禁用 DialogFragment 中的正/负按钮

Question

我模仿了我认为相当标准的Dialog 代码：

public class DChooseSeparator extends DialogFragment
{
    // ...
    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) 
    {
        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
        LayoutInflater inflater = getActivity().getLayoutInflater();

        builder
            .setTitle("My Title")
            .setView(myDialogLayout)
            .setPositiveButton(getString(R.string.sOKButton), new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                    if(myEditText.getText().toString().equals("")) // disable positive button if this is empty
                    {
                        Toast.makeText(getActivity(), "enter something!", Toast.LENGTH_SHORT).show();
                    }
                    else { myListener.onSet(myEditText.getText().toString()); }
                }
            })
            .setNegativeButton(getString(R.string.sCancelButton), new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                    // do nothing
                }
            });

        return builder.create();
    }
}

在onStart 中显示它的Fragment：

sepButton.setOnClickListener(new OnClickListener() {
    @Override
    public void onClick(View v) {
        MyDialog myDialog = new MyDialog();
        myDialog.show(getFragmentManager(), "tMyDialogTag");
        myDialog.getButton(Dialog.BUTTON_POSITIVE).setEnabled(false);   // DOES NOT WORK
    }
}

但是，这不起作用，因为getButton 功能不适用于我的DialogFragment。我也不能在DialogFragment 类中执行此操作，因为我需要先show()。

那么...我究竟可以/应该在哪里禁用Button？我真的必须将Dialog 的整个创建移到onClick 方法吗？

提前感谢您的帮助。

Answer 1

您可以在创建FragmentDialog 的视图后启用或禁用Button。所以你必须在 Dialog 的 onStart() 方法中调用它。

查看我的代码：

public class DChooseSeparator extends DialogFragment
{
    // MEMBER
    private AlertDialog dialog;
    private static boolean mEnableButton;

    // You need an empty constructor: "All subclasses of Fragment must include a public empty constructor. "  
    // like it's described in the Fragment API -> so create a new Insatnce with this static methjod
    public static DChooseSeparator newInstance(boolean enableButton){
        mEnableButton = enableButton;
        return new DChooseSeparator();
    } 
    // ...
    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) 
    {
        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
        LayoutInflater inflater = getActivity().getLayoutInflater();

        builder
            .setTitle("My Title")
            .setView(myDialogLayout)
            .setPositiveButton(getString(R.string.sOKButton), new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                    if(myEditText.getText().toString().equals("")) // disable positive button if this is empty
                    {
                        Toast.makeText(getActivity(), "enter something!", Toast.LENGTH_SHORT).show();
                    }
                    else { myListener.onSet(myEditText.getText().toString()); }
                }
            })
            .setNegativeButton(getString(R.string.sCancelButton), new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                    // do nothing
                }
            });

        dialog = builder.create()

        return dialog;
    }

    @Override
    public void onStart(){
        super.onStart();
        dialog.getButton(Dialog.BUTTON_POSITIVE).setEnabled(mEnableButton);
    }
}

现在你可以像这样调用你的对话框：

sepButton.setOnClickListener(new OnClickListener() {
    @Override
    public void onClick(View v) {
        MyDialog myDialog = new MyDialog(false);
        myDialog.show(getFragmentManager(), "tMyDialogTag");
    }
}

Answer 2

你需要在对话框的视图被创建后，在 dialogfragment 类的 oncreateview 函数中调用它