如何获取Google Map中被点击标记的数据并传递至新Activity？

我明白你现在的困境：你已经成功在地图上加载了公寓标记，但点击信息窗口跳转到新Activity时，没办法拿到该标记对应的完整公寓数据（比如apartmentname、verification这些），只能获取Marker自带的id、title、snippet字段。下面我来帮你一步步解决这个问题。

问题根源 #

你当前的addMarker方法只把category、price存到了Marker的snippet和title属性里，但其他关键数据（比如id、apartmentname、verification）没有和Marker做绑定，所以点击信息窗口时无法直接获取这些完整信息。

解决方案：用Marker的setTag()存储完整数据 #

Google Map的Marker对象提供了setTag()和getTag()方法，可以让你把任意业务对象和Marker绑定，这样点击时就能直接取出完整数据。具体步骤如下：

1. 创建Apartment数据类封装所有信息 #

首先我们定义一个简单的Apartment类，把所有公寓数据封装进去，方便后续存储和获取：

public class Apartment {
    private String id;
    private String verification;
    private String apartmentName;
    private String category;
    private String price;
    private LatLng latLng;

    // 构造方法
    public Apartment(String id, String verification, String apartmentName, String category, String price, LatLng latLng) {
        this.id = id;
        this.verification = verification;
        this.apartmentName = apartmentName;
        this.category = category;
        this.price = price;
        this.latLng = latLng;
    }

    // 对应字段的Getter方法
    public String getId() { return id; }
    public String getVerification() { return verification; }
    public String getApartmentName() { return apartmentName; }
    public String getCategory() { return category; }
    public String getPrice() { return price; }
    public LatLng getLatLng() { return latLng; }
}

2. 修改addMarker方法，绑定数据到Marker的Tag #

在getMarkers的循环逻辑里，先创建Apartment对象，然后添加Marker时把这个对象设置为Marker的Tag：

private void addMarker(Apartment apartment) {
    if (mCurrLocationMarker != null) {
        mCurrLocationMarker.remove();
    }

    MarkerOptions markerOptions = new MarkerOptions();
    markerOptions.position(apartment.getLatLng());
    markerOptions.title(apartment.getPrice());
    markerOptions.snippet(apartment.getCategory());
    // 根据verification设置marker图标
    markerOption(apartment.getVerification(), markerOptions);

    // 添加Marker并将Apartment对象绑定到Tag
    Marker marker = mGoogleMap.addMarker(markerOptions);
    marker.setTag(apartment);
}

然后修改getMarkers里的循环代码：

for (int i = 0; i < jsonArray.length(); i++) {
    JSONObject jsonObject = jsonArray.getJSONObject(i);
    verification = jsonObject.getString(VERIFICATION);
    apartmentname = jsonObject.getString(TAG_APARTMENTNAME);
    category = jsonObject.getString(TAG_CATEGORY);
    price = jsonObject.getString(TAG_PRICE);
    id = jsonObject.getString("userID");
    latLng = new LatLng(Double.parseDouble(jsonObject.getString(LAT)), Double.parseDouble(jsonObject.getString(LNG)));

    // 创建Apartment对象并传入所有数据
    Apartment apartment = new Apartment(id, verification, apartmentname, category, price, latLng);
    // 添加Marker并绑定数据
    addMarker(apartment);
}

3. 修改onInfoWindowClick方法，获取数据并传递到新Activity #

现在点击InfoWindow时，就可以通过Marker的Tag拿到完整的Apartment数据，再把需要的字段放到Intent中传递：

@Override
public void onInfoWindowClick(Marker marker) {
    // 从Tag中取出绑定的Apartment对象
    Apartment apartment = (Apartment) marker.getTag();
    if (apartment != null) {
        Intent intent = new Intent(getActivity(), InfoWindowActivity.class);
        // 将需要的数据放入Intent
        intent.putExtra(ID, apartment.getId());
        intent.putExtra(VERIFICATION, apartment.getVerification());
        intent.putExtra(TAG_APARTMENTNAME, apartment.getApartmentName());
        intent.putExtra(TAG_CATEGORY, apartment.getCategory());
        intent.putExtra(TAG_PRICE, apartment.getPrice());
        intent.putExtra(LAT, apartment.getLatLng().latitude);
        intent.putExtra(LNG, apartment.getLatLng().longitude);
        startActivity(intent);
    }
}

4. 在InfoWindowActivity中接收数据 #

在InfoWindowActivity的onCreate方法里，就可以取出这些传递过来的数据：

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

    Intent intent = getIntent();
    String id = intent.getStringExtra(FindApartment.ID);
    String verification = intent.getStringExtra(FindApartment.VERIFICATION);
    String apartmentName = intent.getStringExtra(FindApartment.TAG_APARTMENTNAME);
    // 其他字段同理获取...
}

额外优化：直接传递Apartment对象 #

如果觉得一个个字段传递太繁琐，可以让Apartment类实现Serializable接口，这样就能直接把整个对象放到Intent里：

public class Apartment implements Serializable {
    // 之前的代码保持不变
}

然后修改onInfoWindowClick的代码：

@Override
public void onInfoWindowClick(Marker marker) {
    Apartment apartment = (Apartment) marker.getTag();
    if (apartment != null) {
        Intent intent = new Intent(getActivity(), InfoWindowActivity.class);
        intent.putExtra("APARTMENT_DATA", apartment);
        startActivity(intent);
    }
}

最后在InfoWindowActivity中接收：

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

    Apartment apartment = (Apartment) getIntent().getSerializableExtra("APARTMENT_DATA");
    // 直接使用apartment对象的Getter方法获取数据即可
}

内容的提问来源于stack exchange，提问作者John Bea