get a value from a CheckBox in Android
I would like to get the booleanvalue of my checkbox that is in my Fragment and get that value in MainActivity . The Fragment is related to an Activity.
Fragment:
@Override
public void onCreate (@Nullable Bundle savedInstanceState)
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.preferences);
}
Activity
@Override
protected void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
getFragmentManager().beginTransaction().replace(android.R.id.content,
new MyPreferenceFragment()).commit();
Can someone please explain to me how i make it. I just tried with an Interface but i got always a null error like the checkbox isnt initialize
java
android I would like to get the booleanvalue of my checkbox that is in my Fragment and get that value in MainActivity . The Fragment is related to an Activity.
Fragment:
@Override
public void onCreate (@Nullable Bundle savedInstanceState)
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.preferences);
Activity
@Override
protected void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
getFragmentManager().beginTransaction().replace(android.R.id.content,
new MyPreferenceFragment()).commit();
Can someone please explain to me how i make it. I just tried with an Interface but i got always a null error like the checkbox isnt initialize
java
android share
Activity
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getFragmentManager().beginTransaction().replace(android.R.id.content,
new MyPreferenceFragment()).commit();
Can someone please explain to me how i make it. I just tried with an Interface but i got always a null error like the checkbox isnt initialize
java
android java
android edited Nov 13 '18 at 18:43
Mat
1,31032030
asked Nov 13 '18 at 16:07
Marco SchwarzMarco Schwarz
114
edited Nov 13 '18 at 18:43
Mat
1,31032030
asked Nov 13 '18 at 16:07
Marco SchwarzMarco Schwarz
114
edited Nov 13 '18 at 18:43
Mat
1,31032030
edited Nov 13 '18 at 18:43
Mat
1,31032030
edited Nov 13 '18 at 18:43
Mat
1,31032030
1,31032030
asked Nov 13 '18 at 16:07
Marco SchwarzMarco Schwarz
114
asked Nov 13 '18 at 16:07
Marco SchwarzMarco Schwarz
114
asked Nov 13 '18 at 16:07
Marco SchwarzMarco Schwarz
114
114
add a comment |
You should look into how to define and use callbacks Look here
– Haroun Hajem
Nov 13 '18 at 16:32
You should look into how to define and use callbacks Look here
– Haroun Hajem
Nov 13 '18 at 16:32
You should look into how to define and use callbacks Look here
– Haroun Hajem
Nov 13 '18 at 16:32
add a comment |
2 Answers
2
active
oldest
votes
I believe you are using PreferenceFragmentCompat. In the documentation I see that one can findPreference by using the method findPreference(key) findPreference(java.lang.CharSequence).
findPreference returns a Preference object that would give you values.
answered Nov 13 '18 at 16:27
Gaurav VashisthGaurav Vashisth
3,95052650
add a comment |
This is how you bind and get the value of a checkbox :
Checkbox cb = (CheckBox)findViewById(R.id.yourCheckBox);
boolean checkboxState = cb.isChecked();
now in order to pass that information to your activity with callbacks, you do the following:
in your fragment create an interface:
public interface MyInterface
public void onMyInterface(boolean b);
in the onAttach() method include the following:
MyInterface myInterface;
@Override
public void onAttach(Context context)
super.onAttach(context);
myInterface = (MyInterface) context;
when you need to send the data to the activity, within your fragment add the following:
sendBooleanCheckBox(checkBoxState);
where:
public void sendBooleanCheckBox(boolean b)
myInterface.onMyInterface(b);
and in your activity:
@Override
public void onMyInterface(boolean b)
Log.d("TAG","check box value is: " + b);
make sure that your activity implements the interface:
public MyActivity implements OnMyInterface {...
answered Nov 13 '18 at 16:34
Nikos HidalgoNikos Hidalgo
918115
Thanks a lot, so i did but now can you say me how i can use the method onMyInterface? Because when i try with it i get nothing
– Marco Schwarz
Nov 13 '18 at 17:59
that method is your callback method, so when you use it in the fragment, the activity listens and fires the same method. Right now the method on the activity only prints out the value of your boolean variable to the log, but you can use that value to do whatever you want with it. For example, define a variable in your Activity class boolean checkBoxValue; then within the @override public void onMyInterface(boolean b) checkBoxValue = b; and use that value from there.
– Nikos Hidalgo
Nov 14 '18 at 9:40
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
I believe you are using PreferenceFragmentCompat. In the documentation I see that one can findPreference by using the method findPreference(key) findPreference(java.lang.CharSequence).
findPreference returns a Preference object that would give you values.
answered Nov 13 '18 at 16:27
Gaurav VashisthGaurav Vashisth
3,95052650
add a comment |
I believe you are using PreferenceFragmentCompat. In the documentation I see that one can findPreference by using the method findPreference(key) findPreference(java.lang.CharSequence).
findPreference returns a Preference object that would give you values.
answered Nov 13 '18 at 16:27
Gaurav VashisthGaurav Vashisth
3,95052650
add a comment |
I believe you are using PreferenceFragmentCompat. In the documentation I see that one can findPreference by using the method findPreference(key) findPreference(java.lang.CharSequence).
findPreference returns a Preference object that would give you values.
answered Nov 13 '18 at 16:27
Gaurav VashisthGaurav Vashisth
3,95052650
I believe you are using PreferenceFragmentCompat. In the documentation I see that one can findPreference by using the method findPreference(key) findPreference(java.lang.CharSequence).
findPreference returns a Preference object that would give you values.
answered Nov 13 '18 at 16:27
Gaurav VashisthGaurav Vashisth
3,95052650
answered Nov 13 '18 at 16:27
Gaurav VashisthGaurav Vashisth
3,95052650
answered Nov 13 '18 at 16:27
Gaurav VashisthGaurav Vashisth
3,95052650
answered Nov 13 '18 at 16:27
Gaurav VashisthGaurav Vashisth
3,95052650
3,95052650
add a comment |
add a comment |
This is how you bind and get the value of a checkbox :
Checkbox cb = (CheckBox)findViewById(R.id.yourCheckBox);
boolean checkboxState = cb.isChecked();
now in order to pass that information to your activity with callbacks, you do the following:
in your fragment create an interface:
public interface MyInterface
public void onMyInterface(boolean b);
in the onAttach() method include the following:
MyInterface myInterface;
@Override
public void onAttach(Context context)
super.onAttach(context);
myInterface = (MyInterface) context;
when you need to send the data to the activity, within your fragment add the following:
sendBooleanCheckBox(checkBoxState);
where:
public void sendBooleanCheckBox(boolean b)
myInterface.onMyInterface(b);
and in your activity:
@Override
public void onMyInterface(boolean b)
Log.d("TAG","check box value is: " + b);
make sure that your activity implements the interface:
public MyActivity implements OnMyInterface {...
answered Nov 13 '18 at 16:34
Nikos HidalgoNikos Hidalgo
918115
Thanks a lot, so i did but now can you say me how i can use the method onMyInterface? Because when i try with it i get nothing
– Marco Schwarz
Nov 13 '18 at 17:59
that method is your callback method, so when you use it in the fragment, the activity listens and fires the same method. Right now the method on the activity only prints out the value of your boolean variable to the log, but you can use that value to do whatever you want with it. For example, define a variable in your Activity class boolean checkBoxValue; then within the @override public void onMyInterface(boolean b) checkBoxValue = b; and use that value from there.
– Nikos Hidalgo
Nov 14 '18 at 9:40
add a comment |
This is how you bind and get the value of a checkbox :
Checkbox cb = (CheckBox)findViewById(R.id.yourCheckBox);
boolean checkboxState = cb.isChecked();
now in order to pass that information to your activity with callbacks, you do the following:
in your fragment create an interface:
public interface MyInterface
public void onMyInterface(boolean b);
in the onAttach() method include the following:
MyInterface myInterface;
@Override
public void onAttach(Context context)
super.onAttach(context);
myInterface = (MyInterface) context;
when you need to send the data to the activity, within your fragment add the following:
sendBooleanCheckBox(checkBoxState);
where:
public void sendBooleanCheckBox(boolean b)
myInterface.onMyInterface(b);
and in your activity:
@Override
public void onMyInterface(boolean b)
Log.d("TAG","check box value is: " + b);
make sure that your activity implements the interface:
public MyActivity implements OnMyInterface {...
answered Nov 13 '18 at 16:34
Nikos HidalgoNikos Hidalgo
918115
Thanks a lot, so i did but now can you say me how i can use the method onMyInterface? Because when i try with it i get nothing
– Marco Schwarz
Nov 13 '18 at 17:59
that method is your callback method, so when you use it in the fragment, the activity listens and fires the same method. Right now the method on the activity only prints out the value of your boolean variable to the log, but you can use that value to do whatever you want with it. For example, define a variable in your Activity class boolean checkBoxValue; then within the @override public void onMyInterface(boolean b) checkBoxValue = b; and use that value from there.
– Nikos Hidalgo
Nov 14 '18 at 9:40
add a comment |
This is how you bind and get the value of a checkbox :
Checkbox cb = (CheckBox)findViewById(R.id.yourCheckBox);
boolean checkboxState = cb.isChecked();
now in order to pass that information to your activity with callbacks, you do the following:
in your fragment create an interface:
public interface MyInterface
public void onMyInterface(boolean b);
in the onAttach() method include the following:
MyInterface myInterface;
@Override
public void onAttach(Context context)
super.onAttach(context);
myInterface = (MyInterface) context;
when you need to send the data to the activity, within your fragment add the following:
sendBooleanCheckBox(checkBoxState);
where:
public void sendBooleanCheckBox(boolean b)
myInterface.onMyInterface(b);
and in your activity:
@Override
public void onMyInterface(boolean b)
Log.d("TAG","check box value is: " + b);
make sure that your activity implements the interface:
public MyActivity implements OnMyInterface {...
answered Nov 13 '18 at 16:34
Nikos HidalgoNikos Hidalgo
918115
This is how you bind and get the value of a checkbox :
Checkbox cb = (CheckBox)findViewById(R.id.yourCheckBox);
boolean checkboxState = cb.isChecked();
now in order to pass that information to your activity with callbacks, you do the following:
in your fragment create an interface:
public interface MyInterface
public void onMyInterface(boolean b);
in the onAttach() method include the following:
MyInterface myInterface;
@Override
public void onAttach(Context context)
super.onAttach(context);
myInterface = (MyInterface) context;
when you need to send the data to the activity, within your fragment add the following:
sendBooleanCheckBox(checkBoxState);
where:
public void sendBooleanCheckBox(boolean b)
myInterface.onMyInterface(b);
and in your activity:
@Override
public void onMyInterface(boolean b)
Log.d("TAG","check box value is: " + b);
make sure that your activity implements the interface:
public MyActivity implements OnMyInterface {...
answered Nov 13 '18 at 16:34
Nikos HidalgoNikos Hidalgo
918115
answered Nov 13 '18 at 16:34
Nikos HidalgoNikos Hidalgo
918115
answered Nov 13 '18 at 16:34
Nikos HidalgoNikos Hidalgo
918115
answered Nov 13 '18 at 16:34
Nikos HidalgoNikos Hidalgo
918115
918115
Thanks a lot, so i did but now can you say me how i can use the method onMyInterface? Because when i try with it i get nothing
– Marco Schwarz
Nov 13 '18 at 17:59
that method is your callback method, so when you use it in the fragment, the activity listens and fires the same method. Right now the method on the activity only prints out the value of your boolean variable to the log, but you can use that value to do whatever you want with it. For example, define a variable in your Activity class boolean checkBoxValue; then within the @override public void onMyInterface(boolean b) checkBoxValue = b; and use that value from there.
– Nikos Hidalgo
Nov 14 '18 at 9:40
add a comment |
Thanks a lot, so i did but now can you say me how i can use the method onMyInterface? Because when i try with it i get nothing
– Marco Schwarz
Nov 13 '18 at 17:59
that method is your callback method, so when you use it in the fragment, the activity listens and fires the same method. Right now the method on the activity only prints out the value of your boolean variable to the log, but you can use that value to do whatever you want with it. For example, define a variable in your Activity class boolean checkBoxValue; then within the @override public void onMyInterface(boolean b) checkBoxValue = b; and use that value from there.
– Nikos Hidalgo
Nov 14 '18 at 9:40
Thanks a lot, so i did but now can you say me how i can use the method onMyInterface? Because when i try with it i get nothing
– Marco Schwarz
Nov 13 '18 at 17:59
Thanks a lot, so i did but now can you say me how i can use the method onMyInterface? Because when i try with it i get nothing
– Marco Schwarz
Nov 13 '18 at 17:59
that method is your callback method, so when you use it in the fragment, the activity listens and fires the same method. Right now the method on the activity only prints out the value of your boolean variable to the log, but you can use that value to do whatever you want with it. For example, define a variable in your Activity class boolean checkBoxValue; then within the @override public void onMyInterface(boolean b) checkBoxValue = b; and use that value from there.
– Nikos Hidalgo
Nov 14 '18 at 9:40
that method is your callback method, so when you use it in the fragment, the activity listens and fires the same method. Right now the method on the activity only prints out the value of your boolean variable to the log, but you can use that value to do whatever you want with it. For example, define a variable in your Activity class boolean checkBoxValue; then within the @override public void onMyInterface(boolean b) checkBoxValue = b; and use that value from there.
– Nikos Hidalgo
Nov 14 '18 at 9:40
add a comment |
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You should look into how to define and use callbacks Look here
– Haroun Hajem
Nov 13 '18 at 16:32