问题：
无法从firebase数据库加载新活动中firebase回收器视图适配器上的数据
司马璞
这是mainactivity代码
package com.example.sharma.digimenu;
import android.content.DialogInterface;
import android.content.Intent;
import android.support.annotation.NonNull;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.Button;
import android.widget.RelativeLayout;
import com.example.sharma.digimenu.Common.Common;
import com.example.sharma.digimenu.Model.User;
import com.google.android.gms.tasks.OnFailureListener;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.firebase.auth.AuthResult;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.rengwuxian.materialedittext.MaterialEditText;
import java.util.Objects;
public class MainActivity extends AppCompatActivity {
Button btnSignIn, btnSignUp;
RelativeLayout rootLayout;
FirebaseAuth auth;
FirebaseDatabase db;
DatabaseReference users;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
auth = FirebaseAuth.getInstance();
db = FirebaseDatabase.getInstance();
users = db.getReference("Users");
btnSignIn = (Button) findViewById(R.id.btnSignIn);
btnSignUp = (Button) findViewById(R.id.btnSignUp);
rootLayout = (RelativeLayout) findViewById(R.id.rootLayout);
btnSignUp.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
showSignUpDialog();
}
});
btnSignIn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
showSignInDialog();
}
});
}
private void showSignUpDialog() {
final AlertDialog.Builder dialog = new AlertDialog.Builder(this);
dialog.setTitle("SIGN UP");
dialog.setMessage("Please use email to sign up");
LayoutInflater inflater = LayoutInflater.from(this);
View signup_layout = inflater.inflate(R.layout.layout_signup, null);
final MaterialEditText edtEmail = signup_layout.findViewById(R.id.edtEmail);
final MaterialEditText edtPassword = signup_layout.findViewById(R.id.edtPassword);
final MaterialEditText edtName = signup_layout.findViewById(R.id.edtName);
final MaterialEditText edtPhone = signup_layout.findViewById(R.id.edtPhone);
dialog.setView(signup_layout);
dialog.setPositiveButton("SIGN UP", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
dialogInterface.dismiss();
if (TextUtils.isEmpty(edtEmail.getText().toString())) {
Snackbar.make(rootLayout, "Please enter email address", Snackbar.LENGTH_SHORT).show();
return;
}
if (TextUtils.isEmpty(edtPhone.getText().toString())) {
Snackbar.make(rootLayout, "Please enter phone number", Snackbar.LENGTH_SHORT).show();
return;
}
if (TextUtils.isEmpty(edtPassword.getText().toString())) {
Snackbar.make(rootLayout, "Please enter password", Snackbar.LENGTH_SHORT).show();
return;
}
if (edtPassword.getText().toString().length() < 6) {
Snackbar.make(rootLayout, "Password too short!!!", Snackbar.LENGTH_SHORT).show();
return;
}
auth.createUserWithEmailAndPassword(edtEmail.getText().toString(), edtPassword.getText().toString())
.addOnSuccessListener(new OnSuccessListener<AuthResult>() {
@Override
public void onSuccess(AuthResult authResult) {
User user = new User();
user.setEmail(edtEmail.getText().toString());
user.setPassword(edtPassword.getText().toString());
user.setPhone(edtPhone.getText().toString());
user.setName(edtName.getText().toString());
users.child(Objects.requireNonNull(FirebaseAuth.getInstance().getCurrentUser()).getUid()).setValue(user)
.addOnSuccessListener(new OnSuccessListener<Void>() {
@Override
public void onSuccess(Void aVoid) {
Snackbar.make(rootLayout, "Register Successfully", Snackbar.LENGTH_SHORT)
.show();
}
})
.addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception e) {
Snackbar.make(rootLayout, "Failed" + e.getMessage(), Snackbar.LENGTH_SHORT)
.show();
}
})
.addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception e) {
Snackbar.make(rootLayout, "Failed" + e.getMessage(), Snackbar.LENGTH_SHORT)
.show();
}
});
}
});
}
});
dialog.setNegativeButton("CANCEL", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
dialogInterface.dismiss();
}
});
dialog.show();
}
private void showSignInDialog() {
final AlertDialog.Builder dialog = new AlertDialog.Builder(this);
dialog.setTitle("SIGN IN");
dialog.setMessage("Please use email to sign in");
LayoutInflater inflater = LayoutInflater.from(this);
View signin_layout = inflater.inflate(R.layout.layout_signin, null);
final MaterialEditText edtEmail = signin_layout.findViewById(R.id.edtEmail);
final MaterialEditText edtPassword = signin_layout.findViewById(R.id.edtPassword);
dialog.setView(signin_layout);
dialog.setPositiveButton("SIGN IN", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
dialogInterface.dismiss();
if (TextUtils.isEmpty(edtEmail.getText().toString())) {
Snackbar.make(rootLayout, "Please enter email address", Snackbar.LENGTH_SHORT).show();
return;
}
if (TextUtils.isEmpty(edtPassword.getText().toString())) {
Snackbar.make(rootLayout, "Please enter password", Snackbar.LENGTH_SHORT).show();
return;
}
if (edtPassword.getText().toString().length() < 6) {
Snackbar.make(rootLayout, "Password too short!!!", Snackbar.LENGTH_SHORT).show();
return;
}
auth.signInWithEmailAndPassword(edtEmail.getText().toString(), edtPassword.getText().toString())
.addOnSuccessListener(new OnSuccessListener<AuthResult>() {
public User user;
@Override
public void onSuccess(AuthResult authResult) {
startActivity(new Intent(MainActivity.this, Home.class));
Common.currentUser = user;
finish();
}
})
.addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception e) {
Snackbar.make(rootLayout, "Failed" + e.getMessage(), Snackbar.LENGTH_SHORT).show();
}
});
}
});
dialog.setNegativeButton("CANCEL", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
dialogInterface.dismiss();
}
});
dialog.show();
}
}
这是Home.java
package com.example.sharma.digimenu;
import android.content.DialogInterface;
import android.content.Intent;
import android.support.annotation.NonNull;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.Button;
import android.widget.RelativeLayout;
import com.example.sharma.digimenu.Common.Common;
import com.example.sharma.digimenu.Model.User;
import com.google.android.gms.tasks.OnFailureListener;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.firebase.auth.AuthResult;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.rengwuxian.materialedittext.MaterialEditText;
import java.util.Objects;
public class MainActivity extends AppCompatActivity {
Button btnSignIn, btnSignUp;
RelativeLayout rootLayout;
FirebaseAuth auth;
FirebaseDatabase db;
DatabaseReference users;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
auth = FirebaseAuth.getInstance();
db = FirebaseDatabase.getInstance();
users = db.getReference("Users");
btnSignIn = (Button) findViewById(R.id.btnSignIn);
btnSignUp = (Button) findViewById(R.id.btnSignUp);
rootLayout = (RelativeLayout) findViewById(R.id.rootLayout);
btnSignUp.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
showSignUpDialog();
}
});
btnSignIn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
showSignInDialog();
}
});
}
private void showSignUpDialog() {
final AlertDialog.Builder dialog = new AlertDialog.Builder(this);
dialog.setTitle("SIGN UP");
dialog.setMessage("Please use email to sign up");
LayoutInflater inflater = LayoutInflater.from(this);
View signup_layout = inflater.inflate(R.layout.layout_signup, null);
final MaterialEditText edtEmail = signup_layout.findViewById(R.id.edtEmail);
final MaterialEditText edtPassword = signup_layout.findViewById(R.id.edtPassword);
final MaterialEditText edtName = signup_layout.findViewById(R.id.edtName);
final MaterialEditText edtPhone = signup_layout.findViewById(R.id.edtPhone);
dialog.setView(signup_layout);
dialog.setPositiveButton("SIGN UP", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
dialogInterface.dismiss();
if (TextUtils.isEmpty(edtEmail.getText().toString())) {
Snackbar.make(rootLayout, "Please enter email address", Snackbar.LENGTH_SHORT).show();
return;
}
if (TextUtils.isEmpty(edtPhone.getText().toString())) {
Snackbar.make(rootLayout, "Please enter phone number", Snackbar.LENGTH_SHORT).show();
return;
}
if (TextUtils.isEmpty(edtPassword.getText().toString())) {
Snackbar.make(rootLayout, "Please enter password", Snackbar.LENGTH_SHORT).show();
return;
}
if (edtPassword.getText().toString().length() < 6) {
Snackbar.make(rootLayout, "Password too short!!!", Snackbar.LENGTH_SHORT).show();
return;
}
auth.createUserWithEmailAndPassword(edtEmail.getText().toString(), edtPassword.getText().toString())
.addOnSuccessListener(new OnSuccessListener<AuthResult>() {
@Override
public void onSuccess(AuthResult authResult) {
User user = new User();
user.setEmail(edtEmail.getText().toString());
user.setPassword(edtPassword.getText().toString());
user.setPhone(edtPhone.getText().toString());
user.setName(edtName.getText().toString());
users.child(Objects.requireNonNull(FirebaseAuth.getInstance().getCurrentUser()).getUid()).setValue(user)
.addOnSuccessListener(new OnSuccessListener<Void>() {
@Override
public void onSuccess(Void aVoid) {
Snackbar.make(rootLayout, "Register Successfully", Snackbar.LENGTH_SHORT)
.show();
}
})
.addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception e) {
Snackbar.make(rootLayout, "Failed" + e.getMessage(), Snackbar.LENGTH_SHORT)
.show();
}
})
.addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception e) {
Snackbar.make(rootLayout, "Failed" + e.getMessage(), Snackbar.LENGTH_SHORT)
.show();
}
});
}
});
}
});
dialog.setNegativeButton("CANCEL", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
dialogInterface.dismiss();
}
});
dialog.show();
}
private void showSignInDialog() {
final AlertDialog.Builder dialog = new AlertDialog.Builder(this);
dialog.setTitle("SIGN IN");
dialog.setMessage("Please use email to sign in");
LayoutInflater inflater = LayoutInflater.from(this);
View signin_layout = inflater.inflate(R.layout.layout_signin, null);
final MaterialEditText edtEmail = signin_layout.findViewById(R.id.edtEmail);
final MaterialEditText edtPassword = signin_layout.findViewById(R.id.edtPassword);
dialog.setView(signin_layout);
dialog.setPositiveButton("SIGN IN", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
dialogInterface.dismiss();
if (TextUtils.isEmpty(edtEmail.getText().toString())) {
Snackbar.make(rootLayout, "Please enter email address", Snackbar.LENGTH_SHORT).show();
return;
}
if (TextUtils.isEmpty(edtPassword.getText().toString())) {
Snackbar.make(rootLayout, "Please enter password", Snackbar.LENGTH_SHORT).show();
return;
}
if (edtPassword.getText().toString().length() < 6) {
Snackbar.make(rootLayout, "Password too short!!!", Snackbar.LENGTH_SHORT).show();
return;
}
auth.signInWithEmailAndPassword(edtEmail.getText().toString(), edtPassword.getText().toString())
.addOnSuccessListener(new OnSuccessListener<AuthResult>() {
public User user;
@Override
public void onSuccess(AuthResult authResult) {
startActivity(new Intent(MainActivity.this, Home.class));
Common.currentUser = user;
finish();
}
})
.addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception e) {
Snackbar.make(rootLayout, "Failed" + e.getMessage(), Snackbar.LENGTH_SHORT).show();
}
});
}
});
dialog.setNegativeButton("CANCEL", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
dialogInterface.dismiss();
}
});
dialog.show();
}
}
menuviewholder.java文件
package com.example.sharma.digimenu.ViewHolder;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;
import com.example.sharma.digimenu.Interface.ItemClickListener;
import com.example.sharma.digimenu.R;
public class MenuViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{
public TextView txtMenuName;
public ImageView imageView;
private ItemClickListener itemClickListener;
public MenuViewHolder(View itemView) {
super(itemView);
txtMenuName = itemView.findViewById(R.id.menu_name);
imageView = itemView.findViewById(R.id.menu_image);
}
public void setItemClickListener(ItemClickListener itemClickListener){
this.itemClickListener = itemClickListener;
}
@Override
public void onClick (View view) {
itemClickListener.onClick(view,getAdapterPosition(),false);
}
}
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
android:background="@drawable/background"
tools:openDrawer="start">
<include
layout="@layout/app_bar_home"
android:layout_width="match_parent"
android:layout_height="match_parent"
/>
<android.support.design.widget.NavigationView
android:id="@+id/nav_view"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="start"
android:fitsSystemWindows="true"
android:background="@android:color/background_dark"
app:itemTextColor="@android:color/background_light"
app:itemIconTint="@android:color/background_light"
app:headerLayout="@layout/nav_header_home"
app:menu="@menu/activity_home_drawer" />
</android.support.v4.widget.DrawerLayout>
06-24 22:06:08.063 466-466/com.example.sharma.digimenu W/DynamiteModule: Local module descriptor class for com.google.firebase.auth not found.
06-24 22:06:08.063 466-466/com.example.sharma.digimenu W/BiChannelGoogleApi: [FirebaseAuth: ] getGoogleApiForMethod() returned Gms: com.google.firebase.auth.api.internal.zzal@1da9cec4
06-24 22:06:08.069 466-1271/com.example.sharma.digimenu W/DynamiteModule: Local module descriptor class for com.google.firebase.auth not found.
06-24 22:06:08.074 466-1271/com.example.sharma.digimenu I/FirebaseAuth: [FirebaseAuth:] Loading module via FirebaseOptions.
[FirebaseAuth:] Preparing to create service connection to gms implementation
06-24 22:06:10.323 466-585/com.example.sharma.digimenu D/FirebaseAuth: Notifying id token listeners about user ( ythvbsqhYURD3NrN5LlNtXZsDMC3 ).
06-24 22:06:10.324 466-466/com.example.sharma.digimenu D/FirebaseApp: Notifying auth state listeners.
06-24 22:06:10.325 466-466/com.example.sharma.digimenu D/FirebaseApp: Notified 1 auth state listeners.
06-24 22:06:10.328 466-466/com.example.sharma.digimenu I/Timeline: Timeline: Activity_launch_request id:com.example.sharma.digimenu time:25840099
06-24 22:06:10.337 466-521/com.example.sharma.digimenu V/FA: Recording user engagement, ms: 25151
06-24 22:06:10.338 466-521/com.example.sharma.digimenu V/FA: Connecting to remote service
06-24 22:06:10.340 466-521/com.example.sharma.digimenu V/FA: Activity paused, time: 72826503
06-24 22:06:10.344 466-521/com.example.sharma.digimenu D/FA: Logging event (FE): user_engagement(_e), Bundle[{firebase_event_origin(_o)=auto, engagement_time_msec(_et)=25151, firebase_screen_class(_sc)=MainActivity, firebase_screen_id(_si)=-2677346009036919789}]
06-24 22:06:10.347 466-466/com.example.sharma.digimenu V/FA: onActivityCreated
06-24 22:06:10.372 466-521/com.example.sharma.digimenu V/FA: Connection attempt already in progress
06-24 22:06:10.474 466-521/com.example.sharma.digimenu D/FA: Logging event (FE): screen_view(_vs), Bundle[{firebase_event_origin(_o)=auto, firebase_previous_class(_pc)=MainActivity, firebase_previous_id(_pi)=-2677346009036919789, firebase_screen_class(_sc)=Home, firebase_screen_id(_si)=-2677346009036919788}]
06-24 22:06:10.489 466-521/com.example.sharma.digimenu V/FA: Connection attempt already in progress
Connection attempt already in progress
Activity resumed, time: 72826637
06-24 22:06:10.544 466-521/com.example.sharma.digimenu D/FA: Connected to remote service
06-24 22:06:10.544 466-521/com.example.sharma.digimenu V/FA: Processing queued up service tasks: 4
06-24 22:06:10.617 466-466/com.example.sharma.digimenu I/Timeline: Timeline: Activity_idle id: android.os.BinderProxy@d97ab3e time:25840388
06-24 22:06:15.575 466-521/com.example.sharma.digimenu V/FA: Inactivity, disconnecting from the service
共有1个答案
楮庆
你需要一个适配器。官方的firebase库没有任何适配器类，但有一个非常有用的库称为FirebaseUI。
https://github.com/firebase/firebaseui-Android
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