在我更改Firebase中的数据后，当前片段将重定向到已启动的活动。我需要更改 ManageTeam 片段中按钮的可见性。应用程序的流程是 LoginActivity - ＆gt; MainActivity - ＆gt;的 ManageTeam
LoginActivity.java
public class LoginActivity extends AppCompatActivity {
private MaterialEditText etEmail,etPassword;
private Button btnLogin,btnSignUp;
private FirebaseAuth firebaseAuth;
LinearLayout linearLayout;
private String role;
private User student;
private ProgressDialog progressDialog;
DatabaseReference databaseReference;
ValueEventListener valueEventListener;
private static String user_field = "user";
private static String pwd_field = "pwd";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
Paper.init(this);
progressDialog = new ProgressDialog(LoginActivity.this);
progressDialog.setTitle("MTCHY");
progressDialog.setMessage("Login");
progressDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
etEmail = (MaterialEditText) findViewById(R.id.etLoginEmail);
etPassword = (MaterialEditText) findViewById(R.id.etLoginPassword);
btnLogin = (Button) findViewById(R.id.btnLogin);
btnSignUp = (Button) findViewById(R.id.btnLoginSignUp);
firebaseAuth = FirebaseAuth.getInstance();
linearLayout = (LinearLayout) findViewById(R.id.loginLayout);
btnLogin.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
final String email = etEmail.getText().toString().trim();
String password = etPassword.getText().toString().trim();
if (TextUtils.isEmpty(email) || TextUtils.isEmpty(password))
{
AlertDialog.Builder builder = new AlertDialog.Builder(LoginActivity.this);
builder.setMessage("Please enter an email and password").setTitle("Warning").setPositiveButton("OK",null);
AlertDialog dialog = builder.create();
dialog.show();
}
else
{
progressDialog.show();
firebaseAuth.signInWithEmailAndPassword(email,password).addOnCompleteListener(LoginActivity.this, new OnCompleteListener<AuthResult>() {
@Override
public void onComplete(@NonNull Task<AuthResult> task) {
if(task.isSuccessful())
{
databaseReference = FirebaseDatabase.getInstance().getReference();
valueEventListener = databaseReference.child("Users").orderByChild("email").equalTo(email).addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
Paper.book().write(user_field,etEmail.getText().toString());
Paper.book().write(pwd_field,etPassword.getText().toString());
for(DataSnapshot userDataSnapshot : dataSnapshot.getChildren())
{
student = userDataSnapshot.getValue(User.class);
role = student.getUserRole();
if (role.equals("Player"))
{
progressDialog.dismiss();
startActivity(new Intent(LoginActivity.this,MainActivity.class));
finish();
}
if (role.equals("Captain"))
{
progressDialog.dismiss();
startActivity(new Intent(LoginActivity.this,MainActivity.class));
finish();
}
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
progressDialog.dismiss();
AlertDialog.Builder builder = new AlertDialog.Builder(LoginActivity.this);
builder.setMessage(databaseError.getMessage()).setTitle("Database Error").setPositiveButton("OK",null);
AlertDialog dialog = builder.create();
dialog.show();
}
});
}
}
}).addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception e) {
progressDialog.dismiss();
AlertDialog.Builder builder = new AlertDialog.Builder(LoginActivity.this);
builder.setMessage(e.getMessage()).setTitle("Login Error").setPositiveButton("OK",null);
AlertDialog dialog = builder.create();
dialog.show();
}
});
}
}
});
btnSignUp.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(LoginActivity.this,SignupActivity.class);
startActivity(intent);
}
});
String papsuser = Paper.book().read(user_field);
String pappwd = Paper.book().read(pwd_field);
System.out.println(papsuser);
System.out.println(pappwd);
if (papsuser != null && pappwd != null)
{
if(!TextUtils.isEmpty(papsuser) && !TextUtils.isEmpty(pappwd))
{
autoLogin(papsuser,pappwd);
}
}
}
@Override
protected void onDestroy() {
super.onDestroy();
databaseReference.removeEventListener(valueEventListener);
}
}
MainActivity.java
public class MainActivity extends AppCompatActivity {
private BottomNavigationView navigation;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
AHBottomNavigation bottomNavigation = (AHBottomNavigation) findViewById(R.id.bottom_navigation);
AHBottomNavigationItem item1 = new AHBottomNavigationItem("Home", R.drawable.common_google_signin_btn_icon_dark_focused, R.color.colorBottomNavigationDisable);
AHBottomNavigationItem item2 = new AHBottomNavigationItem("Manage Team", R.drawable.common_google_signin_btn_icon_dark_focused, R.color.colorAccent);
AHBottomNavigationItem item3 = new AHBottomNavigationItem("Setting", R.drawable.common_google_signin_btn_icon_dark_focused,R.color.colorPrimary);
bottomNavigation.addItem(item1);
bottomNavigation.addItem(item2);
bottomNavigation.addItem(item3);
bottomNavigation.setDefaultBackgroundColor(getResources().getColor(R.color.colorBackgroud));
bottomNavigation.setCurrentItem(0);
bottomNavigation.setAccentColor(getResources().getColor(R.color.colorPrimary));
bottomNavigation.setInactiveColor(getResources().getColor(R.color.colorAccent));
bottomNavigation.setForceTint(true);
bottomNavigation.setTitleState(AHBottomNavigation.TitleState.ALWAYS_SHOW);
AFragment aFragment = new AFragment();
getSupportFragmentManager().beginTransaction().replace(R.id.content, aFragment).commit();
bottomNavigation.setOnTabSelectedListener(new AHBottomNavigation.OnTabSelectedListener() {
@Override
public boolean onTabSelected(int position, boolean wasSelected) {
if(position == 0) {
AFragment aFragment = new AFragment();
getSupportFragmentManager().beginTransaction().replace(R.id.content, aFragment).commit();
return true;
}
else if(position == 1 )
{
ManageTeam manageTeam = new ManageTeam();
getSupportFragmentManager().beginTransaction().replace(R.id.content,manageTeam).commit();
return true;
}
return false;
}
});
}
}
ManageTeam.java
@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
btn = (Button) getView().findViewById(R.id.btnJohn);
users = FirebaseDatabase.getInstance().getReference("Users");
value = users.orderByChild("email").equalTo("viginesjohn2@gmail.com").addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
for(DataSnapshot clubDataSnapshot : dataSnapshot.getChildren())
{
User user = clubDataSnapshot.getValue(User.class);
if (user.getHasTeam() == true)
{
btn.setVisibility(View.GONE);
}
if (user.getHasTeam() == false)
{
btn.setVisibility(View.VISIBLE);
}
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
users.removeEventListener(value);
}
火力地堡 My firebase data
UI Android UI 根据用户界面，活动将在Home上开始。在Firebase中将 hasTeam 字段更改为 true 或 false 之后。 Fragment更新了UI，但它将重定向回Home Activity。
