Question

我希望用户在Firebase数据库中添加和保存标记。我不确定如何做到这一点，我目前让用户添加标记并保存它，但它不会出现在其他用户应用程序上。

public void onMapLongClick(final LatLng latLng) {
    LayoutInflater li = LayoutInflater.from(context);
    final View v = li.inflate(R.layout.alert_layout, null);
    AlertDialog.Builder builder = new AlertDialog.Builder(context);
    builder.setView(v);
    builder.setCancelable(false);

    builder.setPositiveButton("Create", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {
            EditText title = (EditText)v.findViewById(R.id.ettittle);
            EditText snittle = (EditText)v.findViewById(R.id.etsnittle);

            Marker marker0 = mMap.addMarker(new MarkerOptions()
                    .position(latLng)
                    .title(title.getText().toString()).snippet(snittle.getText().toString())
                    .icon(BitmapDescriptorFactory.fromResource(R.drawable.tackshops)));
            hash.put(marker0, R.drawable.agriculture);
            prefs.edit().putString("Lat",String.valueOf(latLng.latitude)).apply();
            prefs.edit().putString("Lng",String.valueOf(latLng.longitude)).apply();

            locationCount++;



            editor.putString("title"+(locationCount-1), title.getText().toString());
            editor.putString("snippet"+(locationCount-1),snittle.getText().toString());




        }
    });

这是我在Firebase数据库中保存标记的方法

private void drawMarker(final LatLng latLng){


    myRef.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            // This method is called once with the initial value and again
            // whenever data at this location is updated.
            for (DataSnapshot userSnapshot : dataSnapshot.getChildren()) {
                Agriculture marker = userSnapshot.getValue(Agriculture.class);

                mMap.addMarker(new MarkerOptions().position(latLng))
                        .setIcon(BitmapDescriptorFactory.fromResource(R.drawable.tackshops));
            }
        }

        @Override
        public void onCancelled(DatabaseError databaseError) {
            // Failed to read value


        }
    });

Answer 1

您应该在Firebase上保存您所在位置的坐标（Lat Long）。然后，您可以在地图上检索并显示标记。 Firebase Realtime Database这将告诉您如何保存和检索数据。

Answer 2

将数据保存到FireBase中：

DatabaseReference databaseReference = FirebaseDatabase.getInstance().getReference();

databaseReference.child("Sample_My_Location").push().setValue(l);

您可以在https://console.firebase.google.com/的FireBase控制台上将您的数据视为JSON结构。

确保您已在项目中成功设置了firebase。点击https://codelabs.developers.google.com/codelabs/firebase-android/#0

Answer 3

MarkerOptions m2,m2;

Map<String, Object> objectMap = new HashMap<>();
        objectMap.put("Marcador de partida", m1);
        objectMap.put("Marcador de destino",m2);


//And to retrieve it

mDataBase.child("your_databade_child).addValueEventListener(new ValueEventListener(){

@Override
public void onDataChange(DataSnapshot p1)
{
    if(p1.exists()){

        String textRetrieved = p1.child("Marcador de destino/position/latitude").getValue().toString();

     //Use textRetrieved as you please
    }
    else{
        //Set error
    }
    // TODO: Implement this method
}

@Override
public void onCancelled(DatabaseError p1)
{
    // TODO: Implement this method
}
});


}

如何允许用户在Firebase数据库上创建和保存标记

3 个答案: