NullPointerException in Fragment Manager

Question

Can anyone please help me solve this exception? This is the code of fragment manager and how to show my fragment in activity

private void selectItem(int position) {
    Fragment fragment = null;
    // minus 1 because we have header that has 0 position
    if (position < 1) { // because we have header, we skip clicking on it
        return;
    }
    switch (position) {
        case 2:
            fragment = new TextViewsFragment();
            break;
        case 3:
            //fragment = new ProfilFragment();
            break;
        case 4:
            //fragment = new AttendanceFragment();
            break;
        case 5:
            //fragment = new PermitFragment();
            break;
        case 6:
            //Logout();
            break;
        default:
            break;
    }
    commitFragment(fragment);

    mDrawerList.setItemChecked(position, true);
    setTitle(mDrawerItems.get(position - 1).getTitle());
    mDrawerLayout.closeDrawer(mDrawerList);
}
private class CommitFragmentRunnable implements Runnable {

    private Fragment fragment;

    public CommitFragmentRunnable(Fragment fragment) {
        this.fragment = fragment;
    }

    @Override
    public void run() {
        FragmentManager fragmentManager = getSupportFragmentManager();
        fragmentManager.beginTransaction()
                .replace(R.id.content_frame, fragment).commit();
    }
}

public void commitFragment(Fragment fragment) {
    // Using Handler class to avoid lagging while
    // committing fragment in same time as closing
    // navigation drawer
    mHandler.post(new CommitFragmentRunnable(fragment));
}

the exception point to .replace(R.id.content_frame, fragment).commit();

Exception getting :

java.lang.NullPointerException
            at android.support.v4.app.BackStackRecord.doAddOp(BackStackRecord.java:416)
            at android.support.v4.app.BackStackRecord.replace(BackStackRecord.java:451)
            at android.support.v4.app.BackStackRecord.replace(BackStackRecord.java:443)
            at com.csform.android.uiapptemplate.LeftMenusActivity$CommitFragmentRunnable.run(LeftMenusActivity.java:221)
            at android.os.Handler.handleCallback(Handler.java:733)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:149)
            at android.app.ActivityThread.main(ActivityThread.java:5268)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:609)
            at dalvik.system.NativeStart.main(Native Method)

i tried to call one fragment into my activity by choose the left menu, but it get exception null pointer.

Because you are getting getSupportFragmentManager(); in different thread not ui thread.!! — AndiGeeky
– AndiGeeky, Commented Sep 15, 2015 at 9:56
then how to solve this? i want to show my fragment at this activity — lindha dwi ambarwati
– lindha dwi ambarwati, Commented Sep 15, 2015 at 9:57
then how to get the fragment then? i use this code in my another app, but it works normally... — lindha dwi ambarwati
– lindha dwi ambarwati, Commented Sep 15, 2015 at 10:00
You have to call this method in activity not in fragment..!! — AndiGeeky
– AndiGeeky, Commented Sep 15, 2015 at 10:00

Randyka Yudhistira · Accepted Answer · 2015-09-15 10:18:39Z

1

refer to Mamata Gelanee's comment :

private FragmentManager fragmentManager;
    @Override
    public void onCreate(Bundle savedInstanceState) {
      ......
      fragmentManager = getSupportFragmentManager();
    }

Then in your runnable :

    @Override
    public void run() {
        fragmentManager.beginTransaction()
                .replace(R.id.content_frame, fragment).commit();
    }

answered Sep 15, 2015 at 10:18

Randyka Yudhistira

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8 Comments

lindha dwi ambarwati Over a year ago

then it's get exception again

lindha dwi ambarwati Over a year ago

android.app.ServiceConnectionLeaked: Service com.android.exchange.ExchangeService has leaked ServiceConnection com.android.emailcommon.service.ServiceProxy$ProxyConnection@21c4a268 that was originally bound here at android.app.LoadedApk$ServiceDispatcher.<init>(LoadedApk.java:979) at

Randyka Yudhistira Over a year ago

@lindhadwiambarwati thats different app. its not about your app -.-

lindha dwi ambarwati Over a year ago

i got this exception in my app, when i trying to show my fragment, it not responding and get this exception -_-

lindha dwi ambarwati Over a year ago

still get null exception

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