Question

我正在尝试创建一个片段，在显示时，根据我传递给show()方法的额外项目更改其内容。保留对话框片段实例以保证可重用性，换句话说，我只是实例化片段一次并使用它显示的新对象调用show()。它第一次显示时效果很好，但是对于后续的show调用，我只是无法更改编辑文本的文本。您将在下面的课程中看到我实际上明确地将文本更改为show()代码块之后的“我已被更改”，但这绝不会在ui中反映出来。

public class RegisterFragment extends DialogFragment implements View.OnClickListener, DialogInterface.OnClickListener
    {
    private static final String KEY_SOURCE = "source";
    private static String source;
    private static JSONObject listEntry;
    private RegisterItem item;

    private boolean spinnerMode;
    private boolean viewsCreated;

    private TextView label1, label2;
    private EditText field1 = null, field2 = null;
    private Spinner spinner;
    private ArrayAdapter<String> adapter;
    private Button send, cancel;

    private OnClickSendCancelButtonListener sendListener;

    public static RegisterFragment newInstance(String source)
        {
        RegisterFragment fragment = new RegisterFragment();
        Bundle b = new Bundle();
        b.putString(KEY_SOURCE, source);
        fragment.setArguments(b);
        return fragment;
        }
    @Override
    public void onCreate(Bundle savedInstanceState)
        {
        super.onCreate(savedInstanceState);

        Bundle b = this.getArguments();
        if (b != null)
            {
            source = b.getString(KEY_SOURCE);
            load(source);
            }
        adapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_spinner_item);
        adapter.setDropDownViewResource(android.R.layout.simple_dropdown_item_1line);
        viewsCreated = false;
        }


    public RegisterItem getRegisterItem()
        {
        return this.item;   
        }


    @Override
    public void onAttach(Activity activity)
        {
        super.onAttach(activity);

        try
            {
            this.sendListener = (OnClickSendCancelButtonListener) activity;
            }
        catch (ClassCastException e)
            {
            throw new ClassCastException("Activity must implement RegisterFragment#OnClickSendCancelButtonListener");
            }
        }

    private void load(String source)
        {
        if (item == null)
            item = new RegisterItem();
        item.loadData(source);
        spinnerMode = item.hasChoices();

        if (!viewsCreated)
            return;

        label1.setText(item.field1Label);
        label2.setText(item.field2Label);

        send.setText(item.sendButtonText);
        cancel.setText(item.cancelButtonText);

        Log.v("RegisterFragment", "FIELD1: " + item.defaultField1);
        Log.v("RegisterFragment", "FIELD2: " + item.defaultField2);

        if (spinnerMode)
            {
            field1.setVisibility(View.GONE);
            spinner.setVisibility(View.VISIBLE);

            adapter.clear();
            for(String choice: item.choices)
                adapter.add(choice);
            adapter.notifyDataSetChanged();
            }
        else
            {
            field1.setVisibility(View.VISIBLE);
            spinner.setVisibility(View.GONE);
            }

        if (item.hasDefaults())
            {
            Log.v("RegisterFragment", "Setting text for field 2");
            field2.setText(item.defaultField2);
            Log.v("RegisterFragment", "FIELD2 TEXT: " + field2.getText().toString());
            if (spinnerMode)
                spinner.setSelection(adapter.getPosition(item.defaultField2));
            else
                field1.setText(item.defaultField1);
            }
        }

    public void show(FragmentManager manager, String tag, String source, String listEntry)
        {
        Log.v("Register Fragment", "Showing fragment\nSOURCE STRING: " + source);
        load(source);
        RegisterFragment.source = source;
        try {
            RegisterFragment.listEntry = new JSONObject(listEntry);
        } catch (JSONException e) {
            e.printStackTrace();
        }
        super.show(manager, tag);
        if (field2 != null)
            field2.setText("I Have Been Changed");
        }


    @Override
    public void dismiss()
        {
        if (field1 != null)
            field1.setText("");
        if (field2 != null)
            field2.setText("");
        super.dismiss();
        }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
        {
        View v = inflater.inflate(R.layout.register_screen, null);

        spinner = (Spinner) v.findViewById(R.id.register_spinner);
        spinner.setAdapter(adapter);

        label1 = (TextView) v.findViewById(R.id.register_label1);
        label2 = (TextView) v.findViewById(R.id.register_label2);

        field1 = (EditText) v.findViewById(R.id.register_field1);
        field2 = (EditText) v.findViewById(R.id.register_field2);

        send = (Button) v.findViewById(R.id.register_send);
        cancel = (Button) v.findViewById(R.id.register_cancel);

        send.setOnClickListener(this);
        cancel.setOnClickListener(this);

        viewsCreated = true;
        load(source);

        return v;
        }

    @Override
    public void onDestroyView() {
        super.onDestroyView();
        viewsCreated = false;
    }
    }

Answer 1

您的代码应该有效。但是试试这个。

EditText text = (EditText)getDialog().findViewById(R.id.register_field2);
text.setText("I have been changed");

当我使用显式setText调用调用show方法时，Android DialogFragment视图不会更新

1 个答案: