Это отображается в logcat; как это исправить?
com.google.firebase.database.DatabaseException: Class
com.chatapp.ChatMessage не определяет конструктор без аргументов. Если
вы используете ProGuard, убедитесь, что эти конструкторы не удалены.
на com.google.android.gms.internal.firebase_database.zzku.zza (Неизвестно
Источник)
на com.google.android.gms.internal.firebase_database.zzkt.zzb (неизвестно
Источник)
на com.google.android.gms.internal.firebase_database.zzkt.zza (Неизвестно
Источник)
на com.google.firebase.database.DataSnapshot.getValue (неизвестный источник)
в com.firebase.ui.database.FirebaseListAdapter.parseSnapshot (FirebaseListAdapter.java:127)
в com.firebase.ui.database.FirebaseListAdapter.getItem (FirebaseListAdapter.java:116)
в com.firebase.ui.database.FirebaseListAdapter.getView (FirebaseListAdapter.java:146)
на android.widget.AbsListView.obtainView (AbsListView.java:2370)
на android.widget.ListView.makeAndAddView (ListView.java:1970)
на android.widget.ListView.fillDown (ListView.java:704)
на android.widget.ListView.fillFromTop (ListView.java:765)
на android.widget.ListView.layoutChildren (ListView.java:1716)
на android.widget.AbsListView.onLayout (AbsListView.java:2162)
на android.view.View.layout (View.java:17663)
на android.view.ViewGroup.layout (ViewGroup.java:5577)
на android.widget.RelativeLayout.onLayout (RelativeLayout.java:1079)
на android.view.View.layout (View.java:17663)
на android.view.ViewGroup.layout (ViewGroup.java:5577)
на android.widget.FrameLayout.layoutChildren (FrameLayout.java:323)
на android.widget.FrameLayout.onLayout (FrameLayout.java:261)
на android.view.View.layout (View.java:17663)
на android.view.ViewGroup.layout (ViewGroup.java:5577)
на android.support.v7.widget.ActionBarOverlayLayout.onLayout (ActionBarOverlayLayout.java:443)
на android.view.View.layout (View.java:17663)
на android.view.ViewGroup.layout (ViewGroup.java:5577)
на android.widget.FrameLayout.layoutChildren (FrameLayout.java:323)
на android.widget.FrameLayout.onLayout (FrameLayout.java:261)
на android.view.View.layout (View.java:17663)
на android.view.ViewGroup.layout (ViewGroup.java:5577)
на android.widget.LinearLayout.setChildFrame (LinearLayout.java:1741)
на android.widget.LinearLayout.layoutVertical (LinearLayout.java:1585)
на android.widget.LinearLayout.onLayout (LinearLayout.java:1494)
на android.view.View.layout (View.java:17663)
на android.view.ViewGroup.layout (ViewGroup.java:5577)
на android.widget.FrameLayout.layoutChildren (FrameLayout.java:323)
на android.widget.FrameLayout.onLayout (FrameLayout.java:261)
на com.android.internal.policy.DecorView.onLayout (DecorView.java:729)
на android.view.View.layout (View.java:17663)
на android.view.ViewGroup.layout (ViewGroup.java:5577)
на android.view.ViewRootImpl.performLayout (ViewRootImpl.java:2407)
на android.view.ViewRootImpl.performTraversals (ViewRootImpl.java:2129)
на android.view.ViewRootImpl.doTraversal (ViewRootImpl.java:1315)
на android.view.ViewRootImpl $ TraversalRunnable.run (ViewRootImpl.java:6435)
на android.view.Choreographer $ CallbackRecord.run (Хореограф.java:876)
на android.view.Choreographer.doCallbacks (Choreographer.java:688)
на android.view.Choreographer.doFrame (Хореограф.java:623)
на android.view.Choreographer $ FrameDisplayEventReceiver.run (Choreographer.java:862)
на android.os.Handler.handleCallback (Handler.java:754)
на android.os.Handler.dispatchMessage (Handler.java:95)
на android.os.Looper.loop (Looper.java:163)на android.app.ActivityThread.main (ActivityThread.java:6210)
в java.lang.reflect.Method.invoke (родной метод)
на com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run (ZygoteInit.java:901)
на com.android.internal.os.ZygoteInit.main (ZygoteInit.java:791)
Вот мой код-
private static int SIGN_IN_REQUEST_CODE = 1;
private FirebaseListAdapter<ChatMessage> adapter;
RelativeLayout activity_main;
FloatingActionButton fab;
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if(item.getItemId() == R.id.menu_sign_out)
{
AuthUI.getInstance().signOut(this).addOnCompleteListener(new OnCompleteListener<Void>() {
@Override
public void onComplete(@NonNull Task<Void> task) {
Snackbar.make(activity_main,"You have been signed out.", Snackbar.LENGTH_SHORT).show();
finish();
}
});
}
return true;
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main_menu,menu);
return true;
}
@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)
{
Snackbar.make(activity_main,"Successfully signed in.Welcome!", Snackbar.LENGTH_SHORT).show();
displayChatMessage();
}
else
{
Snackbar.make(activity_main,"We couldn't sign you in.Please try again later", Snackbar.LENGTH_SHORT).show();
finish();
}
}
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
activity_main = (RelativeLayout) findViewById(R.id.activity_main);
fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
EditText input = (EditText) findViewById(R.id.input);
FirebaseDatabase.getInstance().getReference().push().setValue(new ChatMessage(input.getText().toString(), FirebaseAuth.getInstance().getCurrentUser().getEmail()));
input.setText("");
}
});
//Check if not sign-in then navigate Signin page
if(FirebaseAuth.getInstance().getCurrentUser() == null)
{
startActivityForResult(AuthUI.getInstance().createSignInIntentBuilder().build(),SIGN_IN_REQUEST_CODE);
}
else
{
Snackbar.make(activity_main,"Welcome "+FirebaseAuth.getInstance().getCurrentUser().getEmail(),Snackbar.LENGTH_SHORT).show();
//Load content
displayChatMessage();
}
}
private void displayChatMessage() {
ListView listOfMessage = (ListView) findViewById(R.id.list_of_message);
adapter = new FirebaseListAdapter<ChatMessage>(this,ChatMessage.class,R.layout.list_item,FirebaseDatabase.getInstance().getReference())
{
@Override
protected void populateView(View v, ChatMessage model, int position) {
//Get references to the views of list_item.xml
TextView messageText,messageUser,messageTime;
messageText = (TextView) v.findViewById(R.id.message_text);
messageUser = (TextView) v.findViewById(R.id.message_user);
messageTime = (TextView) v.findViewById(R.id.message_time);
messageText.setText(model.getMessageText());
messageUser.setText(model.getMessageUser());
messageTime.setText(DateFormat.format("dd-MM-yyyy (HH:mm:ss)",model.getMessageTime()));
}
};
listOfMessage.setAdapter(adapter);
}
}
gradle-
//Add Library
implementation 'com.android.support:design:26.1.0'
implementation 'com.firebaseui:firebase-ui:1.1.1'
implementation 'com.google.firebase:firebase-core:15.0.2'
implementation 'com.google.firebase:firebase-storage:15.0.2'
implementation 'com.google.firebase:firebase-database:15.0.1'
implementation 'com.google.firebase:firebase-auth:15.1.0' // ADDED
implementation 'com.google.android.gms:play-services-auth:15.0.1' // ADDED
implementation 'com.firebaseui:firebase-ui-auth:2.3.0'
implementation('com.facebook.android:facebook-android-sdk:4.22.1')
ChatMessage.java -
public class ChatMessage {
private String messageText;
private String messageUser;
private long messageTime;
public ChatMessage(String messageText, String messageUser) {
this.messageText = messageText;
this.messageUser = messageUser;
messageTime = new Date().getTime();
}
public String getMessageText() {
return messageText;
}
public String getMessageUser() {
return messageUser;
}
public long getMessageTime() {
return messageTime;
}