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我正在研究Android應用程序，其中有兩種類型的用戶。我向他們展示了同一主屏幕視圖的不同組件。所以我傳遞一個名爲「userType」的意圖字符串值來過濾顯示內容。當我第一次登錄/註冊進入應用程序時，主屏幕工作正常，意圖值不爲空無法從活動傳遞意圖字符串
我也有另一個Splash活動，在那裏我檢查用戶是否已經登錄。如果用戶登錄，我將用戶直接重定向到主屏幕。這次意圖值顯示了一個空指針。我正在使用Firebase數據庫。
這是我迄今爲止努力工作的。
發佈用於相同的必要代碼。
SignUpActivity.java
private void writeUserProfile() {
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.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);
mainMenuIntent.putExtra("userType", userType);
startActivity(mainMenuIntent);
finish();
}
}
，並在主菜單中，我篩選基於這樣的用戶類型的navigationDrawer組件。
MainMenuActivity.java
Intent intent = getIntent();
userType = intent.getStringExtra("userType");
Fragment home_fragment = new HomeFragment();
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
Bundle bundle = new Bundle();
bundle.putString("userType", userType);
home_fragment.setArguments(bundle);
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();
if(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();
Bundle bundle = new Bundle();
bundle.putString("userType", userType);
fragment.setArguments(bundle);
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();
Bundle bundle = new Bundle();
bundle.putString("userType", userType);
fragment.setArguments(bundle);
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();
Bundle bundle = new Bundle();
bundle.putString("userType", userType);
fragment.setArguments(bundle);
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);
Bundle bundle = new Bundle();
bundle.putString("userType", userType);
fragment.setArguments(bundle);
transaction.commit();
return false;
}
});
}
}
這是閃屏我最初
談論SplashActivity.java
package com.project.group.projectga.activities;
進口android.content.Intent; import android.os.Bundle;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.project.group.projectga.R;
public class SplashActivity extends CoreActivity {
FirebaseAuth firebaseAuth;
DatabaseReference databaseReference;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_splash);
if (getUid() != null) {
final String userId = getUid();
firebaseAuth = FirebaseAuth.getInstance();
databaseReference = FirebaseDatabase.getInstance().getReference().child("users").child(userId);
Thread splashThread = new Thread() {
public void run() {
try {
sleep(3000);
} catch (InterruptedException e) {
e.printStackTrace();
} finally {
if (firebaseAuth.getCurrentUser() != null) {
Intent mainMenuIntent = new Intent(SplashActivity.this, MainMenuActivity.class);
startActivity(mainMenuIntent);
finish();
} else {
Intent splashScreenIntent = new Intent(SplashActivity.this, SplashScreen.class);
startActivity(splashScreenIntent);
finish();
}
}
}
};
splashThread.start();
}
}
}
在這種情況下，當getCurrentUser不爲空，我將用戶重定向到MainMenuActivity。在MainMenuActivity這行代碼顯示了錯誤，當它不是第一次註冊/登錄
->>>> if(userType.equalsIgnoreCase("Standard")) {
result = new DrawerBuilder()
我不知道我怎麼打發USERTYPE從SplashActivity。請幫忙！
@IbrahimAli - 我知道爲什麼有空指針！我問你如何從SplashActivity傳遞userType？ –
然後，標題和正文並不真正匹配這個預期的問題。 – jdv