Question

我创建了一个DialogFragment。 Dialog有一个EditText，我从对话框xml中调用它。但是有错误：尝试在空对象引用上调用虚拟方法'android.text.Editable android.widget.EditText.getText（）'

此代码中的新内容：

    AlertDialog alertDialog;
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());

和

final EditText editText = (EditText) alertDialog.findViewById(R.id.editTextPasswordDeveloper);

我的代码：

public class DeveloperLoginDialogFragment extends DialogFragment {

EditText editText;

@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {

    final LayoutInflater inflaterDialog = getActivity().getLayoutInflater();

    AlertDialog alertDialog;
    AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());

    alertDialog = builder.create();

   // final AlertDialog alertDialog = new AlertDialog.Builder(getActivity());
    builder.setCancelable(false);
    builder.setView(inflaterDialog.inflate(R.layout.alertdialog_developer, null));
    final EditText editText = (EditText) alertDialog.findViewById(R.id.editTextPasswordDeveloper);
    builder.setTitle("Entwickler-Login");
    builder.setMessage("Um dich als Entwickler zu verifizieren, gib den Entwickler-Code bitte unten ein.");
    builder.setPositiveButton("Verifizieren", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {
            if(editText.getText().toString().equals("7846")) {
                dialog.dismiss();
                Toast.makeText(getActivity().getApplicationContext(),"Erfolgreich verifiziert!", Toast.LENGTH_LONG).show();
            }
        }
    });
    builder.setNegativeButton("Abbrechen", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {
            Intent intent = new Intent(getActivity(), MainActivity.class);
            startActivity(intent);
        }
    });
    return builder.create();
}

}

Answer 1

editText = (EditText) editText.findViewById(R.id.editTextPasswordDeveloper);

您正在findViewById()上呼叫editText，这是空的。您可能希望改为使用EditText editText = (EditText) alertDialog.findViewById(R.id.label_field);。

请注意使用alertDialog而不是editText。

Answer 2

问题很简单，您正在使用编辑文本来查找视图。你有两个选项可以膨胀布局然后使用findViewById或使用alertDialog.findViewById（）;

试试这个。

AlertDialog.Builder builder = new AlertDialog.Builder(FeedFragment.this.getActivity());
    builder.setView(R.layout.layout_edit_review);
    builder.setCancelable(true);
    Dialog dialog = builder.create();
    dialog.show();
    TextInputEditText text_edit = (TextInputEditText) dialog.findViewById(R.id.editReview);

尝试类似的东西。

尝试在空对象引用错误上调用虚拟方法'android.text.Editable android.widget.EditText.getText（）'

2 个答案: