从DialogFragment中的EditText中获取getText [英] getText from a EditText in a DialogFragment

问题描述

我有一个像这样的DialogFragment

I have a DialogFragment like this one

通过单击MainActivity中的加号"按钮来调用该对话框，该按钮最初为空.当我单击继续"时，我创建了一个按钮，到目前为止，它仍然有效.我还希望我在DialogFragment的EditText中插入的字符串显示在我刚创建的按钮上.我的问题是我无法检索在EditText中输入的字符串.

The Dialog is called by clicking on the "plus" button in the MainActivity below which is initially empty. When I click on "continue", I create a button and so far it works. I also wish that the string I insert in the EditText in DialogFragment is shown on the button I've just created. My problem is that I can not retrieve the string I entered in the EditText.

这是代码:

MainActivity

MainActivity

public class MainActivity extends FragmentActivity implements IProjectDialFrag {

    private ProjectDialogFragment projectDialFrag = new ProjectDialogFragment();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater inflater = getMenuInflater();
            inflater.inflate(R.menu.main, menu);
        return super.onCreateOptionsMenu(menu);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        int id = item.getItemId();

        switch (id) {
            case R.id.action_settings:
                //TODO
                return true;
            case R.id.filters:
                Intent intent1 = new Intent(MainActivity.this, FiltersActivity.class);
                startActivity(intent1);
                return true;
            case R.id.action_new:
                return true;
            case R.id.add_button:
                Intent intent2 = new Intent(MainActivity.this, ButtonsActivity.class);
                startActivity(intent2);
                return true;
            case R.id.add_project:
                projectDialFrag.show(getFragmentManager(), "projectDialog");
                return true;
            default:
                return super.onOptionsItemSelected(item);
        }

    }

    @Override
    public void onDialogNegativeClick(DialogFragment dialog) {
        return;
    }

    @Override
    public void onDialogPositiveClick(DialogFragment dialog) { 
        LayoutInflater inflater = LayoutInflater.from(this);
        View view = inflater.inflate(R.layout.project_dialog_fragment, null);

        EditText editText = (EditText) view.findViewById(R.id.project_name);
        String projectName = editText.getText().toString();
        Button projectButton = new Button(this);
        projectButton.setText(projectName);
        LinearLayout linearLayout = (LinearLayout) findViewById(R.id.main_layout);
        linearLayout.addView(projectButton);

    }

}

DialogFrament

DialogFrament

public class ProjectDialogFragment extends DialogFragment {

    private IProjectDialFrag iProjDialFrag;

    @SuppressLint("InflateParams")
    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
         AlertDialog.Builder createProjectAlert = new AlertDialog.Builder(getActivity());

         createProjectAlert.setTitle("Create Project");

         LayoutInflater inflater = getActivity().getLayoutInflater();

         createProjectAlert.setView(inflater.inflate(R.layout.project_dialog_fragment, null))

            .setPositiveButton(R.string.conti_nue, new DialogInterface.OnClickListener() {

                @Override
                public void onClick(DialogInterface dialog, int id) {
                    iProjDialFrag.onDialogPositiveClick(ProjectDialogFragment.this);
                }
            })
            .setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {

                @Override
                public void onClick(DialogInterface dialog, int id) {
                    iProjDialFrag.onDialogNegativeClick(ProjectDialogFragment.this);

                }
            });

         return createProjectAlert.create();

    }

    @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);
        iProjDialFrag = (IProjectDialFrag) activity;
    }

}

界面

public interface IProjectDialFrag {

    public void onDialogPositiveClick(DialogFragment dialog);
    public void onDialogNegativeClick(DialogFragment dialog);

}

和XML布局以供参考:

and the XML layout for reference:

DialogFragment布局

DialogFragment layout

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="vertical" >

    <EditText 
        android:id="@+id/project_name" 
        android:inputType="text"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="16dp"
        android:layout_marginLeft="4dp"
        android:layout_marginRight="4dp"
        android:layout_marginBottom="4dp"
        android:hint="@string/hint_project_alert" />

</LinearLayout>

MainActivity布局

MainActivity layout

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent" 
    android:orientation="horizontal"
    android:id="@+id/main_layout">

</LinearLayout>

我在哪里错了?

推荐答案

只需在对话框中调用findViewById:

EditText editText = (EditText) getDialog().findViewById(R.id.project_name);
if (editText != null) {
    Log.e("", "Value is: " + editText.getText());
} else {
    Log.e("", "EditText not found!");
}

注意:需要在onCreateDialog之后调用.

Note: needs to be called after onCreateDialog.

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