I'm working on an app which contains a total of 5 Fragments, connected with a Bottom Navigation Menu. For the sake of keeping things simple, I'll use 2 of those as an example.
package com.example.ssresilience;
import android.annotation.SuppressLint;
import android.content.Intent;
import android.os.Bundle;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentTransaction;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
/**
* A simple {@link Fragment} subclass.
* Use the {@link GoalsFragment#newInstance} factory method to
* create an instance of this fragment.
*/
public class GoalsFragment extends Fragment {
// TODO: Rename parameter arguments, choose names that match
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
private static final String ARG_PARAM1 = "param1";
private static final String ARG_PARAM2 = "param2";
// TODO: Rename and change types of parameters
private String mParam1;
private String mParam2;
private Button fg_goals_socialize;
private Button fg_goals_study;
private Button fg_goals_exercise;
private Button fg_goals_setgoal;
private TextView fg_goals_placeholder;
private int check = 0;
public GoalsFragment() {
// Required empty public constructor
}
/**
* Use this factory method to create a new instance of
* this fragment using the provided parameters.
*
* @param param1 Parameter 1.
* @param param2 Parameter 2.
* @return A new instance of fragment GoalsFragment.
*/
// TODO: Rename and change types and number of parameters
public static GoalsFragment newInstance(String param1, String param2) {
GoalsFragment fragment = new GoalsFragment();
Bundle args = new Bundle();
args.putString(ARG_PARAM1, param1);
args.putString(ARG_PARAM2, param2);
fragment.setArguments(args);
return fragment;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
mParam2 = getArguments().getString(ARG_PARAM2);
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View rootView = inflater.inflate((R.layout.fragment_goals), container, false);
fg_goals_socialize = (Button)rootView.findViewById(R.id.fg_goals_socialize);
fg_goals_socialize.setOnClickListener(this::onClick);
fg_goals_study = (Button)rootView.findViewById(R.id.fg_goals_study);
fg_goals_study.setOnClickListener(this::onClick);
fg_goals_exercise = (Button)rootView.findViewById(R.id.fg_goals_exercise);
fg_goals_exercise.setOnClickListener(this::onClick);
fg_goals_setgoal = (Button)rootView.findViewById(R.id.fg_goals_setgoal);
fg_goals_setgoal.setOnClickListener(this::onClick);
fg_goals_placeholder = (TextView)rootView.findViewById(R.id.fg_goals_placeholder);
return rootView;
}
@SuppressLint({"UseCompatLoadingForDrawables", "ResourceAsColor", "UseCompatLoadingForColorStateLists", "NonConstantResourceId", "SetTextI18n"})
public void onClick(View v) {
switch (v.getId()) {
case R.id.fg_goals_socialize:
fg_goals_placeholder.setText("• Talk to 3 or more people, other than your family.\n\n" +
"• Engage in phone or video calls from any device.\n\n" +
"• Exit your house for more than 2 hours.\n\n" +
"• Meet new people online or via your phone.");
fg_goals_socialize.setBackgroundDrawable(getResources().getDrawable(R.drawable.buttoncolor_rect));
fg_goals_socialize.setTextColor(getResources().getColorStateList(R.color.buttoncolor_text));
fg_goals_study.setBackgroundDrawable(getResources().getDrawable(R.drawable.buttoncolor_rect_reset));
fg_goals_study.setTextColor(getResources().getColorStateList(R.color.buttoncolor_text_reset));
fg_goals_exercise.setBackgroundDrawable(getResources().getDrawable(R.drawable.buttoncolor_rect_reset));
fg_goals_exercise.setTextColor(getResources().getColorStateList(R.color.buttoncolor_text_reset));
check = 1;
break;
case R.id.fg_goals_study:
fg_goals_placeholder.setText("• Study for 1 or more hours today.\n\n" +
"• Work for at least 1 hour on your projects.\n\n" +
"• Talk to friends or relatives about your projects.\n\n" +
"• Dedicate study time for the course of your liking.");
fg_goals_socialize.setBackgroundDrawable(getResources().getDrawable(R.drawable.buttoncolor_rect_reset));
fg_goals_socialize.setTextColor(getResources().getColorStateList(R.color.buttoncolor_text_reset));
fg_goals_study.setBackgroundDrawable(getResources().getDrawable(R.drawable.buttoncolor_rect));
fg_goals_study.setTextColor(getResources().getColorStateList(R.color.buttoncolor_text));
fg_goals_exercise.setBackgroundDrawable(getResources().getDrawable(R.drawable.buttoncolor_rect_reset));
fg_goals_exercise.setTextColor(getResources().getColorStateList(R.color.buttoncolor_text_reset));
check = 2;
break;
case R.id.fg_goals_exercise:
fg_goals_placeholder.setText("• Dedicate more than 1 hour on physical exercise.\n\n" +
"• Participate in physical exercises with friends or others.\n\n" +
"• Achieve your physical exercise-related goal.\n\n" +
"• Track your fitness-related progress in any way.");
fg_goals_socialize.setBackgroundDrawable(getResources().getDrawable(R.drawable.buttoncolor_rect_reset));
fg_goals_socialize.setTextColor(getResources().getColorStateList(R.color.buttoncolor_text_reset));
fg_goals_study.setBackgroundDrawable(getResources().getDrawable(R.drawable.buttoncolor_rect_reset));
fg_goals_study.setTextColor(getResources().getColorStateList(R.color.buttoncolor_text_reset));
fg_goals_exercise.setBackgroundDrawable(getResources().getDrawable(R.drawable.buttoncolor_rect));
fg_goals_exercise.setTextColor(getResources().getColorStateList(R.color.buttoncolor_text));
check = 3;
break;
default:
break;
}
switch (v.getId()) {
case R.id.fg_goals_setgoal:
if(check == 0) {
Toast.makeText(getActivity(), "Please select one of the 3 Goals!",
Toast.LENGTH_LONG).show();
}
if(check == 1) {
Bundle args = new Bundle();
args.putInt("goal", 1);
ProgressFragment newFragment = new ProgressFragment();
newFragment.setArguments(args);
Toast.makeText(getActivity(), "Current Goal: Socialize More",
Toast.LENGTH_LONG).show();
}
if(check == 2) {
Bundle args = new Bundle();
args.putInt("goal", 2);
ProgressFragment newFragment = new ProgressFragment();
newFragment.setArguments(args);
Toast.makeText(getActivity(), "Current Goal: Enhance Study Motives",
Toast.LENGTH_LONG).show();
}
if(check == 3) {
Bundle args = new Bundle();
args.putInt("goal", 3);
ProgressFragment newFragment = new ProgressFragment();
newFragment.setArguments(args);
Toast.makeText(getActivity(), "Current Goal: Physical Exercise",
Toast.LENGTH_LONG).show();
}
break;
default:
break;
}
}
}
In the GoalsFragment.java above, there are 2 switch methods, one which highlights the buttons and assigns the check variable, while the other one below contains if statements that determine which button is pressed. These 2 are working flawlessly, so the problem is not there. According to the pressed button, in the second switch method, we've got 3 different bundles, which are used to pass data to the Fragment ProgressFragment.java, when the "SET GOAL" button is pressed.
package com.example.ssresilience;
import android.os.Bundle;
import androidx.fragment.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import android.widget.Toast;
/**
* A simple {@link Fragment} subclass.
* Use the {@link ProgressFragment#newInstance} factory method to
* create an instance of this fragment.
*/
public class ProgressFragment extends Fragment {
// TODO: Rename parameter arguments, choose names that match
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
private static final String ARG_PARAM1 = "param1";
private static final String ARG_PARAM2 = "param2";
// TODO: Rename and change types of parameters
private String mParam1;
private String mParam2;
public ProgressFragment() {
// Required empty public constructor
}
/**
* Use this factory method to create a new instance of
* this fragment using the provided parameters.
*
* @param param1 Parameter 1.
* @param param2 Parameter 2.
* @return A new instance of fragment ProgressFragment.
*/
// TODO: Rename and change types and number of parameters
public static ProgressFragment newInstance(String param1, String param2) {
ProgressFragment fragment = new ProgressFragment();
Bundle args = new Bundle();
args.putString(ARG_PARAM1, param1);
args.putString(ARG_PARAM2, param2);
fragment.setArguments(args);
return fragment;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
mParam2 = getArguments().getString(ARG_PARAM2);
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View rootView = inflater.inflate(R.layout.fragment_progress, container, false);
// Get the Selected Goal data from the GoalsFragment
Bundle b = getArguments();
int goal = b.getInt("goal");
System.out.println(goal);
// Set the Progress Fragment Text according to the selected Goal
TextView fg_progress_header2 = (TextView) rootView.findViewById(R.id.fg_progress_header2);
if (goal == 1) {
fg_progress_header2.setText("Socialize More");
} if (goal == 2) {
fg_progress_header2.setText("Enhance Study Motives");
} if (goal == 3) {
fg_progress_header2.setText("Physical Exercise");
}
return rootView;
}
}
In this second Fragment, I am trying to retrieve the goal data from one of the 3 bundles in GoalsFragment.java, and set the text of the TextViews accordingly. For testing purposes, I have included a System.out.println(goal);, which returns 0, indicating that the bundle data is not retrieved properly from the first Fragment.
I have even tried putting the bundle on the onCreateView method of GoalsFragment.java, just in case of faulty code below, but it still didn't work.
Could anyone help me out? Nothing that I do seems to be working...
Thank you in advance!
You need to communicate to multiple fragments via ViewModel or fragment listener
from your GoalFragment
Bundle result = new Bundle();
result.putInt("goal", 1);
getParentFragmentManager().setFragmentResult("progress", result);
In Your ProgressFragment
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getParentFragmentManager().setFragmentResultListener("requestKey", this, new FragmentResultListener() {
@Override
public void onFragmentResult(@NonNull String requestKey, @NonNull Bundle bundle) {
// We use a String here, but any type that can be put in a Bundle is supported
String result = bundle.getInt("goal");
// Do something with the result
}
});
}
You can see the docs for detail implementation https://developer.android.com/guide/fragments/communicate#java