EditText setText未显示在对话框片段上

Question

我是Android应用开发的新手，也不知道如何调试它。 所以我正在尝试在DialogFragment上执行EditText.setText。 它在日志上打印出正确的字符串，但仍显示基于.xml文件的旧字符串（“在此处输入项目”。）。 有什么办法可以更新吗？

public class MyAlertDialogFragment extends DialogFragment{
public MyAlertDialogFragment() {}

public static MyAlertDialogFragment newInstance(String desc) {
    MyAlertDialogFragment frag = new MyAlertDialogFragment();
    Bundle args = new Bundle();
    args.putString("desc", desc);
    frag.setArguments(args);
    return frag;
}

@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {

    AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(getActivity());
    alertDialogBuilder.setView(R.layout.custom_dialog);
    alertDialogBuilder.setTitle("Edit to-do list");

    final View layout = View.inflate(MainActivity.getAppContext(), R.layout.custom_dialog, null);
    final EditText mEditText = (EditText) layout.findViewById(R.id.EditDesc);
    String desc = getArguments().getString("desc");
    mEditText.setText(desc);
    System.out.println("EditText is " + mEditText.getText().toString());

    alertDialogBuilder.setPositiveButton("OK",  new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {
            // on success
            EditTodoFragment.EditTodoFragmentListener listener = (EditTodoFragment.EditTodoFragmentListener)getActivity();
            listener.onFinishEditDialog(mEditText.getText().toString());
        }
    });
    alertDialogBuilder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {
            dialog.dismiss();
        }
    });

    return alertDialogBuilder.create();
}

}

日志文件

07-06 21:04:20.738 4115-4115/com.example.light.todolist I/System.out: EditText is Doing grocery

xml文件是：

<TextView
    android:layout_width="238dp"
    android:layout_height="wrap_content"
    android:text="Edit Item Below:"
    android:id="@+id/EditTitle"
    android:layout_weight="0.04" />

<EditText
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/EditDesc"
    android:text="Enter item here.">
<requestFocus />
</EditText>

Answer 1

您不对Dialog使用布局视图，这样就看不到EditText上的文本。 请按此处更改：

 AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(getActivity());
    alertDialogBuilder.setTitle("Edit to-do list");

    final View layout = View.inflate(MainActivity.getAppContext(), R.layout.custom_dialog, null);
    alertDialogBuilder.setView(layout );

Answer 2

尝试这个：

AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(getActivity());

LayoutInflater inflater = getActivity().getLayoutInflater();
View customView = inflater.inflate(R.layout.custom_dialog, null);

alertDialogBuilder.setView(customView);
alertDialogBuilder.setTitle("Edit to-do list");

final EditText mEditText = (EditText) customView.findViewById(R.id.EditDesc);
String desc = getArguments().getString("desc");
mEditText.setText(desc);

alertDialogBuilder.setPositiveButton("OK",  new DialogInterface.OnClickListener() {
    @Override
    public void onClick(DialogInterface dialog, int which) {
        // on success
        EditTodoFragment.EditTodoFragmentListener listener = (EditTodoFragment.EditTodoFragmentListener)getActivity();
        listener.onFinishEditDialog(mEditText.getText().toString());
    }
});
alertDialogBuilder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
    @Override
    public void onClick(DialogInterface dialog, int which) {
        dialog.dismiss();
    }
});

return alertDialogBuilder.create();