CODEWITHSUNDEEP
android
Imran Aslam
Imran Aslam

Reputation: 208

Snackbar not working in fragment , tried solutions from other questions

I am trying to create a snackbar in a fragment. I tried many other similar questions but couldn't find a solution. When the fragment is opened, app crashes. I don't know what the problem is. Can someone help me. Thanks in advance. This is my fragment:

public class MainFragment extends Fragment {


    public MainFragment() {
        // Required empty public constructor
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_main, null);
        ImageView test = new ImageView(getContext());
        ImageView nyimg = (ImageView)view.findViewById(R.id.glidimg);

        Glide.with(getContext()).load("http://inthecheesefactory.com/uploads/source/glidepicasso/cover.jpg").into(nyimg);

        Snackbar.make(view, "Some Message", Snackbar.LENGTH_INDEFINITE).show();

       // Picasso.with(getContext()).load("http://inthecheesefactory.com/uploads/source/glidepicasso/cover.jpg").into(test);
        return view;
        //return inflater.inflate(R.layout.fragment_main, container, false);
    }
}

This is my xml file:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    tools:context="com.example.imran.myapp.MainFragment"
   >

    <TextView
        android:id="@+id/main_title"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:textSize="35sp"
        android:textColor="@color/white"
        android:textAlignment="center"
        android:background="@drawable/title_background"
        android:layout_gravity="center"
        android:text="Welcome" />
    <LinearLayout android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <TextView
            android:layout_marginTop="40dp"
            android:textSize="25sp"
            android:textStyle="bold"
            android:textAlignment="center"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:text="You are logged in."
            />

        <ImageView
            android:id="@+id/glidimg"
            android:layout_width="fill_parent"
            android:layout_height="match_parent"
            android:contentDescription="my image"
            android:src="@drawable/ic_menu_gallery"
            />

    </LinearLayout>

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="www.mirzaphotos.com"
        android:layout_gravity="bottom"
        android:textAlignment="center"
        android:textSize="15sp"
        android:textStyle="bold"
        android:textColor="@color/darkorange"

        android:layout_alignParentBottom="true"
        />

</RelativeLayout>

I get this error:

04-08 17:57:18.559 4049-4049/? E/AndroidRuntime: FATAL EXCEPTION: main
                                                 Process: com.example.imran.myapp, PID: 4049
                                                 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.imran.myapp/com.example.imran.myapp.Home}: java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.Context android.view.ViewGroup.getContext()' on a null object reference
                                                     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2808)
                                                     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2873)
                                                     at android.app.ActivityThread.access$900(ActivityThread.java:181)
                                                     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1482)
                                                     at android.os.Handler.dispatchMessage(Handler.java:102)
                                                     at android.os.Looper.loop(Looper.java:145)
                                                     at android.app.ActivityThread.main(ActivityThread.java:6145)
                                                     at java.lang.reflect.Method.invoke(Native Method)
                                                     at java.lang.reflect.Method.invoke(Method.java:372)
                                                     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1399)
                                                     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1194)
                                                  Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.Context android.view.ViewGroup.getContext()' on a null object reference
                                                     at android.support.design.widget.Snackbar.<init>(Snackbar.java:180)
                                                     at android.support.design.widget.Snackbar.make(Snackbar.java:206)
                                                     at com.example.imran.myapp.MainFragment.onCreateView(MainFragment.java:42)
                                                     at android.support.v4.app.Fragment.performCreateView(Fragment.java:1962)
                                                     at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1026)
                                                     at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1207)
                                                     at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:738)
                                                     at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1572)
                                                     at android.support.v4.app.FragmentController.execPendingActions(FragmentController.java:330)
                                                     at android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:511)
                                                     at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1234)
                                                     at android.app.Activity.performStart(Activity.java:6412)
                                                     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2771)
                                                     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2873) 
                                                     at android.app.ActivityThread.access$900(ActivityThread.java:181) 
                                                     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1482) 
                                                     at android.os.Handler.dispatchMessage(Handler.java:102) 
                                                     at android.os.Looper.loop(Looper.java:145) 
                                                     at android.app.ActivityThread.main(ActivityThread.java:6145) 
                                                     at java.lang.reflect.Method.invoke(Native Method) 
                                                     at java.lang.reflect.Method.invoke(Method.java:372) 
                                                     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1399) 
                                                     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1194) 
04-08 17:57:18.559 4068-4097/? D/AcmsCertificateMngr: handleAppRemoved() Enter com.example.imran.myapp
04-08 17:57:18.569 1036-1514/? V/ApplicationPolicy: isApplicationStateBlocked userId 0 pkgname com.example.imran.myapp
04-08 17:57:18.579 1036-1514/? W/ActivityManager:   Force finishing activity com.example.imran.myapp/.Home

Upvotes: 0

Views: 2553

Answers (2)

Sathish Kumar
Sathish Kumar

Reputation: 71

Please try using CoordinatorLayout.

Snackbar will walk up the view tree trying to find a suitable parent, which is defined as a CoordinatorLayout or the window decor's content view, whichever comes first.

http://www.androidhive.info/2015/09/android-material-design-snackbar-example/

Upvotes: 1

M G
M G

Reputation: 1250

It cannot create Snackbar when View is not attached to parent(it returns null from getContext). Move your Snackbar.create() to onActivityCreated or some other method from lifecycle like onResume() etc. 

public class MainFragment extends Fragment {

    View view;
    public MainFragment() {
        // Required empty public constructor
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        view = inflater.inflate(R.layout.fragment_main, null);
        ImageView test = new ImageView(getContext());
        ImageView nyimg = (ImageView)view.findViewById(R.id.glidimg);

        Glide.with(getContext()).load("http://inthecheesefactory.com/uploads/source/glidepicasso/cover.jpg").into(nyimg);



       // Picasso.with(getContext()).load("http://inthecheesefactory.com/uploads/source/glidepicasso/cover.jpg").into(test);
        return view;
        //return inflater.inflate(R.layout.fragment_main, container, false);
    }
    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        Snackbar.make(view, "Some Message", Snackbar.LENGTH_INDEFINITE).show();
    }
}

Upvotes: 3

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