[英]How to navigate back to activity from navigation drawer tabs?
我有一個帶有 3 個主要選項卡的導航抽屜https://i.stack.imgur.com/SIjdx.jpg 。 在這些選項卡中的每一個中,即設置和 rest,我已經實現了一個頂部后退按鈕,單擊該按鈕返回主活動。 我也嘗試過處理底部后退按鈕,但現在的問題是,如果我單擊底部后退按鈕(手機手勢導航) https://i.stack.imgur.com/RYW16.jpg ,它只會退出應用程序而不是按預期返回主 Activity。
我想讓它返回到家庭活動,這樣我就可以使用頂部和底部的后退按鈕瀏覽選項卡,請問我該怎么做才能糾正這個問題?
我在這個網站上檢查了類似的問題,但還沒有找到解決方案。
這是我的設置代碼(我對其他選項卡也使用相同的代碼):
public class Settings extends Fragment {
@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.settings, container, false);
requireActivity().getOnBackPressedDispatcher().addCallback(getViewLifecycleOwner(), new OnBackPressedCallback(true) {
@Override
public void handleOnBackPressed() {
requireActivity().finish();
}
});
return view;
}
}
編輯:
家庭活動:
public class HomeActivity extends AppCompatActivity {
private DrawerLayout drawer;
// Last update time, click sound, search button, search panel.
TextView timeField;
MediaPlayer player;
ImageView Search;
ConstraintLayout searchbar;
EditText textfield;
// For scheduling background image change(using constraint layout, start counting from dubai, down to statue of liberty.
ConstraintLayout constraintLayout;
public static int count = 0;
int[] drawable = new int[]{R.drawable.dubai, R.drawable.norway, R.drawable.eiffel_tower, R.drawable.hong_kong, R.drawable.statue_of_liberty,
R.drawable.beijing, R.drawable.chicago, R.drawable.colombia, R.drawable.vienna, R.drawable.tokyo};
Timer _t;
private WeatherDataViewModel viewModel;
private AppBarConfiguration appBarConfiguration;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
// use home activity layout.
Toolbar toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
// Allow activity to make use of the toolbar
drawer = findViewById(R.id.drawer_layout);
NavigationView navigationView = findViewById(R.id.nav_view);
// host 3 fragments along with bottom navigation.
final NavHostFragment navHostFragment = (NavHostFragment) getSupportFragmentManager().findFragmentById(R.id.fragment);
assert navHostFragment != null;
final NavController navController = navHostFragment.getNavController();
// Passing each menu ID as a set of Ids because each
// menu should be considered as top level destinations.
// remove up button from all these fragments
appBarConfiguration = new AppBarConfiguration.Builder(
R.id.main_id) // remove up button from all these fragments >> Keep up button in R.id.nav_setting, R.id.nav_slideshow
.setOpenableLayout(drawer)
.build();
// Hiding default Drawer fragment that has the BottomNavView
navigationView.getMenu().findItem(R.id.main_id).setVisible(false);
viewModel = new ViewModelProvider(this).get(WeatherDataViewModel.class);
// Trigger action to open & close navigation drawer
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(this, drawer, toolbar
, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.addDrawerListener(toggle);
toggle.syncState();
timeField = findViewById(R.id.textView9);
Search = findViewById(R.id.imageView4);
textfield = findViewById(R.id.textfield);
searchbar = findViewById(R.id.searchbar);
// find the id's of specific variables.
NavigationUI.setupActionBarWithNavController(this, navController, appBarConfiguration);
NavigationUI.setupWithNavController(navigationView, navController);
toggle.setToolbarNavigationClickListener(v -> {
// Enable the functionality of opening the side drawer, when the burger icon is clicked
toggle.setDrawerIndicatorEnabled(true);
navController.navigate(R.id.main_id);
});
navController.addOnDestinationChangedListener((controller, destination, arguments) -> {
// Hide/show top search bar
if (destination.getId() == R.id.main_id) {
searchbar.setVisibility(View.VISIBLE);
toggle.setHomeAsUpIndicator(R.drawable.ic_baseline_arrow_back_24);
} else {
searchbar.setVisibility(View.GONE);
}
// Fragments that you want to show the back button
if (destination.getId() == R.id.settings_id || destination.getId() == R.id.ads_upgrade_id || destination.getId() == R.id.privacy_policy_id) {
// Disable the functionality of opening the side drawer, when the burger icon is clicked
toggle.setDrawerIndicatorEnabled(false);
}
});
// For scheduling background image change
constraintLayout = findViewById(R.id.layout);
constraintLayout.setBackgroundResource(R.drawable.dubai);
_t = new Timer();
_t.scheduleAtFixedRate(new TimerTask() {
@Override
public void run() {
// run on ui thread
runOnUiThread(() -> {
if (count < drawable.length) {
constraintLayout.setBackgroundResource(drawable[count]);
count = (count + 1) % drawable.length;
}
});
}
}, 5000, 5000);
Search.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// make click sound when search button is clicked.
player = MediaPlayer.create(HomeActivity.this, R.raw.click);
player.start();
getWeatherData(textfield.getText().toString().trim());
// make use of some fragment's data
Fragment currentFragment = navHostFragment.getChildFragmentManager().getFragments().get(0);
if (currentFragment instanceof MainFragment) {
((MainFragment) currentFragment).getWeatherData(textfield.getText().toString().trim());
}
}
private void getWeatherData(String name) {
ApiInterface apiInterface = ApiClient.getClient().create(ApiInterface.class);
Call<Example> call = apiInterface.getWeatherData(name);
call.enqueue(new Callback<Example>() {
@Override
public void onResponse(@NonNull Call<Example> call, @NonNull Response<Example> response) {
try {
assert response.body() != null;
} catch (Exception e) {
Log.e("TAG", "No City found");
Toast.makeText(HomeActivity.this, "No City found", Toast.LENGTH_SHORT).show();
}
}
@Override
public void onFailure(@NotNull Call<Example> call, @NotNull Throwable t) {
t.printStackTrace();
}
});
}
});
}
@Override
public void onBackPressed() {
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
} else {
super.onBackPressed();
// Open/close drawer animation
}
}
@Override
protected void onPause() {
super.onPause();
if (viewModel.getMediaPlayer() != null)
viewModel.getMediaPlayer().pause();
}
@Override
protected void onResume() {
super.onResume();
if (viewModel.getMediaPlayer() != null) {
viewModel.getMediaPlayer().start();
viewModel.getMediaPlayer().setLooping(true);
}
}
@Override
public boolean onSupportNavigateUp() {
final NavHostFragment navHostFragment = (NavHostFragment) getSupportFragmentManager().findFragmentById(R.id.fragment);
assert navHostFragment != null;
final NavController navController = navHostFragment.getNavController();
// return NavigationUI.navigateUp(navController,drawer);
return NavigationUI.navigateUp(navController, appBarConfiguration)
|| super.onSupportNavigateUp(); // navigateUp tries to pop the backstack
}
}
使用onBackPressed()
function 覆蓋后退按鈕的操作。 這是一些示例代碼:
override fun onBackPressed() {
val intent = Intent(this, HomeActivtiy::class.java)
startActivity(intent)
}
在onBackPressed()
function 中編寫您想要的操作。
為了在單擊底部后退按鈕時返回活動而不是現有應用程序:
從所有相關片段(如 SettingFragment)中刪除以下回調:
requireActivity().getOnBackPressedDispatcher().addCallback(getViewLifecycleOwner(), new OnBackPressedCallback(true) {
@Override
public void handleOnBackPressed() {
requireActivity().finish();
}
});
導航組件已經處理了后台堆棧,所以不用擔心。 當您回到家庭活動時,會出現一個小問題; 你會看到向上按鈕而不是漢堡圖標; 要解決此問題,您需要在返回addOnDestinationChangedListener
時添加toggle.setDrawerIndicatorEnabled(true)
所以,在HomeActivity
:
navController.addOnDestinationChangedListener((controller, destination, arguments) -> {
// Hide/show top search bar
if (destination.getId() == R.id.main_id) {
searchbar.setVisibility(View.VISIBLE);
toggle.setHomeAsUpIndicator(R.drawable.ic_baseline_arrow_back_24);
toggle.setDrawerIndicatorEnabled(true); // <<< Add this line of code to enable the burger icon
} else {
searchbar.setVisibility(View.GONE);
}
// Fragments that you want to show the back button
if (destination.getId() == R.id.settings_id || destination.getId() == R.id.ads_upgrade_id || destination.getId() == R.id.privacy_policy_id) {
// Disable the functionality of opening the side drawer, when the burger icon is clicked
toggle.setDrawerIndicatorEnabled(false);
}
});
由於您沒有創建全新的活動,因此聲音應繼續播放。
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