android.support.v4.app.FragmentActivity缺少操作栏

Question

I am using the support library android.support.v4.app.FragmentActivity to create Fragment based activities.

Since Lollipop I am now missing my action bar in all fragment based activities. I am wondering is this something to do with activities now inheriting from actionbaractivity?

I list below my manifest, activity and fragment xml and hope someone can tell me why this is happening. The design screens all show the title bar but it is missing on emulator and actual device runs.

First of all here is my fragment activity class that I extend for each activity, followed by my xml files:

SingleFragmentActivity.java:

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;

public abstract class SingleFragmentActivity extends FragmentActivity {

    protected abstract Fragment createFragment();

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

        FragmentManager fm = getSupportFragmentManager();
        Fragment fragment = fm.findFragmentById(R.id.fragmentContainer);

        if (fragment == null) {
            fragment = createFragment();
            fm.beginTransaction().add(R.id.fragmentContainer, fragment).commit();
        }
    }

}

AndroidManifest.xml:

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

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

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

</manifest>

activity_fragment.xml:

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
                xmlns:tools="http://schemas.android.com/tools"
                android:id="@+id/fragmentContainer"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:paddingLeft="@dimen/activity_horizontal_margin"
                android:paddingRight="@dimen/activity_horizontal_margin"
                android:paddingTop="@dimen/activity_vertical_margin"
                android:paddingBottom="@dimen/activity_vertical_margin"
                tools:context=".MainActivity">

    <TextView
        android:text="@string/hello_world"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>

</FrameLayout>

fragment_appt.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:orientation="vertical"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              android:weightSum="1">
... REST OF FRAGMENT LAYOUT CUT FOR BREVITY

In design view the action bar and title etc are clearly visible, but when I run on the emulator the action bar is totally missing and only the activity view (with fragment) is rendered.

I hope someone can help with this as it is driving me mad. I am convinced it is something to do with the fact that I am using the support library for my fragments. Or maybe it is a theme issue?

Thanks.

EDIT: styles.xml listed as requested:

<resources>

    <!-- Base application theme. -->
    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
        <!-- Customize your theme here. -->
    </style>

</resources>

.

Answer 1

Your AppTheme is inheriting from Theme.AppCompat . For that to work, you must inherit from AppCompatActivity . Since AppCompatActivity itself inherits from FragmentActivity , most of your existing code should be fine. The only stuff that would need to change is anything related to the action bar, such as:

• Use getSupportActionBar() , rather than getActionBar() , to get the ActionBar object

• Use attributes in a custom namespace (eg, app ) where needed (eg, app:showAsAction ) instead of the android namespace (eg, android:showAsAction ) in menu resources

Note that in older versions ActionBarActivity had been used, which has been declared deprecated.

Answer 2

将支持工具栏用于Lollipop而不是ActionBar