Question

I keep getting that error when starting the activity that has fragment.

This is the overview of my code:

Home activity is started from Splash screen activity

home.xml (Each fragment has 50% layout_weight)

<LinearLayout>
    <fragment android:name="com.example.test.FragmentClass1" ...>
    <fragment android:name="com.example.test.FragmentClass2" ...>
</LinearLayout>

fragment1.xml

<LinearLayout>
    //some EditTexts and Buttons here
<LinearLayout>

fragment2.xml

<LinearLayout>
    <ListView ... />
</LinearLayout>

FragmentClass1.java

public class FragmentClass1 extends Fragment{
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){
        View view = inflater.inflate(R.layout.fragment1, container, false);
        return view;
    }
}

FragmentClass2.java

public class FragmentClass2 extends ListFragment{
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){
        View view = inflater.inflate(R.layout.fragment2, container, false);
        return view;
    }
}

Home.java

public class Home extends Activity{
    public View onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
        setContentView(R.layout.home);
        //still empty
    }
}

The error log is this:

12-09 20:39:00.317: E/AndroidRuntime(18214): FATAL EXCEPTION: main
12-09 20:39:00.317: E/AndroidRuntime(18214): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.test/com.example.test.Home}: android.view.InflateException: Binary XML file line #10: Error inflating class fragment
12-09 20:39:00.317: E/AndroidRuntime(18214):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
12-09 20:39:00.317: E/AndroidRuntime(18214):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
12-09 20:39:00.317: E/AndroidRuntime(18214):    at android.app.ActivityThread.access$600(ActivityThread.java:141)
12-09 20:39:00.317: E/AndroidRuntime(18214):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
12-09 20:39:00.317: E/AndroidRuntime(18214):    at android.os.Handler.dispatchMessage(Handler.java:99)
12-09 20:39:00.317: E/AndroidRuntime(18214):    at android.os.Looper.loop(Looper.java:137)
12-09 20:39:00.317: E/AndroidRuntime(18214):    at android.app.ActivityThread.main(ActivityThread.java:5039)
12-09 20:39:00.317: E/AndroidRuntime(18214):    at java.lang.reflect.Method.invokeNative(Native Method)
12-09 20:39:00.317: E/AndroidRuntime(18214):    at java.lang.reflect.Method.invoke(Method.java:511)
12-09 20:39:00.317: E/AndroidRuntime(18214):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
12-09 20:39:00.317: E/AndroidRuntime(18214):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
12-09 20:39:00.317: E/AndroidRuntime(18214):    at dalvik.system.NativeStart.main(Native Method)
12-09 20:39:00.317: E/AndroidRuntime(18214): Caused by: android.view.InflateException: Binary XML file line #10: Error inflating class fragment
12-09 20:39:00.317: E/AndroidRuntime(18214):    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:704)
12-09 20:39:00.317: E/AndroidRuntime(18214):    at android.view.LayoutInflater.rInflate(LayoutInflater.java:746)
12-09 20:39:00.317: E/AndroidRuntime(18214):    at android.view.LayoutInflater.inflate(LayoutInflater.java:489)
12-09 20:39:00.317: E/AndroidRuntime(18214):    at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
12-09 20:39:00.317: E/AndroidRuntime(18214):    at android.view.LayoutInflater.inflate(LayoutInflater.java:352)
12-09 20:39:00.317: E/AndroidRuntime(18214):    at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:270)
12-09 20:39:00.317: E/AndroidRuntime(18214):    at android.app.Activity.setContentView(Activity.java:1881)
12-09 20:39:00.317: E/AndroidRuntime(18214):    at com.example.test.Home.onCreate(Home.java:16)
12-09 20:39:00.317: E/AndroidRuntime(18214):    at android.app.Activity.performCreate(Activity.java:5104)
12-09 20:39:00.317: E/AndroidRuntime(18214):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
12-09 20:39:00.317: E/AndroidRuntime(18214):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
12-09 20:39:00.317: E/AndroidRuntime(18214):    ... 11 more
12-09 20:39:00.317: E/AndroidRuntime(18214): Caused by: java.lang.ClassCastException: com.example.test.Fragment1 cannot be cast to android.app.Fragment
12-09 20:39:00.317: E/AndroidRuntime(18214):    at android.app.Fragment.instantiate(Fragment.java:585)
12-09 20:39:00.317: E/AndroidRuntime(18214):    at android.app.Fragment.instantiate(Fragment.java:560)
12-09 20:39:00.317: E/AndroidRuntime(18214):    at android.app.Activity.onCreateView(Activity.java:4709)
12-09 20:39:00.317: E/AndroidRuntime(18214):    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:680)
12-09 20:39:00.317: E/AndroidRuntime(18214):    ... 21 more

Any solution? Thanks

Answer 1

If you are trying to use the Android Support package’s backport of fragments, you need to have your activity inherit from FragmentActivity (or from something else that inherits from FragmentActivity, like SherlockFragmentActivity).

---

UPDATE

The key line from your stack trace is:

12-09 20:39:00.317: E/AndroidRuntime(18214): Caused by: java.lang.ClassCastException: com.example.test.Fragment1 cannot be cast to android.app.Fragment

Now, there is nothing in your supplied source code that is named com.example.test.Fragment1. If this is really what you have in your listings as com.example.test.FragmentClass1, then presumably the Fragment you are inheriting from is not android.app.Fragment. Most likely, in that case, it is android.support.v4.app.Fragment — the Fragment class from the backport. If this is the case, change the import statement (and any other flawed ones in the rest of your code base).