SharedPreferences in fragment with button-CodePudding

I have a TextView that stores a specific number of age and there are two buttons increasing that number and decreasing, after I set a specific number in the textview, I want to save it using SharedPreferences. What am I doing wrong? Just learning to program.



    public SharedPreferences pref;
    public final String save_key = "save_key";

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View v =  inflater.inflate(R.layout.fragment_third, container, false);

TextView age = (TextView) v.findViewById(R.id.age);
        Button button_add_age = (Button) v.findViewById(R.id.button_add_age);
        button_add_age.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (Integer.parseInt(age.getText().toString()) > 0) {
                    int age_value = Integer.parseInt(age.getText().toString())   1;
                    age.setText(String.valueOf(age_value));
                }
            }
        });

        Button button_remove_age = (Button) v.findViewById(R.id.button_remove_age);
        button_remove_age.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (Integer.parseInt(age.getText().toString()) > 1) {
                    int age_value = Integer.parseInt(age.getText().toString()) - 1;
                    age.setText(String.valueOf(age_value));
                }
            }
        });

 Button saveButton = (Button) v.findViewById(R.id.save_button);
         saveButton.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
                 SharedPreferences.Editor edit = pref.edit();
                 edit.putString(save_key,age.getText().toString());
                 edit.apply();

             }
         });

return v;

CodePudding user response：

You can write to SharedPreference like the code below. Please read Save key-value data for more information.

SharedPreferences sharedPref = getActivity().getPreferences(Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPref.edit();
editor.putString(save_key, age.getText().toString());
editor.apply();

CodePudding user response：

Not really sure what's your issue, since you haven't mentioned what's not working. But from the snippet, the SharedPreferences pref is not initialized.

It should be something like context.getSharedPreferences("my-shared-perferences", MODE_PRIVATE)