如何在fragement中刷新listview？ 现在，仅当键盘输入消失时才会刷新listview 我该怎么做才能刷新listview 这是创建viewpager的主要活动。
```java
public class Login extends AppCompatActivity {
private FirebaseAuth mFirebaseAuth;
private FirebaseAuth.AuthStateListener mAuthStateListener;
public static final int RC_SIGN_IN = 1;
private TabLayout tabLayout;
private ViewPager viewPager;
TabPagerAdapter pagerAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
mFirebaseAuth = FirebaseAuth.getInstance();
mAuthStateListener = new FirebaseAuth.AuthStateListener() {
@Override
public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
FirebaseUser user = firebaseAuth.getCurrentUser();
if (user != null) {
} else {
startActivityForResult(
AuthUI.getInstance()
.createSignInIntentBuilder()
.setTheme(R.style.FullscreenTheme)
.setIsSmartLockEnabled(false)
.setProviders(
AuthUI.EMAIL_PROVIDER,
AuthUI.GOOGLE_PROVIDER,
AuthUI.FACEBOOK_PROVIDER,
AuthUI.TWITTER_PROVIDER)
.build(),
RC_SIGN_IN);
}
}
};
tabLayout = (TabLayout) findViewById(R.id.tabLayout);
tabLayout.addTab(tabLayout.newTab().setText("Category"));
tabLayout.addTab(tabLayout.newTab().setText("Search"));
tabLayout.addTab(tabLayout.newTab().setText("My page"));
tabLayout.setTabGravity(TabLayout.GRAVITY_FILL);
viewPager = (ViewPager) findViewById(pager);
pagerAdapter = new TabPagerAdapter(getSupportFragmentManager(), tabLayout.getTabCount());
viewPager.setAdapter(pagerAdapter);
viewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
tabLayout.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
@Override
public void onTabSelected(TabLayout.Tab tab) {
viewPager.setCurrentItem(tab.getPosition());
}
@Override
public void onTabUnselected(TabLayout.Tab tab) {
}
@Override
public void onTabReselected(TabLayout.Tab tab) {
}
});
}
@Override
protected void onPause() {
super.onPause();
if (mAuthStateListener != null) {
mFirebaseAuth.removeAuthStateListener(mAuthStateListener);
}
}
@Override
protected void onResume() {
super.onResume();
mFirebaseAuth.addAuthStateListener(mAuthStateListener);
}
}
```
这是创建listview的地方。 我是否必须在这里做一些事情来刷新listview？
```java
public class SearchFragment extends android.support.v4.app.Fragment {
FirebaseDatabase mFirebaseDatabase;
public SearchFragment() {
// Required empty public constructor
}
Spinner spinner;
String[] categories = {"Family", "Love", "Friends", "Job", "Happiness", "Encouragement"};
Context mCotext;
String category;
EditText editText;
String searchTarget;
Button searchBtn;
ListView listView;
private PostAdapter mPostAdapter;
List<PostItem> postItems;
InputMethodManager inputMethodManager;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_search, null);
mCotext = getActivity().getApplicationContext();
// spinner part -> get target search category
spinner = (Spinner) view.findViewById(R.id.spinner);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(mCotext, android.R.layout.simple_spinner_dropdown_item, categories);
spinner.setAdapter(adapter);
spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
category = categories[position];
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
category = categories[0];
}
});
editText = (EditText) view.findViewById(R.id.searchBox);
searchBtn = (Button) view.findViewById(R.id.searchBtn);
searchBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mPostAdapter.clear(); //리스트 어답터를 비워준다
searchTarget = editText.getText().toString();
serach(category, searchTarget);
mPostAdapter.notifyDataSetChanged();
//downKeyboard(mCotext, editText);
}
});
listView = (ListView) view.findViewById(R.id.list);
postItems = new ArrayList<>();
mPostAdapter = new PostAdapter(mCotext, R.layout.post_item, postItems);
listView.setAdapter(mPostAdapter);
return view;
}
private void serach(String category, final String target) {
if (target.trim().equals("")) {
Toast.makeText(mCotext, "Please type something to search", Toast.LENGTH_LONG).show();
} else {
mFirebaseDatabase = FirebaseDatabase.getInstance();
Query postSearchQuery = mFirebaseDatabase.getReference().child(category).limitToFirst(30);
postSearchQuery.addChildEventListener(new ChildEventListener() {
@Override
public void onChildAdded(DataSnapshot dataSnapshot, String s) {
for (DataSnapshot postSnapshot : dataSnapshot.getChildren()) {
if (postSnapshot.getValue().toString().contains(target)) {
PostItem post = dataSnapshot.getValue(PostItem.class);
mPostAdapter.insert(post, 0);
}
}
}
@Override
public void onChildChanged(DataSnapshot dataSnapshot, String s) {
}
@Override
public void onChildRemoved(DataSnapshot dataSnapshot) {
}
@Override
public void onChildMoved(DataSnapshot dataSnapshot, String s) {
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
}
public static void downKeyboard(Context context, EditText editText) {
InputMethodManager mInputMethodManager = (InputMethodManager) context.getSystemService(Context.INPUT_METHOD_SERVICE);
mInputMethodManager.hideSoftInputFromWindow(editText.getWindowToken(), 0);
}
}
```
答案 0 :(得分：0)
可能是这样的：
adapter.notifyDataSetChanged();