此 DialogFragment 实现会导致
IllegalStateException("你不能设置 Dialog 的 OnCancelListener 或 OnDismissListener")
. 为什么?解决方案?
public class OkCThreadDialog1 extends DialogFragment{
DialogInterface.OnCancelListener onCancelListener;
public OkCThreadDialog1(){
}
public static OkCThreadDialog1 newInstance(String title, String message) {
OkCThreadDialog1 frag = new OkCThreadDialog1();
Bundle args = new Bundle();
args.putString("title", title);
args.putString("message", message);
frag.setArguments(args);
return frag;
}
public Dialog onCreateDialog(Bundle savedInstanceState){
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
builder .setTitle(getArguments().getString("title"))
.setMessage(getArguments().getString("message"))
.setOnCancelListener(onCancelListener)
.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
}})
.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
getDialog().cancel();
}});
return builder.create();
}
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
// Verify that the host activity implements the callback interface
try {
onCancelListener = (DialogInterface.OnCancelListener) activity;
} catch (ClassCastException e) {
// The activity doesn't implement the interface, throw exception
throw new ClassCastException(activity.toString()
+ " must implement OkCancelDialogListener");
}
}
}
我的活动实现DialogInterface.OnCancelListener
如下:
public class MainActivity extends Activity implements OkCancelDialogListener{
static final String TAG ="MainActivity";
@Override
public void onCancel(DialogInterface dialog) {
}
}
从 抛出异常builder.create();
。怎么了?