Use of Actionbar Up Navigation Android - API23

Question

I’m implementing an app that has a activity to load a map and another activity to list the places the user has selected on the map.

How I’m working with API23, Toolbar was successfully aired on activity leading.

I need to implement the up navigation in activity of maps, so that the user can go back to main if they wish. The problem is that I cannot use toolbar in that activity Because she’s inheriting a FragmentActivity, who can’t stand the setSupportActionBar.

So I tried to solve by manually creating a ActionBar and finally, updating the Manifest. As shown below, nothing is displayed in Actionbar.

Main activity with Actionbar OK

Mapsactivity with Actionbar with nothing

Mapsactivity class

import android.app.ActionBar;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.util.Log;
import android.view.MenuItem;

import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;

public class MapsActivity extends AppCompatActivity implements OnMapReadyCallback {

private GoogleMap mMap;

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

    // Obtain the SupportMapFragment and get notified when the map is ready to be used.
    SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
            .findFragmentById(R.id.map);
    mapFragment.getMapAsync(this);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    android.support.v7.app.ActionBar actionBar = getSupportActionBar();
    if (actionBar != null) {
        actionBar.setDisplayHomeAsUpEnabled(true);
    }

    Intent intent = getIntent();
    Log.i("InfoLocalizacao", Integer.toString(intent.getIntExtra("InfoLocalizacao", -1)));

}

@Override
public void onMapReady(GoogleMap googleMap) {
    mMap = googleMap;

    // Add a marker in Sydney and move the camera
    LatLng sydney = new LatLng(-34, 151);
    mMap.addMarker(new MarkerOptions().position(sydney).title("Marker in Sydney"));
    mMap.moveCamera(CameraUpdateFactory.newLatLng(sydney));
}

@Override
public boolean onOptionsItemSelected(MenuItem item){

    switch (item.getItemId()){
        case android.R.id.home:
            this.finish();
            return true;
        default:
            return super.onOptionsItemSelected(item);
    }

}

}

Manifest

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="luizugliano.com.br.lugaresfavoritos">

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />

<uses-feature
    android:glEsVersion="0x00020000"
    android:required="true" />

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">
    <activity
        android:name=".MainActivity"
        android:label="@string/app_name"
        android:theme="@style/AppTheme.NoActionBar">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>

    <meta-data
        android:name="com.google.android.gms.version"
        android:value="@integer/google_play_services_version" />
    <meta-data
        android:name="com.google.android.geo.API_KEY"
        android:value="@string/google_maps_key" />

    <activity
        android:name=".MapsActivity"
        android:label="@string/title_activity_maps"
        android:parentActivityName=".MainActivity" />

    <meta-data
        android:name="android.support.PARENT_ACTIVITY"
        android:value=".MainActivity" />

</application>

</manifest>

Answer 1

Change FragmentActivity for AppCompatActivity (which is a subclass of FragmentActivity with support to action bar).

So, in addition to being able to work with maps in your MapsActivity, will have access to action bar through the method getSupportActionBar() (which should be used instead of getActionBar()).

For this you will need to use the library appcompat support version 7 (see here how to install).

---

(EDITED) See if your Styles.xml looks like this one:

<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
    <item name="windowNoTitle">true</item>
    <item name="windowActionBar">false</item>
    ...
</style>

See also if it works without the <item>. Maybe it works without.