问题描述
我正在尝试使用在我的项目中此 Firebase身份验证，我收到一个错误，我不知道该怎么解决以及导致错误的原因:
I am trying to use this Firebase authentication in my project, and I am getting an error that i can't figure out how to solve, and what causes it:
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout 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/toolbar"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context="info.androidhive.firebase.LoginActivity">
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@color/colorPrimary"
android:gravity="center"
android:orientation="vertical"
android:padding="@dimen/activity_horizontal_margin">
<ImageView
android:layout_width="@dimen/logo_w_h"
android:layout_height="@dimen/logo_w_h"
android:layout_gravity="center_horizontal"
android:layout_marginBottom="30dp"
android:src="@mipmap/ic_launcher" />
<android.support.design.widget.TextInputLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<EditText
android:id="@+id/email"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="10dp"
android:hint="@string/hint_email"
android:inputType="textEmailAddress"
android:textColor="@android:color/white"
android:textColorHint="@android:color/white" />
</android.support.design.widget.TextInputLayout>
<android.support.design.widget.TextInputLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<EditText
android:id="@+id/password"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="10dp"
android:hint="@string/hint_password"
android:inputType="textPassword"
android:textColor="@android:color/white"
android:textColorHint="@android:color/white" />
</android.support.design.widget.TextInputLayout>
<!-- Login Button -->
<Button
android:id="@+id/btn_login"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginTop="20dip"
android:background="@color/colorAccent"
android:text="@string/btn_login"
android:textColor="@android:color/black" />
<Button
android:id="@+id/btn_reset_password"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginTop="20dip"
android:background="@null"
android:text="@string/btn_forgot_password"
android:textAllCaps="false"
android:textColor="@color/colorAccent" />
<!-- Link to Login Screen -->
<Button
android:id="@+id/btn_signup"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginTop="20dip"
android:background="@null"
android:text="@string/btn_link_to_register"
android:textAllCaps="false"
android:textColor="@color/white"
android:textSize="15dp" />
</LinearLayout>
<ProgressBar
android:id="@+id/progressBar"
android:layout_width="30dp"
android:layout_height="30dp"
android:layout_gravity="center|bottom"
android:layout_marginBottom="20dp"
android:visibility="gone" />
package com.esmad.pdm.friendlymanager;
import android.content.Intent;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.Toolbar;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ProgressBar;
import android.widget.Toast;
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.auth.AuthResult;
import com.google.firebase.auth.FirebaseAuth;
public class LoginActivity extends AppCompatActivity {
private EditText inputEmail, inputPassword;
private FirebaseAuth auth;
private ProgressBar progressBar;
private Button btnSignup, btnLogin, btnReset;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
auth = FirebaseAuth.getInstance();
if (auth.getCurrentUser() != null) {
startActivity(new Intent(LoginActivity.this, MainActivity.class));
finish();
}
setContentView(R.layout.activity_login);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
inputEmail = (EditText) findViewById(R.id.email);
inputPassword = (EditText) findViewById(R.id.password);
progressBar = (ProgressBar) findViewById(R.id.progressBar);
btnSignup = (Button) findViewById(R.id.btn_signup);
btnLogin = (Button) findViewById(R.id.btn_login);
btnReset = (Button) findViewById(R.id.btn_reset_password);
//Get Firebase auth instance
auth = FirebaseAuth.getInstance();
btnSignup.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
startActivity(new Intent(LoginActivity.this, SignupActivity.class));
}
});
btnReset.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
startActivity(new Intent(LoginActivity.this, ResetPasswordActivity.class));
}
});
btnLogin.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String email = inputEmail.getText().toString();
final String password = inputPassword.getText().toString();
if (TextUtils.isEmpty(email)) {
Toast.makeText(getApplicationContext(), "Enter email address!", Toast.LENGTH_SHORT).show();
return;
}
if (TextUtils.isEmpty(password)) {
Toast.makeText(getApplicationContext(), "Enter password!", Toast.LENGTH_SHORT).show();
return;
}
progressBar.setVisibility(View.VISIBLE);
//authenticate user
auth.signInWithEmailAndPassword(email, password)
.addOnCompleteListener(LoginActivity.this, new OnCompleteListener<AuthResult>() {
@Override
public void onComplete(@NonNull Task<AuthResult> task) {
// If sign in fails, display a message to the user. If sign in succeeds
// the auth state listener will be notified and logic to handle the
// signed in user can be handled in the listener.
progressBar.setVisibility(View.GONE);
if (!task.isSuccessful()) {
// there was an error
if (password.length() < 6) {
inputPassword.setError(getString(R.string.minimum_password));
} else {
Toast.makeText(LoginActivity.this, getString(R.string.auth_failed), Toast.LENGTH_LONG).show();
}
} else {
Intent intent = new Intent(LoginActivity.this, MainActivity.class);
startActivity(intent);
finish();
}
}
});
}
});
}
}
为什么一直出现此错误，我正在使用ConstraintLayouts来构建此应用程序，我缺少了什么?
Why I keep getting this error, I'm using ConstraintLayouts to build this application, what am I missing?
推荐答案
您的CoordinatorLayout的ID为工具栏"
Your CoordinatorLayout has the id 'toolbar'
<android.support.design.widget.CoordinatorLayout
..
android:id="@+id/toolbar"
..>
但是在Java中，您将其强制转换为工具栏对象
But in Java you cast it to a Toolbar object
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
这引发异常，因为与id R.id.toolbar 关联的View不是工具栏.
This throws the exception because the View associated with the id R.id.toolbar is not a Toolbar.
要解决此问题，请从您的Java代码中删除以上两行，因为实际上布局中没有工具栏.
您可能还应该将CoordinatorLayout的ID更改为更具描述性的名称，例如"@ + id/coordinator"
To fix this, remove the above two lines from your Java code, since you do not actually have a Toolbar in your layout.
You should probably also change the id for the CoordinatorLayout to something more descriptive such as "@+id/coordinator"
如果我查看正在重新创建的示例，则那里没有工具栏.老实说，对于登录页面而言，这没有任何意义.但是，如果要添加它，可以将其添加到布局中.将其放置为顶部LinearLayout的第一个子代:
If I look at the example you are recreating, there is no Toolbar there.And honestly for a login page it wouldn't make the most sense. However if you want to add it you could add this to your layout. Place it as the first child of the top LinearLayout:
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:popupTheme="@style/AppTheme.PopupOverlay" />
但是，如果您对处理布局等并不十分有信心，我强烈建议您阅读更多文档，并尝试使用更简单的示例来熟悉该平台.
一个不错的起点是在这里: https://developer.android. com/guide/topics/ui/declaring-layout.html
But if you are not really confident with handling layouts and such, I would highly advice to read some more documentations and try simpler examples to get famillar with the platform.
A good place to start is here: https://developer.android.com/guide/topics/ui/declaring-layout.html
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