Getting back from Activity to fragment

Question

I have a TabLayout and ViewPager in an Activity. I'm using single fragment to create the pages of tabs. I'm opening an Activity from that fragment. When I click the phone's back button to go back to the TabLayout Activity (with fragment) its working fine. But when I use Toolbar's back button, the TabLayout Activity is not opening, instead a blank page is showing. When I press phone's back button now, then only the TabLayout Activity is showing. Is there something I can do to resolve this?

 public class ProdDetailsActivity extends AppCompatActivity{ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_proddetails); Toolbar toolbar = (Toolbar)findViewById(R.id.toolbar); setSupportActionBar(toolbar); getSupportActionBar().setDisplayHomeAsUpEnabled(true); } @Override public boolean onOptionsItemSelected(MenuItem menuItem) { switch (menuItem.getItemId()){ case android.R.id.home: // This is not working onBackPressed(); finish(); } return super.onOptionsItemSelected(menuItem); } } 

 // Fragment inside TabLayout Activity public class SubCatFrag extends Fragment{ private TextView emptytxt; private ListView listView; private ArrayList<Model> mListData=new ArrayList<>(); private CustomListAdapter adapter; private ConnectionDetector cd; public String userid; SharedPreferences sharedpreferences; private ProgressDialog pd; private static final int RQST_ONE = 1; private static final int RQST_TWO = 2; public static SubCatFrag newInstance(int index) { SubCatFrag myFragment = new SubCatFrag(); Bundle args = new Bundle(); args.putInt("index", index); myFragment.setArguments(args); return(myFragment); } @Override public void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); setHasOptionsMenu(true); } @Nullable @Override public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { return inflater.inflate(R.layout.subcatfrag, container, false); } @Override public void onViewCreated(View view, @Nullable Bundle savedInstanceState) { super.onViewCreated(view, savedInstanceState); ((AppCompatActivity) getActivity()).getSupportActionBar().setTitle("LIST PRODUCT"); emptytxt = (TextView)view.findViewById(R.id.emptytxt); listView = (ListView)view.findViewById(R.id.list); pd = new ProgressDialog(getActivity()); cd = new ConnectionDetector(getActivity()); if(cd.isConnectingToInternet()){ fetchDetails(); }else{ Toast.makeText(getActivity(), "No Internet Available", Toast.LENGTH_SHORT).show(); } adapter = new CustomListAdapter(getActivity(), R.layout.productlistrowlayout, mListData); listView.setAdapter(adapter); listView.setEmptyView(emptytxt); listView.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { String prod=mListData.get(position).getProd_id(); String title=mListData.get(position).getTitle(); Intent intent = new Intent(getActivity(), ProdDetailsActivity.class); intent.putExtra("prd_id",prod); intent.putExtra("title",title); startActivityForResult(intent,RQST_TWO); } }); } private void fetchDetails() { pd.setMessage("Please wait.."); pd.show(); sharedpreferences = getActivity().getSharedPreferences("MyPREFERENCES", Context.MODE_PRIVATE); userid=sharedpreferences.getString("userid",""); System.out.println("usersam_"+" "+userid); if(mListData!=null )mListData.clear(); StringRequest stringRequest = new StringRequest(Request.Method.POST, URLUtil.FETCHLIST, new Response.Listener<String>() { @Override public void onResponse(String response) { pd.dismiss(); try { JSONObject obj1 = new JSONObject(response); JSONArray jsonArray = obj1.getJSONArray("allProducts"); for(int i=0; i<jsonArray.length(); i++){ JSONObject obj = jsonArray.getJSONObject(i); if(obj.length() != 0 ){ Model model = new Model(); model.setImage(obj.getString("prd_img")); model.setTitle(obj.getString("title")); model.setDate(obj.getString("date")); model.setPrice(obj.getString("price")); model.setProd_id(obj.getString("id")); double rate = i + (i*0.1); model.setRate(String.valueOf(rate)); mListData.add(model); } } adapter.notifyDataSetChanged(); } catch (JSONException e) { e.printStackTrace(); //Toast.makeText(HomeActivity.this, "Json error: " + e.getMessage(), Toast.LENGTH_LONG).show(); } } }, new Response.ErrorListener() { @Override public void onErrorResponse(VolleyError error) { //Toast.makeText(getActivity(), "VolleyError" + error.toString(), Toast.LENGTH_LONG).show(); pd.dismiss(); if (error instanceof TimeoutError || error instanceof NoConnectionError) { Toast.makeText(getActivity(),getActivity().getString(R.string.error_network_timeout),Toast.LENGTH_LONG).show(); } else if (error instanceof AuthFailureError) { //TODO } else if (error instanceof ServerError) { //TODO } else if (error instanceof NetworkError) { //TODO } else if (error instanceof ParseError) { //TODO } } }) { @Override protected Map<String, String> getParams() { Map<String, String> params = new HashMap<String, String>(); params.put("user_id", userid); return params; } }; RequestQueue requestQueue = Volley.newRequestQueue(getActivity()); requestQueue.add(stringRequest); stringRequest.setRetryPolicy(new DefaultRetryPolicy( 10000, DefaultRetryPolicy.DEFAULT_MAX_RETRIES, DefaultRetryPolicy.DEFAULT_BACKOFF_MULT)); } @Override public void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); if(resultCode==RESULT_OK && requestCode==RQST_ONE){ fetchDetails(); }else if(resultCode==RESULT_OK && requestCode==RQST_TWO){ fetchDetails(); } } } 

Answer 1

Try this code instead of onOptionsItemSelected..... Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); setSupportActionBar(toolbar);

    getSupportActionBar().setDisplayHomeAsUpEnabled(true);
    getSupportActionBar().setDisplayShowHomeEnabled(true);

    toolbar.setNavigationOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent goBack = new Intent(getApplicationContext(),YourActivity.class);
            startActivity(goBack);
            finish();
        }
    });

Answer 2

Write the below code in onCreate():

 Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        getSupportActionBar().setHomeButtonEnabled(true);
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        toolbar.setNavigationOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                onBackPressed();
            }
        });

and in your class add the following code :

  @Override
public void onBackPressed() {
        Intent prev = new Intent(getApplicationContext(),PreviousActivity.class);
        startActivity(prev);
    finish();
}