(response.body().getMain().getPressure() + " hpa");
Humid_out.setText(response.body().getMain().getHumidity() + " %");
Ws_out.setText(response.body().getWind().getSpeed() + " Km/h");
Visi_out.setText(response.body().getVisibility() + " m");
Cloud_out.setText(response.body().getClouds().getAll()+ " %");
}
@Override
public void onFailure(@NotNull Call<Example> call,@NotNull Throwable t) {
t.printStackTrace();
}
});
}
}
另外，如果您想从您的片段访问您的活动小部件，您可以使用：
editText editText = getActivity().findViewById(R.id.textfield);
editText.getText().toString()