I am working on an E-com module.I have implemented two fragments in an activity.One(HomeFragment) is loading within the activity in container and another(CartFragment) is loading onClick of Cart icon placed on toolbar. Now everytime when i am clicking on cart icon same fragment is loading again and again, which is fine i want it in a same way.But now i want no matter how many times i load the same fragment but on pressing back button it should go on home screen.Right now when i am pressing back key it is returning all the loaded fragments.How should i solve this. Please Help.
CODE IN CONTEXT:
MainActivity
public class MainActivity extends AppCompatActivity implements HomeFragment.OnAdd,HomeFragment.OnDel,FragmentManager.OnBackStackChangedListener{
private int count = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
HomeFragment blank = new HomeFragment();
fragmentTransaction.add(R.id.frame, blank);
fragmentTransaction.commit();
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setDisplayShowHomeEnabled(true);
getSupportActionBar().setDisplayShowTitleEnabled(false);
}
@Override
public void onBackPressed() {
if (getFragmentManager().getBackStackEntryCount() > 0 ){
getFragmentManager().popBackStack();
} else {
super.onBackPressed();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_main, menu);
//----------------CART ICON---------------------//
MenuItem item1=menu.findItem(R.id.cart);
item1.setIcon(buildCounterDrawable(count, R.mipmap.cart));
//----------------SPINNER ICON------------------//
MenuItem item = menu.findItem(R.id.spinner);
Spinner spinner = (Spinner) MenuItemCompat.getActionView(item);
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this,
R.array.spinner_list_item_array, android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_list_item_activated_1);
spinner.setAdapter(adapter);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.cart) {
CartFragment myDetailFragment = new CartFragment();
Bundle bundle = new Bundle();
myDetailFragment.setArguments(bundle);
FragmentTransaction fragmentTransaction =
getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.activity_main, myDetailFragment);
fragmentTransaction.addToBackStack(null);
fragmentTransaction.commit();
return true;
}
return super.onOptionsItemSelected(item);
}
//---------------------------INFLATING BADGE------------------------------//
private Drawable buildCounterDrawable(int count, int backgroundImageId) {
LayoutInflater inflater = LayoutInflater.from(this);
View view = inflater.inflate(R.layout.counter_menuitem_layout, null);
view.setBackgroundResource(backgroundImageId);
if (count == 0) {
View counterTextPanel = view.findViewById(R.id.counterValuePanel);
counterTextPanel.setVisibility(View.GONE);
} else {
TextView textView = (TextView) view.findViewById(R.id.count);
textView.setText("" + count);
}
view.measure(
View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED),
View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));
view.layout(0, 0, view.getMeasuredWidth(), view.getMeasuredHeight());
view.setDrawingCacheEnabled(true);
view.setDrawingCacheQuality(View.DRAWING_CACHE_QUALITY_HIGH);
Bitmap bitmap = Bitmap.createBitmap(view.getDrawingCache());
view.setDrawingCacheEnabled(false);
return new BitmapDrawable(getResources(), bitmap);
}
@Override
public void onActionPerformedAdd(int count1) {
count++;
invalidateOptionsMenu();
}
@Override
public void onActionPerformedDel(int count1) {
if (count>0){
count--;
invalidateOptionsMenu();
}
}
@Override
public void onBackStackChanged() {
}
}
HomeFragment
public class HomeFragment extends Fragment {
public HomeFragment() {
// Required empty public constructor
}
private Button add,del;
private int count = 0;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view= inflater.inflate(R.layout.fragment_home, container, false);
add=(Button)view.findViewById(R.id.add);
del=(Button)view.findViewById(R.id.minus);
add.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
((OnAdd)getActivity()).onActionPerformedAdd(count);
}
});
del.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
((OnDel)getActivity()).onActionPerformedDel(count);
}
});
return view;
}
public interface OnAdd{
void onActionPerformedAdd(int count);
}
public interface OnDel{
void onActionPerformedDel(int count);
}
}
CartFragment
public class CartFragment extends Fragment {
public CartFragment() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view= inflater.inflate(R.layout.fragment_cart, container, false);
Toolbar toolbar = (Toolbar) view.findViewById(R.id.toolbar);
((AppCompatActivity)getActivity()).setSupportActionBar(toolbar);
((AppCompatActivity)getActivity()).getSupportActionBar().setDisplayHomeAsUpEnabled(true);
((AppCompatActivity)getActivity()).getSupportActionBar().setDisplayShowHomeEnabled(true);
((AppCompatActivity)getActivity()).getSupportActionBar().setDisplayShowTitleEnabled(false);
return view;
}
}
