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W1ll
Asked: 2020-06-05 15:56:04 +0800 CST 2020-06-05 15:56:04 +0800 CST

How to change the text of a Button in a fragment in Android

  • 772

I need to change the texto de un botonaccording to certain conditions, but this inside a Fragment, but when I try to do it I have an error here:

mHexBtn.setText(modoConsola);

Could someone tell me how to correct this.

Here is my code:

private boolean mConfigModeConsola;
private String modoConsola = "";

public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.content_main, container, false);

    mSendText = view.findViewById(R.id.send_text);
    mHexBtn = (Button) view.findViewById(R.id.hex_btn);

    mHexBtn.setOnClickListener(new View.OnClickListener(){
        public void onClick(View v) {
            if(mConfigModeConsola == false) {
                mConfigModeConsola = true;
                modoConsola = "HEX";
                mHexBtn.setText(modoConsola);
                mSendText.setText( "" );
             }
            else {
                mConfigModeConsola = false;
                modoConsola = "ASCII";
                mHexBtn.setText(modoConsola);
                mSendText.setText( "" );
            }
        }
    });

    return view;
}

Here the error:

enter image description here

android

2 Answers

  1. Best Answer

    I've been going through that code, the only things I don't see that are in your question is the button declaration, and I'm assuming the other id you get back is a TextView, because you didn't cast with (TextView)I don't know if it is or not. I also do not see the blank constructor that requires the Fragment, maybe it is not very relevant for this case but it is important that you put most of the code to receive better answers. Here is the way I did the example, it works normally, it changes the text of the button every time I press it without problems.

    public class BlankFragment extends Fragment {

    private Button g;
    private TextView ls;
    private boolean mConfigModeConsola;
    private String modoConsola = "";

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


    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment

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

        g = (Button) view.findViewById(R.id.boton);
        ls = (TextView) view.findViewById(R.id.text);

        g.setOnClickListener(new View.OnClickListener(){
            public void onClick(View v) {
                if(!mConfigModeConsola) {
                    mConfigModeConsola = true;
                    modoConsola = "HEX";
                    g.setText(modoConsola);
                    ls.setText( "" );
                }
                else {
                    mConfigModeConsola = false;
                    modoConsola = "ASCII";
                    g.setText(modoConsola);
                    ls.setText( "" );
                }
            }
        });



        return view;
    }

}

    If it is the same as this and it still gives you the same error, I could recommend you to do is:

    File > Invalidate Caches / Restart

    You may have the error because of that, also clean the project (Build > Clean Project)and rebuild (Build > Rebuild Project), also sync with Gradle.

    • 1

  2. mHexBtn.setText(consolemode);

    consolemode is a string or where did you define it?

    Could you put the error that you get?

    • 0