标记上的索引值问题

Question

我想在 fcmUsers 列表中的标记上显示这些值

当用户点击标记时，它将在 fcmUsers 列表的文本视图中显示自己的值或数据

fcmUsers 列表有 public Long createdat;和 public Long hajjappnum;

DatabaseReference UserRef = FirebaseDatabase.getInstance().getReference().child("GPSLocationHistory").child("DevicesLatest");
UserRef.keepSynced(true);
new GetDataFromFirebase().executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);


FirebaseDatabase database = FirebaseDatabase.getInstance();

//  myRef = database.getReference("GPSLocationHistory/DevicesLatest");


UserRef.addValueEventListener(new ValueEventListener() {
    @Override
    public void onDataChange(DataSnapshot dataSnapshot) {
        latLngList.clear();
        mMap.clear();
        if (marker != null) {
            marker.remove();
        }
        Toast.makeText(MapsActivity.this, "change", Toast.LENGTH_SHORT).show();
        Iterator<DataSnapshot> dataSnapshots = dataSnapshot.getChildren().iterator();
         fcmUsers = new ArrayList<>();
         i = 0;
        while (dataSnapshots.hasNext()) {
            DataSnapshot dataSnapshotChild = dataSnapshots.next();
            ModelClassFireBase fcmUser = dataSnapshotChild.getValue(ModelClassFireBase.class);
            fcmUsers.add(fcmUser);
            LatLng latLng = new LatLng(Double.parseDouble(fcmUsers.get(i).lati.toString()), Double.parseDouble(fcmUsers.get(i).longi.toString())); // Use your server's methods
            latLngList.add(latLng);
            mark1 = mMap.addMarker(new MarkerOptions().title(fcmUsers.get(i).Battery.toString()).position(latLngList.get(i)));//.icon(BitmapDescriptorFactory.fromResource(R.drawable.female4)));
            // Toast.makeText(getApplicationContext(), uniqueids.get(i).toString(), Toast.LENGTH_LONG).show();
            markerList.add(mark1);


            i++;

            if (fcmUsers.size() > 0) {

            } else {
                // Display dialog for there is no user available.
            }

        }


    }

    @Override
    public void onCancelled(DatabaseError databaseError) {
        // for handling database error
    }
});
mMap.setInfoWindowAdapter(new GoogleMap.InfoWindowAdapter() {
    @Override
    public View getInfoWindow(Marker arg0) {
        return null;
    }

    // Defines the contents of the InfoWindow
    @Override
    public View getInfoContents(Marker arg0) {

        // Getting view from the layout file info_window_layout
        View v = getLayoutInflater().inflate(R.layout.info_widow_layout, null);

        // Getting the position from the marker
        LatLng latLng = arg0.getPosition();

        // Getting reference to the TextView to set latitude
        TextView userbattery = (TextView) v.findViewById(R.id.tv_lat);

        // Getting reference to the TextView to set longitude
       // TextView tvLng = (TextView) v.findViewById(R.id.tv_lng);
       // ImageView userimage = (ImageView) v.findViewById(R.id.userimage);


        userbattery.setText("user battery:" + fcmUsers.get(i-1).Battery.toString());

        return v;

    }

});

Answer 1

首先，我看不出您需要将 Arraylist 存储在 Firebase 方法之外的原因。我认为您应该删除它们和 i 变量。

如果你确实需要列表，它们应该只从onDataChange开始初始化

其次，您的标记目前仅显示电池。

new MarkerOptions().title(fcmUsers.get(i).Battery.toString())

您可以为要显示的数据创建一个字符串变量，然后替换它。

---

如果您想使用标记存储整个对象，请使用标签。

final ModelClassFireBase fcmUser = dataSnapshotChild.getValue(ModelClassFireBase.class);
Marker mark = mMap.addMarker(new MarkerOptions()
    .title(user.getBattery())
    .position(new LatLng(user.getLatitude(), user.getLongitude());
mark.setTag(user);

在下方，获取标签

final ModelClassFireBase user = ((ModelClassFireBase) arg0).getTag();
userbattery.setText("user battery:" + user.getBattery());

你不能在这个地方使用get(i)，因为那不是那个标记的实际位置