I am have Fragment on the Activity. Fragment has button. if i click on the button, Fragment must be close. How i am did this?
public class ItemFragment extends Fragment{
private ImageView btnApply;
private ClickButton clickButton = new ClickButton();
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.item_info, container, false);
btnApply = (ImageView) rootView.findViewById(R.id.btnSendItem);
btnApply.setOnClickListener(clickButton);
return rootView;
}
private class ClickButton implements View.OnClickListener {
#Override
public void onClick(View v) {
if (R.id.btnSendItem == v.getId()) {
Toast.makeText(getActivity(),"CLOSE",Toast.LENGTH_LONG).show();
return;
}
}
}
}
There's no such thing like close the fragment, but you can remove the fragment from the stack. To pop the fragment use the following inside button click listener
getActivity().getFragmentManager().beginTransaction().remove(this).commit();
When this fragment is of type androidx.fragment.app.Fragment then this seems to work:
getActivity().getFragmentManager().popBackStack();
This pops the top visible fragment off the stack.
Related
i use tab layout matching this tutorial:
tab layout tutorial androidhive
It works fine, but when I add a button to fragment_one.xml , i cant use setOnClickListener for this button Because findViewById not work in MainActivity.java
the MainActivity bellow code:
public class MainActivity extends AppCompatActivity {
Button button;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ViewPager viewPager = (ViewPager) findViewById(R.id.viewpager);
setupViewPager(viewPager);
TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(viewPager);
button = (Button) findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action",Snackbar.LENGTH_LONG).setAction("Action", null).show();
}
});
}
the app stopped with this error:
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener' on a null object reference
Where should the button be defined and setOnClickListener?
Even though a fragment is hosted by an activity, it has its own layout (which is contained in the activity's layout) and therefore you'll have to define the fragment's view in its java class.
In most cases, a fragment would have its own Java class for you to manage and manipulate it, so in your case, it should look like this:
public class OneFragment extends Fragment{
public OneFragment() {
// Required empty public constructor
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view=inflater.inflate(R.layout.fragment_one, container, false);
Button button=view.findViewById(R.id.myButtonInFragment);
return view;
}
}
If you'd like to access this button from its parent activity, you can achieve it by making the button public:
public class OneFragment extends Fragment{
public Button button;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view=inflater.inflate(R.layout.fragment_one, container, false);
button=view.findViewById(R.id.myButtonInFragment);
return view;
}
}
and then, access it using the fragment's instance in your activity:
OneFragment myFragment=new OneFragment();
After you have attached the fragment to the activity, you can use:
myFragment.button.setClickEnabled(false);
However, accessing fragment's children outside of the fragment is not recommended, and you should avoid it if you can.
public class MainActivity extends AppCompatActivity {
Button button;
Fragment fragment;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
fragment = new Fragment();
View view = fragment.getView();
if (view !=null) {
view.findViewById(R.id.button);
}
}
}
I am developing an Android application. I have a requirement like there is a button in fragment 1, when a user clicks that button result should be displayed in fragment 2. While loading the activity both fragments is attached. Here is my try:
In main activity:
public void dsp(String str) {
secondfragment f2=new secondfragment();
Bundle bundle = new Bundle();
bundle.putString("edttext", "From Activity");
f2.setArguments(bundle);
}
In first fragment:
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v=inflater.inflate(R.layout.fragone, container,false);
Button btn = (Button) v.findViewById(R.id.button1);
btn.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v)
{
m.dsp("clicked");
}
});
return v;
}
In second fragment:
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v=inflater.inflate(R.layout.fragtwo, container,false);
tv= (TextView) v.findViewById(R.id.textView1);
tv.setText(this.getArguments().getString("name"));
return v;
}
When communicating from Fragment to Fragment you use an interface to pass data to the Activity which in turn updates the fragment you want to change.
For Example:
In Fragment 1:
public class FragmentOne extends Fragment{
public Callback mCallback;
public interface Callback{
void onUpdateFragmentTwo(String message);
}
#Override
public void onAttach(Activity activity){
super.onAttach(activity);
mCallback = (Callback) activity;
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v=inflater.inflate(R.layout.fragone, container,false);
Button btn = (Button) v.findViewById(R.id.button1);
btn.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
mCallback.onUpdateFragmentTwo("clicked");
}
});
return v;
}
}
then in main Activity implement the interface:
public class MainActivity extends AppCompatActivity implements Callback{
FragmentTwo fragmentTwo;
#Override
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// ... Load views or perform logic
// ... Load Fragment Two into your container
if(savedInstanceState == null){
fragmentTwo = FragmentTwo.newInstance(new Bundle()); // use real bundle here
getSupportFragmentManager()
.beginTransaction()
.add(R.id.fragment_holder, fragmentTwo, "Frag2").commit();
}
}
// Interface method
#Override
public void onUpdateFragmentTwo(String message){
// Call activity method with the argument
if(fragmentTwo != null){
fragmentTwo.updateFragmentTwo(message);
}
}
}
Update
In your second fragment I typically use a static newInstance(Bundle args) method to initialize and then would use a public method to communicate from the Activity to the Fragment for example:
public class FragmentTwo extends Fragment{
public static FragmentTwo newInstance(Bundle args){
FragmentTwo fragment = new FragmentTwo();
fragment.setArguments(args);
return fragment;
}
//... Class overrides here onCreateView etc..
// declare this method
public void updateFragmentTwo(String updateText){
// .. do something with update text
}
}
Thats it, happy coding!
Here you have what the Android Documentation says about Communicating Between Fragments. Here you'll have all the necessary steps to make two or more fragments communicate securely :)
I have been searching this but I haven't found anything that could help me.
I have a main activity with 2 fragments which I use as tabs in my toolbar. Is there any possibility of connecting an ImageButton from a fragment in my MainActivity to an other Activity. I know how to connect Activity to Activity through an imagebuttom, i just don't know how to do it from Fragment-> Activity. Thanks.
I have an image button on my fragment, and I want to open an activity when I press that ImageButton.
public class Movies extends Fragment {
public Movies() {
// Required empty public constructor
}
ImageButton imageButton2;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_movies, container, false);
imageButton2 = (ImageButton) findViewById(R.id.imageButton2);
imageButton2.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intentLoadNewActivity = new Intent(Movies.this, Activity_Civil_War.class);
startActivity(intentLoadNewActivity);
}
});
}
}
I am getting lots of errors. I also tried doing it in the MainActivity but I get the null object exception.
MainActivity Class:
public class MainActivity extends AppCompatActivity {
Toolbar toolbar;
TabLayout tabLayout;
ViewPager viewPager;
view_pager_adapter viewPagerAdapter;
ImageButton imageButton2;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
toolbar=(Toolbar)findViewById((R.id.toolBar));
tabLayout=(TabLayout)findViewById((R.id.tabLayout));
viewPager=(ViewPager)findViewById((R.id.ViewPager));
viewPagerAdapter = new view_pager_adapter(getSupportFragmentManager());
viewPagerAdapter.addFragments(new Showcase(),"Showcase");
viewPagerAdapter.addFragments(new Movies(),"Movie List");
viewPagerAdapter.addFragments(new Menu(),"Menu");
viewPagerAdapter.addFragments(new Login(),"Login");
viewPager.setAdapter(viewPagerAdapter);
tabLayout.setupWithViewPager(viewPager);
}
}
Few things first :
return inflater.inflate(R.layout.fragment_movies, container, false);
If your return a value here, the rest of the code below it will not be called. What you need to do is keep a reference to it and return it at the end of your method.
Then
Intent intentLoadNewActivity = new Intent(Movies.this, Activity_Civil_War.class);
I assume that Movies is a Fragment and Activity_Civil_War is an Activity (correct me if I'm wrong).
There is no constructor in the Intent class that takes a Fragment as a parameter. What you are trying to do by calling 'this' is to get a Context. In a Fragment you can do so by calling getActivity()
If we sum things up we get :
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_movies, container, false);
imageButton2 = (ImageButton) findViewById(R.id.imageButton2);
imageButton2.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intentLoadNewActivity = new Intent(getActivity(), Activity_Civil_War.class);
startActivity(intentLoadNewActivity);
}
});
return view;
}
I am working with Android Studio. I have a fragment on my Activty and I want to hide it when the user clicks on it.
For some reason I can´t just override a function for onclick like in the activties. And everytime I ask google all I can find are questions about how to
Implement onclick listeners for buttons or other elements in a fragment but that is not what I want. I want the onclick listener for the fragment itself.
Can anyone please tell me how to do that!?
You can do this by set ClickListener on the view inflating in a onCreateView of fragment like this :
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v=inflater.inflate(R.layout.layout_your, container, false);
v.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
//do your operation here
// this will be called whenever user click anywhere in Fragment
}
});
return v;
}
It goes like below
public class fragmentOne extends Fragment implements OnClickListener {
Button myButton;
#Override
public View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedinstanceState) {
View myView = inflater.inflate(R.layout.fragment_1, container, false);
myButton = (Button) myView.findViewById(R.id.myButton);
myButton.setOnClickListener(this);
return myView;
}
#Override
public void onClick(View v) {
// implements your things
}
}
I created an application with navigation drawer using this tutorial: http://www.androidhive.info/2013/11/android-sliding-menu-using-navigation-drawer/
And I have a button on the first fragment. So, I want to change fragment by clicking the button. This code can change fragment but not change navigation draver state (title, selected item):
public class FirstFragment extends Fragment {
public FirstFragment(){}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_today, container, false);
return rootView;
}
#Override
public void onActivityCreated(Bundle savedInstanceState) {
ImageButton addButton = (ImageButton) getView().findViewById(R.id.add_button);
addButton.setOnClickListener(new addNewListener());
super.onActivityCreated(savedInstanceState);
}
private class addNewListener implements View.OnClickListener {
#Override
public void onClick(View v) {
final FragmentTransaction ft = getFragmentManager().beginTransaction();
ft.replace(R.id.frame_container, new NewFragment(), "NewFragmentTag");
ft.commit();
}
}
}
How can I fix it?
Thanks a lot!