动态地想从管理端更新编辑文本中的文本，并且应该在用户端反映更新的文本
Dynamically want to update the text in edit Text from admin end and should reflect updated text in user end
我为我的一个项目创建了 3 个片段..这是其中之一。所以基本上我想要当管理员（aAccountFragment）点击更新报价按钮时，报价应该更新并且应该反映在用户端的 AccountFragment.xml 文件中。
为此，在管理员（aAccountFragment）方面，我提供并编辑了文本，管理员可以在其中每隔 24hrs.and 在用户端（AccountFragment）更新报价，用户只能在任何时候看到更新的报价管理员将更新报价，因为在用户端提供了 textview，在管理端提供了 EditText。
为此，我附上了我的 aAccountFragment.xml、AccountFragment.xml、AccountFragment.java、aAccountFragment.java 代码。
这是我的AccountFragment.xml代码
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".aAccountFragment"
android:background="@drawable/ic_launcher_background">
<!-- TODO: Update blank fragment layout -->
<TextView
android:layout_width="339dp"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_alignParentBottom="true"
android:layout_marginEnd="41dp"
android:layout_marginBottom="465dp"
android:text=" QUOTE OF THE DAY"
android:textColor="@color/black"
android:textSize="30sp" />
<EditText
android:layout_width="323dp"
android:layout_height="111dp"
android:layout_alignParentEnd="true"
android:layout_alignParentBottom="true"
android:layout_marginEnd="21dp"
android:layout_marginBottom="273dp"
android:text="-She decided to start living the life she imagined-"
android:textColor="@color/DarkRed"
android:textSize="25sp" />
<Button
android:layout_width="166dp"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_alignParentBottom="true"
android:layout_marginEnd="107dp"
android:layout_marginBottom="177dp"
android:background="@color/LightBlue"
android:text="UPDATE QUOTE"
android:textColor="@color/black"
android:textSize="20sp" />
<Button
android:id="@+id/logout1"
android:layout_width="166dp"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_alignParentBottom="true"
android:layout_marginEnd="43dp"
android:layout_marginBottom="75dp"
android:background="@color/Pink"
android:text="LOG OUT"
android:textColor="@color/black"
android:textSize="20sp" />
</RelativeLayout>
这是我的AccountFragment.java代码。
public class aAccountFragment extends Fragment {
Button logout1;
public aAccountFragment() {
// 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.afragment_account, container, false);
logout1 = view.findViewById(R.id.logout1);
logout1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
startActivity(new Intent(getActivity(), aloginpage.class));
Toast.makeText(getActivity().getApplicationContext(), "SUCCESSFULLY LOGOUT", Toast.LENGTH_SHORT).show();
}
});
return view;
}
}
这是我的 AccountFragment.xml 代码。
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".AccountFragment"
android:background="@drawable/ic_launcher_background">
<!-- TODO: Update blank fragment layout -->
<TextView
android:layout_width="339dp"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_alignParentBottom="true"
android:layout_marginEnd="41dp"
android:layout_marginBottom="465dp"
android:text=" QUOTE OF THE DAY"
android:textColor="@color/black"
android:textSize="30sp" />
<TextView
android:layout_width="296dp"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_alignParentBottom="true"
android:layout_marginEnd="49dp"
android:layout_marginBottom="272dp"
android:text="-She decided to start living
the life she imagined-"
android:textColor="@color/DarkRed"
android:textSize="25sp" />
<Button
android:id="@+id/logout"
android:layout_width="166dp"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_alignParentBottom="true"
android:layout_marginEnd="28dp"
android:layout_marginBottom="75dp"
android:background="@color/Pink"
android:text="LOG OUT"
android:textColor="@color/black"
android:textSize="20sp" />
</RelativeLayout>
这是我的 AccountFragment.java 代码。
public class AccountFragment extends Fragment {
Button logout;
public AccountFragment() {
// 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_account, container, false);
logout = view.findViewById(R.id.logout);
logout.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
startActivity(new Intent(getActivity(), loginpage.class));
Toast.makeText(getActivity().getApplicationContext(), "SUCCESSFULLY LOGOUT", Toast.LENGTH_SHORT).show();
}
});
return view;
}
}
第 1 步： 从 AdminFragment.java 中获取来自 edittext 的报价输入。我没有发布它的 xml 文件，因为除了 EditText 之外没有什么重要的。你可以把它放在任何 Activity.
里面
AdminFragment.java
public class AdminFragment extends Fragment {
public static AdminFragment newInstance() {
return new AdminFragment();
}
@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container,
@Nullable Bundle savedInstanceState) {
return inflater.inflate(R.layout.main_fragment, container, false);
}
@Override
public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState){
EditText quoteEditText = view.findViewById(R.id.quote_et);
Button quoteBtn = view.findViewById(R.id.quote_btn);
quoteBtn.setOnClickListener(v -> {
String quote = quoteEditText.getText().toString();
if (quote.isEmpty()){
Toast.makeText(getContext(),"Please Enter Quote!",Toast.LENGTH_SHORT).show();
}else {
Intent intent = new Intent(getActivity(), BottomNavigationActivity.class);
intent.putExtra("quote",quote);
startActivity(intent);
}
});
}
@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
}
}
第 2 步：
正如您声明的 BottomNavigationActivity 那样，它有 3 个片段，即 SnapFragment.java、HomeFragment.java 和 AccountFragment.java。单击 BottomNavigationActivity 内的 updateQuote 按钮时，将从 AdminFragment.java 接收报价文本。在 BottomNavigationActivity 中收到 quote 后，我将打开第 3 个片段，即 AccountFragment 以显示引用的文本。
BottomNavigationActivity.java
public class BottomNavigationActivity extends AppCompatActivity {
String updatedQuote = "";
BottomNavigationViewModel bottomNavigationViewModel;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_bottom_navigation);
bottomNavigationViewModel = new ViewModelProvider(this).get(BottomNavigationViewModel.class);
BottomNavigationView navView = findViewById(R.id.nav_view);
// Passing each menu ID as a set of Ids because each
// menu should be considered as top level destinations.
AppBarConfiguration appBarConfiguration = new AppBarConfiguration.Builder(
R.id.navigation_snap, R.id.navigation_home, R.id.navigation_account)
.build();
NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment);
NavigationUI.setupActionBarWithNavController(this, navController, appBarConfiguration);
NavigationUI.setupWithNavController(navView, navController);
updatedQuote = getIntent().getStringExtra("quote");
Log.d("tisha==>>","Quote = "+updatedQuote);
bottomNavigationViewModel.setQuoteLiveData(updatedQuote);
// Below I am selecting 3rd Fragment to show Quote
navView.setSelectedItemId(R.id.navigation_account);
}
}
activity_bottom_navigation.xml
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingTop="?attr/actionBarSize">
<com.google.android.material.bottomnavigation.BottomNavigationView
android:id="@+id/nav_view"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="0dp"
android:layout_marginEnd="0dp"
android:background="?android:attr/windowBackground"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:menu="@menu/bottom_nav_menu" />
<fragment
android:id="@+id/nav_host_fragment"
android:name="androidx.navigation.fragment.NavHostFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:defaultNavHost="true"
app:layout_constraintBottom_toTopOf="@id/nav_view"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:navGraph="@navigation/mobile_navigation" />
</androidx.constraintlayout.widget.ConstraintLayout>
我在这里使用 ViewModel，因为将 quote 数据从当前 activity 传递到 AccountFragment.java 会更容易，因为 AccountFragment 未实例化通过它的构造函数。 BottomNavigationViewModel 负责存储 quote 并在需要的地方提供。
BottomNavigationViewModel.java
public class BottomNavigationViewModel extends ViewModel {
private final MutableLiveData<String> quoteLiveData;
public String getQuoteLiveData(){
return quoteLiveData.getValue();
}
public void setQuoteLiveData(String quote){
quoteLiveData.setValue(quote);
}
public BottomNavigationViewModel(){
quoteLiveData = new MutableLiveData<>();
}
}
第 3 步：
现在在 AccountFragment 中，我只得到在 BottomNavigationActivity 中创建的 view model 并从中收集 quote 并将其显示在 TextView.
中
AccountFragment.java
public class AccountFragment extends Fragment {
private String mQuote;
private BottomNavigationViewModel bottomNavigationViewModel;
public AccountFragment() {
// Required empty public constructor
}
public static AccountFragment newInstance(String quote) {
return new AccountFragment();
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
bottomNavigationViewModel = new ViewModelProvider(requireActivity()).get(BottomNavigationViewModel.class);
mQuote = bottomNavigationViewModel.getQuoteLiveData();
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_account, container, false);
}
@Override
public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState){
TextView quoteView = view.findViewById(R.id.quote_tv);
quoteView.setText(mQuote);
}
}
为此，在管理员（aAccountFragment）方面，我提供并编辑了文本，管理员可以在其中每隔 24hrs.and 在用户端（AccountFragment）更新报价，用户只能在任何时候看到更新的报价管理员将更新报价，因为在用户端提供了 textview，在管理端提供了 EditText。
为此，我附上了我的 aAccountFragment.xml、AccountFragment.xml、AccountFragment.java、aAccountFragment.java 代码。
这是我的AccountFragment.xml代码
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".aAccountFragment"
android:background="@drawable/ic_launcher_background">
<!-- TODO: Update blank fragment layout -->
<TextView
android:layout_width="339dp"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_alignParentBottom="true"
android:layout_marginEnd="41dp"
android:layout_marginBottom="465dp"
android:text=" QUOTE OF THE DAY"
android:textColor="@color/black"
android:textSize="30sp" />
<EditText
android:layout_width="323dp"
android:layout_height="111dp"
android:layout_alignParentEnd="true"
android:layout_alignParentBottom="true"
android:layout_marginEnd="21dp"
android:layout_marginBottom="273dp"
android:text="-She decided to start living the life she imagined-"
android:textColor="@color/DarkRed"
android:textSize="25sp" />
<Button
android:layout_width="166dp"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_alignParentBottom="true"
android:layout_marginEnd="107dp"
android:layout_marginBottom="177dp"
android:background="@color/LightBlue"
android:text="UPDATE QUOTE"
android:textColor="@color/black"
android:textSize="20sp" />
<Button
android:id="@+id/logout1"
android:layout_width="166dp"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_alignParentBottom="true"
android:layout_marginEnd="43dp"
android:layout_marginBottom="75dp"
android:background="@color/Pink"
android:text="LOG OUT"
android:textColor="@color/black"
android:textSize="20sp" />
</RelativeLayout>
这是我的AccountFragment.java代码。
public class aAccountFragment extends Fragment {
Button logout1;
public aAccountFragment() {
// 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.afragment_account, container, false);
logout1 = view.findViewById(R.id.logout1);
logout1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
startActivity(new Intent(getActivity(), aloginpage.class));
Toast.makeText(getActivity().getApplicationContext(), "SUCCESSFULLY LOGOUT", Toast.LENGTH_SHORT).show();
}
});
return view;
}
}
这是我的 AccountFragment.xml 代码。
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".AccountFragment"
android:background="@drawable/ic_launcher_background">
<!-- TODO: Update blank fragment layout -->
<TextView
android:layout_width="339dp"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_alignParentBottom="true"
android:layout_marginEnd="41dp"
android:layout_marginBottom="465dp"
android:text=" QUOTE OF THE DAY"
android:textColor="@color/black"
android:textSize="30sp" />
<TextView
android:layout_width="296dp"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_alignParentBottom="true"
android:layout_marginEnd="49dp"
android:layout_marginBottom="272dp"
android:text="-She decided to start living
the life she imagined-"
android:textColor="@color/DarkRed"
android:textSize="25sp" />
<Button
android:id="@+id/logout"
android:layout_width="166dp"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_alignParentBottom="true"
android:layout_marginEnd="28dp"
android:layout_marginBottom="75dp"
android:background="@color/Pink"
android:text="LOG OUT"
android:textColor="@color/black"
android:textSize="20sp" />
</RelativeLayout>
这是我的 AccountFragment.java 代码。
public class AccountFragment extends Fragment {
Button logout;
public AccountFragment() {
// 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_account, container, false);
logout = view.findViewById(R.id.logout);
logout.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
startActivity(new Intent(getActivity(), loginpage.class));
Toast.makeText(getActivity().getApplicationContext(), "SUCCESSFULLY LOGOUT", Toast.LENGTH_SHORT).show();
}
});
return view;
}
}
第 1 步： 从 AdminFragment.java 中获取来自 edittext 的报价输入。我没有发布它的 xml 文件，因为除了 EditText 之外没有什么重要的。你可以把它放在任何 Activity.
AdminFragment.java
public class AdminFragment extends Fragment {
public static AdminFragment newInstance() {
return new AdminFragment();
}
@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container,
@Nullable Bundle savedInstanceState) {
return inflater.inflate(R.layout.main_fragment, container, false);
}
@Override
public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState){
EditText quoteEditText = view.findViewById(R.id.quote_et);
Button quoteBtn = view.findViewById(R.id.quote_btn);
quoteBtn.setOnClickListener(v -> {
String quote = quoteEditText.getText().toString();
if (quote.isEmpty()){
Toast.makeText(getContext(),"Please Enter Quote!",Toast.LENGTH_SHORT).show();
}else {
Intent intent = new Intent(getActivity(), BottomNavigationActivity.class);
intent.putExtra("quote",quote);
startActivity(intent);
}
});
}
@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
}
}
第 2 步：
正如您声明的 BottomNavigationActivity 那样，它有 3 个片段，即 SnapFragment.java、HomeFragment.java 和 AccountFragment.java。单击 BottomNavigationActivity 内的 updateQuote 按钮时，将从 AdminFragment.java 接收报价文本。在 BottomNavigationActivity 中收到 quote 后，我将打开第 3 个片段，即 AccountFragment 以显示引用的文本。
BottomNavigationActivity.java
public class BottomNavigationActivity extends AppCompatActivity {
String updatedQuote = "";
BottomNavigationViewModel bottomNavigationViewModel;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_bottom_navigation);
bottomNavigationViewModel = new ViewModelProvider(this).get(BottomNavigationViewModel.class);
BottomNavigationView navView = findViewById(R.id.nav_view);
// Passing each menu ID as a set of Ids because each
// menu should be considered as top level destinations.
AppBarConfiguration appBarConfiguration = new AppBarConfiguration.Builder(
R.id.navigation_snap, R.id.navigation_home, R.id.navigation_account)
.build();
NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment);
NavigationUI.setupActionBarWithNavController(this, navController, appBarConfiguration);
NavigationUI.setupWithNavController(navView, navController);
updatedQuote = getIntent().getStringExtra("quote");
Log.d("tisha==>>","Quote = "+updatedQuote);
bottomNavigationViewModel.setQuoteLiveData(updatedQuote);
// Below I am selecting 3rd Fragment to show Quote
navView.setSelectedItemId(R.id.navigation_account);
}
}
activity_bottom_navigation.xml
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingTop="?attr/actionBarSize">
<com.google.android.material.bottomnavigation.BottomNavigationView
android:id="@+id/nav_view"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="0dp"
android:layout_marginEnd="0dp"
android:background="?android:attr/windowBackground"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:menu="@menu/bottom_nav_menu" />
<fragment
android:id="@+id/nav_host_fragment"
android:name="androidx.navigation.fragment.NavHostFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:defaultNavHost="true"
app:layout_constraintBottom_toTopOf="@id/nav_view"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:navGraph="@navigation/mobile_navigation" />
</androidx.constraintlayout.widget.ConstraintLayout>
我在这里使用 ViewModel，因为将 quote 数据从当前 activity 传递到 AccountFragment.java 会更容易，因为 AccountFragment 未实例化通过它的构造函数。 BottomNavigationViewModel 负责存储 quote 并在需要的地方提供。
BottomNavigationViewModel.java
public class BottomNavigationViewModel extends ViewModel {
private final MutableLiveData<String> quoteLiveData;
public String getQuoteLiveData(){
return quoteLiveData.getValue();
}
public void setQuoteLiveData(String quote){
quoteLiveData.setValue(quote);
}
public BottomNavigationViewModel(){
quoteLiveData = new MutableLiveData<>();
}
}
第 3 步：
现在在 AccountFragment 中，我只得到在 BottomNavigationActivity 中创建的 view model 并从中收集 quote 并将其显示在 TextView.
AccountFragment.java
public class AccountFragment extends Fragment {
private String mQuote;
private BottomNavigationViewModel bottomNavigationViewModel;
public AccountFragment() {
// Required empty public constructor
}
public static AccountFragment newInstance(String quote) {
return new AccountFragment();
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
bottomNavigationViewModel = new ViewModelProvider(requireActivity()).get(BottomNavigationViewModel.class);
mQuote = bottomNavigationViewModel.getQuoteLiveData();
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_account, container, false);
}
@Override
public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState){
TextView quoteView = view.findViewById(R.id.quote_tv);
quoteView.setText(mQuote);
}
}