Please tell findFragmentById(R.id.map); how to make findFragmentById(R.id.map); took the resource from the layout connected in LayoutInflater .

 myButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { View view = LayoutInflater.from(MainActivity.this).inflate(R.layout.address, null); final Dialog dialog = new Dialog(MainActivity.this); dialog.setTitle("Address"); dialog.setContentView(view); dialog.show(); Button close = (Button) dialog.findViewById(R.id.btnClose); Button save = (Button) dialog.findViewById(R.id.btnSave); close.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { dialog.cancel(); } }); save.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { dialog.cancel(); } }); SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager() .findFragmentById(R.id.map); mapFragment.getMapAsync(new OnMapReadyCallback() { @Override public void onMapReady(GoogleMap googleMap) { LatLng sydney = new LatLng(-34, 151); googleMap.addMarker(new MarkerOptions().position(sydney).title("Marker in Sydney")); googleMap.moveCamera(CameraUpdateFactory.newLatLng(sydney)); } }); } });

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