我有一个bottomnavigationview，其中包含5个片段，（考虑A（家庭），B，C，D，E）如果我去片段D，然后去活动（哪个在片段D或C或任何片段中） 5），然后按设备的后退按钮。它直接进入Home片段（A），实际上，它应该进入片段D或C。
我在上一个项目中使用过botomnavigationview，但是一切正常。
正在发生-MainActivity + HomeFragment（A）---> Fragment D->> Activity --- >> OnbackPressed --- >> HomeFragment
预期-MainActivity + HomeFragment（A）--->片段D->> Activity --- >> OnbackPressed --- >> D片段
感谢您的帮助。
片段D代码类似
public class AccountFragment extends Fragment {
public Button button;
private String TAG = AccountFragment.class.getSimpleName();
private TextView mContactustextView, mAddress, rateUs, aboutus, tvOrderHistory, userPhone, userEmail, buyerUserName, faqs;
public static AccountFragment newInstance() {
AccountFragment fragment = new AccountFragment();
return fragment;
}
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
setHasOptionsMenu(true);
Utils.matchColorOfStatusBar(getActivity());
View view = inflater.inflate(R.layout.accountfragment, container, false);
button = view.findViewById(R.id.login_button_account_page);
userPhone = view.findViewById(R.id.userPhone);
buyerUserName = view.findViewById(R.id.buyerUserName);
userEmail = view.findViewById(R.id.userEmail);
aboutus = view.findViewById(R.id.aboutus);
tvOrderHistory = view.findViewById(R.id.tvOrderHistory);
faqs = view.findViewById(R.id.faqs);
faqs.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(getActivity(), FAqsActivity.class);
startActivity(intent);
getActivity().overridePendingTransition(R.anim.fadein, R.anim.fadeout);
}
});
aboutus.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(getActivity(), AboutUsActivity.class);
startActivity(intent);
}
});
//Manage session here
if (App.getInstance().getPrefManager().isLoggedIn()) {
button.setText("Logout");
Log.e(TAG, "isWorking");
} else {
button.setText("Login");
userPhone.setText("");
userEmail.setText("");
buyerUserName.setText("");
Log.e(TAG, "isNotWorking");
}
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (App.getInstance().getPrefManager().isLoggedIn()) {
App.getInstance().getPrefManager().setLoginSession(false);
App.getInstance().getPrefManager().setCartCount(0);
App.getInstance().getPrefManager().setFavCount(0);
badgeCart();
badgeFav();
button.setText("Login");
userPhone.setText("");
userEmail.setText("");
buyerUserName.setText("");
Log.e(TAG, "ToLoginPage");
} else {
Intent intent = new Intent(getActivity(), LoginActivity.class);
startActivity(intent);
getActivity().overridePendingTransition(R.anim.fadein, R.anim.fadeout);
Log.e(TAG, "log");
}
}
});
//findview by id
rateUs = view.findViewById(R.id.rateus);
mAddress = view.findViewById(R.id.tv_address);
mContactustextView = view.findViewById(R.id.tv_contact_us);
rateUs.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse("market://details?id=com.test.android"));
startActivity(intent);
}
});
mAddress.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (App.getInstance().getPrefManager().isLoggedIn()) {
startActivity(new Intent(getActivity(), AddressActivity.class).putExtra("source", AccountFragment.class.getSimpleName()));
getActivity().overridePendingTransition(R.anim.fadein, R.anim.fadeout);
} else {
Utils.showAlert(getContext(), getString(R.string.please_login));
}
}
});
tvOrderHistory.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (App.getInstance().getPrefManager().isLoggedIn()) {
startActivity(new Intent(getActivity(), MyOrdersListActivity.class));
getActivity().overridePendingTransition(R.anim.fadein, R.anim.fadeout);
} else {
Utils.showAlert(getContext(), getString(R.string.please_login));
}
}
});
活动代码是这样的
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Utils.matchColorOfStatusBar(this);
setContentView(R.layout.activity_contact_us);
//FindViewByIds
contact_via_call = findViewById(R.id.ll_call_custmr_care);
rootLinearLayout = findViewById(R.id.ll_contact_us);
contact_via_email = findViewById(R.id.ll_email_custmr_care);
ll_whatsapp = findViewById(R.id.ll_whatsapp);
contact_via_email.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent i = new Intent(Intent.ACTION_SENDTO);
i.setData(Uri.parse("mailto:"));
i.putExtra(Intent.EXTRA_EMAIL, "");
i.putExtra(Intent.EXTRA_SUBJECT, "subject will be here");
i.putExtra(Intent.EXTRA_EMAIL, new String[]{getString(R.string.supportemail)});
try {
ContactUsActivity.this.startActivity(Intent.createChooser(i, "Send mail..."));
} catch (android.content.ActivityNotFoundException ex) {
Utils.showSnakbarTypeOne(rootLinearLayout, "No email client installed");
//showAlertMessage(context, "There are no email clients installed.");
}
}
});
ll_whatsapp.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
openWhatsApp();
}
});
contact_via_call.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String phone = getString(R.string.custmersupportnum);
Intent intent = new Intent(Intent.ACTION_DIAL, Uri.fromParts("tel", phone, null));
startActivity(intent);
}
});
//setuptoolbar
toolbar = (Toolbar) findViewById(R.id.toolbar_contact_us);
toolbar.setTitle("Contact Us");
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setDisplayShowHomeEnabled(true);
toolbar.setTitleTextColor(getResources().getColor(R.color.white));
toolbar.setNavigationOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
onBackPressed();
}
});
}
@Override
public void onBackPressed() {
super.onBackPressed();
finish();
}
}
主要活动就是这样
private BottomNavigationView.OnNavigationItemSelectedListener mOnNavigationItemSelectedListener = new BottomNavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
switch (item.getItemId()) {
case R.id.home:
fragment = HomeFragment.newInstance();
break;
case R.id.favorite:
if (App.getInstance().getPrefManager().isLoggedIn())
fragment = FavoriteFragment.newInstance();
else {
Utils.showAlert(MainActivity.this, getString(R.string.please_login));
}
break;
case R.id.categories:
fragment = CategoriesFragment.newInstance();
break;
case R.id.carts:
if (App.getInstance().getPrefManager().isLoggedIn())
fragment = CartFragment.newInstance();
else {
Utils.showAlert(MainActivity.this, getString(R.string.please_login));
}
break;
case R.id.accounts:
fragment = AccountFragment.newInstance();
break;
}
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
transaction.setCustomAnimations(R.anim.fadein, R.anim.fadeout);
transaction.replace(R.id.home_container, fragment);
transaction.commit();
return true;
}
};
@Override
protected void attachBaseContext(Context newBase) {
super.attachBaseContext(CalligraphyContextWrapper.wrap(newBase));
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
private void cartBadgeCount(){
BottomNavigationView mBottomNavigationView = (BottomNavigationView) findViewById(R.id.bottom_navigation);
mBottomNavigationView.setOnNavigationItemSelectedListener(mOnNavigationItemSelectedListener);
BottomNavigationViewHelper.disableShiftMode(mBottomNavigationView);
BottomNavigationMenuView bottomNavigationMenuView =
(BottomNavigationMenuView) mBottomNavigationView.getChildAt(0);
View v = bottomNavigationMenuView.getChildAt(2);
BottomNavigationItemView itemView = (BottomNavigationItemView) v;
View badge = LayoutInflater.from(this)
.inflate(R.layout.notification_badge, bottomNavigationMenuView, false);
tvCartCount = badge.findViewById(R.id.notification_badge);
itemView.addView(badge);
mBottomNavigationView.setSelectedItemId(R.id.home);
if (Validation.isValidString(getIntent().getStringExtra(Constant.GO_TO_CART)) && getIntent().getStringExtra(Constant.GO_TO_CART).equalsIgnoreCase(Constant.GO_TO_CART)) {
// getSupportFragmentManager().beginTransaction().replace(R.id.home_container, new CartFragment()).commit();
// bottomNavigationMenuView.getSelectedItemId().setSelected(true);
View view = bottomNavigationMenuView.findViewById(R.id.carts);
view.performClick();
}
}
private void favCountBadge() {
BottomNavigationView mBottomNavigationView = (BottomNavigationView) findViewById(R.id.bottom_navigation);
mBottomNavigationView.setOnNavigationItemSelectedListener(mOnNavigationItemSelectedListener);
BottomNavigationViewHelper.disableShiftMode(mBottomNavigationView);
BottomNavigationMenuView bottomNavigationMenuView =
(BottomNavigationMenuView) mBottomNavigationView.getChildAt(0);
View v = bottomNavigationMenuView.getChildAt(3);
BottomNavigationItemView itemView = (BottomNavigationItemView) v;
View badge = LayoutInflater.from(this)
.inflate(R.layout.notification_badge, bottomNavigationMenuView, false);
tvFav = badge.findViewById(R.id.notification_badge);
itemView.addView(badge);
}
@Override
protected void onResume() {
super.onResume();
cartBadgeCount();
favCountBadge();
if (App.getInstance().getPrefManager().getCartCount() > 0) {
tvCartCount.setVisibility(View.VISIBLE);
tvCartCount.setText(String.valueOf(App.getInstance().getPrefManager().getCartCount()));
} else
tvCartCount.setVisibility(View.GONE);
if (App.getInstance().getPrefManager().getFavCount() > 0) {
tvFav.setVisibility(View.VISIBLE);
tvFav.setText(String.valueOf(App.getInstance().getPrefManager().getFavCount()));
} else
tvFav.setVisibility(View.GONE);
Log.e(TAG, "cart count " +
String.valueOf(App.getInstance().getPrefManager().getCartCount()));
Log.e(TAG, "fav count " +
String.valueOf(App.getInstance().getPrefManager().getFavCount()));
}
@Override
public void onBackPressed() {
new AlertDialog.Builder(this)
.setIcon(android.R.drawable.ic_dialog_alert)
.setTitle("Confirmation")
.setMessage("Are you sure you want to Exit?")
.setPositiveButton("Yes", new
DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which)
{
finishAffinity();
}
})
.setNegativeButton("No", null)
.show();
}`enter code here`
答案 0 :(得分：1)
注意，请使用！在回答中说，添加片段代替
好吧，我不是这是做自己喜欢的事情的最好方法！但它仍然可以帮助您。在您的mainActivity中，您的底部导航位置是！有全局声明和初始化！并在onResume方法中执行类似的操作！ 您可以使用清空或检查碎片堆！
if (getSupportFragmentManager().getBackStackEntryCount() > 0 ){
getFragmentManager().popBackStack();
} else {
super.onBackPressed();
}
在您的onResume中做类似的事情！在底部导航的getItem中传递所需的项目编号（#position）！
@Override
protected void onResume() {
super.onResume();
// here you can check the stack that last fragment in stack is the one that
//opened the 2nd activity then you can use its fragment to be loaded in
//transaction and also highlight the the bottomnav's tab
bottomNavigationView.getMenu().getItem(0).setChecked(true);
}
答案 1 :(得分：0)
使用以下代码替换代码：
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
transaction.setCustomAnimations(R.anim.fadein, R.anim.fadeout);
transaction.replace(R.id.home_container, fragment);
transaction.addToBackStack(fragmentName)
transaction.commit();