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我遇到了一個問題，我想將Set從DialogFragment回傳給最初調用它的Fragment。將參數從DialogFragment傳遞到片段
我已經嘗試過實現一個接口，但我似乎無法讓它從片段中正常工作。
是否有另一種方法來自DialogFragment >>Fragment？或者我需要實現Activity上的接口，然後從那裏移動它？
這個問題似乎是NullPointerException，我非常肯定這是因爲接口需要在活動級別實現，而不是在碎片上實現。點擊對話框的「正面按鈕」時發生崩潰。
DIALOGFRAGMENT
public class CustomPermissionDialog extends DialogFragment implements
OnCheckedChangeListener {
String _permission;
View convertView;
AlertDialog.Builder builder;
Switch alertDelete;
Set<String> permSet = new TreeSet<String>();
public static interface OnCompleteDialogInterface {
public abstract void OnCompleteDialog(Set mPermSet);
}
private OnCompleteDialogInterface mInterface;
public CustomPermissionDialog(Context context, String permissionName) {
_permission = permissionName;
mInterface = (OnCompleteDialogInterface) getActivity();
// TODO Auto-generated constructor stub
}
public Dialog onCreateDialog(Bundle savedInstanceState) {
LayoutInflater inflater = getActivity().getLayoutInflater();
builder = new AlertDialog.Builder(getActivity());
if (_permission == "Alerts") {
convertView = (View) inflater
.inflate(
getResources().getLayout(
R.layout.alerts_perm_dialog), null);
alertDelete = (Switch) convertView
.findViewById(R.id.switchAlertDelete);
alertDelete.setOnCheckedChangeListener(this);
}
if (_permission == "Automation") {
convertView = (View) inflater.inflate(
getResources().getLayout(R.layout.automation_perm_dialog),
null);
}
if (_permission == "Books") {
convertView = (View) inflater.inflate(
getResources().getLayout(R.layout.books_perm_dialog), null);
}
if (_permission == "Codes") {
convertView = (View) inflater.inflate(
getResources().getLayout(R.layout.codes_perm_dialog), null);
}
if (_permission == "DBS") {
convertView = (View) inflater.inflate(
getResources().getLayout(R.layout.dbs_perm_dialog), null);
}
if (_permission == "Feedback") {
convertView = (View) inflater.inflate(
getResources().getLayout(R.layout.feedback_perm_dialog),
null);
}
if (_permission == "Groups") {
convertView = (View) inflater
.inflate(
getResources().getLayout(
R.layout.groups_perm_dialog), null);
}
if (_permission == "Inventory") {
convertView = (View) inflater.inflate(
getResources().getLayout(R.layout.inventory_perm_dialog),
null);
}
if (_permission == "Jobs") {
convertView = (View) inflater.inflate(
getResources().getLayout(R.layout.jobs_perm_dialog), null);
}
if (_permission == "Locations") {
convertView = (View) inflater.inflate(
getResources().getLayout(R.layout.locations_perm_dialog),
null);
}
if (_permission == "Logs") {
convertView = (View) inflater.inflate(
getResources().getLayout(R.layout.logs_perm_dialog), null);
}
if (_permission == "Messages") {
convertView = (View) inflater.inflate(
getResources().getLayout(R.layout.messages_perm_dialog),
null);
}
if (_permission == "Services") {
convertView = (View) inflater.inflate(
getResources().getLayout(R.layout.services_perm_dialog),
null);
}
if (_permission == "Settings") {
convertView = (View) inflater.inflate(
getResources().getLayout(R.layout.settings_perm_dialog),
null);
}
if (_permission == "Templates") {
convertView = (View) inflater.inflate(
getResources().getLayout(R.layout.templates_perm_dialog),
null);
}
if (_permission == "Tools") {
convertView = (View) inflater.inflate(
getResources().getLayout(R.layout.tools_perm_dialog), null);
}
if (_permission == "Updates") {
convertView = (View) inflater.inflate(
getResources().getLayout(R.layout.updates_perm_dialog),
null);
}
if (_permission == "Users") {
convertView = (View) inflater.inflate(
getResources().getLayout(R.layout.users_perm_dialog), null);
}
// defining the alertdialog
builder.setTitle(_permission + " Permissions");
builder.setView(convertView);
builder.setPositiveButton(R.string.accept,
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
// do something with the new note
mInterface.OnCompleteDialog(permSet);
}
}).setNegativeButton(R.string.cancel,
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
// User cancelled the dialog
}
});
return builder.create();
}
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
// TODO Auto-generated method stub
if (alertDelete.isChecked()) {
// The toggle is enabled
permSet.add("alert_delete");
Log.e("ALERTDELETE", "CHECKED");
} else {
// The toggle is disabled
permSet.remove("alert_delete");
Log.e("ALERTDELETE", "UNCHECKED");
}
}
}
INSIDE片段
@Override
public void OnCompleteDialog(Set mPermSet) {
// TODO Auto-generated method stub
this.permSet = mPermSet;
String tempPermString = permSet.toString();
Log.e("PERMISSIONS", tempPermString);
}
堆棧跟蹤
10-30 11:41:30.081: E/AndroidRuntime(16925): FATAL EXCEPTION: main
10-30 11:41:30.081: E/AndroidRuntime(16925): Process: com.e.main, PID: 16925
10-30 11:41:30.081: E/AndroidRuntime(16925): java.lang.NullPointerException
10-30 11:41:30.081: E/AndroidRuntime(16925): at com.e.dialog.CustomPermissionDialog$1.onClick(CustomPermissionDialog.java:171)
10-30 11:41:30.081: E/AndroidRuntime(16925): at com.android.internal.app.AlertController$ButtonHandler.handleMessage(AlertController.java:166)
10-30 11:41:30.081: E/AndroidRuntime(16925): at android.os.Handler.dispatchMessage(Handler.java:102)
10-30 11:41:30.081: E/AndroidRuntime(16925): at android.os.Looper.loop(Looper.java:136)
10-30 11:41:30.081: E/AndroidRuntime(16925): at android.app.ActivityThread.main(ActivityThread.java:5105)
10-30 11:41:30.081: E/AndroidRuntime(16925): at java.lang.reflect.Method.invokeNative(Native Method)
10-30 11:41:30.081: E/AndroidRuntime(16925): at java.lang.reflect.Method.invoke(Method.java:515)
10-30 11:41:30.081: E/AndroidRuntime(16925): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:792)
10-30 11:41:30.081: E/AndroidRuntime(16925): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:608)
您是否考慮使用應用程序類？ – 2014-10-30 15:45:02
我沒有。我創建了一個，但我不確定要採取哪些步驟才能使其按需執行。 – 2014-10-30 15:48:18
當您回到片段時，將所需信息存儲在全局變量中，您可以從該變量中檢索數據 – 2014-10-30 15:51:05