Override Back Button in Fragments
-
25-06-2021 - |
Question
I have to modify the back button commands for a couple of layouts from 5 fragments of an TabActivity. I tried this code for the main activity:
@Override
public void onTabChanged(String tabId) {
TabInfo newTab = mTabs.get(tabId);
if(mTabHost.getCurrentTab() == 0){
backpag=0;
}
if (mTabHost.getCurrentTab() == 1) {
backpag=1;
}
if (mTabHost.getCurrentTab() == 2) {
backpag=2;
}
if (mTabHost.getCurrentTab() == 3) {
backpag=3;
}
if (mTabHost.getCurrentTab() == 4) {
backpag=4;
}
if (mTabHost.getCurrentTab() == 5) {
backpag=5;
}
if (mLastTab != newTab) {
FragmentTransaction ft = mActivity.getSupportFragmentManager().beginTransaction();
if (mLastTab != null) {
if (mLastTab.fragment != null) {
ft.detach(mLastTab.fragment);
}
}
if (newTab != null) {
if (newTab.fragment == null) {
newTab.fragment = Fragment.instantiate(mActivity, newTab.clss.getName(), newTab.args);
ft.add(mContainerId, newTab.fragment, newTab.tag);
} else {
ft.attach(newTab.fragment);
}
}
mLastTab = newTab;
ft.commit();
mActivity.getSupportFragmentManager().executePendingTransactions();
}
}
}
@Override
public void onBackPressed() {
System.out.println("mtabhost" + mTabHost.getCurrentTab());
if (backpag == 1) {
VinocardFragment.onBackPressed();
} else if (backpag == 2) {
StandorteFragment.getInstance().onBackPressedStandorte();
} else if (backpag == 3) {
// StandorteFragment.onBackPressed();
} else if (backpag == 4) {
// StandorteFragment.onBackPressed();
} else if (backpag == 5) {
SonstigesFragment.onBackPressed();
} else if (backpag == 0) {
System.out.println("inainte d getinstance");
LoggedFragment.getInstance().onBackPressedLogged();
backpag=-1;
System.out.println("mtabhost" + backpag);
} else if(backpag==-1) {
System.out.println("mtabhost" + backpag);
finish();
}
}
But at a moment when i get to the first tab (backpag = 0) i press the back button and it starts a loop, as in i just press the back button and it goes to the first tab and the tab before it. In my logic after i press backbutton form the first tab it should exit (finish()). any ideeas why this happens?
Solution
Managed with this:
public void onBackPressed() {
// super.onBackPressed();
Log.d("debug", "tab back pressed :: " + backpag);
if (backpag == 0) {
SharedPreferences settings = getSharedPreferences("PrefFile", 0);
SharedPreferences.Editor editor = settings.edit();
editor.putBoolean("backfromtab", true);
editor.commit();
Intent back2main = new Intent(this, WeinCoMainActivity.class);
startActivity(back2main);
} else if (backpag == 1) {
VinocardFragment.getInstance().onBackPressedVinocard();
} else if (backpag == 2) {
StandorteFragment.getInstance().onBackPressedStandorte();
} else if (backpag == 3) {
// webshop
} else if (backpag == 4) {
// scanner
} else if (backpag == 5) {
SonstigesFragment.getInstance().onBackPressedSonstiges();
}
}
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