Android 即使我的数据库几乎为空,执行Firebase查询也会花费很长时间
我正在用Firebase在android上开发一个应用程序 根据我的经验,我正在做的每一项任务,例如登录、使用OnDataChanged获取数据等,都会在巨大的延迟中完成,即使数据库几乎是空的。在调试代码时,我看到程序流一直在运行并“跳过”firebase侦听器,然后仅在程序达到更晚的状态后才执行它们。这导致了许多竞争条件,我通常试图通过在主线程上睡眠来解决这些问题,但这会使我的应用程序速度更慢,并且变得不稳定。举个例子,我在下面发布LoginActivity的代码,它使用一个UserLoginTask,我在其中调用Firebase的AuthWithPassword方法,一旦验证成功,我将调用OnDataChanged方法从数据库检索用户的数据,并将其存储在MyAppModel上,MyAppModel是一个单例模型。如果你能看一下,告诉我我做错了什么,我会很高兴的。谢谢Android 即使我的数据库几乎为空,执行Firebase查询也会花费很长时间,android,firebase,firebase-realtime-database,firebase-authentication,Android,Firebase,Firebase Realtime Database,Firebase Authentication,我正在用Firebase在android上开发一个应用程序 根据我的经验,我正在做的每一项任务,例如登录、使用OnDataChanged获取数据等,都会在巨大的延迟中完成,即使数据库几乎是空的。在调试代码时,我看到程序流一直在运行并“跳过”firebase侦听器,然后仅在程序达到更晚的状态后才执行它们。这导致了许多竞争条件,我通常试图通过在主线程上睡眠来解决这些问题,但这会使我的应用程序速度更慢,并且变得不稳定。举个例子,我在下面发布LoginActivity的代码,它使用一个UserLogin
package com.biu.ap2.mysitter;
import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.annotation.TargetApi;
import android.content.Intent;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Build;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.AppCompatActivity;
import android.text.TextUtils;
import android.util.Log;
import android.view.KeyEvent;
import android.view.View;
import android.view.inputmethod.EditorInfo;
import android.widget.AutoCompleteTextView;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import com.firebase.client.AuthData;
import com.firebase.client.DataSnapshot;
import com.firebase.client.Firebase;
import com.firebase.client.FirebaseError;
import com.firebase.client.ValueEventListener;
import com.google.android.gms.appindexing.Action;
import com.google.android.gms.appindexing.AppIndex;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.firebase.auth.AuthResult;
public class LoginActivity extends ActionBarActivity {
private static final String[] DUMMY_CREDENTIALS = new String[]{
"foo@example.com:hello", "bar@example.com:world", "a@a:a"
};
private UserLoginTask mAuthTask = null;
private AutoCompleteTextView mEmailView;
private EditText mPasswordView;
private View mProgressView;
private Button mRegisterView;
private View mLoginFormView;
myAppModel model;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
mEmailView = (AutoCompleteTextView) findViewById(R.id.email);
//populateAutoComplete();
mPasswordView = (EditText) findViewById(R.id.password);
mRegisterView = (Button) findViewById(R.id.register);
mRegisterView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent i = new Intent(LoginActivity.this, RegisterActivity.class);
LoginActivity.this.startActivity(i);
}
});
mPasswordView.setOnEditorActionListener(new TextView.OnEditorActionListener() {
@Override
public boolean onEditorAction(TextView textView, int id, KeyEvent keyEvent) {
if (id == R.id.login_btnLogin || id == EditorInfo.IME_NULL) {
attemptLogin();
return true;
}
return false;
}
});
Button mEmailSignInButton = (Button) findViewById(R.id.login_btnLogin);
mEmailSignInButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
attemptLogin();
}
});
mLoginFormView = findViewById(R.id.login_btnLogin);
mProgressView = findViewById(R.id.login_progress);
// ATTENTION: This was auto-generated to implement the App Indexing API.
// See https://g.co/AppIndexing/AndroidStudio for more information.
client = new GoogleApiClient.Builder(this).addApi(AppIndex.API).build();
}
private void attemptLogin() {
if (mAuthTask != null) {
return;
}
showProgress(true);
mAuthTask = new UserLoginTask(email, password);
mAuthTask.execute((Void) null);
}
}
private boolean isEmailValid(String email) {
//TODO: Replace this with your own logic
// return email.contains("@");
return true;
}
private boolean isPasswordValid(String password) {
//TODO: Replace this with your own logic
// return password.length() > 0;
return true;
}
@Override
public void onStart() {
super.onStart();
}
@Override
public void onStop() {
super.onStop();
}
public class UserLoginTask extends AsyncTask<Void, Void, Boolean> {
private final String mEmail;
private final String mPassword;
boolean flag = false;
UserLoginTask(String email, String password) {
mEmail = email;
mPassword = password;
}
public void setFlag(boolean flag) {
this.flag = flag;
}
public boolean getFlag() {
return this.flag;
}
@Override
protected Boolean doInBackground(Void... params) {
// TODO: attempt authentication against a network service.
Firebase.setAndroidContext(LoginActivity.this);
final Firebase ref = new Firebase("https://mybabysit.firebaseio.com/");
ref.authWithPassword(mEmail, mPassword, new Firebase.AuthResultHandler() {
@Override
public void onAuthenticated(AuthData authData) {
setFlag(true);
setUser(mEmail);
}
@Override
public void onAuthenticationError(FirebaseError firebaseError) {
Log.d("blah", firebaseError.getMessage());
System.out.println(firebaseError.getMessage());
}
});
try {
// Simulate network access.
Thread.sleep(8000);
} catch (InterruptedException e) {
return false;
}
if (getFlag())
return true;
return false;
}
@Override
protected void onPostExecute(final Boolean success) {
mAuthTask = null;
showProgress(false);
if (success) {
try {
// Simulate network access.
Thread.sleep(2000);
} catch (InterruptedException e) {
}
finish();
Intent i = new Intent(LoginActivity.this, IntroductionActivity.class);
i.putExtra("email", mEmail);
LoginActivity.this.startActivity(i);
} else {
mPasswordView.setError(getString(R.string.failed));
mPasswordView.requestFocus();
}
}
@Override
protected void onCancelled() {
mAuthTask = null;
showProgress(false);
}
}
/**
* Shows the progress UI and hides the login form.
*/
@TargetApi(Build.VERSION_CODES.HONEYCOMB_MR2)
private void showProgress(final boolean show) {
// On Honeycomb MR2 we have the ViewPropertyAnimator APIs, which allow
// for very easy animations. If available, use these APIs to fade-in
// the progress spinner.
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR2) {
int shortAnimTime = getResources().getInteger(android.R.integer.config_shortAnimTime);
mLoginFormView.setVisibility(show ? View.GONE : View.VISIBLE);
mLoginFormView.animate().setDuration(shortAnimTime).alpha(
show ? 0 : 1).setListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
mLoginFormView.setVisibility(show ? View.GONE : View.VISIBLE);
}
});
mProgressView.setVisibility(show ? View.VISIBLE : View.GONE);
mProgressView.animate().setDuration(shortAnimTime).alpha(
show ? 1 : 0).setListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
mProgressView.setVisibility(show ? View.VISIBLE : View.GONE);
}
});
} else {
// The ViewPropertyAnimator APIs are not available, so simply show
// and hide the relevant UI components.
mProgressView.setVisibility(show ? View.VISIBLE : View.GONE);
mLoginFormView.setVisibility(show ? View.GONE : View.VISIBLE);
}
}
public void setUser(final String email) {
model = model.getInstance();
final String mEmail=email;
Firebase ref = new Firebase("https://mybabysit.firebaseio.com");
Firebase userRef = ref.child("users");
// Firebase uidref=ref.child("uid").child(ref.getAuth().getUid());
// Attach an listener to read the data at our sitterPosts reference
userRef.addValueEventListener(new ValueEventListener() {
//ref.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot snapshot) {
for (DataSnapshot UserSnapshot : snapshot.getChildren()) {
User myUser = UserSnapshot.getValue(User.class);
if (mEmail.equals(myUser.getEmail()))
model.getInstance().setLoggedUser(myUser);
}
}
@Override
public void onCancelled(FirebaseError firebaseError) {
System.out.println("The read failed: " + firebaseError.getMessage());
}
});
}
}
//*/
package com.biu.ap2.mysitter;
导入android.animation.Animator;
导入android.animation.AnimatorListenerAdapter;
导入android.annotation.TargetApi;
导入android.content.Intent;
导入android.net.Uri;
导入android.os.AsyncTask;
导入android.os.Build;
导入android.os.Bundle;
导入android.support.v7.app.ActionBarActivity;
导入android.support.v7.app.AppActivity;
导入android.text.TextUtils;
导入android.util.Log;
导入android.view.KeyEvent;
导入android.view.view;
导入android.view.inputmethod.EditorInfo;
导入android.widget.AutoCompleteTextView;
导入android.widget.Button;
导入android.widget.EditText;
导入android.widget.TextView;
导入com.firebase.client.AuthData;
导入com.firebase.client.DataSnapshot;
导入com.firebase.client.firebase;
导入com.firebase.client.firebase错误;
导入com.firebase.client.ValueEventListener;
导入com.google.android.gms.appindexing.Action;
导入com.google.android.gms.AppIndex.AppIndex;
导入com.google.android.gms.common.api.GoogleAppClient;
导入com.google.firebase.auth.AuthResult;
公共类LoginActivity扩展了ActionBarActivity{
私有静态最终字符串[]伪\u凭据=新字符串[]{
"foo@example.com:你好“bar@example.com:世界“a@a:a“
};
private UserLoginTask mAuthTask=null;
私有AutoCompleteTextView mEmailView;
私有编辑文本mPasswordView;
私有视图mProgressView;
专用按钮mRegisterView;
私有视图mloginfo视图;
myAppModel模型;
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity\u登录);
mEmailView=(AutoCompleteTextView)findviewbyd(R.id.email);
//populateAutoComplete();
mPasswordView=(EditText)findViewById(R.id.password);
mRegisterView=(按钮)findviewbyd(R.id.register);
mRegisterView.setOnClickListener(新视图.OnClickListener(){
@凌驾
公共void onClick(视图v){
Intent i=新Intent(LoginActivity.this、RegisterActivity.class);
物流活动。这。startActivity(i);
}
});
mPasswordView.setOnEditorActionListener(新的TextView.OnEditorActionListener(){
@凌驾
公共布尔onEditorAction(TextView TextView、int id、KeyEvent KeyEvent){
if(id==R.id.login_btnLogin | | id==EditorInfo.IME_NULL){
尝试登录();
返回true;
}
返回false;
}
});
按钮mEmailSignInButton=(按钮)findViewById(R.id.login\u btnLogin);
mEmailSignInButton.setOnClickListener(新视图.OnClickListener(){
@凌驾
公共void onClick(视图){
尝试登录();
}
});
mLoginFormView=findviewbyd(R.id.login\u btnLogin);
mProgressView=findviewbyd(R.id.login\u progress);
//注意:这是自动生成的,用于实现应用程序索引API。
//看https://g.co/AppIndexing/AndroidStudio 了解更多信息。
client=new GoogleApiClient.Builder(this.addApi(AppIndex.API).build();
}
私有void attemptLogin(){
if(mAuthTask!=null){
返回;
}
显示进度(真实);
mAuthTask=新用户登录任务(电子邮件、密码);
mAuthTask.execute((Void)null);
}
}
私有布尔值isEmailValid(字符串电子邮件){
//TODO:用您自己的逻辑替换它
//返回电子邮件。包含(“@”);
返回true;
}
私有布尔值isPasswordValid(字符串密码){
//TODO:用您自己的逻辑替换它
//返回密码。长度()>0;
返回true;
}
@凌驾
public void onStart(){
super.onStart();
}
@凌驾
公共void onStop(){
super.onStop();
}
公共类UserLoginTask扩展异步任务{
私有最终字符串mEmail;
私有最终字符串mPassword;
布尔标志=假;
UserLoginTask(字符串电子邮件、字符串密码){
mEmail=电子邮件;
mPassword=密码;
}
公共无效设置标志(布尔标志){
this.flag=flag;
}
公共布尔getFlag(){
返回此.flag;
}
@凌驾
受保护的布尔doInBackground(Void…params){
//TODO:尝试对网络服务进行身份验证。
Firebase.setAndroidContext(LoginActivity.this);
最终火基参考=新火基(“https://mybabysit.firebaseio.com/");
ref.authWithPassword(mEmail、mPassword、new Firebase.AuthResultHandler(){
@凌驾
已验证(AuthData AuthData)上的公共无效