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將 java 從 MainActivity.java 移動到 HomeFragment.java 導致錯誤認為相同的代碼

[英]Moving java from MainActivity.java to HomeFragment.java causing errors thought the same code

 原文  2020-12-03 14:29:50  7   1    java/ android/ android-studio/ android-fragments

問題描述

我最近創建了一個帶有底部導航模板的新應用程序。 我將代碼放在 activity_main.xml 和 MainActivity.java 文件中。 但我意識到，我想把它們放在 fragment_home.xml 文件和 HomeFragment.java 中的 java 中。 All the XML was only a button and a textView, so I copied and pasted those in the fragment_home.xml file but it wasn't so easy to copy th java from the MainActivity.java to the HomeFragment.java. 這是第一次使用底部導航模板，我不確定將代碼放在哪里，在 MainAtivity.java 中工作的代碼在 HomeFragment.java 文件中顯示紅線。 由於我沒有使用片段及其專用語法的經驗，因此我在這里尋求幫助。 我希望有人更有經驗，可以幫助我將代碼從 MainAcitivity 移動到 HomeFragment，而不會出現錯誤。 所以這里是代碼。

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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:paddingTop="?attr/actionBarSize"

    >

    <com.google.android.material.bottomnavigation.BottomNavigationView
        android:id="@+id/nav_view"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="0dp"
        android:layout_marginEnd="0dp"
        android:background="?android:attr/windowBackground"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:menu="@menu/bottom_nav_menu" />

    <fragment
        android:id="@+id/nav_host_fragment"
        android:name="androidx.navigation.fragment.NavHostFragment"
        android:layout_width="408dp"
        android:layout_height="742dp"
        app:defaultNavHost="true"
        app:layout_constraintBottom_toTopOf="@id/nav_view"
        app:layout_constraintHorizontal_bias="0.333"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.0"
        app:navGraph="@navigation/mobile_navigation" />

    <TextView
        android:id="@+id/text_view_result"
        android:layout_width="194dp"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:textColor="#0A0A0A"
        app:layout_constraintBottom_toTopOf="@+id/nav_view"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.497"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.287" />

    <Button
        android:id="@+id/button_parse"
        android:layout_width="194dp"
        android:layout_height="71dp"
        android:text="Parse"
        app:layout_constraintBottom_toTopOf="@+id/nav_view"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.497"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="@+id/nav_host_fragment"
        app:layout_constraintVertical_bias="0.419" />

</androidx.constraintlayout.widget.ConstraintLayout>

MainActivity.java：

package com.example.spoonacular;

import android.app.VoiceInteractor;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.VolleyLog;
import com.android.volley.toolbox.JsonArrayRequest;
import com.android.volley.toolbox.JsonObjectRequest;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;
import com.google.android.material.bottomnavigation.BottomNavigationView;

import androidx.appcompat.app.AppCompatActivity;
import androidx.navigation.NavController;
import androidx.navigation.Navigation;
import androidx.navigation.ui.AppBarConfiguration;
import androidx.navigation.ui.NavigationUI;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import java.lang.reflect.Array;
import java.net.URL;

public class MainActivity extends AppCompatActivity {
    private TextView mTextViewResult;
    private RequestQueue mQueue;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        BottomNavigationView navView = findViewById(R.id.nav_view);
        // Passing each menu ID as a set of Ids because each
        // menu should be considered as top level destinations.
        AppBarConfiguration appBarConfiguration = new AppBarConfiguration.Builder(
                R.id.navigation_home, R.id.navigation_dashboard, R.id.navigation_notifications)
                .build();
        NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment);
        NavigationUI.setupActionBarWithNavController(this, navController, appBarConfiguration);
        NavigationUI.setupWithNavController(navView, navController);
        mTextViewResult = findViewById(R.id.text_view_result);
        Button buttonParse = findViewById(R.id.button_parse);

        mQueue = Volley.newRequestQueue(this);

        buttonParse.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                jsonParse();
            }
        });
    }

    private void jsonParse() {
        String url = "https://api.spoonacular.com/recipes/random?number=1&tags=vegetarian,dessert&apiKey=86912d6bb1474577a76513e236a8a58e";
        JsonObjectRequest request = new JsonObjectRequest(Request.Method.GET, url, null,
                new Response.Listener<JSONObject>() {
                    @Override
                    public void onResponse(JSONObject response) {
                        try {
                            JSONArray jsonArray = response.getJSONArray("recipes");
                            for (int i = 0; i < jsonArray.length(); i++) {
                                JSONObject recipes = jsonArray.getJSONObject(i);

                                Boolean vegetarian = recipes.getBoolean("vegetarian");
                                Boolean vegan = recipes.getBoolean("vegan");
                                Boolean glutenFree = recipes.getBoolean("glutenFree");
                                Boolean dairyFree = recipes.getBoolean("dairyFree");
                                Boolean veryHealthy = recipes.getBoolean("veryHealthy");
                                Boolean cheap = recipes.getBoolean("cheap");
                                Boolean veryPopular = recipes.getBoolean("veryPopular");
                                Boolean sustainable = recipes.getBoolean("sustainable");
                                Boolean lowFodmap = recipes.getBoolean("lowFodmap");
                                int weightWatcherSmartPoints = recipes.getInt("weightWatcherSmartPoints");
                                int spoonacularScore = recipes.getInt("spoonacularScore");
                                int healthScore = recipes.getInt("healthScore");
                                int pricePerServing = recipes.getInt("pricePerServing");
                                int likes = recipes.getInt("aggregateLikes");
                                String gaps = recipes.getString("gaps");
                                String source = recipes.getString("sourceName");
                                mTextViewResult.setText("Vegetarian: " + vegetarian + "\n\n"+ "Vegan: " + vegan + "\n\n" + "Gluten Free: " + glutenFree + "\n\n" + "Dairy Free: "  + dairyFree + "\n\n" + "Very Healthy: " + veryHealthy + "\n\n"+ "Cheap: " + cheap + "\n\n" + "Very Popular: " + veryPopular + "\n\n" + "Sustainable: "  + sustainable + "\n\n" + "Low Fod Map: " + lowFodmap + "\n\n" + "Weight Watcher Points: "  +  String.valueOf(weightWatcherSmartPoints) + "\n\n" + "Spoonacular Score: "  + String.valueOf(spoonacularScore) + "\n\n" + "Health Score: "  + String.valueOf(healthScore) + "\n\n" + "Price Per Serving: "  + String.valueOf(pricePerServing) + "\n\n" + "Likes: " + String.valueOf(likes) + "\n\n");
                            }
                        } catch (JSONException e) {
                            e.printStackTrace();
                        }
                    }
                }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                error.printStackTrace();
            }
        });
        mQueue.add(request);
    }
}

移動到 fragment_home.xml 和 homefragment java 文件。 請注意，從這里開始沒有代碼是我寫的，這些是從底部導航模板預編碼的默認值。

fragment_home.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".ui.home.HomeFragment">

    <TextView
        android:id="@+id/text_home"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="8dp"
        android:textAlignment="center"
        android:textSize="20sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

HomeFragment.java 文件，

package com.example.spoonacular.ui.home;

import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import androidx.lifecycle.Observer;
import androidx.lifecycle.ViewModelProvider;

import com.example.spoonacular.R;

public class HomeFragment extends Fragment {

    private HomeViewModel homeViewModel;

    public View onCreateView(@NonNull LayoutInflater inflater,
                             ViewGroup container, Bundle savedInstanceState) {
        homeViewModel =
                new ViewModelProvider(this).get(HomeViewModel.class);
        View root = inflater.inflate(R.layout.fragment_home, container, false);
        final TextView textView = root.findViewById(R.id.text_home);
        homeViewModel.getText().observe(getViewLifecycleOwner(), new Observer<String>() {
            @Override
            public void onChanged(@Nullable String s) {
                textView.setText(s);
            }
        });
        return root;
    }
}

而且因為顯示 HomeViewModel 文件也可能很有用，（盡管如果有人可以向我解釋 HomeViewModel.java 和 HomeFragment.java 之間的區別，我們將不勝感激）

主頁查看型號.java

package com.example.spoonacular.ui.home;

import androidx.lifecycle.LiveData;
import androidx.lifecycle.MutableLiveData;
import androidx.lifecycle.ViewModel;

public class HomeViewModel extends ViewModel {

    private MutableLiveData<String> mText;

    public HomeViewModel() {
        mText = new MutableLiveData<>();
        mText.setValue("This is home fragment");
    }

    public LiveData<String> getText() {
        return mText;
    }
}

我知道這是一個很長的問題，可能不值得回答，但我無法找到解決方案，這是我最后的希望。 我已准備好回答任何問題（並支持並接受可行的解決方案）謝謝您的幫助！

編輯
MainActivity.java

package com.example.spoonacular;

import android.os.Bundle;

import com.google.android.material.bottomnavigation.BottomNavigationView;

import androidx.appcompat.app.AppCompatActivity;
import androidx.navigation.NavController;
import androidx.navigation.Navigation;
import androidx.navigation.ui.AppBarConfiguration;
import androidx.navigation.ui.NavigationUI;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        BottomNavigationView navView = findViewById(R.id.nav_view);
        // Passing each menu ID as a set of Ids because each
        // menu should be considered as top level destinations.
        AppBarConfiguration appBarConfiguration = new AppBarConfiguration.Builder(
                R.id.navigation_home, R.id.navigation_dashboard, R.id.navigation_notifications)
                .build();
        NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment);
        NavigationUI.setupActionBarWithNavController(this, navController, appBarConfiguration);
        NavigationUI.setupWithNavController(navView, navController);
    }
}

首頁Fragment.java

package com.example.spoonacular.ui.home;

import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.TextView;

import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.JsonObjectRequest;
import com.android.volley.toolbox.Volley;
import com.example.spoonacular.R;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import androidx.lifecycle.Observer;
import androidx.lifecycle.ViewModelProvider;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

public class HomeFragment extends Fragment {

    private TextView mTextViewResult;
    private Button buttonParse;
    private HomeViewModel homeViewModel;
    private RequestQueue mQueue;

    public View onCreateView(@NonNull LayoutInflater inflater,
                             ViewGroup container, Bundle savedInstanceState) {
        homeViewModel =
                new ViewModelProvider(this).get(HomeViewModel.class);
        View root = inflater.inflate(R.layout.fragment_home, container, false);

        mTextViewResult = root.findViewById(R.id.text_view_result);
        buttonParse = root.findViewById(R.id.button_parse);

        mQueue = Volley.newRequestQueue(this);

        buttonParse.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                jsonParse();
            }
        });


        homeViewModel.getText().observe(getViewLifecycleOwner(), new Observer<String>() {
            @Override
            public void onChanged(@Nullable String s) {
                mTextViewResult.setText(s);
            }
        });
        return root;
    }

    private void jsonParse() {
        String url = "https://api.spoonacular.com/recipes/random?number=1&tags=vegetarian,dessert&apiKey=86912d6bb1474577a76513e236a8a58e";
        JsonObjectRequest request = new JsonObjectRequest(Request.Method.GET, url, null,
                new Response.Listener<JSONObject>() {
                    @Override
                    public void onResponse(JSONObject response) {
                        try {
                            JSONArray jsonArray = response.getJSONArray("recipes");
                            for (int i = 0; i < jsonArray.length(); i++) {
                                JSONObject recipes = jsonArray.getJSONObject(i);

                                Boolean vegetarian = recipes.getBoolean("vegetarian");
                                Boolean vegan = recipes.getBoolean("vegan");
                                Boolean glutenFree = recipes.getBoolean("glutenFree");
                                Boolean dairyFree = recipes.getBoolean("dairyFree");
                                Boolean veryHealthy = recipes.getBoolean("veryHealthy");
                                Boolean cheap = recipes.getBoolean("cheap");
                                Boolean veryPopular = recipes.getBoolean("veryPopular");
                                Boolean sustainable = recipes.getBoolean("sustainable");
                                Boolean lowFodmap = recipes.getBoolean("lowFodmap");
                                int weightWatcherSmartPoints = recipes.getInt("weightWatcherSmartPoints");
                                int spoonacularScore = recipes.getInt("spoonacularScore");
                                int healthScore = recipes.getInt("healthScore");
                                int pricePerServing = recipes.getInt("pricePerServing");
                                int likes = recipes.getInt("aggregateLikes");
                                String gaps = recipes.getString("gaps");
                                String source = recipes.getString("sourceName");
                                mTextViewResult.setText("Vegetarian: " + vegetarian + "\n\n" + "Vegan: " + vegan + "\n\n" + "Gluten Free: " + glutenFree + "\n\n" + "Dairy Free: " + dairyFree + "\n\n" + "Very Healthy: " + veryHealthy + "\n\n" + "Cheap: " + cheap + "\n\n" + "Very Popular: " + veryPopular + "\n\n" + "Sustainable: " + sustainable + "\n\n" + "Low Fod Map: " + lowFodmap + "\n\n" + "Weight Watcher Points: " + String.valueOf(weightWatcherSmartPoints) + "\n\n" + "Spoonacular Score: " + String.valueOf(spoonacularScore) + "\n\n" + "Health Score: " + String.valueOf(healthScore) + "\n\n" + "Price Per Serving: " + String.valueOf(pricePerServing) + "\n\n" + "Likes: " + String.valueOf(likes) + "\n\n");
                            }
                        } catch (JSONException e) {
                            e.printStackTrace();
                        }
                    }
                }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                error.printStackTrace();
            }
        });
        mQueue.add(request);
    }
}

fragment_home.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".ui.home.HomeFragment">

    <TextView
        android:id="@+id/text_home"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="8dp"
        android:textAlignment="center"
        android:textSize="20sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
    <TextView
        android:id="@+id/text_view_result"
        android:layout_width="194dp"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:textColor="#0A0A0A"
        app:layout_constraintBottom_toTopOf="@+id/nav_view"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.497"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.287" />

    <Button
        android:id="@+id/button_parse"
        android:layout_width="194dp"
        android:layout_height="71dp"
        android:text="Parse"
        app:layout_constraintBottom_toTopOf="@+id/nav_view"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.497"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="@+id/nav_host_fragment"
        app:layout_constraintVertical_bias="0.419" />
</androidx.constraintlayout.widget.ConstraintLayout>

Activity_Main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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:paddingTop="?attr/actionBarSize"

    >

    <com.google.android.material.bottomnavigation.BottomNavigationView
        android:id="@+id/nav_view"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="0dp"
        android:layout_marginEnd="0dp"
        android:background="?android:attr/windowBackground"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:menu="@menu/bottom_nav_menu" />

    <fragment
        android:id="@+id/nav_host_fragment"
        android:name="androidx.navigation.fragment.NavHostFragment"
        android:layout_width="408dp"
        android:layout_height="742dp"
        app:defaultNavHost="true"
        app:layout_constraintBottom_toTopOf="@id/nav_view"
        app:layout_constraintHorizontal_bias="0.333"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.0"
        app:navGraph="@navigation/mobile_navigation" />



</androidx.constraintlayout.widget.ConstraintLayout>

HomeFragment.java 中仍有錯誤
第 44 行

        mQueue = Volley.newRequestQueue(this);

在此處輸入圖像描述

1 個解決方案

解決方案1
 1 已采納  2020-12-03 15:00:07

我不知道，我只是將一些文本從MainActivity復制到HomeFragment 。

主要活動

package com.example.spoonacular;

import android.os.Bundle;

import com.google.android.material.bottomnavigation.BottomNavigationView;

import androidx.appcompat.app.AppCompatActivity;
import androidx.navigation.NavController;
import androidx.navigation.Navigation;
import androidx.navigation.ui.AppBarConfiguration;
import androidx.navigation.ui.NavigationUI;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        BottomNavigationView navView = findViewById(R.id.nav_view);
        // Passing each menu ID as a set of Ids because each
        // menu should be considered as top level destinations.
        AppBarConfiguration appBarConfiguration = new AppBarConfiguration.Builder(
                R.id.navigation_home, R.id.navigation_dashboard, R.id.navigation_notifications)
                .build();
        NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment);
        NavigationUI.setupActionBarWithNavController(this, navController, appBarConfiguration);
        NavigationUI.setupWithNavController(navView, navController);
    }
}

首頁片段

package com.example.spoonacular.ui.home;

import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.TextView;

import com.example.spoonacular.R;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import androidx.lifecycle.Observer;
import androidx.lifecycle.ViewModelProvider;

public class HomeFragment extends Fragment {

    private TextView mTextViewResult;
    private Button buttonParse;
    private HomeViewModel homeViewModel;
    private RequestQueue mQueue;

    public View onCreateView(@NonNull LayoutInflater inflater,
                             ViewGroup container, Bundle savedInstanceState) {
        homeViewModel =
                new ViewModelProvider(this).get(HomeViewModel.class);
        View root = inflater.inflate(R.layout.fragment_home, container, false);

        mTextViewResult = root.findViewById(R.id.text_view_result);
        buttonParse = root.findViewById(R.id.button_parse);

        mQueue = Volley.newRequestQueue(this);

        buttonParse.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                jsonParse();
            }
        });


        homeViewModel.getText().observe(getViewLifecycleOwner(), new Observer<String>() {
            @Override
            public void onChanged(@Nullable String s) {
                mTextViewResult.setText(s);
            }
        });
        return root;
    }

    private void jsonParse() {
        String url = "https://api.spoonacular.com/recipes/random?number=1&tags=vegetarian,dessert&apiKey=86912d6bb1474577a76513e236a8a58e";
        JsonObjectRequest request = new JsonObjectRequest(Request.Method.GET, url, null,
                new Response.Listener<JSONObject>() {
                    @Override
                    public void onResponse(JSONObject response) {
                        try {
                            JSONArray jsonArray = response.getJSONArray("recipes");
                            for (int i = 0; i < jsonArray.length(); i++) {
                                JSONObject recipes = jsonArray.getJSONObject(i);

                                Boolean vegetarian = recipes.getBoolean("vegetarian");
                                Boolean vegan = recipes.getBoolean("vegan");
                                Boolean glutenFree = recipes.getBoolean("glutenFree");
                                Boolean dairyFree = recipes.getBoolean("dairyFree");
                                Boolean veryHealthy = recipes.getBoolean("veryHealthy");
                                Boolean cheap = recipes.getBoolean("cheap");
                                Boolean veryPopular = recipes.getBoolean("veryPopular");
                                Boolean sustainable = recipes.getBoolean("sustainable");
                                Boolean lowFodmap = recipes.getBoolean("lowFodmap");
                                int weightWatcherSmartPoints = recipes.getInt("weightWatcherSmartPoints");
                                int spoonacularScore = recipes.getInt("spoonacularScore");
                                int healthScore = recipes.getInt("healthScore");
                                int pricePerServing = recipes.getInt("pricePerServing");
                                int likes = recipes.getInt("aggregateLikes");
                                String gaps = recipes.getString("gaps");
                                String source = recipes.getString("sourceName");
                                mTextViewResult.setText("Vegetarian: " + vegetarian + "\n\n" + "Vegan: " + vegan + "\n\n" + "Gluten Free: " + glutenFree + "\n\n" + "Dairy Free: " + dairyFree + "\n\n" + "Very Healthy: " + veryHealthy + "\n\n" + "Cheap: " + cheap + "\n\n" + "Very Popular: " + veryPopular + "\n\n" + "Sustainable: " + sustainable + "\n\n" + "Low Fod Map: " + lowFodmap + "\n\n" + "Weight Watcher Points: " + String.valueOf(weightWatcherSmartPoints) + "\n\n" + "Spoonacular Score: " + String.valueOf(spoonacularScore) + "\n\n" + "Health Score: " + String.valueOf(healthScore) + "\n\n" + "Price Per Serving: " + String.valueOf(pricePerServing) + "\n\n" + "Likes: " + String.valueOf(likes) + "\n\n");
                            }
                        } catch (JSONException e) {
                            e.printStackTrace();
                        }
                    }
                }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                error.printStackTrace();
            }
        });
        mQueue.add(request);
    }
}

活動主

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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:paddingTop="?attr/actionBarSize"
    >

    <com.google.android.material.bottomnavigation.BottomNavigationView
        android:id="@+id/nav_view"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="0dp"
        android:layout_marginEnd="0dp"
        android:background="?android:attr/windowBackground"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:menu="@menu/bottom_nav_menu" />

    <fragment
        android:id="@+id/nav_host_fragment"
        android:name="androidx.navigation.fragment.NavHostFragment"
        android:layout_width="408dp"
        android:layout_height="742dp"
        app:defaultNavHost="true"
        app:layout_constraintBottom_toTopOf="@id/nav_view"
        app:layout_constraintHorizontal_bias="0.333"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.0"
        app:navGraph="@navigation/mobile_navigation" />

</androidx.constraintlayout.widget.ConstraintLayout>

片段主頁

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    >

    <TextView
        android:id="@+id/text_view_result"
        android:layout_width="194dp"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:textColor="#0A0A0A"
        app:layout_constraintBottom_toTopOf="@+id/nav_view"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.497"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.287"
        tools:text="dfgdfsgdfgdfgd"
        />

    <Button
        android:id="@+id/button_parse"
        android:layout_width="194dp"
        android:layout_height="71dp"
        android:text="Parse"
        app:layout_constraintBottom_toTopOf="@+id/nav_view"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.497"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="@+id/nav_host_fragment"
        app:layout_constraintVertical_bias="0.419"
        />

</LinearLayout>

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