Android Activity间传递自定义对象列表：使用Gson库的实践指南

dependencies {
    implementation 'com.google.code.gson:gson:2.10.1' // 使用最新版本
}

public class ListeJoueurs {
    String Nom;
    String Prenom;
    Long Licence;
    String Cat;
    String Select;
    String dteN;
    int imageClick;

    // 构造函数
    public ListeJoueurs(String Nom, String Prenom, Long Licence, String Cat, String Select, String dteN, int imageClick) {
        this.Nom = Nom;
        this.Prenom = Prenom;
        this.Licence = Licence;
        this.Cat = Cat;
        this.Select = Select;
        this.dteN = dteN;
        this.imageClick = imageClick;
    }

    // Getter方法 (可选，但通常推荐添加)
    public String getNom() { return Nom; }
    public String getPrenom() { return Prenom; }
    public Long getLicence() { return Licence; }
    public String getCat() { return Cat; }
    public String getSelect() { return Select; }
    public String getDteN() { return dteN; }
    public int getImageClick() { return imageClick; }

    // toString方法，方便调试
    @Override
    public String toString() {
        return "ListeJoueurs{" +
               "Nom='" + Nom + '\'' +
               ", Prenom='" + Prenom + '\'' +
               ", Licence=" + Licence +
               ", Cat='" + Cat + '\'' +
               ", Select='" + Select + '\'' +
               ", dteN='" + dteN + '\'' +
               ", imageClick=" + imageClick +
               '}';
    }
}

import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import com.google.gson.Gson;
import java.util.ArrayList;

public class SendingActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_sending);

        Button sendButton = findViewById(R.id.send_data_button);
        sendButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // 1. 创建 ArrayList<ListeJoueurs> 实例
                ArrayList<ListeJoueurs> la = new ArrayList<>();
                la.add(new ListeJoueurs("Messi", "Lionel", 10001L, "Forward", "Yes", "1987-06-24", R.drawable.ic_launcher_foreground));
                la.add(new ListeJoueurs("Ronaldo", "Cristiano", 70007L, "Forward", "Yes", "1985-02-05", R.drawable.ic_launcher_background));
                // 可以添加更多对象...

                // 2. 使用 Gson 将 ArrayList 转换为 JSON 字符串
                Gson gson = new Gson();
                String jsonList = gson.toJson(la);

                // 3. 通过 Intent 传递 JSON 字符串
                Intent intent = new Intent(SendingActivity.this, ReceivingActivity.class);
                intent.putExtra("player_list_json", jsonList); // 使用一个唯一的键
                startActivity(intent);
            }
        });
    }
}

import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;
import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;
import java.lang.reflect.Type;
import java.util.ArrayList;

public class ReceivingActivity extends AppCompatActivity {

    private TextView receivedDataTextView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_receiving);

        receivedDataTextView = findViewById(R.id.received_data_text_view);

        // 1. 从 Intent 获取 JSON 字符串
        String jsonList = getIntent().getStringExtra("player_list_json");

        if (jsonList != null && !jsonList.isEmpty()) {
            // 2. 使用 Gson 和 TypeToken 将 JSON 字符串反序列化回 ArrayList<ListeJoueurs>
            Gson gson = new Gson();
            // 定义目标类型，对于泛型集合，需要使用 TypeToken
            Type type = new TypeToken<ArrayList<ListeJoueurs>>() {}.getType();
            ArrayList<ListeJoueurs> receivedList = gson.fromJson(jsonList, type);

            // 3. 处理接收到的 ArrayList
            if (receivedList != null && !receivedList.isEmpty()) {
                StringBuilder sb = new StringBuilder("Received Players:\n");
                for (ListeJoueurs player : receivedList) {
                    sb.append(player.toString()).append("\n");
                }
                receivedDataTextView.setText(sb.toString());
            } else {
                receivedDataTextView.setText("No players received or list is empty.");
            }
        } else {
            receivedDataTextView.setText("No JSON data received.");
        }
    }
}