無法讓我的API資料顯示在其他頁面上-有解無憂

我所做的代碼緊跟在一些 YouTube 教程之后。我正在設計一個帝國時代應用程式，它從公共 API 中獲取資料。當用戶瀏覽頁面時，會顯示 API 資料的不同部分。我想讓它做的是從主要活動（檢索 API 的地方）獲取資料，并將其許多資料中的一些放入 UniqueUnit 頁面。它使用了一種叫做可序列化的東西，我還不太明白它是如何作業的。

作為記錄，它可以從“DetailedCivilization”頁面獲取資料，但在“UniqueUnit”頁面上完全中斷。

主活動.java

package com.example.ageofempires2;

import ...


public class MainActivity extends AppCompatActivity {
    public static final String TAG = "tag";
    RecyclerView itemList;
    Adapter adapter;
    List<Civilizations> all_civilizations;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        getSupportActionBar().setTitle("Civilizations menu");
        all_civilizations = new ArrayList<>();
        itemList = findViewById(R.id.itemList);
        itemList.setLayoutManager(new LinearLayoutManager(this));
        adapter = new Adapter(this, all_civilizations);
        itemList.setAdapter(adapter);

        getJsonData();

    }

    private void getJsonData() {
        String URL = "https://age-of-empires-2-api.herokuapp.com/api/v1/civilizations";
        RequestQueue requestQueue = Volley.newRequestQueue(this);
        JsonObjectRequest objectRequest = new JsonObjectRequest(Request.Method.GET, URL, null, new Response.Listener<JSONObject>() {
            @Override
            public void onResponse(JSONObject response) {
                try {
                    JSONArray civilizations = response.getJSONArray("civilizations");
                    JSONObject civilizationsData = civilizations.getJSONObject(0);

                    Log.d(TAG, "onResponse "  civilizationsData);

                    for (int i=0; i< civilizationsData.length();i  ){
                        JSONObject civilization = civilizations.getJSONObject(i);
                        Civilizations v = new Civilizations();

                        v.setName(civilization.getString("name"));
                        v.setArmy_type(civilization.getString("army_type"));
                        v.setExpansion(civilization.getString("expansion"));
                        v.setCivilization_bonus(civilization.getString("civilization_bonus"));
                        v.setUnique_unit(civilization.getString("unique_unit"));

                        all_civilizations.add(v);
                        adapter.notifyDataSetChanged();
                    }

                } catch (JSONException e) {
                    e.printStackTrace();
                }
            }
        }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                Log.d(TAG, "onErrorResponse"   error.getMessage());
            }
        });
        requestQueue.add(objectRequest);
    }
}

配接器.java

     package com.example.ageofempires2;
        
          import ...
        
        public class Adapter extends RecyclerView.Adapter<Adapter.ViewHolder> {
            private List<Civilizations> allCivilizations;
            private Context context;
        
            public Adapter(Context ctx, List<Civilizations> civilizationsData){
                this.allCivilizations = civilizationsData;
                this.context = ctx;
            }
        
            @NonNull
            @Override
            public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
                View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.civilization_view,parent,false);
                return new ViewHolder(v);
            }
            @Override
            public void onBindViewHolder(@NonNull ViewHolder holder, final int position) {
                holder.titleName.setText(allCivilizations.get(position).getName());
        
                holder.vv.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        Bundle b = new Bundle();
                        b.putSerializable("civilizationsData", allCivilizations.get(position));
                        Intent i = new Intent(context, DetailedCivilization.class);
                        i.putExtras(b);
                        v.getContext().startActivity(i);
                    }
                });
        
            }
        
            @Override
            public int getItemCount() {
                return allCivilizations.size();
            }
        
            public class ViewHolder extends  RecyclerView.ViewHolder{
                TextView titleName;
                TextView expansionName;
                View vv;
                public ViewHolder(@NonNull View itemView) {
                    super(itemView);
        
                    titleName = itemView.findViewById(R.id.civilizationUniqueUnits);
                    expansionName = itemView.findViewById(R.id.civilizationUnitDescription);
                    vv = itemView;
        
        
                }
            }
        }

文明.java

    package com.example.ageofempires2;
    
    import java.io.Serializable;
    
    public class Civilizations implements Serializable {
        private String name;
        private String expansion;
        private String army_type;
        private String civilization_bonus;
        private String unique_unit;
    
        public String getName() {
            return name;
        }
    
        public void setName(String name) {
            this.name = name;
        }
    
        public String getExpansion() {
            return expansion;
        }
    
        public void setExpansion(String expansion) {
            this.expansion = expansion;
        }
    
        public String getArmy_type() {
            return army_type;
        }
    
        public void setArmy_type(String army_type) {
            this.army_type = army_type;
        }
    
        public String getCivilization_bonus() {
            return civilization_bonus;
        }
    
        public void setCivilization_bonus(String civilization_bonus) {this.civilization_bonus = civilization_bonus; }
    
        public String getUnique_unit() {
            return unique_unit;
        }
    
        public void setUnique_unit(String unique_unit) {this.unique_unit = unique_unit; }
    
    
    }

唯一單位.java

package com.example.ageofempires2;

    import ...


public class UniqueUnit extends AppCompatActivity {

    public static final String TAG = "TAG";


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_unique_unit);
        getSupportActionBar().setTitle("Unique Unit");
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);

        Intent incomingIntent = getIntent();
        Bundle incomingName = incomingIntent.getExtras();
        Civilizations v = (Civilizations) incomingName.getSerializable("civilizationsData");
        Log.d(TAG, "onCreate: IDK MAN IT SHOULD WORK??"  incomingName);
        TextView unit = findViewById(R.id.civilizationUnitDescription);
        unit.setText(v.getUnique_unit());
    }
}

文明詳解.java

package com.example.ageofempires2;

    import ...


public class DetailedCivilization extends AppCompatActivity {

    public static final String TAG = "TAG";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_detailed_civilization);
        getSupportActionBar().setTitle("Detailed view");
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);

        Intent i = getIntent();
        Bundle data = i.getExtras();
        Civilizations v = (Civilizations) data.getSerializable("civilizationsData");

        TextView type = findViewById(R.id.civilizationType);
        type.setText(v.getArmy_type());

        TextView title = findViewById(R.id.civilizationUniqueUnits);
        title.setText(v.getName());

        TextView expansions = findViewById(R.id.civilizationUnitDescription);
        expansions.setText(v.getExpansion());

        TextView bonus = findViewById(R.id.civilizationBonus);
        bonus.setText(v.getCivilization_bonus());

        Button changeActivityTech = findViewById(R.id.tech_button);
        Button changeActivityUnit = findViewById(R.id.unit_button);
        changeActivityTech.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                activityTech();
            }
        });
        changeActivityUnit.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                activityUnit();
            }
        });
    }
    private void activityTech(){
        Intent intent = new Intent(this, UniqueTech.class);
        startActivity(intent);
    }
    private void activityUnit(){
        Intent intent = new Intent(this, UniqueUnit.class);
        startActivity(intent);
    }

    @Override
    public boolean onOptionsItemSelected(@NonNull MenuItem item) {
        if(item.getItemId() == android.R.id.home){
            onBackPressed();
        }
        return super.onOptionsItemSelected(item);
    }

}

uj5u.com熱心網友回復：

解決方案是

private void activityUnit(Civilizations civ){
        Bundle b = new Bundle();
        b.putSerializable("civilizationsData", civ)
        Intent intent = new Intent(this, UniqueUnit.class);
        intent.putExtras(b);
        startActivity(intent);
}

在DetailedCivilization.java 中將v行重命名Civilizations v = (Civilizations) incomingName.getSerializable("civilizationsData");為civ或更具描述性的內容

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_detailed_civilization);
        getSupportActionBar().setTitle("Detailed view");
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);

        Intent i = getIntent();
        Bundle data = i.getExtras();
        Civilizations civ = (Civilizations) data.getSerializable("civilizationsData");

        TextView type = findViewById(R.id.civilizationType);
        type.setText(v.getArmy_type());

        TextView title = findViewById(R.id.civilizationUniqueUnits);
        title.setText(v.getName());

        TextView expansions = findViewById(R.id.civilizationUnitDescription);
        expansions.setText(v.getExpansion());

        TextView bonus = findViewById(R.id.civilizationBonus);
        bonus.setText(v.getCivilization_bonus());

        Button changeActivityTech = findViewById(R.id.tech_button);
        Button changeActivityUnit = findViewById(R.id.unit_button);
        changeActivityTech.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                activityTech();
            }
        });
        changeActivityUnit.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                activityUnit(civ);
            }
        });
    }

Civilizations當你呼叫activityUnit函式時傳遞

基本上，你忘了傳遞Civilizations，當你走的時候DetailedCivilization.java到UniqueUnits.java

轉載請註明出處，本文鏈接：https://www.uj5u.com/yidong/359227.html

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