[英]Android app crashes with a flashing screen
我是Android开发的新手,正在学习使用Firebase进行身份验证,我创建了三个活动MainActivity,LoginActivity和FeedActivity。 发生的事情是我在装有android 7.1.1的小米redmi手机上加载了该应用程序,它打开并看起来可以正常工作,但是我尝试使用新帐户进行注册,而不是将我带到FeedActivity,整个屏幕以白色闪烁,一切停止工作,停止它的唯一方法是杀死应用程序并返回主屏幕。
主要活动
package com.example.ahmed.myapplication;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.text.TextUtils;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ProgressBar;
import android.widget.TextView;
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 MainActivity extends AppCompatActivity implements View.OnClickListener {
private Button buttonRegister;
private EditText editTextEmail;
private EditText editTextPassword;
private TextView textViewLogin;
private ProgressDialog progressDialog;
private FirebaseAuth firebaseAuth;
@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(getApplicationContext(), FeedActivity.class));
}
progressDialog = new ProgressDialog(this);
buttonRegister = (Button) findViewById(R.id.buttonRegister);
editTextEmail = (EditText) findViewById(R.id.editTextEmail);
editTextPassword = (EditText) findViewById(R.id.editTextPassword);
textViewLogin = (TextView) findViewById(R.id.textViewLogin);
buttonRegister.setOnClickListener(this);
textViewLogin.setOnClickListener(this);
}
private void registerUser() {
String email = editTextEmail.getText().toString().trim();
String password = editTextPassword.getText().toString().trim();
if (TextUtils.isEmpty(email)) {
//email is empty
Toast.makeText(this, "Opps! Please Enter Email", Toast.LENGTH_SHORT).show();
//stop the function
return;
}
if (TextUtils.isEmpty(password)) {
//password is empty
Toast.makeText(this, "Opps! Please Enter Password", Toast.LENGTH_SHORT).show();
//stop the function
return;
}
progressDialog.setMessage("Getting you in...");
progressDialog.show();
firebaseAuth.createUserWithEmailAndPassword(email,password)
.addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
@Override
public void onComplete(@NonNull Task<AuthResult> task) {
if (task.isSuccessful()) {
firebaseAuth = FirebaseAuth.getInstance();
finish();
startActivity(new Intent(getApplicationContext(), FeedActivity.class));
Toast.makeText(MainActivity.this, "Welcome, to My App.", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(MainActivity.this, "Opps, Something went wrong! Try Again!!", Toast.LENGTH_SHORT).show();
}
progressDialog.dismiss();
}
});
}
@Override
public void onClick(View view) {
if (view == buttonRegister) {
registerUser();
}
if (view == textViewLogin) {
startActivity(new Intent(this, LoginActivity.class));
}
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="16dp"
android:paddingTop="16dp"
android:paddingLeft="16dp"
android:paddingRight="16dp"
tools:context="com.example.ahmed.myapplication.MainActivity">
<LinearLayout
android:layout_centerVertical="true"
android:layout_centerHorizontal="true"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:text="Sign Up and Inspire!"
android:textAppearance="@style/TextAppearance.AppCompat.Large" />
<EditText
android:layout_margin="15dp"
android:inputType="textEmailAddress"
android:hint="Enter Your Email"
android:id="@+id/editTextEmail"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<EditText
android:layout_margin="15dp"
android:inputType="textPassword"
android:hint="Enter Your Password"
android:id="@+id/editTextPassword"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<Button
android:layout_margin="15dp"
android:id="@+id/buttonRegister"
android:text="Sign Up"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<TextView
android:textAlignment="center"
android:text="Already On signed up? Sign In Here"
android:id="@+id/textViewLogin"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>
</RelativeLayout>
登录活动
package com.example.ahmed.myapplication;
import android.app.ProgressDialog;
import android.content.Intent;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
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 implements View.OnClickListener {
private Button buttonLogin;
private EditText editTextEmail;
private EditText editTextPassword;
private TextView textViewSignup;
private FirebaseAuth firebaseAuth;
private ProgressDialog progressDialog;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
firebaseAuth = FirebaseAuth.getInstance();
if (firebaseAuth.getCurrentUser()!= null){
finish();
startActivity(new Intent(getApplicationContext(), FeedActivity.class));
}
editTextEmail = (EditText) findViewById(R.id.editTextEmail);
editTextPassword = (EditText) findViewById(R.id.editTextPassword);
buttonLogin = (Button) findViewById(R.id.buttonLogin);
textViewSignup = (TextView) findViewById(R.id.textViewSignup);
progressDialog = new ProgressDialog(this);
buttonLogin.setOnClickListener(this);
textViewSignup.setOnClickListener(this);
}
private void userLogin() {
String email = editTextEmail.getText().toString().trim();
String password = editTextPassword.getText().toString().trim();
if (TextUtils.isEmpty(email)) {
//email is empty
Toast.makeText(this, "Opps! Please Enter Email", Toast.LENGTH_SHORT).show();
//stop the function
return;
}
if (TextUtils.isEmpty(password)) {
//password is empty
Toast.makeText(this, "Opps! Please Enter Password", Toast.LENGTH_SHORT).show();
//stop the function
return;
}
progressDialog.setMessage("Finding Your Account...");
progressDialog.show();
firebaseAuth.signInWithEmailAndPassword(email,password)
.addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
@Override
public void onComplete(@NonNull Task<AuthResult> task) {
progressDialog.dismiss();
if (task.isSuccessful()){
finish();
startActivity(new Intent(getApplicationContext(), FeedActivity.class));
}
}
});
}
@Override
public void onClick(View view) {
if (view == buttonLogin){
userLogin();
}
if (view == textViewSignup){
finish();
startActivity(new Intent(this, MainActivity.class));
}
}
}
activity_login.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.ahmed.myapplication.LoginActivity">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:orientation="vertical"
tools:layout_editor_absoluteX="0dp"
tools:layout_editor_absoluteY="79dp">
<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:text="Welcome Back Buddy!"
android:textAppearance="@style/TextAppearance.AppCompat.Large" />
<EditText
android:id="@+id/editTextEmail"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="15dp"
android:hint="Enter Your Email"
android:inputType="textEmailAddress" />
<EditText
android:id="@+id/editTextPassword"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="15dp"
android:hint="Enter Your Password"
android:inputType="textPassword" />
<Button
android:id="@+id/buttonLogin"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="15dp"
android:text="Log In" />
<TextView
android:id="@+id/textViewSignup"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="New To My App? Sign Up Now"
android:textAlignment="center" />
</LinearLayout>
</android.support.constraint.ConstraintLayout>
FeedActivity
package com.example.ahmed.myapplication;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;
public class FeedActivity extends AppCompatActivity implements View.OnClickListener {
private FirebaseAuth firebaseAuth;
private TextView textViewUserEmail;
private Button buttonLogout;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_feed);
firebaseAuth = FirebaseAuth.getInstance();
if (firebaseAuth.getCurrentUser()!= null){
finish();
startActivity(new Intent(getApplicationContext(), LoginActivity.class));
}
FirebaseUser user = firebaseAuth.getCurrentUser();
textViewUserEmail = (TextView) findViewById(R.id.textViewUserEmail);
textViewUserEmail.setText("Welcome friend"+user.getEmail());
buttonLogout = (Button) findViewById(R.id.buttonLogout);
buttonLogout.setOnClickListener(this);
}
@Override
public void onClick(View view) {
if (view == buttonLogout){
firebaseAuth.signOut();
finish();
startActivity(new Intent(this, LoginActivity.class));
}
}
}
我在这里先向您的帮助表示感谢
activity_feed.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.ahmed.myapplication.FeedActivity">
<LinearLayout
android:layout_centerVertical="true"
android:layout_centerHorizontal="true"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="@+id/textViewUserEmail"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:text="Ander Agaya te!"
android:textAppearance="@style/TextAppearance.AppCompat.Large" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Sign Out"
android:id="@+id/buttonLogout"
android:layout_gravity="center_horizontal" />
</LinearLayout>
</android.support.constraint.ConstraintLayout>
更改此-:
if (task.isSuccessful()) {
firebaseAuth = FirebaseAuth.getInstance();
finish();
startActivity(new Intent(getApplicationContext(), FeedActivity.class));
Toast.makeText(MainActivity.this, "Welcome, to My App.", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(MainActivity.this, "Opps, Something went wrong! Try Again!!", Toast.LENGTH_SHORT).show();
}
至-:
if (task.isSuccessful()) {
firebaseAuth = FirebaseAuth.getInstance();
startActivity(new Intent(getApplicationContext(), FeedActivity.class));
finish();
Toast.makeText(MainActivity.this, "Welcome, to My App.", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(MainActivity.this, "Opps, Something went wrong! Try Again!!", Toast.LENGTH_SHORT).show();
}
在该行之后通话结束...
在FeedActivity.class中的if条件中进行更改
if (firebaseAuth.getCurrentUser()!= null){
finish();
startActivity(new Intent(getApplicationContext(), LoginActivity.class));
}
至
if (firebaseAuth.getCurrentUser()= null){
startActivity(new Intent(getApplicationContext(), LoginActivity.class));
finish();
}
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