Wie aktualisiert man das Fragment nach dem Setzen neuer Daten? Die Daten können abgerufen werden, aber nach dem Setzen eines neuen Kontakts kann sie nicht automatisch aktualisiert werden

Question

Ich wollte das Fragment jedes Mal aktualisieren, wenn die Datenbank aktualisiert wird. Der Kontakt Setzen und Speichern in der Datenbank funktioniert gut, Daten können ebenfalls abgerufen werden. Doch jedes Mal, wenn ich versuchte, einen neuen Kontakt herzustellen, wurde die Datenbank aktualisiert, aber der Wiederherstellungsteil wird nicht aktualisiert. Es kann nur aktualisiert werden, nachdem ich zu einem anderen Fragment oder einer anderen Aktivität gewechselt habe.

// Java-Klasse-Datei

public class UserProfile extends AppCompatActivity implements OnMenuItemClickListener, OnMenuItemLongClickListener { 

private final int PICK_CONTACT = 0; 

private Toolbar mToolbar; 
private TextView mTxtToolbarTitle; 

private FragmentManager fragmentManager; 
private ContextMenuDialogFragment mMenuDialogFragment; 
private FirebaseAuth firebaseAuth; 
private DatabaseReference databaseReference; 
private Button btn_msgD; 
private String eName,eTel,userID; 
@Override 
protected void onCreate(Bundle savedInstanceState) { 

    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_m); 

    if (android.os.Build.VERSION.SDK_INT >= 21) { 
     Window window = this.getWindow(); 
     window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS); 
     window.clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);   window.setStatusBarColor(this.getResources().getColor(R.color.appbar_color)); 
    } 
    fragmentManager = getSupportFragmentManager(); 
    initToolBar(); 
    initMenuFragment(); 
    addFragment(new Fragment_US(), true, R.id.fragment); 

    databaseReference = FirebaseDatabase.getInstance().getReference(); 
    firebaseAuth = FirebaseAuth.getInstance(); 
    userID = firebaseAuth.getCurrentUser().getUid(); 
    if (firebaseAuth.getCurrentUser() == null) { 
     finish(); 
     startActivity(new Intent(this, LoginActivity.class)); 
    } 

    displayUserInfo(); 
} 

// Taste Absicht auf eine andere Seite

public void initMyAccount(View view) { 

    Intent intent = new Intent(UserProfile.this, MyAccount.class); 
    startActivity(intent); 
} 

// Schaltfläche Kontakt Set

public void initSetEmergencyContact(View view){ 
    Intent it = new Intent (Intent.ACTION_PICK,ContactsContract.Contacts.CONTENT_URI); 
    startActivityForResult(it,PICK_CONTACT); 
} 

// Abrufen von Daten aus der Datenbank und Anzeige in TextView

public void displayUserInfo(){ 

    databaseReference.addListenerForSingleValueEvent(new ValueEventListener() { 
     @Override 
     public void onDataChange(DataSnapshot dataSnapshot) { 
      for (DataSnapshot users:dataSnapshot.getChildren()) 
      { 
       for (DataSnapshot user:users.getChildren()) 
       { 
        if (user.getKey().equals(userID)) 
        { 
         for (DataSnapshot EmergencyContact:user.getChildren()) 
         { 
          if (EmergencyContact.getKey().equals("EmergencyContact")) 
          { 
           EmergencyContact ec = EmergencyContact.getValue(EmergencyContact.class); 
           TextView uInfoTV = (TextView)findViewById(R.id.textView_kNameTV); 
           TextView uInfoTV2 = (TextView)findViewById(R.id.textView_kNoTV); 
           uInfoTV.setText(ec.getkName()); 
           uInfoTV2.setText(ec.getkTel()); 
          } 
         } 
        } 
       } 
      } 
     } 

     @Override 
     public void onCancelled(DatabaseError databaseError) { 
      Toast.makeText(getApplicationContext(), "Something went wrong", Toast.LENGTH_SHORT).show(); 
     } 
    }); 
} 
public void onActivityResult(int reqCode, int resultCode, Intent data){ 
    super.onActivityResult(reqCode, resultCode, data); 

    switch(reqCode) 
    { 
     case (PICK_CONTACT): 
      if (resultCode == Activity.RESULT_OK) 
      { 
       Uri contactData = data.getData(); 
       Cursor c = managedQuery(contactData, null, null, null, null); 
       if (c.moveToFirst()) 
       { 
        String id = c.getString(c.getColumnIndexOrThrow(ContactsContract.Contacts._ID)); 

        String hasPhone = c.getString(c.getColumnIndex(ContactsContract.Contacts.HAS_PHONE_NUMBER)); 

        if (hasPhone.equalsIgnoreCase("1")) 
        { 
         Cursor phones = getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI,null, 
           ContactsContract.CommonDataKinds.Phone.CONTACT_ID +" = "+ id,null, null); 
         phones.moveToFirst(); 
         String cNumber =phones.getString(phones.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER)); 
         Toast.makeText(getApplicationContext(), cNumber, Toast.LENGTH_SHORT).show(); 

         String nameContact = phones.getString(phones.getColumnIndexOrThrow(ContactsContract.Contacts.DISPLAY_NAME)); 
         String numContact = phones.getString(phones.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER)); 

         eName = nameContact; 
         eTel = numContact; 

         Toast.makeText(getApplicationContext(), nameContact, Toast.LENGTH_SHORT).show(); 
         FirebaseUser user = firebaseAuth.getCurrentUser(); 

         EmergencyContact eCon = new EmergencyContact(eName,eTel); 
         eCon.setkName(eName); 
         eCon.setkTel(eTel); 
         databaseReference = FirebaseDatabase.getInstance().getReference(); 
         databaseReference.child("users").child(userID).child("EmergencyContact").setValue(eCon); 
         //editText.setText(nameContact+ " "+ cNumber); 
        } 
       } 
      } 
    } 
} 

// Fragment Inhalt

private void initMenuFragment() { 

    MenuParams menuParams = new MenuParams(); 
    menuParams.setActionBarSize((int) getResources().getDimension(R.dimen.tool_bar_height)); 
    menuParams.setMenuObjects(getMenuObjects()); 
    menuParams.setClosableOutside(false); 
    mMenuDialogFragment = ContextMenuDialogFragment.newInstance(menuParams); 
    mMenuDialogFragment.setItemClickListener(this); 
    mMenuDialogFragment.setItemLongClickListener(this); 
} 

private List<MenuObject> getMenuObjects() { 

    List<MenuObject> menuObjects = new ArrayList<>(); 

    MenuObject close = new MenuObject(); 
    close.setResource(R.drawable.icn_close); 

    MenuObject accPage = new MenuObject("UserProfile"); 
    accPage.setResource(R.drawable.icn_3); 

    MenuObject chat = new MenuObject("PPChat"); 
    BitmapDrawable bd = new BitmapDrawable(getResources(), 
      BitmapFactory.decodeResource(getResources(), R.drawable.icn_1)); 
    chat.setDrawable(bd); 

    MenuObject contact = new MenuObject("ContactDoctor"); 
    contact.setResource(R.drawable.icn_4); 

    menuObjects.add(close); 
    menuObjects.add(accPage); 
    menuObjects.add(chat); 
    menuObjects.add(contact); 
    return menuObjects; 
} 

// Toolbar

private void initToolBar() { 

    mToolbar = (Toolbar) findViewById(R.id.appbar); 
    mTxtToolbarTitle = (TextView) mToolbar.findViewById(R.id.txtTitle); 
    setSupportActionBar(mToolbar); 
    //mTxtToolbarTitle.setText(""); 
    if (getSupportActionBar() != null) { 
     getSupportActionBar().setHomeButtonEnabled(true); 
     getSupportActionBar().setDisplayHomeAsUpEnabled(true); 
     getSupportActionBar().setDisplayShowTitleEnabled(false); 
    } 

    mToolbar.setNavigationIcon(R.drawable.btn_back); 
    mToolbar.setNavigationOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      Intent intent = new Intent (UserProfile.this, MainActivity.class); 
      startActivity(intent); 
     } 
    }); 
    mTxtToolbarTitle.setText("User Profile"); 
} 

protected void addFragment(Fragment fragment, boolean addToBackStack, int containerId) { 

    invalidateOptionsMenu(); 
    String backStackName = fragment.getClass().getName(); 
    boolean fragmentPopped = fragmentManager.popBackStackImmediate(backStackName, 0); 
    if (!fragmentPopped) { 
     FragmentTransaction transaction = fragmentManager.beginTransaction(); 
     transaction.add(containerId, fragment, backStackName) 
       .setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN); 
     if (addToBackStack) 
      transaction.addToBackStack(backStackName); 
     transaction.commit(); 
    } 
} 

@Override 
public boolean onCreateOptionsMenu(final Menu menu) { 

    MenuInflater inflater = getMenuInflater(); 
    inflater.inflate(R.menu.menu_main, menu); 
    return true; 
} 

@Override 
public boolean onOptionsItemSelected(MenuItem item) { 

    switch (item.getItemId()) { 
     case R.id.context_menu: 
      if (fragmentManager.findFragmentByTag(ContextMenuDialogFragment.TAG) == null) { 
       mMenuDialogFragment.show(fragmentManager, ContextMenuDialogFragment.TAG); 
      } 
      //Toast.makeText(this, "Clicked on position: " , Toast.LENGTH_SHORT).show(); 
      break; 
    } 
    return super.onOptionsItemSelected(item); 
} 

@Override 
public void onBackPressed() { 

    if (mMenuDialogFragment != null && mMenuDialogFragment.isAdded()) { 
     mMenuDialogFragment.dismiss(); 
    } else { 
     finish(); 
    } 
} 

// Fragmentposition

@Override 
public void onMenuItemClick(View clickedView, int position) { 
    if(position == 1){ 
     Intent intent = new Intent(UserProfile.this, UserProfile.class); 
     startActivity(intent); 
    } 

    if(position == 2){ 
     Intent intent = new Intent(UserProfile.this, PPChat.class); 
     startActivity(intent); 
    } 

    if(position == 3){ 
     Intent intent = new Intent(UserProfile.this, ContactDoctor.class); 
     startActivity(intent); 
    } 
    // Toast.makeText(this, "Clicked on position: " + position, Toast.LENGTH_SHORT).show(); 
} 

@Override 
public void onMenuItemLongClick(View clickedView, int position) { 
    //Toast.makeText(this, "Long clicked on position: " + position, Toast.LENGTH_SHORT).show(); 
} 
} 

Answer 1

Zunächst einmal jede Aktion, die als 5 Sekunden dauern kann und Ursache ANR müssen Sie in separaten Thread ausführen, indem Sie Service oder IntentService verwenden. Danach aktualisieren Sie Ihre Informationen in der Ansicht mit der Verwendung der Klasse aus der Erweiterung ResultReceiver. Hier

ist ein Beispiel, wie ich es tue:

Fragment, aus dem Sie Daten von DB anfordern:

@EFragment(R.layout.fragment_statistics) 
public class StatisticsFragment extends Fragment { 

DbResultReceiver dbResultReceiver; 

final static String TAG = "Debug_StatFragment"; 

class DbResultReceiver extends ResultReceiver { 

    private static final String TAG = "Debug_DbResultReceiver"; 

    DbResultReceiver(Handler handler) { 
     super(handler); 
    } 

    @Override 
    protected void onReceiveResult(int resultCode, Bundle resultData) { 
     Log.d(TAG, "Result code : " + resultCode); 

     switch(resultCode){ 
      case AppConstants.RESULT_CURRENT_WEEK : 
       writeRows(resultData); 
       break; 
     } 
    } 
} 

@ViewById(R.id.tv_ex_stat) 
TextView tvExampleText; 

@Override 
public void onAttach(Context context) { 
    super.onAttach(context); 
    Log.d(TAG, "onAttach()"); 

    // Register receiver for get response from intent service 
    dbResultReceiver = new DbResultReceiver(new Handler()); 

} 

@Override 
public void onCreate(@Nullable Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    Log.d(TAG, "Starting service.. "); 

    refreshStatistics(); 
} 


private void refreshStatistics(){ 
    Log.d(TAG, "Refreshing statistics table .. "); 
    Intent intent = new Intent(getContext(), DbIntentService.class); 
    intent.setAction(ACTION_GET_WEEK_DATA); 
    intent.putExtra(EXTRAS_INTENT_RESULT, dbResultReceiver); 
    getActivity().startService(intent); 
} 

private void writeRows(Bundle data){ 

    Log.d(TAG, "Writing rows.."); 

    int rowCount = data.getInt(EXTRAS_DB_ROWS_COUNT); 
    String text = ""; 

    Log.d(TAG, "amount of rows: " + rowCount); 

    for(int i = 0; i < rowCount; i++){ 
     text += "Date : " + data.getString(AppConstants.EXTRAS_DB_DATE + i) + 
       "Amount : " + data.getLong(AppConstants.EXTRAS_DB_AMOUNT + i) + 
       "Drunk : " + data.getDouble(AppConstants.EXTRAS_DB_DRUNK + i) + "\n"; 

    } 

    tvExampleText.setText(text); 
} 

}

Und die tatsächliche IntentService:

public class DbIntentService extends IntentService { 

private Intent mIntent; 
private DbAdapter db; 

private Bundle data = null; 

private static final String TAG = "Debug_DBIntentService"; 

public DbIntentService() { 
    super(DbIntentService.class.getSimpleName()); 
    Log.d(TAG, "Start thread : " + Thread.currentThread().getName()); 
    db = new DbAdapter(this); 
} 

@Override 
protected void onHandleIntent(Intent intent) { 
    Log.d(TAG, "onHandleIntent()"); 

    int resultCode; 
    mIntent = intent; 

//  Open connection with DB 
    Log.d(TAG, "Opening database.."); 
    db.open(); 

//  Proceed request to the database 
    resultCode = proceedRequest(mIntent.getAction()); 

//  Close connection with DB 
    Log.d(TAG, "Closing database.."); 
    db.close(); 

//  Sending result back to an Activity 
    Log.d(TAG, "Sending result back to an activity.."); 
    sendResult(resultCode, data); 
} 


private int proceedRequest(String action){ 
    switch (action){ 
     case ACTION_IS_CURRENT_DAY: 
      return isCurrentDay(); 
     case ACTION_GET_DAY_DATA : 
      return getCurrentDayData(); 
     case ACTION_GET_WEEK_DATA : 
      return getCurrentWeekData(); 
    } 
    throw new IllegalArgumentException(); 
} 

/* Get the data for the current week */ 
private int getCurrentWeekData(){ 
    Log.d(TAG, "Getting data for the week.."); 

    Cursor rows = db.getCurWeekRows(); 

    int rowsCount = rows.getCount(); 
    Bundle weekData = new Bundle(); 

    int count = 0; 
    weekData.putInt(AppConstants.EXTRAS_DB_ROWS_COUNT, rowsCount); 

    if(rows.moveToFirst()){ 
     do { 
      weekData.putString(AppConstants.EXTRAS_DB_DATE + count, rows.getString(0)); 
      weekData.putLong(AppConstants.EXTRAS_DB_AMOUNT + count, rows.getLong(1)); 
      weekData.putDouble(AppConstants.EXTRAS_DB_DRUNK + count, rows.getDouble(2)); 

      Log.d(TAG, "ROW [" + count + "] date : " + rows.getString(0) + " amount : " + rows.getLong(1) + " drink : "+ rows.getDouble(2)); 

      count++; 
     } 
     while(rows.moveToNext()); 
    } 

    data = weekData; 
    return AppConstants.RESULT_CURRENT_WEEK; 
} 

private void sendResult(int resultCode, Bundle data){ 
    ResultReceiver resultReceiver = mIntent.getParcelableExtra(AppConstants.EXTRAS_INTENT_RESULT); 
    if(resultReceiver != null) { 
     resultReceiver.send(resultCode, data); 
    } 
} 
}