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未能将java.lang.String类型的值转换为int

java 来源:TheRapidSloth 3次浏览

我想我已经在Firebase或Android Studio中发现了一个错误。
我添加的代码(FIG1)至ChatActivity.java,我得到一个错误:未能将java.lang.String类型的值转换为int

(com.google.firebase.database.DatabaseException: Failed to convert a value of type java.lang.String to int)

但是,当我删除代码(FIG1),我仍然在包含每个脚本(fig2)接收消息。
为什么在删除它之后将它引用到整数而不是字符串?

FIG1(代码)

private FirebaseDatabase database; 
private DatabaseReference myConnectionsRef; 
... 

protected void onCreate(Bundle savedInstanceState) {...`  database = FirebaseDatabase.getInstance(); 
    myConnectionsRef = database.getReference("users/" + FirebaseAuth.getInstance().getCurrentUser().getUid() + "/n_newmessages_c");` fab.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 
      if (input.getText().toString().trim().equals("")) { 
       Toast.makeText(ChatActivity.this, "Please enter some texts!", Toast.LENGTH_SHORT).show(); 
      } else {....     myConnectionsRef.addListenerForSingleValueEvent(new ValueEventListener() { 
        @Override 
        public void onDataChange(com.google.firebase.database.DataSnapshot dataSnapshot) { 
         try{ 
          notifMcount = (long) dataSnapshot.getValue(); 
          Log.e(TAG, "onDataChange: NOTIFICATION COUNT MESSAGES--------------------- = " + notifMcount); 
          long newNotifAmount = notifMcount + 1; 
          myRef.child(getString(R.string.dbname_users)) 
            .child(mUser.getUser_id()) 
            .child("n_newmessages_c") 
            .setValue(newNotifAmount); 

         }catch (NullPointerException e){ 
          Log.e(TAG, "onDataChange: NullPointerException" + e.getMessage()); 
         } 
        } 

        @Override 
        public void onCancelled(DatabaseError databaseError) { 

        } 
       }); 

fig2(代码)(从MessengerFriendsOnline.java

private void updateUserslist(){ 
    Log.d(TAG, "updateUsersList: updating users list"); 

    mAdapter = new MessagesListAdapter(getActivity(), R.layout.layout_friend_listitem, mUserList); 

    mListView.setAdapter(mAdapter); 

    mListView.setOnItemClickListener(new AdapterView.OnItemClickListener() { 
     @Override 
     public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 
      Log.d(TAG, "onItemClick: selected user: " + mUserList.get(position).toString()); 

      //navigate to profile activity 
      Intent intent = new Intent(getActivity(), ChatActivity.class); 
      intent.putExtra(getString(R.string.intent_user), mUserList.get(position)); 
      startActivity(intent); 
     } 
    }); 

} 

private void updateFriendsList(){ 
    Log.d(TAG, "getPhotos: getting Friend(s)"); 
    DatabaseReference reference = FirebaseDatabase.getInstance().getReference(); 
    for(int i = 0; i < mFriends.size(); i++){ 
     final int count = i; 
     Query query = reference 
       .child(getString(R.string.dbname_users)) 
       .orderByChild(getString(R.string.field_user_id)) 
       .equalTo(mFriends.get(i)); 
     query.addListenerForSingleValueEvent(new ValueEventListener() { 
      @Override 
      public void onDataChange(DataSnapshot dataSnapshot) { 
       for(DataSnapshot singleSnapshot : dataSnapshot.getChildren()){ 
        //boolean is_Online = singleSnapshot.getValue(User.class).isOnline(); 
        // Log.w(TAG, "onDataChange: FRIEND IS ONLINE ********************** = " + is_Online); 
        //if(is_Online == true) { 
         mUserList.add(singleSnapshot.getValue(User.class)); 
        //} 
       } 
       if(count >= mFriends.size() - 1){ 
        updateUserslist(); 
       } 
      } 

      @Override 
      public void onCancelled(DatabaseError databaseError) { 

      } 
     }); 
    } 
} 


private void getFriends(){ 
    Log.d(TAG, "getFollowing: searching for FRIENDS **************************************"); 
    mFriends.clear(); 
    mUserList.clear(); 
    DatabaseReference reference = FirebaseDatabase.getInstance().getReference(); 
    Query query = reference 
      .child(getString(R.string.dbname_friends)) 
      .child(FirebaseAuth.getInstance().getCurrentUser().getUid()); 
    query.addListenerForSingleValueEvent(new ValueEventListener() { 
     @Override 
     public void onDataChange(DataSnapshot dataSnapshot) { 
      for (DataSnapshot singleSnapshot : dataSnapshot.getChildren()) { 
       Log.d(TAG, "onDataChange: found friend----------------**: " + singleSnapshot.getValue(User.class).toString()); 

       mFriends.add(singleSnapshot.child(getString(R.string.field_user_id)).getValue().toString()); 

       Log.d(TAG, "onDataChange: Freinds user id: " + mFriends.toString() ); 
      } 
      //get the photos 
      updateFriendsList(); 
     } 

     @Override 
     public void onCancelled(DatabaseError databaseError) { 

     } 
    }); 
} 

ChatActivity.java

public class ChatActivity extends AppCompatActivity { 
private static final String TAG = "ChatActivity"; 

private static final int SIGN_IN_REQUEST_CODE = 111; 
private FirebaseListAdapter<ChatMessage> adapter; 
private ListView listView; 
private String loggedInUserName = ""; 
private int messagesCount = 0; 
private DatabaseReference myRef; 
private long notifMcount; 
Map data; 

private FirebaseDatabase database; 
private DatabaseReference myConnectionsRef; 

private User mUser; 
@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_chat); 
    myRef = FirebaseDatabase.getInstance().getReference(); 

    //find views by Ids 
    FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab); 
    final EditText input = (EditText) findViewById(R.id.input); 
    listView = (ListView) findViewById(R.id.list); 

    data = new HashMap(); 

    try { 
     mUser = getUserFromBundle(); 
     //init(); 
    }catch (NullPointerException e){ 
     Log.e(TAG, "NullPointerException: " + e.getMessage()); 
     Toast.makeText(this, "Something went wrong", Toast.LENGTH_SHORT).show(); 
     getSupportFragmentManager().popBackStack(); 
    } 

    if (FirebaseAuth.getInstance().getCurrentUser() == null) { 
     // Start sign in/sign up activity 
     startActivityForResult(AuthUI.getInstance() 
       .createSignInIntentBuilder() 
       .build(), SIGN_IN_REQUEST_CODE); 
    } else { 
     // User is already signed in, show list of messages 
     showAllOldMessages(); 
    } 
    database = FirebaseDatabase.getInstance(); 
    myConnectionsRef = database.getReference("users/" + FirebaseAuth.getInstance().getCurrentUser().getUid() + "/n_newmessages_c"); 
    Log.d(TAG, "onCreate: USER SELECT TO CHAT WITH********************** " + mUser.getUser_id()); 

    fab.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 
      if (input.getText().toString().trim().equals("")) { 
       Toast.makeText(ChatActivity.this, "Please enter some texts!", Toast.LENGTH_SHORT).show(); 
      } else { 
       Log.d(TAG, "onDataChange: Messages -- BEFORE 2 *******************************" + messagesCount); 

       myRef.child(getString(R.string.dbname_messages)) 
         .child(FirebaseAuth.getInstance().getCurrentUser().getUid()) 
         .child(mUser.getUser_id()) 
         .child("Chat") 
         .push() 
         .setValue(new ChatMessage(input.getText().toString(), 
           FirebaseAuth.getInstance().getCurrentUser().getEmail(), 
           FirebaseAuth.getInstance().getCurrentUser().getUid()) 
         ); 
       Log.d(TAG, "onDataChange: Messages AFTER 1 --- *******************************" + messagesCount); 

       myRef.child(getString(R.string.dbname_messages)) 
         .child(mUser.getUser_id()) 
         .child(FirebaseAuth.getInstance().getCurrentUser().getUid()) 
         .child("Chat") 
         .push() 
         .setValue(new ChatMessage(input.getText().toString(), 
           FirebaseAuth.getInstance().getCurrentUser().getEmail(), 
           FirebaseAuth.getInstance().getCurrentUser().getUid()) 
         ); 
       myRef.child(getString(R.string.dbname_messages)) 
         .child(mUser.getUser_id()) 
         .child(FirebaseAuth.getInstance().getCurrentUser().getUid()) 
         .child("ChatSettings") 
         .child("new_message_n") 
         .setValue(true); 

       myConnectionsRef.addListenerForSingleValueEvent(new ValueEventListener() { 
        @Override 
        public void onDataChange(com.google.firebase.database.DataSnapshot dataSnapshot) { 
         try{ 
          notifMcount = (long) dataSnapshot.getValue(); 
          Log.e(TAG, "onDataChange: NOTIFICATION COUNT MESSAGES--------------------- = " + notifMcount); 
          long newNotifAmount = notifMcount + 1; 
          myRef.child(getString(R.string.dbname_users)) 
            .child(mUser.getUser_id()) 
            .child("n_newmessages_c") 
            .setValue(newNotifAmount); 

         }catch (NullPointerException e){ 
          Log.e(TAG, "onDataChange: NullPointerException" + e.getMessage()); 
         } 
        } 

        @Override 
        public void onCancelled(DatabaseError databaseError) { 

        } 
       }); 
       long newNotifAmount = notifMcount + 1; 
       myRef.child(getString(R.string.dbname_users)) 
         .child(mUser.getUser_id()) 
         .child("n_newmessages_c") 
         .setValue(newNotifAmount); 



       Log.d(TAG, "onDataChange: Messages AFTER 2 --- *******************************" + messagesCount); 
      } 
     } 
    }); 
} 

@Override 
protected void onActivityResult(int requestCode, int resultCode, Intent data) 
{ 
    super.onActivityResult(requestCode, resultCode, data); 

    if (requestCode == SIGN_IN_REQUEST_CODE) { 
     if (resultCode == RESULT_OK) { 
      Toast.makeText(this, "Signed in successful!", Toast.LENGTH_LONG).show(); 
      showAllOldMessages(); 
     } else { 
      Toast.makeText(this, "Sign in failed, please try again later", Toast.LENGTH_LONG).show(); 
      finish(); 
     } 
    } 
} 

private void showAllOldMessages() { 
    loggedInUserName = FirebaseAuth.getInstance().getCurrentUser().getUid(); 
    Log.d("Main", "user id: " + loggedInUserName); 

    adapter = new MessageAdapter(this, ChatMessage.class, R.layout.item_in_message, 
      FirebaseDatabase.getInstance().getReference().child(getString(R.string.dbname_messages)) 
        .child(FirebaseAuth.getInstance().getCurrentUser().getUid()) 
        .child(mUser.getUser_id()) 
        .child("Chat")); 
    listView.setAdapter(adapter); 
} 


private User getUserFromBundle(){ 
    Bundle bundle = getIntent().getExtras(); 

    if(bundle != null){ 
     return bundle.getParcelable(getString(R.string.intent_user)); 
    }else{ 
     return null; 
    } 
} 
@Override 
public void onStart() { 
    super.onStart(); 
    myRef.child(getString(R.string.dbname_messages)) 
      .child(FirebaseAuth.getInstance().getCurrentUser().getUid()) 
      .child(mUser.getUser_id()) 
      .child("ChatSettings") 
      .child("new_message_n") 
      .setValue(false); 

} 

@Override 
public void onStop() { 
    super.onStop(); 
    myRef.child(getString(R.string.dbname_messages)) 
      .child(FirebaseAuth.getInstance().getCurrentUser().getUid()) 
      .child(mUser.getUser_id()) 
      .child("ChatSettings") 
      .child("new_message_n") 
      .setValue(false); 

} 

错误消息:

12-02 18:04:39.200 19657-19657/com.example.user.someapp E/MessengerMessagesFragme: getFollowing: searching for FRIENDS ************************************** 
12-02 18:04:40.106 3829-530/? E/ctxmgr: [AppIntervalImpl]closeInterval: ongoing 
12-02 18:04:41.046 1472-1561/? E/TaskPersister: File error accessing recents directory (directory doesn't exist?). 
12-02 18:04:49.056 1472-1485/? E/memtrack: Couldn't load memtrack module 
12-02 18:05:00.002 1472-1485/? E/memtrack: Couldn't load memtrack module 
12-02 18:05:06.403 1472-1485/? E/memtrack: Couldn't load memtrack module 
12-02 18:05:06.419 1472-1485/? E/memtrack: Couldn't load memtrack module 
12-02 18:05:09.294 1472-1485/? E/memtrack: Couldn't load memtrack module 
12-02 18:05:09.298 1472-1489/? E/BatteryStatsService: modem info is invalid: ModemActivityInfo{ mTimestamp=0 mSleepTimeMs=0 mIdleTimeMs=0 mTxTimeMs[]=[0, 0, 0, 0, 0] mRxTimeMs=0 mEnergyUsed=0} 
12-02 18:05:11.297 19657-19657/com.example.user.someapp E/libEGL: call to OpenGL ES API with no current context (logged once per thread) 
12-02 18:05:11.408 19657-19657/com.example.user.someapp E/AndroidRuntime: FATAL EXCEPTION: main 
                        Process: com.example.user.someapp, PID: 19657 
                        com.google.firebase.database.DatabaseException: Failed to convert a value of type java.lang.String to int 
                         at com.google.android.gms.internal.zzekp.zzb(Unknown Source:180) 
                         at com.google.android.gms.internal.zzekp.zza(Unknown Source:312) 
                         at com.google.android.gms.internal.zzekp.zzb(Unknown Source:0) 
                         at com.google.android.gms.internal.zzekq.zze(Unknown Source:153) 
                         at com.google.android.gms.internal.zzekp.zzb(Unknown Source:772) 
                         at com.google.android.gms.internal.zzekp.zza(Unknown Source:0) 
                         at com.google.firebase.database.DataSnapshot.getValue(Unknown Source:10) 
                         at com.example.user.someapp.MessengerFriendsOnline$2.onDataChange(MessengerFriendsOnline.java:146) 
                         at com.google.firebase.database.zzp.onDataChange(Unknown Source:7) 
                         at com.google.android.gms.internal.zzeex.zza(Unknown Source:13) 
                         at com.google.android.gms.internal.zzegs.zzbwg(Unknown Source:2) 
                         at com.google.android.gms.internal.zzegy.run(Unknown Source:65) 
                         at android.os.Handler.handleCallback(Handler.java:789) 
                         at android.os.Handler.dispatchMessage(Handler.java:98) 
                         at android.os.Looper.loop(Looper.java:164) 
                         at android.app.ActivityThread.main(ActivityThread.java:6541) 
                         at java.lang.reflect.Method.invoke(Native Method) 
                         at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240) 
                         at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767) 


===========解决方案如下:

首先,这是从DataSnapshot弄了半天

notifMcount = dataSnapshot.getValue(Long.class) 

其次,正确的方法,你的用户类有一个错误的数据类型

mUserList.add(singleSnapshot.getValue(User.class)); 

东西是一个字符串,但实际上一个int在Firebase中。查看您的代码,并将字符串字段与不包含引号的值进行比较。Firebase


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