Switch between fragments with MapView

Question

I have a main_activity with a bottom bar. I am using this bottom bar to navigate between fragments. However, there's this one fragment that's not directly navigatable via that bottom bar. It must be accessible from the fragment with MapView and upon onInfoWindowClick. However, the app crashes whenever I consume the infoWindow. Here's my code

public void onMapReady(GoogleMap googleMap) {
        BitmapDescriptor icon = BitmapDescriptorFactory.fromResource(R.drawable.tesla);
        mMap=googleMap;
        for (Location item : array_list) {
            String _title = item.getLocation_name();
            String _snippet = item.getLocation_address();
            LatLng _latLng = new LatLng(item.getLatitude(), item.getLongitude());
            final MarkerOptions mMarkerOptions = new MarkerOptions().icon(icon);
            mMarkerOptions.position(_latLng).title(_title).snippet(_snippet).flat(true);
            Marker marker = mMap.addMarker(mMarkerOptions);
            mMarkerHashMap.put(marker, item);

            CameraPosition cameraPosition = new CameraPosition.Builder()
                    .target(marker.getPosition())
                    .zoom(12.0f)
                    .build();
            mMap.animateCamera(CameraUpdateFactory
                    .newCameraPosition(cameraPosition));

            mMap.setOnInfoWindowClickListener(new GoogleMap.OnInfoWindowClickListener() {
                @Override
                public void onInfoWindowClick(Marker marker) {
                    LocationDetailFragment detailedlocation = new LocationDetailFragment();

                    detailedlocation.LOCATION = mMarkerHashMap.get(marker);
                    FragmentTransaction ft = getFragmentManager().beginTransaction();
                    ft.replace(R.id.content, detailedlocation);
                    ft.addToBackStack(null);
                    ft.commit();
                }
            });
        }

                                                                             --------- beginning of crash 04-23 19:41:11.380 2573-2573/com.teslaqubitsins.fasih.teslahcm E/AndroidRuntime: FATAL
EXCEPTION: main Process: com.teslaqubitsins.fasih.teslahcm, PID: 2573 java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.View android.view.View.findViewById(int)' on a null object reference at com.teslaqubitsins.fasih.teslahcm.LocationDetailFragment.onCreateView(LocationDetailFragment.java:35) at android.support.v4.app.Fragment.performCreateView(Fragment.java:2192) at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1299) at android.support.v4.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManager.java:1528) at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1595) at android.support.v4.app.BackStackRecord.executeOps(BackStackRecord.java:758) at android.support.v4.app.FragmentManagerImpl.executeOps(FragmentManager.java:2363) at android.support.v4.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:2149) at android.support.v4.app.FragmentManagerImpl.optimizeAndExecuteOps(FragmentManager.java:2103) at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:2013) at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:710) at android.os.Handler.handleCallback(Handler.java:751) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:154) at android.app.ActivityThread.main(ActivityThread.java:6119) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776) 04-23 19:41:11.383 1564-1957/system_process W/ActivityManager: Force finishing activity com.teslaqubitsins.fasih.teslahcm/.MainActivity 04-23 19:41:11.414 1296-1653/? E/SurfaceFlinger: ro.sf.lcd_density must be defined as a build property
                                             [ 04-23 19:41:11.456  1564: 3367 D/         ]
                                             HostConnection::get() New Host Connection established 0x87cb5680, tid 3367 04-23
19:41:11.457 1296-1653/? D/gralloc_ranchu: gralloc_alloc: format 1 and usage 0x900 imply creation of host color buffer 04-23 19:41:11.457 1564-3367/system_process I/OpenGLRenderer: Initialized EGL, version 1.4 04-23 19:41:11.458 1564-3367/system_process D/OpenGLRenderer: Swap behavior 1 04-23 19:41:11.458 1564-3367/system_process W/OpenGLRenderer: Failed to choose config with EGL_SWAP_BEHAVIOR_PRESERVED, retrying without... 04-23 19:41:11.458 1564-3367/system_process D/OpenGLRenderer: Swap behavior 0 04-23 19:41:11.462 1296-1653/? D/gralloc_ranchu: gralloc_alloc: format 1 and usage 0x900 imply creation of host color buffer 04-23 19:41:11.476 1296-1653/? D/gralloc_ranchu: gralloc_alloc: format 1 and usage 0x900 imply creation of host color buffer 04-23 19:41:11.892 1564-1591/system_process W/ActivityManager: Activity pause timeout for ActivityRecord{34a233 u0 com.teslaqubitsins.fasih.teslahcm/.MainActivity t141 f} 04-23 19:41:11.921 1296-1962/? D/gralloc_ranchu: gralloc_alloc: format 1 and usage 0x900 imply creation of host color buffer 04-23 19:41:11.940 1296-1962/? D/gralloc_ranchu: gralloc_alloc: format 1 and usage 0x900 imply creation of host color buffer 04-23 19:41:11.951 1296-1962/? D/gralloc_ranchu: gralloc_alloc: format 1 and usage 0x900 imply creation of host color buffer 04-23 19:41:11.968 1296-1426/? D/PermissionCache: checking android.permission.READ_FRAME_BUFFER for uid=1000 => granted (252 us) 04-23 19:41:12.025 1296-1426/? D/gralloc_ranchu: gralloc_alloc: format 1 and usage 0x333 imply creation of host color buffer Blockquote

package com.teslaqubitsins.fasih.teslahcm;


import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.support.v4.app.DialogFragment;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;



public class LocationDetailFragment extends Fragment {
    public static Location LOCATION;
    TextView _campusName;
    TextView _campusAddress;


    public LocationDetailFragment() {
    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {

        View view=inflater.inflate(R.layout.fragment_location_detail, container, false);

        _campusName = (TextView) getView().findViewById(R.id.campus_name);
        _campusAddress = (TextView) getView().findViewById(R.id.campus_address);

        _campusName.setText(LOCATION.getLocation_name());
        _campusAddress.setText(LOCATION.getLocation_address());
        return view;

    }
    public void onClick_call(View view) {
        dialPhoneNumber(LOCATION.getLocation_phone());
    }
    public void dialPhoneNumber(String phoneNumber) {
        Intent intent = new Intent(Intent.ACTION_DIAL);
        intent.setData(Uri.parse("tel:" + phoneNumber));
        if (intent.resolveActivity(getActivity().getPackageManager()) != null) {
            startActivity(intent);
        }
    }
}

04-23 19:58:11.735 6856-6856/com.teslaqubitsins.fasih.teslahcm E/AndroidRuntime: FATAL EXCEPTION: main Process: com.teslaqubitsins.fasih.teslahcm, PID: 6856 java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.View android.view.View.findViewById(int)' on a null object reference at com.teslaqubitsins.fasih.teslahcm.LocationDetailFragment.onCreateView(LocationDetailFragment.java:35) at android.support.v4.app.Fragment.performCreateView(Fragment.java:2192) at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1299) at android.support.v4.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManager.java:1528) at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1595) at android.support.v4.app.BackStackRecord.executeOps(BackStackRecord.java:758) at android.support.v4.app.FragmentManagerImpl.executeOps(FragmentManager.java:2363) at android.support.v4.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:2149) at android.support.v4.app.FragmentManagerImpl.optimizeAndExecuteOps(FragmentManager.java:2103) at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:2013) at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:710) at android.os.Handler.handleCallback(Handler.java:751) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:154) at android.app.ActivityThread.main(ActivityThread.java:6119) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776) 04-23 19:58:12.507 2006-2282/com.google.android.gms.persistent W/GCoreFlp: No location to return for getLastLocation() 04-23 19:58:42.534 2134-2214/com.google.android.googlequicksearchbox:search W/GmsLocationProvider: Error removing location updates: 16

post your `LocationDetailFragment` also ..cause the exception focus on that class — rafsanahmad007, Apr 23 '17 at 14:50
@rafsanahmad007. Also note that I am calling `onInfoWindowClick` from a class `ContactFragment` that's being extended by `Fragment`. I am trying to call `LocationDetailFragment` from `ContactFragment` — theLuckyOne, Apr 23 '17 at 15:06

score 1 · Accepted Answer · answered Apr 23 '17 at 15:07

1

Instead of:

 _campusName = (TextView) getView().findViewById(R.id.campus_name);
 _campusAddress = (TextView) getView().findViewById(R.id.campus_address);

use the fragment's inflated view to get the ID's:

 _campusName = (TextView) view.findViewById(R.id.campus_name);
 _campusAddress = (TextView) view.findViewById(R.id.campus_address);

the exception occurs as your getView() returns null, it is not associated with the fragment's View. In fragment You have to always use the inflated view's reference.

answered Apr 23 '17 at 15:07

rafsanahmad007

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http://stackoverflow.com/questions/43574251/cant-start-a-call-from-within-a-fragment-class – theLuckyOne Apr 23 '17 at 17:22
Please have a look here too. http://stackoverflow.com/questions/43585343/does-scrollview-work-in-fragments – theLuckyOne Apr 24 '17 at 12:04

Switch between fragments with MapView

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