火力地堡检索数据customlistview [Android的]

Question

我的错误：

E/UncaughtException: com.google.firebase.database.DatabaseException: Can't convert object of type java.lang.String to type com.stitch.fractions.Profile.userInfo.UserInformation 
        at com.google.android.gms.internal.zzamy.zze(Unknown Source) 
        at com.google.android.gms.internal.zzamy.zzb(Unknown Source) 
        at com.google.android.gms.internal.zzamy.zza(Unknown Source) 
        at com.google.firebase.database.DataSnapshot.getValue(Unknown Source) 
        at com.stitch.fractions.Scoreboard.activity.activity.ScoreboardActivity$1.onDataChange(ScoreboardActivity.java:49) 
        at com.google.firebase.database.Query$1.onDataChange(Unknown Source) 
        at com.google.android.gms.internal.zzajp.zza(Unknown Source) 
        at com.google.android.gms.internal.zzakp.zzcxi(Unknown Source) 
        at com.google.android.gms.internal.zzaks$1.run(Unknown Source) 
        at android.os.Handler.handleCallback(Handler.java:743) 
        at android.os.Handler.dispatchMessage(Handler.java:95) 
        at android.os.Looper.loop(Looper.java:150) 
        at android.app.ActivityThread.main(ActivityThread.java:5546) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:794) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:684) 
I/FA: Tag Manager is not found and thus will not be used 
I/Process: Sending signal. PID: 22183 SIG: 9 
Disconnected from the target VM, address: 'localhost:8604', transport: 'socket' 

我的动态类：

public class ScoreboardActivity extends AppCompatActivity { 
    private FirebaseAuth mAuth; 
    private DatabaseReference dbRef; 
    private ArrayList<UserInformation> mArrayUserInfo = new ArrayList<>(); 
    private String userId; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_scoreboard); 

     mAuth = FirebaseAuth.getInstance(); 
     userId = mAuth.getCurrentUser().getUid(); 
     dbRef = FirebaseDatabase.getInstance().getReference(); 
     displayData(); 
    } 

    public void displayData() { 
     dbRef.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 sItem : user.getChildren()) { 
           if (!(sItem.getKey().equals("age"))) { 
            UserInformation scoreActivity = sItem.getValue(UserInformation.class); 
            mArrayUserInfo.add(scoreActivity); 
            ScoreAdapter sAdapter = new ScoreAdapter(getApplicationContext(), mArrayUserInfo); 

            ListView listScore = (ListView)findViewById(R.id.lvScore); 
             listScore.setAdapter(sAdapter); 
           } 
          } 
         } 
        } 
       } 
      } 

      @Override 
      public void onCancelled(DatabaseError databaseError) { 
       Toast.makeText(ScoreboardActivity.this, "Error Kid", Toast.LENGTH_SHORT).show(); 
      } 
     }); 
    } 
} 

这是我的模型类：

public class UserInformation { 
    public String name; 
    public String age; 
    public String score; 


    public UserInformation() { 

    } 

    public UserInformation(String name, String age, String score) { 
     this.name = name; 
     this.age = age; 
     this.score = score; 
    } 

    public String getName() { 
     return name; 
    } 

    public String getAge() { 
     return age; 
    } 

    public String getScore(){ 
     return score; 
     } 
    } 
} 

下面是如何我写到数据库：

public class ProfileActivity extends AppCompatActivity { 

private FirebaseAuth firebaseAuth; 

private TextView mUserEmail, mUserScore; 
private Button mBtnLogOut, mBtnSave, mBtnScore; 
private EditText mEdtProfileName, mEdtProfileAge; 

private DatabaseReference dbRefer; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_profile); 
    initComponent(); 
    getCurrentUser(); 
    checkCurrentUser(); 
    firebaseDatabase(); 


    mBtnLogOut.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      firebaseAuth.signOut(); 
      finish(); 
      Intent back = new Intent(ProfileActivity.this, HomeActivity.class); 
      startActivity(back); 
      Toast.makeText(ProfileActivity.this, "Good Bye", Toast.LENGTH_SHORT).show(); 
     } 
    }); 

    mBtnSave.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      saveUserInfor(); 
     } 
    }); 

    mBtnScore.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      Intent game = new Intent(ProfileActivity.this, ScoreboardActivity.class); 
      startActivity(game); 

     } 
    }); 

} 

public void initComponent() { 
    mBtnLogOut = (Button) findViewById(R.id.btnOut); 
    mUserEmail = (TextView) findViewById(R.id.userEmail); 
    firebaseAuth = FirebaseAuth.getInstance(); 
    mEdtProfileName = (EditText) findViewById(R.id.edtProfileName); 
    mEdtProfileAge = (EditText) findViewById(R.id.edtProfileAge); 
    mBtnSave = (Button) findViewById(R.id.btnSave); 
    mUserScore = (TextView) findViewById(R.id.userScore); 
    mBtnScore = (Button) findViewById(R.id.btnScore); 

} 

public void checkCurrentUser() { 
    firebaseAuth = FirebaseAuth.getInstance(); 
    if (firebaseAuth.getCurrentUser() == null) { 
     finish(); 
     Intent home = new Intent(ProfileActivity.this, HomeActivity.class); 
     startActivity(home); 
    } 
} 

public void getCurrentUser() { 
    FirebaseUser user = firebaseAuth.getCurrentUser(); 
    mUserEmail.setText("Current User: " + user.getEmail()); 

} 

public void firebaseDatabase() { 
    dbRefer = FirebaseDatabase.getInstance().getReference(); 
    mEdtProfileName.getText().toString().trim(); 
    mEdtProfileAge.getText().toString().trim(); 
} 

public void saveUserInfor() { 
    String name = mEdtProfileName.getText().toString().trim(); 
    String age = mEdtProfileAge.getText().toString().trim(); 

    SharedPreferences prefsName = getSharedPreferences("Name", MODE_PRIVATE); 
    SharedPreferences.Editor editorName = prefsName.edit(); 
    editorName.putString("sentname", name); 
    editorName.commit(); 

    SharedPreferences prefsAge = getSharedPreferences("Age", MODE_PRIVATE); 
    SharedPreferences.Editor editorAge = prefsAge.edit(); 
    editorAge.putString("sentage", age); 
    editorAge.commit(); 

    SharedPreferences prefs = getSharedPreferences("Data",MODE_PRIVATE); 
    String data = prefs.getString("time","hi"); 

    if (TextUtils.isEmpty(name)) { 
     mEdtProfileName.setError("Empty Field !!!"); 
     return; 
    } 
    if (TextUtils.isEmpty(age)) { 
    mEdtProfileAge.setError("Empty Field !!!"); 
     return; 
    } 
     UserInformation userInfo = new UserInformation(name, age, data); 
     FirebaseUser user = firebaseAuth.getCurrentUser(); 
     dbRefer.child("User").child(user.getUid()).setValue(userInfo); 
     Toast.makeText(this, "Data Saved", Toast.LENGTH_SHORT).show(); 
} 
} 

我的适配器类别：

public class ScoreAdapter extends BaseAdapter { 
private Context mContext; 
private LayoutInflater mScoreInflater; 
private ArrayList<UserInformation> mUserInfo; 

public ScoreAdapter(Context mContext, ArrayList<UserInformation> userInfo) { 
    this.mContext = mContext; 
    this.mScoreInflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
    this.mUserInfo = userInfo; 
} 

@Override 
public int getCount() { 
    return mUserInfo.size(); 
} 

@Override 
public Object getItem(int position) { 
    return mUserInfo.get(position); 
} 

@Override 
public long getItemId(int position) { 
    return position; 
} 

@Override 
public View getView(int position, View convertView, ViewGroup parent) { 
    classScoreHolder holder; 

    if (convertView == null) { 

     convertView = mScoreInflater.inflate(R.layout.scoreboard_row, parent, false); 

     holder = new classScoreHolder(); 
     holder.mTvScoreName = (TextView) convertView.findViewById(R.id.tvScoreName); 
     holder.mTvScorePoint = (TextView) convertView.findViewById(R.id.tvScorePoint); 
     convertView.setTag(holder); 
    } else { 
     holder = (classScoreHolder) convertView.getTag(); 
    } 

    TextView tvScoreName = holder.mTvScoreName; 
    TextView tvScorePoint = holder.mTvScorePoint; 

    UserInformation getUserInfo = (UserInformation) getItem(position); 

    tvScoreName.setText("User Name: " + getUserInfo.getName()); 
    tvScorePoint.setText("User Score: " + getUserInfo.getScore()); 

    return convertView; 
} 

private static class classScoreHolder { 
    public TextView mTvScoreName; 
    public TextView mTvScorePoint; 
} 

当前数据库中有姓名，年龄和分数。我试图得到的只是名称和年龄从Firebase数据库到Customlistview。

Answer 1

不是100％确定，但它看起来像你在层次结构中走得太远了一层。如果我是对的，这将简化你的代码。试试这个：

public void displayData() { 
    dbRef.addListenerForSingleValueEvent(new ValueEventListener() { 
     @Override 
     public void onDataChange(DataSnapshot dataSnapshot) { 
      for (DataSnapshot users : dataSnapshot.getChildren()) { 
       for (DataSnapshot user : users.getChildren()) { 
        if (user.getKey().equals(userId)) { 
         UserInformation scoreActivity = user.getValue(UserInformation.class); 
         mArrayUserInfo.add(scoreActivity); 
        } 
       } 
      } 
      ScoreAdapter sAdapter = new ScoreAdapter(getApplicationContext(), mArrayUserInfo); 
      ListView listScore = (ListView)findViewById(R.id.lvScore); 
      listScore.setAdapter(sAdapter); 
     } 

     @Override 
     public void onCancelled(DatabaseError databaseError) { 
      Toast.makeText(ScoreboardActivity.this, "Error Kid", Toast.LENGTH_SHORT).show(); 
     } 
    }); 
}