Android 在DialogFragment中禁用正/负按钮
我模仿了我认为相当标准的Android 在DialogFragment中禁用正/负按钮,android,android-fragments,android-dialog,android-dialogfragment,Android,Android Fragments,Android Dialog,Android Dialogfragment,我模仿了我认为相当标准的Dialogcode: public class DChooseSeparator extends DialogFragment { // ... @Override public Dialog onCreateDialog(Bundle savedInstanceState) { AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
Dialog
code:
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();
}
}
在显示它的片段的onStart
中:
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,因为我的DialogFragment
无法使用getButton
功能。我也不能在DialogFragment
类中执行此操作,因为我需要先show()
it
那么…我到底可以/应该在哪里禁用按钮
?我真的必须将对话框的整个创建过程移动到onClick
方法吗
提前感谢您的帮助。您需要在对话框视图创建后调用此函数,在dialogfragment类的oncreateview函数中,您可以在FragmentDialog
视图创建后启用或禁用按钮。因此,您必须在对话框的onStart()
方法中调用它
请参阅我的代码:
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,您可以这样调用对话框:
sepButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
MyDialog myDialog = new MyDialog(false);
myDialog.show(getFragmentManager(), "tMyDialogTag");
}
}
但是我该把节目放在哪里呢?我在创建对话框的片段中找到了它,但是现在如果我想在onCreateView
中做一些事情,它就不起作用了。保持原样,向我们的MyDialog类setOkEnabled(bool val)添加一个函数,然后将这个标志值存储在某个地方,然后覆盖onCreateView,如果该标志为false,则禁用ok按钮右侧,我已经按照您的建议执行了操作,并添加了该函数,并在myDialog.show(…)
之后调用了该函数。但是,这也不起作用,因为应用程序在我一调用它就崩溃了。非常感谢您的详细回答,感谢您在示例中花时间解决这个问题!这确实有效(尽管我想我也试过)。我想知道……这是推荐的方法吗,还是您应该直接在片段中为对话框创建代码?