Question

short info about project:

• minSDK = 8
• import android.support.v4

Part of class code:

public class DetailsActivity extends FragmentActivity implements ToplineTrigger {

static Context mContext;

private static FragmentManager fm;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.details);
    if (mContext == null)
        mContext = Pleazzme.getAppContext();

    DetailsTitleFragment title = new DetailsTitleFragment();
    DocumentDescriptionWeb description = new DocumentDescriptionWeb();
    getSupportFragmentManager()
            .beginTransaction()
            .add(R.id.detailstitlefragment_wrap, title, "DetailsTitle")
            .add(R.id.documentdescriptionweb_wrap, description, "WebDescription")
            .commit();

    ((Topline) fm.findFragmentByTag("Topline")).setDetailsMode();
};

Xml view:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/details_contentwrapper"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:orientation="vertical" >

<fragment
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    class="com.mtechnologia.pleazzme.Topline"
    android:tag="Topline" />

<FrameLayout
    android:id="@+id/detailstitlefragment_wrap"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" >
</FrameLayout>

<FrameLayout
    android:id="@+id/documentdescriptionweb_wrap"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" >
</FrameLayout>
</LinearLayout>

classes declaration:

public class DetailsTitleFragment extends ListFragment{...}

public class DocumentDescriptionWeb extends Fragment {

WebView mWebView = null;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    return inflater.inflate(R.layout.simplewebview, container);
}

@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);
    mWebView = (WebView) view.findViewById(R.id.simplewebview);
    mWebView.getSettings().setJavaScriptEnabled(false);
    mWebView.getSettings().setSupportZoom(false);

    String data = "asdasdasd";
    mWebView.loadData(data, "text/html", "utf-8");
}

}  

after code runs i get error:

08-15 19:11:08.003: E/AndroidRuntime(24708): FATAL EXCEPTION: main
08-15 19:11:08.003: E/AndroidRuntime(24708): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.mtechnologia.pleazzme/com.mtechnologia.pleazzme.DetailsActivity}: java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.
08-15 19:11:08.003: E/AndroidRuntime(24708):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1967)
08-15 19:11:08.003: E/AndroidRuntime(24708):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1992)
08-15 19:11:08.003: E/AndroidRuntime(24708):    at android.app.ActivityThread.access$600(ActivityThread.java:127)
08-15 19:11:08.003: E/AndroidRuntime(24708):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1158)
08-15 19:11:08.003: E/AndroidRuntime(24708):    at android.os.Handler.dispatchMessage(Handler.java:99)
08-15 19:11:08.003: E/AndroidRuntime(24708):    at android.os.Looper.loop(Looper.java:137)
08-15 19:11:08.003: E/AndroidRuntime(24708):    at android.app.ActivityThread.main(ActivityThread.java:4511)
08-15 19:11:08.003: E/AndroidRuntime(24708):    at java.lang.reflect.Method.invokeNative(Native Method)
08-15 19:11:08.003: E/AndroidRuntime(24708):    at java.lang.reflect.Method.invoke(Method.java:511)
08-15 19:11:08.003: E/AndroidRuntime(24708):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:980)
08-15 19:11:08.003: E/AndroidRuntime(24708):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:747)
08-15 19:11:08.003: E/AndroidRuntime(24708):    at dalvik.system.NativeStart.main(Native Method)
08-15 19:11:08.003: E/AndroidRuntime(24708): Caused by: java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.
08-15 19:11:08.003: E/AndroidRuntime(24708):    at android.view.ViewGroup.addViewInner(ViewGroup.java:3342)
08-15 19:11:08.003: E/AndroidRuntime(24708):    at android.view.ViewGroup.addView(ViewGroup.java:3213)
08-15 19:11:08.003: E/AndroidRuntime(24708):    at android.view.ViewGroup.addView(ViewGroup.java:3170)
08-15 19:11:08.003: E/AndroidRuntime(24708):    at android.view.ViewGroup.addView(ViewGroup.java:3150)
08-15 19:11:08.003: E/AndroidRuntime(24708):    at android.support.v4.app.NoSaveStateFrameLayout.wrap(NoSaveStateFrameLayout.java:40)
08-15 19:11:08.003: E/AndroidRuntime(24708):    at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:875)
08-15 19:11:08.003: E/AndroidRuntime(24708):    at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1083)
08-15 19:11:08.003: E/AndroidRuntime(24708):    at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:635)
08-15 19:11:08.003: E/AndroidRuntime(24708):    at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1431)
08-15 19:11:08.003: E/AndroidRuntime(24708):    at android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:523)
08-15 19:11:08.003: E/AndroidRuntime(24708):    at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1136)
08-15 19:11:08.003: E/AndroidRuntime(24708):    at android.app.Activity.performStart(Activity.java:4480)
08-15 19:11:08.003: E/AndroidRuntime(24708):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1940)
08-15 19:11:08.003: E/AndroidRuntime(24708):    ... 11 more  

can someone tell me, what i doing wrong?
i know, that i can declare both fragments in XML, but i need add this fragments programmatically, to replace them when i need this.
Thanks in advance for your help

Answer 1

You need to change

inflater.inflate(R.layout.simplewebview, container);

to

inflater.inflate(R.layout.simplewebview, container, false);

Setting that attribute to false will ensure that the view is detatched from the parent container that’s passed in from the view. The View that’s returned from onCreateView() can’t be attached to a parent since it will be added to the container shortly after by the system itself.