I used this link to create navigation drawer in my app. the question is :is there any way to create a basic activity witch have this drawer and extend other activity from this? i read this but all these links used DrawerLayout not Fragment Navigation Drawer and i can not use them. Is there any tutorial to solve my problem?
Here is what I do :
I create an abstrac class called RootActivity that extends Activity and which inflate the layout with the Drawer.
This class has an abstract method createPage in which you will inflate your activity layout.
Here is the basic code for the RootActivity :
public abstract class RootActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.yourRootlayout); //The root layout wich contain your Drawer
/**
* This FrameLayout is used has a container for your activity
* layout as you would do with a fragment container.
*/
FrameLayout container = (FrameLayout)findViewById(R.id.yourContainer);
View childActivityLayout = createPage(savedInstanceState);
if (childActivityLayout != null) {
container.addView(childActivityLayout);
}
}
public abstract View createPage(Bundle saveInstanceState);
}
And here is how you extend this root class :
public class ExampleActivity extends RootActivity {
#Override
public View createPage(Bundle saveInstanceState) {
View rootView = ...
//Inflate your layout
return rootView;
}
}
Related
I open this simple fragmentActivity without setting any contentView
public class InternalDummyActivity extends FragmentActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//
}
}
But I still see a blank view is opened. Why is that?
I have thought if there is no setContentView then the activity is transparent.
is it because of the fragmentActivity? How do I create a transparent fragmentActivity then?
Unlike typical android projects starting with MainActivity with all the code of the layout object in it. This architecture requires me to have the initial code in a custom object. Here's a structure for better understanding.
java/MainActivity.java
java/User.java
layout/activity_main.xml
layout/user.xml
Now I also need a reference to User object within MainActivity and it looks like this.
public class MainActivity extends AppCompatActivity {
public Users users; // instantiate custom class and show
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
}
My User class looks like this.
public class User extends AppCompatActivity {
ListView userList;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.user_list, container, false); // Inflate the layout for this fragment
userList = view.findViewById(R.id.userList);
return view;
}
}
layout/user.xml
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="org.puremvc.java.demos.android.employeeadmin.view.components.UserList">
<ListView
android:id="#+id/userList"
android:layout_width="395dp"
android:layout_height="715dp"
tools:layout_editor_absoluteX="8dp"
tools:layout_editor_absoluteY="8dp" />
</FrameLayout>
So, in other words, MainActivity just acts like a stage doing nothing except just providing a reference to the Initial object. Now I do need MainActivity to be there, can't point User to be a launcher in the manifest. Responsibilities are to be taken care of by User class.
Question: How to instantiate CustomClass User and show.
Context: The MainActivity class has to be minimalistic and clean, no User related code (ListView), all logic lies in the custom class.
P.S. There can be lateral approaches, as long as I have a reference to user Object in MainActivity and it's displayed on launch, I'll accept the answer.
As per my understanding: there should be two approaches.
First, by using the Fragment inside your Activity. Write all initialize and data flow codes inside the fragment and just initialize and start the fragment from the Activity. So when the Activity will start, it will give all its tasks to the fragment with its Context and rest thing Fragment will do.
Like below:
public class MainActivity extends AppCompatActivity {
public Users users; // instantiate custom class and show
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//the fragment stuff
FragmentManager fm= getFragmentManager() //or get SupportFragmentManager when the Fragment comes from Support lib
FragmentTransaction ft= fm.beginTransaction();
Fragment fragment= new UserListFragment();
ft.add(R.id.fragment_container, fragment);
ft.commit();
}
}
OR, the second approach should by using Interface and communicate both Activity and the Custom Class (or you can call it Controller) with it.
Its nothing, but a simple MVC design pattern which I never recommend.
You can write one Interface like below:
public interface IController{
public void initialize(Activity activity, Bundle savedInstanceState);
public void engage();
public void disengage();
}
Then, make an instance of this Controller inside your Activity/BaseActivity and use like below:
public MainActivity(IController controller){
this.controller = controller;
}
Then call each callback methods from their appropriate place to make them work inside the Controller.
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//give the priviledge of onCreate to initialize
controller.initialize(this, savedInstanceState);
}
Then in your Controller class, just write the same program which you supposed to write inside Activity:
public class Your_Controller implements IController {
#Override
public void initialize(Activity activity, Bundle savedInstanceState) {
//do super where needed
//make one class level Activity instance to work in other methods
act = activity;
//just initialize views like below
TextView tv = (TextView) activity.findViewById(R.id.abc);
}
How to Show activity element or view in it's fragment and also access from fragment without move from fragment to activity and also tell vice-versa of this scenario.
Here is My Problem:-
I am using Search Edit Box in Activity and I want to use this Search Box into my fragment but i don't want make any search box in fragment, I just want to show this Activity Search Box in Fragment When Ever User type in search box then by using textWatcher track the text and show the result of search box in fragment not in Activity.
Below is the image of UI that i want make it.
You can access activity elements and methods from fragment this way:
Activity template
public class ActivityMain extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_content)
}
public void updateView(){
// update your views & vars here
}
}
Fragment template
public class BlankFragment extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_blank, container, false);
}
}
public void updateActivityView(){
if (getActivity() != null){
((ActivityMain) getActivity()).updateView();
}
}
For vice versa you can access fragment items from activity this way:
ExampleFragment fragment = (ExampleFragment) getFragmentManager().findFragmentById(R.id.example_fragment);
fragment.specific_function_name();
Where R.id.example_fragment is most likely the FrameLayout id inside your xml layout
I have two fragments, fragment_one (fragmentOne.class) and fragment_two (fragmentTwo.class). These fragments are being displayed inside ActivityMain.class.
When fragment_one is being displayed I want to set Image A as the background for ActivityMain.class.
When fragment_two is being displayed I want to set Image B as the background for ActivityMain.class
I can swap and set the background of ActivityMain.class when I am not using fragments (i use buttons as a test)....But, when I modify this for fragments I cannot get it to work.
Listed here you will see my ActivityMain.class
public class ActivityMain extends FragmentActivity {
//set variables for use of pageradapter and swipe screen
MyPageAdapter adapter;
ViewPager pager;
Context context = this;
LinearLayout swipeHomeScreen;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.content_activity_nav);
//Implement the adapater for the swipe screen on launch page and circle indicator
adapter = new MyPageAdapter(getSupportFragmentManager());
pager = (ViewPager) findViewById(R.id.pager);
pager.setAdapter(adapter);
swipeHomeScreen = (LinearLayout) findViewById(R.id.swipeHomeScreen);
}
}
Here I have listed the code of one of my fragments where I am trying to share/pass the set the background image of ActivityMain.class...
public class ActivityNavSwipeTwo extends Fragment {
ActivityMain main;
public void onAttach(Activity activity) {
main = (ActivityMain) activity;
};
public static ActivityNavSwipeTwo newInstance() {
ActivityNavSwipeTwo fragment = new ActivityNavSwipeTwo();
return fragment;
}
public ActivityNavSwipeTwo() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View root = inflater.inflate(R.layout.fragment_two, null);
main.swipeHomeScreen.setBackgroundResource(R.drawable.Image2);
return root;
}
}
My activity inflates the fragments fine, but the background image does not change.
How could I implement this for target api 23??
Thanks for your support.
Implement viewpager.onpagechangedlistener in your activity. Then add view.setonpageselecterlistener(this) in oncreated method. You can control selected fragment in implemented on pageselected method
Definitely you have any parent layout(Relative/Linear) for your activity. So you have to do following:
Create id of parent layout if not created.
access from fragment and change the background color of that parent layout.
Write this in Fragment's onCreateView() method.
relativeLayout = (RelativeLayout)getActivity().findViewById(R.id.relativelayout);
relativeLayout.setBackground(background);
I am trying to implement navigation drawer with activities. I was followed this tutorial, but its not navigation other activities(xml) it's taking base activity xml only but I need to navigation their own xml activities.
public class Item1Activity extends BaseActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
/**
* We will not use setContentView in this activty
* Rather than we will use layout inflater to add view in FrameLayout of our base activity layout*/
/**
* Adding our layout to parent class frame layout.
*/
getLayoutInflater().inflate(R.layout. activity_main, frameLayout);
/**
* Setting title and itemChecked
*/
mDrawerList.setItemChecked(position, true);
setTitle(listArray[position]);
((ImageView)findViewById(R.id.image_view)).setBackgroundResource(R.drawable.image1);
}
}
It's only inflating base activity xml file.