App planté lorsque vous cliquez dans la salle de chat

Question

J'utilisais la salle de conversation à partir de ce lien dans mon application.

https://gist.github.com/puf/f49a1b07e92952b44f2dc36d9af04e3c

Mon flux d'application:

Connexion -> MainActivity -> sélectionnez une équipe de listview à rejoindre le chat -> ChatRoomActivity

Mon problème est quand je clique sur l'un de l'équipe ma listview, il se bloque. Mon code pour le salon de discussion est exactement le même que le lien, sauf que j'ai changé MainActivity à ChatRoomActivity et supprimé la fenêtre de connexion. Le reste reste le même. Est-ce que quelqu'un peut m'aider à le corriger ou à identifier la cause?

MainActivity:

public class MainActivity extends AppCompatActivity { 
public static final String TEAM_NAME = "com.example.user.stfv2.teamname"; 
public static final String TEAM_ID = "com.example.user.stfv2.teamid"; 

private FirebaseAuth firebaseAuth; 

EditText editTextName; 
EditText textDate; 
EditText textTime; 
Spinner spinnerSport; 
Button buttonAddTeam; 
ListView listViewTeams; 
DatePickerDialog datePickerDialog; 

List<Team> teams; 

DatabaseReference databaseTeams; 

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

    firebaseAuth = FirebaseAuth.getInstance(); 

    if(firebaseAuth.getCurrentUser() == null){ 

     finish(); 

     startActivity(new Intent(this, SignInActivity.class)); 
    } 

    FirebaseUser user = firebaseAuth.getCurrentUser(); 

    databaseTeams = FirebaseDatabase.getInstance().getReference("teams"); 

    editTextName = (EditText) findViewById(R.id.editTextName); 
    spinnerSport = (Spinner) findViewById(R.id.spinnerSports); 
    listViewTeams = (ListView) findViewById(R.id.listViewTeams); 
    textDate = (EditText) findViewById(R.id.textDate); 
    textTime = (EditText) findViewById(R.id.textTime); 


    buttonAddTeam = (Button) findViewById(R.id.buttonAddTeam); 

    teams = new ArrayList<>(); 

    buttonAddTeam.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 
      Intent myIntent = new Intent(MainActivity.this, 
        AddActivity.class); 
      startActivity(myIntent); 
     } 
    }); 


    listViewTeams.setOnItemClickListener(new AdapterView.OnItemClickListener() { 
     @Override 
     public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) { 

      Team team = teams.get(i); 


      Intent intent = new Intent(getApplicationContext(), ChatRoomActivity.class); 

      intent.putExtra(TEAM_ID, team.getTeamId()); 
      intent.putExtra(TEAM_NAME, team.getTeamName()); 

      startActivity(intent); 
     } 
    }); 

    listViewTeams.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() { 
     @Override 
     public boolean onItemLongClick(AdapterView<?> adapterView, View view, int i, long l) { 
      Team team = teams.get(i); 
      showUpdateDeleteDialog(team.getTeamId(), team.getTeamName()); 
      return true; 
     } 
    }); 

} 

private void showUpdateDeleteDialog(final String teamId, String teamName) { 

    AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(this); 
    LayoutInflater inflater = getLayoutInflater(); 
    final View dialogView = inflater.inflate(R.layout.update_dialog, null); 
    dialogBuilder.setView(dialogView); 

    final EditText editTextName = (EditText) dialogView.findViewById(R.id.editTextName); 
    final Spinner spinnerSport = (Spinner) dialogView.findViewById(R.id.spinnerSports); 
    final Button buttonUpdate = (Button) dialogView.findViewById(R.id.buttonUpdateTeam); 
    final Button buttonDelete = (Button) dialogView.findViewById(R.id.buttonDeleteTeam); 
    final EditText textDate = (EditText) dialogView.findViewById(R.id.textDate); 
    final EditText textTime = (EditText) dialogView.findViewById(R.id.textTime); 

    dialogBuilder.setTitle(teamName); 
    final AlertDialog b = dialogBuilder.create(); 
    b.show(); 

    textDate.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 

      final Calendar c = Calendar.getInstance(); 
      int mYear = c.get(Calendar.YEAR); 
      int mMonth = c.get(Calendar.MONTH); 
      int mDay = c.get(Calendar.DAY_OF_MONTH); 

      datePickerDialog = new DatePickerDialog(MainActivity.this, 
        new DatePickerDialog.OnDateSetListener() { 

         @Override 
         public void onDateSet(DatePicker view, int year, 
               int monthOfYear, int dayOfMonth) { 

          textDate.setText(dayOfMonth + "/" 
            + (monthOfYear + 1) + "/" + year); 

         } 
        }, mYear, mMonth, mDay); 
      datePickerDialog.show(); 
     } 
    }); 

    textTime.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      Calendar mcurrentTime = Calendar.getInstance(); 
      int hour = mcurrentTime.get(Calendar.HOUR_OF_DAY); 
      int minute = mcurrentTime.get(Calendar.MINUTE); 
      TimePickerDialog mTimePicker; 
      mTimePicker = new TimePickerDialog(MainActivity.this, new TimePickerDialog.OnTimeSetListener() { 
       @Override 
       public void onTimeSet(TimePicker timePicker, int selectedHour, int selectedMinute) { 
        textTime.setText(selectedHour + ":" + selectedMinute); 
       } 
      }, hour, minute, true); 
      mTimePicker.setTitle("Select Time"); 
      mTimePicker.show(); 

     } 
    }); 


    buttonUpdate.setOnClickListener(new View.OnClickListener() { 

     FirebaseUser user = firebaseAuth.getCurrentUser(); 

     @Override 
     public void onClick(View view) { 
      String name = editTextName.getText().toString().trim(); 
      String sport = spinnerSport.getSelectedItem().toString(); 
      String owner = user.getUid(); 
      String date = textDate.getText().toString(); 
      String time = textTime.getText().toString(); 
      if (!TextUtils.isEmpty(name)) { 
       updateTeam(teamId, name, sport, owner, date, time); 
       b.dismiss(); 
      } 
     } 
    }); 


    buttonDelete.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 

      deleteTeam(teamId); 
      b.dismiss(); 
     } 
    }); 
} 

private boolean updateTeam(String id, String name, String sport, String owner, String date, String time) { 

    DatabaseReference dR = FirebaseDatabase.getInstance().getReference("teams").child(id); 

    Team team = new Team(id, name, sport, owner, date, time); 
    dR.setValue(team); 
    Toast.makeText(getApplicationContext(), "Team Updated", Toast.LENGTH_LONG).show(); 
    return true; 
} 

private boolean deleteTeam(String id) { 

    DatabaseReference dR = FirebaseDatabase.getInstance().getReference("teams").child(id); 


    dR.removeValue(); 


    DatabaseReference drTracks = FirebaseDatabase.getInstance().getReference("tracks").child(id); 

    drTracks.removeValue(); 
    Toast.makeText(getApplicationContext(), "Team Deleted", Toast.LENGTH_LONG).show(); 

    return true; 
} 

@Override 
protected void onStart() { 
    super.onStart(); 

    databaseTeams.addValueEventListener(new ValueEventListener() { 
     @Override 
     public void onDataChange(DataSnapshot dataSnapshot) { 


      teams.clear(); 


      for (DataSnapshot postSnapshot : dataSnapshot.getChildren()) { 

       Team team = postSnapshot.getValue(Team.class); 

       teams.add(team); 
      } 

      TeamList teamAdapter = new TeamList(MainActivity.this, teams); 

      listViewTeams.setAdapter(teamAdapter); 
     } 

     @Override 
     public void onCancelled(DatabaseError databaseError) { 

     } 
    }); 
} 

@Override 
public boolean onCreateOptionsMenu(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.action_logout: 

      firebaseAuth.signOut(); 

      finish(); 

      startActivity(new Intent(this, SignInActivity.class)); 
      return true; 
     default: 
      return super.onOptionsItemSelected(item); 
    } 
} 
} 

Logcat:

03-19 01:40:25.709 2995-2995/? E/AndroidRuntime: FATAL EXCEPTION: main 
              Process: com.example.user.stfv2, PID: 2995 
              java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.user.stfv2/com.example.user.stfv2.ChatRoomActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TextView.setText(java.lang.CharSequence)' on a null object reference 
               at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416) 
               at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476) 
               at android.app.ActivityThread.-wrap11(ActivityThread.java) 
               at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344) 
               at android.os.Handler.dispatchMessage(Handler.java:102) 
               at android.os.Looper.loop(Looper.java:148) 
               at android.app.ActivityThread.main(ActivityThread.java:5417) 
               at java.lang.reflect.Method.invoke(Native Method) 
               at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
               at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) 
               Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TextView.setText(java.lang.CharSequence)' on a null object reference 
               at com.example.user.stfv2.ChatRoomActivity.setUsername(ChatRoomActivity.java:58) 
               at com.example.user.stfv2.ChatRoomActivity.onCreate(ChatRoomActivity.java:73) 
               at android.app.Activity.performCreate(Activity.java:6237) 
               at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107) 
               at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369) 
               at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)  
               at android.app.ActivityThread.-wrap11(ActivityThread.java)  
               at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)  
               at android.os.Handler.dispatchMessage(Handler.java:102)  
               at android.os.Looper.loop(Looper.java:148)  
               at android.app.ActivityThread.main(ActivityThread.java:5417)  
               at java.lang.reflect.Method.invoke(Native Method)  
               at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)  
               at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)  

Edit 1:

layout_chat_room:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:tools="http://schemas.android.com/tools" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
android:paddingBottom="@dimen/activity_vertical_margin" 
android:paddingLeft="@dimen/activity_horizontal_margin" 
android:paddingRight="@dimen/activity_horizontal_margin" 
android:paddingTop="@dimen/activity_vertical_margin" 
tools:context="com.example.user.stfv2.MainActivity"> 

<RelativeLayout 
    android:orientation="horizontal" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:id="@+id/header" 
    android:gravity="end"> 

    <ImageView 
     android:layout_width="36dp" 
     android:layout_height="36dp" 
     android:id="@+id/userIcon" 
     android:foregroundGravity="center" 
     android:layout_alignParentStart="true" 
     android:layout_alignParentLeft="true" /> 

    <TextView 
     android:layout_width="141dp" 
     android:layout_height="wrap_content" 
     android:id="@+id/usernameTxt" 
     android:layout_toRightOf="@+id/userIcon" 
     android:layout_alignTop="@+id/userIcon" 
     android:layout_alignBottom="@+id/userIcon" 
     android:gravity="center_vertical" 
     tools:text="Username" 
     android:layout_weight="0" /> 

    <Button 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="Sign in" 
     android:id="@+id/loginBtn" 
     android:layout_alignParentEnd="true" 
     android:layout_alignParentRight="true" /> 
    <Button 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="Sign out" 
     android:id="@+id/logoutBtn" 
     android:layout_alignParentEnd="true" 
     android:layout_alignParentRight="true" /> 
</RelativeLayout> 

<android.support.v7.widget.RecyclerView 
    android:id="@+id/messagesList" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:layout_alignParentLeft="true" 
    android:layout_alignParentStart="true" 
    tools:listitem="@android:layout/two_line_list_item" 
    android:layout_above="@+id/footer" 
    android:layout_below="@+id/header" /> 

<LinearLayout 
    android:orientation="horizontal" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:layout_alignParentBottom="true" 
    android:layout_alignParentLeft="true" 
    android:layout_alignParentStart="true" 
    android:id="@+id/footer"> 

    <ImageButton 
     android:layout_width="36dp" 
     android:layout_height="36dp" 
     android:id="@+id/imageBtn" 
     android:background="@android:drawable/ic_menu_gallery" /> 

    <EditText 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:id="@+id/messageTxt" 
     android:layout_gravity="bottom" 
     android:layout_weight="1" 
     android:inputType="textShortMessage|textAutoCorrect" /> 

    <Button 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="Send" 
     android:id="@+id/sendBtn" 
     android:layout_gravity="bottom" /> 
</LinearLayout> 
</RelativeLayout> 

ChatRoomActivity:

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

static final int RC_PHOTO_PICKER = 1; 

private Button sendBtn; 
private EditText messageTxt; 
private RecyclerView messagesList; 
private ChatMessageAdapter adapter; 
private ImageButton imageBtn; 
private TextView usernameTxt; 
private View loginBtn; 
private View logoutBtn; 

private FirebaseApp app; 
private FirebaseDatabase database; 
private FirebaseAuth auth; 
private FirebaseStorage storage; 

private DatabaseReference databaseRef; 
private StorageReference storageRef; 

private String username; 

private void setUsername(String username) { 
    Log.d(TAG, "setUsername("+String.valueOf(username)+")"); 
    if (username == null) { 
     username = "Android"; 
    } 
    boolean isLoggedIn = !username.equals("Android"); 
    this.username = username; 
    this.usernameTxt.setText(username); 
    this.logoutBtn.setVisibility(isLoggedIn ? View.VISIBLE : View.GONE); 
    this.loginBtn .setVisibility(isLoggedIn ? View.GONE : View.VISIBLE); 
} 

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

    sendBtn = (Button) findViewById(R.id.sendBtn); 
    messageTxt = (EditText) findViewById(R.id.messageTxt); 
    messagesList = (RecyclerView) findViewById(R.id.messagesList); 
    imageBtn = (ImageButton) findViewById(R.id.imageBtn); 
    loginBtn = findViewById(R.id.loginBtn); 
    logoutBtn = findViewById(R.id.logoutBtn); 
    usernameTxt = (TextView) findViewById(R.id.usernameTxt); 
    setUsername("Android"); 

    LinearLayoutManager layoutManager = new LinearLayoutManager(this); 
    messagesList.setHasFixedSize(false); 
    messagesList.setLayoutManager(layoutManager); 

    // Show an image picker when the user wants to upload an imasge 
    imageBtn.setOnClickListener(new View.OnClickListener() { 
     public void onClick(View v) { 
      Intent intent = new Intent(Intent.ACTION_GET_CONTENT); 
      intent.setType("image/jpeg"); 
      intent.putExtra(Intent.EXTRA_LOCAL_ONLY, true); 
      startActivityForResult(Intent.createChooser(intent, "Complete action using"), RC_PHOTO_PICKER); 
     } 
    }); 
    // Show a popup when the user asks to sign in 
    loginBtn.setOnClickListener(new View.OnClickListener() { 
     public void onClick(View v) { 
      LoginDialog.showLoginPrompt(ChatRoomActivity.this, app); 
     } 
    }); 
    // Allow the user to sign out 
    logoutBtn.setOnClickListener(new View.OnClickListener() { 
     public void onClick(View v) { 
      auth.signOut(); 
     } 
    }); 

    adapter = new ChatMessageAdapter(this); 
    messagesList.setAdapter(adapter); 
    adapter.registerAdapterDataObserver(new RecyclerView.AdapterDataObserver() { 
     public void onItemRangeInserted(int positionStart, int itemCount) { 
      messagesList.smoothScrollToPosition(adapter.getItemCount()); 
     } 
    }); 

    // Get the Firebase app and all primitives we'll use 
    app = FirebaseApp.getInstance(); 
    database = FirebaseDatabase.getInstance(app); 
    auth = FirebaseAuth.getInstance(app); 
    storage = FirebaseStorage.getInstance(app); 

    // Get a reference to our chat "room" in the database 
    databaseRef = database.getReference("chat"); 

    sendBtn.setOnClickListener(new View.OnClickListener() { 
     public void onClick(View v) { 
      ChatMessage chat = new ChatMessage(username, messageTxt.getText().toString()); 
      // Push the chat message to the database 
      databaseRef.push().setValue(chat); 
      messageTxt.setText(""); 
     } 
    }); 
    // Listen for when child nodes get added to the collection 
    databaseRef.addChildEventListener(new ChildEventListener() { 
     public void onChildAdded(DataSnapshot snapshot, String s) { 
      // Get the chat message from the snapshot and add it to the UI 
      ChatMessage chat = snapshot.getValue(ChatMessage.class); 
      adapter.addMessage(chat); 
     } 

     public void onChildChanged(DataSnapshot dataSnapshot, String s) { } 
     public void onChildRemoved(DataSnapshot dataSnapshot) { } 
     public void onChildMoved(DataSnapshot dataSnapshot, String s) { } 
     public void onCancelled(DatabaseError databaseError) { } 
    }); 

    // When the user has entered credentials in the login dialog 
    LoginDialog.onCredentials(new OnSuccessListener<LoginDialog.EmailPasswordResult>() { 
     public void onSuccess(LoginDialog.EmailPasswordResult result) { 
      // Sign the user in with the email address and password they entered 
      auth.signInWithEmailAndPassword(result.email, result.password); 
     } 
    }); 

    // When the user signs in or out, update the username we keep for them 
    auth.addAuthStateListener(new FirebaseAuth.AuthStateListener() { 
     public void onAuthStateChanged(FirebaseAuth firebaseAuth) { 
      if (firebaseAuth.getCurrentUser() != null) { 
       // User signed in, set their email address as the user name 
       setUsername(firebaseAuth.getCurrentUser().getEmail()); 
      } 
      else { 
       // User signed out, set a default username 
       setUsername("Android"); 
      } 
     } 
    }); 
} 

public void onActivityResult(int requestCode, int resultCode, Intent data) { 
    if (requestCode == RC_PHOTO_PICKER && resultCode == RESULT_OK) { 
     Uri selectedImageUri = data.getData(); 

     // Get a reference to the location where we'll store our photos 
     storageRef = storage.getReference("chat_photos"); 
     // Get a reference to store file at chat_photos/<FILENAME> 
     final StorageReference photoRef = storageRef.child(selectedImageUri.getLastPathSegment()); 

     // Upload file to Firebase Storage 
     photoRef.putFile(selectedImageUri) 
       .addOnSuccessListener(this, new OnSuccessListener<UploadTask.TaskSnapshot>() { 
        public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) { 
         // When the image has successfully uploaded, we get its download URL 
         Uri downloadUrl = taskSnapshot.getDownloadUrl(); 
         // Set the download URL to the message box, so that the user can send it to the database 
         messageTxt.setText(downloadUrl.toString()); 
        } 
       }); 
    } 
} 
} 

Answer 1

Votre problème est que vous définissez le mauvais fichier XML. Lorsque vous avez utilisé le code de ChatroomActivity, vous avez oublié de modifier le fichier XML. Il est actuellement défini sur setContentView(R.layout.activity_main), mais il doit être setContentView(R.layout.layout_chat_room).