如何不间断地显示我的导航栏内容？
我从头开始构建了一个可定制的导航抽屉(没有使用Android Studio提供的默认抽屉)。在我的天气应用程序的导航栏菜单https://i.stack.imgur.com/SIjdx.jpg中，每当我选择菜单上的一个选项(比如设置)时，它会显示选项的内容以及底部的导航视图和我的活动的工具栏内容，其中包括导航汉堡图标、编辑文本和搜索按钮(托管我的3个片段的活动)，这会破坏应用程序，使其看起来非常难看，即https://i.stack.imgur.com/gxj5n.jpg(从该屏幕截图看，如果实现良好，整个内容应该是空的)。其他栏菜单选项的情况相同。所有我想要的是一个空白的空间来工作，我想要的应用程序只显示导航栏内容，没有睡觉。示例；https://i.stack.imgur.com/3Jtga.png我应该怎么做？
导航菜单的视图由以下代码控制(在第185行)：
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
switch (item.getItemId()) {
case R.id.settings_id:
getSupportFragmentManager().beginTransaction().replace(R.id.fragment,
new Settings()).commit();
break;
case R.id.ads_upgrade_id:
getSupportFragmentManager().beginTransaction().replace(R.id.fragment,
new Upgrade()).commit();
break;
case R.id.privacy_policy_id:
getSupportFragmentManager().beginTransaction().replace(R.id.fragment,
new Privacy_Policy()).commit();
break;
}
drawer.closeDrawer(GravityCompat.START);
return true;
}
这是我的活动代码：
public class HomeActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener {
private DrawerLayout drawer;
// Last update time, click sound, search button, search panel.
TextView timeField;
MediaPlayer player;
ImageView Search;
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;
@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);
navigationView.setNavigationItemSelectedListener(this);
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);
// find the id's of specific variables.
BottomNavigationView bottomNavigationView = findViewById(R.id.bottomNavigationView);
// host 3 fragments along with bottom navigation.
final NavHostFragment navHostFragment = (NavHostFragment) getSupportFragmentManager().findFragmentById(R.id.fragment);
assert navHostFragment != null;
final NavController navController = navHostFragment.getNavController();
NavigationUI.setupWithNavController(bottomNavigationView, navController);
// Make hourly & daily tab unusable
bottomNavigationView.setOnNavigationItemSelectedListener(item -> {
if (getSupportFragmentManager().getBackStackEntryCount() > 0) {
getSupportFragmentManager().popBackStack();
}
return false;
});
navController.addOnDestinationChangedListener((controller, destination, arguments) -> navController.popBackStack(destination.getId(), 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 FirstFragment) {
FirstFragment firstFragment = (FirstFragment) currentFragment;
firstFragment.getWeatherData(textfield.getText().toString().trim());
} else if (currentFragment instanceof SecondFragment) {
SecondFragment secondFragment = (SecondFragment) currentFragment;
secondFragment.getWeatherData(textfield.getText().toString().trim());
} else if (currentFragment instanceof ThirdFragment) {
ThirdFragment thirdFragment = (ThirdFragment) currentFragment;
thirdFragment.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;
timeField.setVisibility(View.VISIBLE);
timeField.setText("First Updated:" + " " + response.body().getDt());
} catch (Exception e) {
timeField.setVisibility(View.GONE);
timeField.setText("First Updated: Unknown");
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 boolean onNavigationItemSelected(@NonNull MenuItem item) {
switch (item.getItemId()) {
case R.id.settings_id:
getSupportFragmentManager().beginTransaction().replace(R.id.fragment,
new Settings()).commit();
break;
case R.id.ads_upgrade_id:
getSupportFragmentManager().beginTransaction().replace(R.id.fragment,
new Upgrade()).commit();
break;
case R.id.privacy_policy_id:
getSupportFragmentManager().beginTransaction().replace(R.id.fragment,
new Privacy_Policy()).commit();
break;
}
drawer.closeDrawer(GravityCompat.START);
return true;
}
@Override
public void onBackPressed() {
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
} else {
super.onBackPressed();
// Open/close drawer animation
}
}
}
如果您需要任何其他代码来调查此问题，请让我知道。我只是想避免张贴太多
编辑：
我的旧底标签导航图：
<?xml version="1.0" encoding="utf-8"?>
<navigation xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/my_nav"
app:startDestination="@id/firstFragment">
<fragment
android:id="@+id/firstFragment"
android:name="com.viz.lightweatherforecast.FirstFragment"
android:label="fragment_first"
tools:layout="@layout/fragment_first" />
<fragment
android:id="@+id/secondFragment"
android:name="com.viz.lightpreciseweatherforecast.SecondFragment"
android:label="fragment_second"
tools:layout="@layout/fragment_second" />
<fragment
android:id="@+id/thirdFragment"
android:name="com.viz.lightpreciseweatherforecast.ThirdFragment"
android:label="fragment_third"
tools:layout="@layout/fragment_third" />
</navigation>
我的新导航条形图：
<?xml version="1.0" encoding="utf-8"?>
<navigation xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/bar_nav"
app:startDestination="@id/firstFragment">
<fragment
android:id="@+id/firstFragment"
android:name="com.viz.lightweatherforecast.FirstFragment"
android:label="fragment_first"
tools:layout="@layout/fragment_first" />
<fragment
android:id="@+id/settings_id"
android:name="com.viz.lightweatherforecast.Settings"
android:label="@string/settings"
tools:layout="@layout/settings" />
<fragment
android:id="@+id/ads_upgrade_id"
android:name="com.viz.lightweatherforecast.Upgrade"
android:label="@string/upgrade_to_remove_ads"
tools:layout="@layout/upgrade" />
<fragment
android:id="@+id/privacy_policy_id"
android:name="com.viz.lightweatherforecast.Privacy_Policy"
android:label="@string/privacy_policy"
tools:layout="@layout/privacy_policy"/>
</navigation>
解决方案
您使用的是导航体系结构组件，因此navController应该是控制片段事务的组件，您使用BottomNavigationView进行的操作是正确的。
但在navDrawer内，您正在通过supportFragmentManager执行事务，而应通过navController完成，因为两者处理导航的方式不同。
每当我在菜单上选择一个选项(比如设置)时，它都会显示该选项的内容以及底部导航视图
这是因为BottomNavView是活动的一部分，您需要将其移动到片段中；这需要更改应用程序的导航设计；为此，请如下所示更改应用程序导航：
主导航：
<navigation
..... >
<fragment
android:name="......HomeFragment"/>
<fragment
android:name="......SettingFragment"/>
<fragment
android:name="......AdsUpgradeFragment"/>
<fragment
android:name="......PrivacyPolicyFragment"/>
</navigation>
HomeFragment是应该保存BottomNaviagtionView而不是活动的片段；当您导航到SettingFragment时，navConroll将替换navHostFragment中的整个片段，因此BottomNaviagtionView将不会显示。
由导航汉堡组成的我的活动的工具栏内容 图标、编辑文本和搜索按钮(托管My 3的活动 碎片)，这会破坏应用程序，使其看起来非常难看
与BottomNaviagtionView不同，您不能对用作supportActionBar的工具栏执行此操作，因为为了更改其外观而多次设置supportActionBar将复制它；因此您必须接受单个工具栏；但是，您可以在目标更改时隐藏/显示包含搜索按钮和EditText的布局：
navController.addOnDestinationChangedListener((controller, destination, arguments) -> {
LinearLayout searchBar = findViewById(R.id.searchbar); // change searchbar according to the layout id that holds the search button and the EditText
if (destination.getId() == R.id.nav_home) {
searchBar.setVisibility(View.VISIBLE);
} else {
searchBar.setVisibility(View.GONE);
}
});
是的，他们当前在单击"上一步"时退出应用程序
要在任何时候按下任何片段中的底部后退按钮，请在这些片段的onCreateView()内使用OnBackPressedDispatcher()(在您的示例中为SettingFragment、PrivacyPolicyFragment和&；AdsUpgradeFragment)：
并确保appBarConfiguration没有引用这些片段，以便可以显示"向上"按钮而不是汉堡。
requireActivity().getOnBackPressedDispatcher().addCallback(getViewLifecycleOwner(), new OnBackPressedCallback(true) {
@Override
public void handleOnBackPressed() {
// Exit the app when back is pressed
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP)
requireActivity().finishAndRemoveTask();
else requireActivity().finish();
}
});
另外，请确保您的设置DrawerLayoutnavView在navController中设置为：
NavigationView navView = findViewById(....);
appBarConfiguration = new AppBarConfiguration.Builder(
R.id.nav_home) // remove up button from all these fragments >> Keep the up/back button in R.id.settings_id, R.id.settings_id, ads_upgrade_id, privacy_policy_id
.setOpenableLayout(drawer)
.build();
NavigationUI.setupActionBarWithNavController(this, navController, appBarConfiguration);
NavigationUI.setupWithNavController(navView, navController);
并在navDrawer中默认隐藏Home片段：
navView.getMenu().findItem(R.id.nav_home).setVisible(false); // adjust R.id.nav_home to yours
更新
我目前只有一个导航图。FirstFragment表示 今天，第二小时和第三小时 我正在使用的是我的其他天气选项卡，但您建议的那个 是在导航栏菜单上，我应该把你的换成我的，还是 是否为您的建议创建新建议？
您应该使用两个navGraphs，第一个是我建议的主导航；第二个是您已经使用的BottomNavigationView导航；这是因为我们将BottomNavigationView从活动布局转移到了主/主页片段布局；和it' recommended the BottomNavigationView should have a separate navGraph；
因此，您现在需要两个FragmentContainerView；第一个在引用此答案中提供的navGraph的活动布局中，第二个在引用BottomNavigationView的原始navGraph的主页片段布局中。
示例：
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