通过 AlertDialogFragment 中的 Bundle 传递侦听器 - 这可能吗?
我有一个简单的类:
public class AlertDialogFragment extends DialogFragment {
private static final DialogInterface.OnClickListener DUMMY_ON_BUTTON_CLICKED_LISTENER = new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// do nothing
}
};
public static final class Builder implements Parcelable {
public static final Creator<Builder> CREATOR = new Creator<Builder>() {
@Override
public Builder createFromParcel(Parcel source) {
return new Builder(source);
}
@Override
public Builder[] newArray(int size) {
return new Builder[size];
}
};
private Optional<Integer> title;
private Optional<Integer> message;
private Optional<Integer> positiveButtonText;
private Optional<Integer> negativeButtonText;
public Builder() {
title = Optional.absent();
message = Optional.absent();
positiveButtonText = Optional.absent();
negativeButtonText = Optional.absent();
}
public Builder(Parcel in) {
title = (Optional<Integer>) in.readSerializable();
message = (Optional<Integer>) in.readSerializable();
positiveButtonText = (Optional<Integer>) in.readSerializable();
negativeButtonText = (Optional<Integer>) in.readSerializable();
}
@Override
public void writeToParcel(Parcel out, int flags) {
out.writeSerializable(title);
out.writeSerializable(message);
out.writeSerializable(positiveButtonText);
out.writeSerializable(negativeButtonText);
}
@Override
public int describeContents() {
return 0;
}
public Builder withTitle(Integer title) {
this.title = Optional.fromNullable(title);
return this;
}
public Builder withMessage(Integer message) {
this.message = Optional.fromNullable(message);
return this;
}
public Builder withPositiveButton(int buttonText) {
this.positiveButtonText = Optional.fromNullable(buttonText);
return this;
}
public Builder withNegativeButton(int buttonText) {
this.negativeButtonText = Optional.fromNullable(buttonText);
return this;
}
private void set(AlertDialog.Builder dialogBuilder, final AlertDialogFragment alertDialogFragment) {
if (title.isPresent()) {
dialogBuilder.setTitle(title.get());
}
if (message.isPresent()) {
dialogBuilder.setMessage(message.get());
}
if (positiveButtonText.isPresent()) {
dialogBuilder.setPositiveButton(positiveButtonText.get(), new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
alertDialogFragment.onPositiveButtonClickedListener.onClick(dialog, which);
}
});
}
if (negativeButtonText.isPresent()) {
dialogBuilder.setNegativeButton(negativeButtonText.get(), new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
alertDialogFragment.onNegativeButtonClickedListener.onClick(dialog, which);
}
});
}
}
public AlertDialogFragment build() {
return AlertDialogFragment.newInstance(this);
}
}
private static final String KEY_BUILDER = "builder";
private DialogInterface.OnClickListener onPositiveButtonClickedListener = DUMMY_ON_BUTTON_CLICKED_LISTENER;
private DialogInterface.OnClickListener onNegativeButtonClickedListener = DUMMY_ON_BUTTON_CLICKED_LISTENER;
private static AlertDialogFragment newInstance(Builder builder) {
Bundle args = new Bundle();
args.putParcelable(KEY_BUILDER, builder);
AlertDialogFragment fragment = new AlertDialogFragment();
fragment.setArguments(args);
return fragment;
}
public void setOnPositiveButtonClickedListener(DialogInterface.OnClickListener listener) {
this.onPositiveButtonClickedListener = listener != null ? listener : DUMMY_ON_BUTTON_CLICKED_LISTENER;
}
public void setOnNegativeButtonClickedListener(DialogInterface.OnClickListener listener) {
this.onNegativeButtonClickedListener = listener != null ? listener : DUMMY_ON_BUTTON_CLICKED_LISTENER;
}
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(getActivity());
Builder builder = getArguments().getParcelable(KEY_BUILDER);
builder.set(alertDialogBuilder, this);
return alertDialogBuilder.create();
}
}
现在我必须设置按钮点击监听器直接进入,因为我无法通过(args)传递监听器。但是我想 - 所以它看起来像实例化一个:SimpleDialogFragment
Bundle
AlertDialog
AlertDialogFragment dialogFragment = new AlertDialogFragment.Builder()
.withTitle(R.string.no_internet_connection)
.withMessage(messageId)
.withPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
}).build();
dialogFragment.show(getSupportFragmentManager(), FRAGMENT_TAG_NO_INTERNET_CONNECTION);
但现在我应该这样设置侦听器:
AlertDialogFragment dialogFragment = new AlertDialogFragment.Builder()
.withTitle(R.string.no_internet_connection)
.withMessage(messageId)
.withPositiveButton(android.R.string.ok)
.build();
dialogFragment.setOnPositiveButtonClickListener(new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
dialogFragment.show(getSupportFragmentManager(), FRAGMENT_TAG_NO_INTERNET_CONNECTION);
也许设置按钮单击侦听器直接到实例,而不是通过参数传递它们是不安全的,因为将参数传递给的推荐方法是通过参数传递它们。DialogFragment
Bundle
Fragment
Bundle
而且我知道,在Android中与s通信的推荐方法是强制主机活动实现回调接口。但是,这样就不清楚 Activity 是否应该实现此接口,直到在运行时抛出为止。而且它还具有很强的依赖性 - 要在活动之外的某个地方使用它,我应该在活动中实现接口。所以我不能在“独立于”主机活动中使用它:Fragment
ClassCastException
Callback
Fragment
prepareAlertDialogFragment().show(getActivity().getSupportFragmentManager(), "tag");