I have a new android project with a navigation drawer. Now i want to add a new base class and inherit it in the navigation drawer fragment class. But it already extends Fragment. So how do I inherit the base class in the navigation drawer fragment?
Multiple inheritance does not exit in Java. Essentially what you have to do is make the base class inherit from Fragment and then you can extend your navigation drawer Fragment from the base class.
public class BaseFragment extends Fragment {
...
}
public class NavigationDrawerFragment extends BaseFragment {
...
}
Related
How can I define a different Statusbar and Actionbar color for each fragment ?
At the moment.
How it should look.
First of all, I would highly recommend you to migrate to new approach - Toolbar. It is much more flexible and you can customize it as plain View.
About your question.
You can just get ActionBar object and setBackground programatically.
Here is short example
ActionBar bar = getActionBar();
bar.setBackgroundDrawable(new ColorDrawable("COLOR IN HEX 0xFFFF6666 for instance"));
I will show how would I implement this. This is more about architecture and patterns.
Use some base class for Fragment it would be better to have base class for Activity as well. Lets consider
public class BaseFragment extends Fragment
And you Activity class in which your fragment lives.
public class MainActivity extends Activity
And you have to define responsibilities of Activity in this case and create interfaces
In your case to work with ActionBar
Create interface
public interface ActionBarProvider {
void setActionBarColor(ColorDrawable color);
}
Make your activity implement this interface
public class MainActivity extends Activity implements ActionBarProvider {
public void setActionBarColo(ColorDrawable color) {
ActionBar bar = getActionBar();
bar.setBackgroundDrawable(color));
}
}
And finally in BaseFragment in onAttach
public void onAttach(Context context) {
super.onAttach(context);
mActionBarProvider = (ActionBarProvider) context;
}
Make mActionBarProvider variable protected and make each fragment extend BaseFragment and you can change action bar color from any fragment like this mActionBarProvider.setActionBarColor(new ColorDrawable());
Hope this helps.
I am trying to set up the action bar in an Activity which extends fragment:
public class ItemDescriptionActivity extends FragmentActivity
and this is the fragment:
public class ImageSliderFragment extends Fragment
How can I set it up, I cannot extend AppCompatActivity, thanks for your help
use AppCompatActivity . AppCompatActivity extends FragmentActivity so you can you fragments inside AppCompatActivity.
The class AppCompatActivity is a child class of FragmentActivity. so you can use AppCompatActivity instead of FragmentActivity.
I'm trying to call this function public void arrowClick()
is inside my main fragment public class CounterMain extends Fragment implements View.OnClickListener{
the fragment is extend android.support.v4.app.Fragment
I want to call this function from another Custmoe Dialog fragment
public class CustmoeDialog extends DialogFragment {
I tried ((CounterMain)getActivity()).arrowClick();
but I can't use it it says android.support.v4.app.Fragment cannot be cast to my.example.CounterMain
and the
CounterMain x = new CounterMain(); x.arrowClick();
it makes my app to stop working when I call it
any help?
You can call activity method by this way
((YourActivityClassName)getActivity()).yourPublicMethod();
and from activity you can directly call by this way
FragmentManager fm = getSupportFragmentManager();//if added by xml
YourFragmentClass fragment = (YourFragmentClass)fm.findFragmentById(R.id.your_fragment_id);
fragment.yourPublicMethod();
if you added fragment via code and used a tag string when you added your fragment, use findFragmentByTag instead:
YourFragmentClass fragment = (YourFragmentClass)fm.findFragmentByTag("yourTag");
First of all, you can not cast from ACTIVITY to FRAGMENT
But to cast from GLOBAL ACTIVITY to your ACTIVITY
Or create INTERFACE and implement it in ACTIVITY
Then cast it in FRAGMENT from ACTIVITY to INTERFACE
And on the question:
See here the right way how to implement
Basic communication between two fragments
Whats the efficient way to add Navigation Drawer on all the activities? I don't want to repeat the code for Navigation Drawer in all the activities and their layouts. Is it possible somehow to add Nav. Drawer in BaseActivity(custom class) and then every other activity will extend BaseActivity inorder to have the Navigation Drawer ?
Is it possible somehow to add Nav. Drawer in BaseActivity(custom class) and then every other activity will extend BaseActivity inorder to have the Navigation Drawer ?
Yes this is definitly the cleanest way to go.
public BaseActivity extends Activity {
#Override
protected void onCreate()
super.onCreate(); // calls Activity.onCreate()
// setup your Navigation Drawer
}
public FirstActivity extends BaseActivity {
#Override
protected void onCreate()
super.onCreate(); // will call the BaseActivitiy.onCreate()
// do something in the FirstActivity
}
public SecondActivity extends BaseActivity {
#Override
protected void onCreate()
super.onCreate(); // will call the BaseActivitiy.onCreate()
// do something in the SecondActivity
}
The "hard work" will be the layouts. Have one baseLayout for the BaseActivity with a place holder for the Content View (the visible part of the Activities). For all other Activitys use this layout and include your Content View.
I am using SherlockFragmentActivity with two fragments.
I want to call methods defined in the fragments from my SherlockFragmentActivity.
Fragment1 extends Fragment{
protected void resetSettings(){
//my code
}
}
and the activity
Main extends SherlockFragmentActivity{
//here i want to call resetSettings()
}