如何在 DialogFragment 中访问 EditText 数据

Question

我的问题是如何获取用户输入到我的EditText 的数据，然后使用Toast.makeTest 方法显示数据。

我不知道如何访问片段中的EditText 这个链接对我不起作用： getText from a EditText in a DialogFragment

这是我的代码：

public class FragmentDialog extends DialogFragment {
EditText entry;
    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
    @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState)

 {
    AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
    builder.setView(R.layout.alert_dialog).setTitle("Add your text").setMessage("HElllloooooooo").setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialogInterface, int i) {
            Toast.makeText(getActivity(), entry.getText().toString(), Toast.LENGTH_SHORT).show();
        }
    }).setPositiveButton("ADD", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialogInterface, int i) {
            Toast.makeText(getActivity(),  entry.getText().toString(), Toast.LENGTH_SHORT).show();
        }
    });
    return builder.create();
}
}

Answer 1

编辑文本的工作原理：

首先你应该绑定它：

entry =  view.findViewById(R.id.MyEdtText);

其次要访问编辑中的书面数据（文本），您应该调用：

entry.getText().toString()

要在 Toast 中显示书面文本，您必须：

if(TextUtils.isEmpty(entry.getText().toString()){
     Toast.makeText(getActivity(), "No Text Entered", Toast.LENGTH_SHORT).show();
}
else{
    Toast.makeText(getActivity(), "The Text Entered Is"+  entry.getText().toString(), Toast.LENGTH_SHORT).show();
}

针对您的案例的具体解决方案是：

    public class FragmentDialog extends DialogFragment {
   private EditText entry;



    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
    @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)


    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState)

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

        LayoutInflater inflater = getActivity().getLayoutInflater();

        View DialogView = inflater.inflate(R.layout.alert_dialog,null);

        entry = DialogView.findViewById(R.id.entryEditText); // replace it with the correct XML ID

        builder.setView(DialogView).setTitle("Add your text").setMessage("HElllloooooooo").setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialogInterface, int i) {
                Toast.makeText(getActivity(), "canceled operation", Toast.LENGTH_SHORT).show();
            }
        }).setPositiveButton("ADD", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialogInterface, int i) {
                Toast.makeText(getActivity(), "the edit text value: "+entry.getText().toString(), Toast.LENGTH_SHORT).show();
            }
        });
        return builder.create();
    }
}

要显示对话框，请在您的活动中调用以下代码：

FragmentDialog dialog = new FragmentDialog();
dialog.show(getSupportFragmentManager(), "YourDialog");

概念证明（看看它是如何工作的）：

Answer 2

您必须在 onCreateView 上找到 ViewbyId，如下所示

  public class FragmentDialog extends DialogFragment {
    EditText entry;
        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                Bundle savedInstanceState) {
          View view = inflater.inflate(R.layout.fragment_username, container);
          entry = (EditText) view.findViewById(R.id.username);
          mEditText.requestFocus();

          return view;
        }}