我正在开发一个Android应用程序，其中有两种类型的用户。当用户注册或登录系统时，它们将被重定向到同一主屏幕，并根据其类型查看不同的视图片段。在第一次注册时，我能够使用共享首选项实现此目的。我唯一的问题是，如果用户退出然后再次尝试登录，那么无论他是什么类型的用户，都会加载相同的主屏幕。我怀疑，活动使用最后一组共享偏好。
在我的片段中，基于userType，我膨胀了相应的xml文件。我的要求是，当用户登录时，如何给相应的xml文件充气，即。如何获取SignInActivity中的Shared首选项以加载相应的片段xml。
这是我到目前为止所尝试的内容。
MainMenuActivity.java
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main_menu);
ButterKnife.bind(this);
setSupportActionBar(toolbar);
gaFragmentStack = new Stack<>();
Fragment home_fragment = new HomeFragment();
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
transaction.replace(R.id.container_gaFragments, home_fragment);
transaction.commit();
final SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(this);
if (getUid() != null) {
String userId = getUid();
firebaseAuth = FirebaseAuth.getInstance();
databaseReference = FirebaseDatabase.getInstance().getReference().child("users").child(userId);
} else {
onAuthFailure();
}
final PrimaryDrawerItem home = new PrimaryDrawerItem().withName("Home").withIdentifier(1).withIcon(GoogleMaterial.Icon.gmd_home);
final PrimaryDrawerItem profile = new PrimaryDrawerItem().withName("Profile").withIdentifier(2).withIcon(GoogleMaterial.Icon.gmd_account);
final PrimaryDrawerItem gallery = new PrimaryDrawerItem().withName("Gallery").withIdentifier(3).withIcon(R.drawable.ic_perm_media_black_24dp);
final PrimaryDrawerItem recognition = new PrimaryDrawerItem().withName("Recognition").withIdentifier(4).withIcon(GoogleMaterial.Icon.gmd_face);
final PrimaryDrawerItem maps = new PrimaryDrawerItem().withName("Maps").withIdentifier(5).withIcon(R.drawable.ic_place_black_24dp);
final PrimaryDrawerItem tagAndLocate = new PrimaryDrawerItem().withName("Tag & Locate").withIdentifier(6).withIcon(R.drawable.ic_remove_red_eye_black_24dp);
final PrimaryDrawerItem gamesAndPuzzle = new PrimaryDrawerItem().withName("Games & Puzzles").withIdentifier(7).withIcon(R.drawable.ic_casino_black_24dp);
final PrimaryDrawerItem backup = new PrimaryDrawerItem().withName("Backup").withIdentifier(8).withIcon(GoogleMaterial.Icon.gmd_save);
final PrimaryDrawerItem logout = new PrimaryDrawerItem().withName("Logout").withIdentifier(9).withIcon(FontAwesome.Icon.faw_sign_out);
DrawerImageLoader.init(new AbstractDrawerImageLoader() {
@Override
public void set(ImageView imageView, Uri uri, Drawable placeholder) {
Picasso.with(imageView.getContext()).load(uri).placeholder(placeholder).fit().centerCrop().into(imageView);
}
@Override
public void cancel(ImageView imageView) {
Picasso.with(imageView.getContext()).cancelRequest(imageView);
}
});
String name = preferences.getString(Preferences.NAME, "");
String email = preferences.getString(Preferences.EMAIL, "");
final ProfileDrawerItem userProfile = new ProfileDrawerItem().withName(name).withEmail(email).withIcon(R.drawable.ic_account_circle_white_24dp);
headerResult = new AccountHeaderBuilder()
.withActivity(this)
.withHeaderBackground(R.drawable.header)
.withSelectionListEnabledForSingleProfile(false)
.addProfiles(userProfile)
.withOnAccountHeaderListener(new AccountHeader.OnAccountHeaderListener() {
@Override
public boolean onProfileChanged(View view, IProfile profile, boolean currentProfile) {
return false;
}
})
.build();
String userType = preferences.getString(Preferences.USER_TYPE, "");
if(userType !=null && userType.equalsIgnoreCase("Standard")) {
result = new DrawerBuilder()
.withActivity(this)
.withAccountHeader(headerResult)
.withToolbar(toolbar)
.withDisplayBelowStatusBar(false)
.withTranslucentStatusBar(true)
.withSavedInstance(savedInstanceState)
.withActionBarDrawerToggle(true)
.withActionBarDrawerToggleAnimated(true)
.addDrawerItems(home)
.addDrawerItems(profile)
.addDrawerItems(gallery)
.addDrawerItems(recognition)
.addDrawerItems(maps)
.addDrawerItems(tagAndLocate)
.addDrawerItems(gamesAndPuzzle)
.addDrawerItems(backup)
.addDrawerItems(new DividerDrawerItem())
.addDrawerItems(logout)
.buildForFragment();
result.setOnDrawerItemClickListener(new Drawer.OnDrawerItemClickListener() {
@Override
public boolean onItemClick(View view, int position, IDrawerItem drawerItem) {
int drawItemId = (int) drawerItem.getIdentifier();
Intent intent;
Fragment fragment;
switch (drawItemId) {
case 1:
fragment = new HomeFragment();
gaFragmentStack.add(home);
break;
case 2:
fragment = new ProfileFragment();
gaFragmentStack.add(profile);
break;
case 3:
fragment = new GalleryFragment();
gaFragmentStack.add(gallery);
break;
case 4:
fragment = new RecognitionFragment();
gaFragmentStack.add(recognition);
break;
case 5:
fragment = new MapsFragment();
gaFragmentStack.add(maps);
break;
case 6:
fragment = new TagLocateFragment();
gaFragmentStack.add(tagAndLocate);
break;
case 7:
fragment = new GamesPuzzlesFragment();
gaFragmentStack.add(gamesAndPuzzle);
break;
case 8:
fragment = new BackupFragment();
gaFragmentStack.add(backup);
break;
default:
fragment = new HomeFragment();
break;
}
if (drawItemId == 9) {
FirebaseAuth.getInstance().signOut();
SharedPreferences.Editor editor = preferences.edit();
editor.clear();
editor.apply();
intent = new Intent(MainMenuActivity.this, SplashScreen.class);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(intent);
finish();
}
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
transaction.replace(R.id.container_gaFragments, fragment);
transaction.commit();
return false;
}
});
}else {
result = new DrawerBuilder()
.withActivity(this)
.withAccountHeader(headerResult)
.withToolbar(toolbar)
.withDisplayBelowStatusBar(false)
.withTranslucentStatusBar(true)
.withSavedInstance(savedInstanceState)
.withActionBarDrawerToggle(true)
.withActionBarDrawerToggleAnimated(true)
.addDrawerItems(home)
.addDrawerItems(profile)
.addDrawerItems(maps)
.addDrawerItems(backup)
.addDrawerItems(new DividerDrawerItem())
.addDrawerItems(logout)
.buildForFragment();
result.setOnDrawerItemClickListener(new Drawer.OnDrawerItemClickListener() {
@Override
public boolean onItemClick(View view, int position, IDrawerItem drawerItem) {
int drawItemId = (int) drawerItem.getIdentifier();
Intent intent;
Fragment fragment;
switch (drawItemId) {
case 1:
fragment = new HomeFragment();
gaFragmentStack.add(home);
break;
case 2:
fragment = new ProfileFragment();
gaFragmentStack.add(profile);
break;
case 5:
fragment = new MapsFragment();
gaFragmentStack.add(maps);
break;
case 8:
fragment = new BackupFragment();
gaFragmentStack.add(backup);
break;
default:
fragment = new HomeFragment();
break;
}
if (drawItemId == 9) {
FirebaseAuth.getInstance().signOut();
SharedPreferences.Editor editor = preferences.edit();
editor.clear();
editor.apply();
intent = new Intent(MainMenuActivity.this, SplashScreen.class);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(intent);
finish();
}
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
transaction.replace(R.id.container_gaFragments, fragment);
transaction.commit();
return false;
}
});
}
}
SignInActivity.java
{
String email;
if(view.getId() == R.id.loginButton){
email = emailLoginTextInputEditText.getText().toString();
String password = passwordLoginEditText.getText().toString();
if (!validateEmail(email)) {
return;
}
if (!validateSetPass(password)) {
return;
}
showProgressDialog("Signing in...");
mAuth.signInWithEmailAndPassword(email,password)
.addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
@Override
public void onComplete(@NonNull Task<AuthResult> task) {
progressDialog.dismiss();
if(task.isSuccessful()){
hideProgressDialog();
DatabaseReference databaseReference = FirebaseDatabase.getInstance().getReference().child("users").child(getUid());
databaseReference.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
Profile profile = dataSnapshot.getValue(Profile.class);
Log.e("key", dataSnapshot.getKey());
SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(SignInActivity.this);
SharedPreferences.Editor editor = sharedPreferences.edit();
if(profile !=null){
editor.putString(Preferences.EMAIL, profile.getEmail());
editor.putString(Preferences.NAME, profile.getFullName());
}
editor.putString(Preferences.USERID, getUid());
editor.apply();
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
Intent loginIntent = new Intent(SignInActivity.this,MainMenuActivity.class);
loginIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(loginIntent);
finish();
}
}
});
}
else if(view.getId() == R.id.singinGoogleButton)
{
Toast.makeText(SignInActivity.this,"Signing in with google...",Toast.LENGTH_SHORT).show();
Intent signInIntent = Auth.GoogleSignInApi.getSignInIntent(mGoogleApiClient);
startActivityForResult(signInIntent, RC_SIGN_IN);
}
else if(view.getId() == R.id.signupTV)
{
Intent intent = new Intent(SignInActivity.this,SignUpActivity.class);
startActivity(intent);
finish();
}
else if (view.getId() == R.id.forgotPasswordTextView) {
Intent intent = new Intent(SignInActivity.this,ResetPasswordActivity.class);
startActivity(intent);
finish();
}
}
SignUpActivity.java
{
showProgressDialog("Saving...");
Intent intent = getIntent();
String fullName = intent.getStringExtra("fullName");
String userEmailAddress = intent.getStringExtra("emailAddress");
String userType = intent.getStringExtra("userType");
String phoneNumber = phoneNumberTextInputEditText.getText().toString().trim();
String dateOfBirth = dateofBirthTextInputEditText.getText().toString().trim();
String securityAnswer = securityAnswerTextInputEditText.getText().toString().trim();
if (!validateForm(phoneNumber, dateOfBirth, securityAnswer)) {
hideProgressDialog();
return;
}
if(userType.equalsIgnoreCase("Standard")){
hideProgressDialog();
Toast.makeText(this, "User details saved!",Toast.LENGTH_SHORT).show();
Intent guardianIntent = new Intent(ContactDetailsActivity.this, AddGuardianActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_NEW_TASK);
guardianIntent.putExtra("fullName", fullName);
guardianIntent.putExtra("userEmailAddress", userEmailAddress);
guardianIntent.putExtra("phoneNumber", phoneNumber);
guardianIntent.putExtra("dateofBirth", dateOfBirth);
guardianIntent.putExtra("userType", userType);
guardianIntent.putExtra("securityAnswer", securityAnswer);
guardianIntent.putExtra("securityQuestion", securityQuestion);
startActivity(guardianIntent);
finish();
}else{
databaseReference.child("fullName").setValue(fullName);
databaseReference.child("phoneNumber").setValue(phoneNumber);
databaseReference.child("dateOfBirth").setValue(dateOfBirth);
databaseReference.child("securityAnswer").setValue(securityAnswer);
databaseReference.child("securityQuestion").setValue(securityQuestion);
databaseReference.child("userType").setValue(userType);
databaseReference.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
Profile profile = dataSnapshot.getValue(Profile.class);
SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(ContactDetailsActivity.this);
SharedPreferences.Editor editor = preferences.edit();
if(profile != null) {
editor.putString(Preferences.NAME, profile.getFullName());
editor.putString(Preferences.EMAIL, profile.getEmail());
editor.putString(Preferences.USER_TYPE, profile.getUserType());
}
editor.putString(Preferences.USERID, getUid());
editor.apply();
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
hideProgressDialog();
Toast.makeText(this, "Profile Created", Toast.LENGTH_SHORT).show();
Intent mainMenuIntent = new Intent(ContactDetailsActivity.this, MainMenuActivity.class);
mainMenuIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(mainMenuIntent);
finish();
}
}
HomeFragment.java
{
SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(getActivity());
String userType = sharedPreferences.getString(Preferences.USER_TYPE, "");
View view;
if(userType != null && userType.equalsIgnoreCase("STANDARD")) {
view = inflater.inflate(R.layout.fragment_home, container, false);
}else{
view = inflater.inflate(R.layout.fragment_home_guardian, container, false);
}
toolbar = (Toolbar) getActivity().findViewById(R.id.toolbar);
toolbar.setTitle(getString(R.string.homeScreen));
initControls(view,userType);
return view;
}
当用户登录应用程序时，如何加载相应的片段xml？我错过了什么？请帮助。
答案 0 :(得分：0)
您正在使用getDefaultSharedPreferences()获取SharedPreference实例，但每次都使用不同的上下文。
使用getApplicationContext()代替Activity.this或this。