Android fragment is not showing up

Question

I have the following codes in my android application:

main.xml :

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

<TextView
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="activity" />

<fragment
    android:id="@+id/list"
    android:name="com.hugo.test.FragmentA"
    android:layout_width="0dp"
    android:layout_height="match_parent"
    android:layout_weight="1" />

</LinearLayout>

fragmenta.xml :

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

<TextView
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="helloA" />

</LinearLayout>

FragmentA.java :

package com.hugo.test;

//some imports here

public class FragmentA extends Fragment {
    /** Called when the activity is first created. */
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) 
    {
        //super.onCreate(savedInstanceState);
        //setContentView(R.layout.main);

        return inflater.inflate(R.layout.fragmenta, container, false);
    }
}

FragmentActivity.java :

    package com.hugo.test;

    //some imports here

public class FragmentActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
    }
}

The layout of the activity should display "activity" and the fragment should display "helloA". When I run my project I only see "activity", so it seems to me that the fragment is ignored at all.

The error I see is :

12-19 09:01:05.370: E/AndroidRuntime(1352): FATAL EXCEPTION: main
12-19 09:01:05.370: E/AndroidRuntime(1352): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.hugo.test/com.hugo.test.FragmentActivity}: android.view.InflateException: Binary XML file line #12: Error inflating class fragment
12-19 09:01:05.370: E/AndroidRuntime(1352):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1751)
12-19 09:01:05.370: E/AndroidRuntime(1352):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1767)
12-19 09:01:05.370: E/AndroidRuntime(1352):     at android.app.ActivityThread.access$1500(ActivityThread.java:122)
12-19 09:01:05.370: E/AndroidRuntime(1352):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1005)
12-19 09:01:05.370: E/AndroidRuntime(1352):     at android.os.Handler.dispatchMessage(Handler.java:99)
12-19 09:01:05.370: E/AndroidRuntime(1352):     at android.os.Looper.loop(Looper.java:132)
12-19 09:01:05.370: E/AndroidRuntime(1352):     at android.app.ActivityThread.main(ActivityThread.java:4028)
12-19 09:01:05.370: E/AndroidRuntime(1352):     at java.lang.reflect.Method.invokeNative(Native Method)
12-19 09:01:05.370: E/AndroidRuntime(1352):     at java.lang.reflect.Method.invoke(Method.java:491)
12-19 09:01:05.370: E/AndroidRuntime(1352):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:844)
12-19 09:01:05.370: E/AndroidRuntime(1352):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:602)
12-19 09:01:05.370: E/AndroidRuntime(1352):     at dalvik.system.NativeStart.main(Native Method)
12-19 09:01:05.370: E/AndroidRuntime(1352): Caused by: android.view.InflateException: Binary XML file line #12: Error inflating class fragment
12-19 09:01:05.370: E/AndroidRuntime(1352):     at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:688)
12-19 09:01:05.370: E/AndroidRuntime(1352):     at android.view.LayoutInflater.rInflate(LayoutInflater.java:724)
12-19 09:01:05.370: E/AndroidRuntime(1352):     at android.view.LayoutInflater.inflate(LayoutInflater.java:479)
12-19 09:01:05.370: E/AndroidRuntime(1352):     at android.view.LayoutInflater.inflate(LayoutInflater.java:391)
12-19 09:01:05.370: E/AndroidRuntime(1352):     at android.view.LayoutInflater.inflate(LayoutInflater.java:347)
12-19 09:01:05.370: E/AndroidRuntime(1352):     at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:245)
12-19 09:01:05.370: E/AndroidRuntime(1352):     at android.app.Activity.setContentView(Activity.java:1780)
12-19 09:01:05.370: E/AndroidRuntime(1352):     at com.hugo.test.FragmentActivity.onCreate(FragmentActivity.java:11)
12-19 09:01:05.370: E/AndroidRuntime(1352):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1048)
12-19 09:01:05.370: E/AndroidRuntime(1352):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1715)
12-19 09:01:05.370: E/AndroidRuntime(1352):     ... 11 more
12-19 09:01:05.370: E/AndroidRuntime(1352): Caused by: android.app.Fragment$InstantiationException: Unable to instantiate fragment com.hugo.test.fragmenta: make sure class name exists, is public, and has an empty constructor that is public
12-19 09:01:05.370: E/AndroidRuntime(1352):     at android.app.Fragment.instantiate(Fragment.java:500)
12-19 09:01:05.370: E/AndroidRuntime(1352):     at android.app.Fragment.instantiate(Fragment.java:468)
12-19 09:01:05.370: E/AndroidRuntime(1352):     at android.app.Activity.onCreateView(Activity.java:4132)
12-19 09:01:05.370: E/AndroidRuntime(1352):     at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:664)
12-19 09:01:05.370: E/AndroidRuntime(1352):     ... 20 more
12-19 09:01:05.370: E/AndroidRuntime(1352): Caused by: java.lang.ClassNotFoundException: com.hugo.test.fragmenta in loader dalvik.system.PathClassLoader[/data/app/com.jochen.test-1.apk]
12-19 09:01:05.370: E/AndroidRuntime(1352):     at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:251)
12-19 09:01:05.370: E/AndroidRuntime(1352):     at java.lang.ClassLoader.loadClass(ClassLoader.java:540)
12-19 09:01:05.370: E/AndroidRuntime(1352):     at java.lang.ClassLoader.loadClass(ClassLoader.java:500)
12-19 09:01:05.370: E/AndroidRuntime(1352):     at android.app.Fragment.instantiate(Fragment.java:490)
12-19 09:01:05.370: E/AndroidRuntime(1352):     ... 23 more

Because of that error I added a constructor to FragmentA.java

public FragmentA()
{

}

This error is not gone, the fragment still doesn't show up, same behavior as before. Anyone an idea?

I just saw that in onCreateView() the ViewGroup container is null, might that be an issue? how to avoid it? — AndyAndroid, Dec 19 '11 at 09:18

score 9 · Accepted Answer · answered Dec 19 '11 at 16:56

9

It was due to the 0dp I haven't seen that when I copied that part from the Android page.

answered Dec 19 '11 at 16:56

AndyAndroid

4,039
14
44
71

score 1 · Answer 2 · answered Mar 15 '21 at 07:58

use this, it works for me

public class FragmentA extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    View returnView = inflater.inflate(R.layout.fragmenta, container, false);
    return returnView;

}

}

score 1 · Answer 3 · edited May 23 '17 at 10:28

1

This

public class FragmentActivity extends Activity {

should be

public class FragmentActivity extends FragmentActivity {

This is also discussed at here

edited May 23 '17 at 10:28

Community

1
1

answered Dec 19 '11 at 12:55

Raymond Lagonda

1,243
14
19

I am not using any compatibility package, pure Honeycomb and above. Hence I am not able to use FragmentActivity, which comes into the system only with that compatibility package to my knowledge. – AndyAndroid Dec 19 '11 at 13:49
Sorry for late reply, I'm not aware of your Honeycomb environment in the first place, but yes, as you said the fragment widget requires width greater than 0dp. – Raymond Lagonda Dec 21 '11 at 09:42

Android fragment is not showing up

3 Answers3