CODEWITHSUNDEEP
androidgoogle-mapsgoogle-maps-android-api-2
axmug
axmug

Reputation: 466

Fragment cannot be loaded in google maps v2

I'm trying to run an app using Google maps v2, but the Logcat shows the error:

Fatal exception: main java.lang.RuntimeException: unable to start activity ComponentInfo{com.app.mapa/com.app.MapaLugares}: android.view.InflatException: java.lang.NullPointerException

Here is the code:

activity_mapa_lugares.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tools="http://schemas.android.com/tools"
 android:layout_width="match_parent"
 android:layout_height="match_parent" >

 <fragment
    android:id="@+id/map"
    android:name="com.google.android.gms.maps.SupportMapFragment"
    android:layout_width="match_parent"
    android:layout_height="match_parent"/>

 </LinearLayout>

MapaLugares.java

package com.app.mapa;

import android.os.Bundle;
import android.app.Activity; 
import android.graphics.Point;
import android.view.Menu;
import android.widget.Toast;

import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.GoogleMap.OnMapClickListener;
import com.google.android.gms.maps.MapFragment;
import com.google.android.gms.maps.Projection;
import com.google.android.gms.maps.model.LatLng;

public class MapaLugares extends FragmentActivity {

private GoogleMap mMap;

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

 mMap = ((MapFragment) getFragmentManager().findFragmentById (R.id.mapa)).
     getMap();

 mMap.setOnMapClickListener(new OnMapClickListener() {

    @Override
    public void onMapClick(LatLng point) {
      Projection proj = mMap.getProjection();
      Point coord = proj.toScreenLocation(point);

              Toast.makeText(MapaLugares.this, "Click\n" + "Lat: " + 
              point.latitude + "\n" + "Lng: "+ point.longitude+ "\n" + "X: "    
              + coord.x + " - Y: "+ coord.y, Toast.LENGTH_SHORT)
              .show();
        }

    });

}   

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
  getMenuInflater().inflate(R.menu.mapa_lugares, menu);
  return true;
}

}

What's wrong?

Thanks.

Upvotes: 0

Views: 591

Answers (1)

Emil Adz
Emil Adz

Reputation: 41099

You are setting your map in the XML file to be of type: SupportMapFragment:

android:name="com.google.android.gms.maps.SupportMapFragment"

But in your java code you are trying to get another object:

 mMap = ((MapFragment) getFragmentManager().findFragmentById (R.id.mapa)).
 getMap();

2 Problems here:

1. You need to fetch the SupportMapFragment and not MapFragment, like so:

mMap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map)).getMap();

2. You are trying to get the wrong id: in XML you gave the map the: `android:id="@+id/map"

while in code you are trying to get: (R.id.mapa) and this is the wrong id.

Fix those issues and tell us what is the result.

You can also go over this blog post I wrote on Google Map API V2 to get a better idea on how to build an application that uses Google Map API V2:

Google Map API V2 guide

Upvotes: 1

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