Question

我正在处理的应用提示用户在打开应用时使用Firebase登录。如果应用程序完全关闭，则在打开时，用户将进入登录屏幕。但是，我工作的公司的许多工作人员都没有关闭应用程序，他们只是将它发送到后台。这是一个问题，因为如果我删除他们的帐户，它不会立即将其删除;它只会在关闭应用程序后将它们踢出去。

为了解决这个问题，我基本上对主屏幕进行了编码，以便每次页面重新加载 - 无论是到达前台，从不同的活动返回主页，还是再次启动应用程序 - 它都会在后台登录用户，然后重新登录，然后检查用户帐户的有效性。

这样做的最终目标是，如果用户仍然拥有有效的登录信息，他们将不会受到影响，但如果他们的登录信息无效，即使他们没有完全关闭应用，他们也会被锁定。

但是，即使已经输入了有效的登录信息，目前应用程序也会将用户踢回登录界面。

主要活动代码（登录屏幕）：

package com.priceelectric.xriley.priceprefab;

import android.app.Application;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.net.Uri;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
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;
import com.google.firebase.auth.FirebaseUser;

public class MainActivity extends AppCompatActivity {

    private FirebaseAuth.AuthStateListener mAuthListener;

    private FirebaseAuth mAuth;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        final SharedPreferences prefs = getSharedPreferences("myDataStorage", MODE_PRIVATE);
        final SharedPreferences.Editor mEditor = prefs.edit();

        mAuth = FirebaseAuth.getInstance();

        FirebaseAuth.getInstance().signOut();

        mAuthListener = new FirebaseAuth.AuthStateListener() {
            @Override
            public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
                FirebaseUser user = firebaseAuth.getCurrentUser();
                if(user != null){
                    Log.d("loginTag", "onAuthStateChanged:signed_in:" + user.getUid());

                    Context context = getApplicationContext();

                    final Intent returnHome = new Intent();
                    returnHome.setClass(context, Home_Screen.class);
                    startActivity(returnHome);



                }
                else{
                    Log.d("loginTag", "onAuthStateChanged:signed_out");
                }

            }
        };

        final EditText usernameTextBox = (EditText) findViewById(R.id.usernameTextBox);
        final EditText passwordTextBox = (EditText) findViewById(R.id.passwordTextBox);

        usernameTextBox.setText(prefs.getString("username", ""));
        passwordTextBox.setText(prefs.getString("password", ""));

        final Button login = (Button) findViewById(R.id.loginButton);
        assert login != null;

        login.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                mEditor.putString("username", usernameTextBox.getText().toString());
                mEditor.putString("password", passwordTextBox.getText().toString());
                mEditor.commit();

                prefs.getInt("thing", 0);

                final String email = usernameTextBox.getText().toString();
                final String password = passwordTextBox.getText().toString();
//                FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();
//                final String uid = user.getUid();
//                final SharedPreferences prefs = getSharedPreferences("myDataStorage", MODE_PRIVATE);
//                final SharedPreferences.Editor mEditor = prefs.edit();
                mAuth.signInWithEmailAndPassword(email, password)
                        .addOnCompleteListener(MainActivity.this, new OnCompleteListener<AuthResult>() {
                            @Override
                            public void onComplete(@NonNull Task<AuthResult> task) {

                                Log.d("loginTag", "signInWithEmail:onComplete:" + task.isSuccessful());

                                if(!task.isSuccessful()){
                                    Log.w("loginTag", "signInWithEmail:failed", task.getException());
                                }
                            }
                        });

            }
        });

    }

    @Override
    public void onStart(){
        super.onStart();
        mAuth.addAuthStateListener(mAuthListener);
    }

    @Override
    public void onStop(){
        super.onStop();
        if(mAuthListener != null){
            mAuth.removeAuthStateListener(mAuthListener);
        }
    }

    @Override
    public void onBackPressed(){
        Context context = getApplicationContext();
        CharSequence notificationText = "You need to log in.";
        int duration = Toast.LENGTH_LONG;

        Toast.makeText(context, notificationText, duration).show();
    }

}

主屏幕代码：

package com.priceelectric.xriley.priceprefab;

import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.KeyEvent;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;

public class Home_Screen extends AppCompatActivity {

    private FirebaseAuth mAuth;

    FirebaseUser user;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_home__screen);

        final Button paperworkButton = (Button) findViewById(R.id.paperworkButton);

        mAuth = FirebaseAuth.getInstance();

        final TextView versionLabel = (TextView) findViewById(R.id.versionLabel);

        SharedPreferences prefs = getSharedPreferences("myDataStorage", MODE_PRIVATE);

        FirebaseAuth.getInstance().signOut();

        mAuth.signInWithEmailAndPassword(prefs.getString("username", ""), prefs.getString("password", ""));

        user = FirebaseAuth.getInstance().getCurrentUser();

        if(user != null){
            //all good
        }
        else{
            Context context = getApplicationContext();
            CharSequence notificationText = "You need to log in.";
            int duration = Toast.LENGTH_LONG;

            Toast.makeText(context, notificationText, duration).show();

            final Intent loginScreen = new Intent();
            loginScreen.setClass(this, MainActivity.class);
            startActivity(loginScreen);
        }

        if(prefs.getString("yourName", "").equals("")){
            final Intent settingsScreen = new Intent();
            settingsScreen.setClass(this, Settings_Screen.class);
            startActivity(settingsScreen);
        }
    }

    public void buttonOnClick(View view){

        SharedPreferences prefs = getSharedPreferences("myDataStorage", MODE_PRIVATE);

        switch(view.getId()){
            case R.id.prefabOrderButton:
                SharedPreferences.Editor mEditor = prefs.edit();
                mEditor.putInt("itemNumberCounter", 0);
                mEditor.commit();

                final Intent prefabScreen = new Intent();
                prefabScreen.setClass(this, Prefab_Order.class);
                startActivity(prefabScreen);
                break;
            case R.id.safetyFormButton:
                final Intent safetyReportScreen = new Intent();
                safetyReportScreen.setClass(this, Safety_Report.class);
                startActivity(safetyReportScreen);
                break;
            case R.id.resiPanelButton:
                final Intent resiPanelScreen = new Intent();
                resiPanelScreen.setClass(this, Resi_Panel_Builder.class);
                startActivity(resiPanelScreen);
                break;
            case R.id.onlineResourcesButton:
                final Intent onlineResourcesScreen = new Intent();
                onlineResourcesScreen.setClass(this, Online_Resources.class);
                startActivity(onlineResourcesScreen);
                break;
            case R.id.settingsButton:
                final Intent settingsScreen = new Intent();
                settingsScreen.setClass(this, Settings_Screen.class);
                startActivity(settingsScreen);
                break;
            case R.id.paperworkButton:
                final Intent paperworkScreen = new Intent();
                paperworkScreen.setClass(this, Paperwork_Orders.class);
                startActivity(paperworkScreen);
                break;
        }
    }

    @Override
    public void onBackPressed(){
        //do nothing
    }
}

建议将不胜感激。

Answer 1

在namespace ConsoleApplicationGrbage { class Program { static void Main(string[] args) { var container = new UnityContainer(); var list = new Dictionary<string, string>(); list.Add("NameA", "YourClass"); var thisAssemebly = Assembly.GetExecutingAssembly(); var exT = thisAssemebly.ExportedTypes; //register types only that are in the dictionary foreach (var item in list) { var typeClass = exT.First(x => x.Name == item.Value); var ivmt = Type.GetType("ConsoleApplicationGrbage.IYourInterface"); // --> Map Interface to ImplementationType container.RegisterType(ivmt, typeClass, item.Key); // or directly: container.RegisterType(typeof(IYourInterface), typeClass, item.Key); } var impl = container.Resolve<IYourInterface>("NameA"); } } public interface IYourInterface { } public class YourClass: IYourInterface { } }活动中，如果您向<script type="text/javascript"> getReadXmlFile(); function getReadXmlFile(){ alert("recherche d fichier"); $.ajax({ type: "GET", url: "http://www.velib.paris/service/stationdetails/paris/901", dataType: "xml", success: parseXml }); alert("obtention du fichier"); } function parseXml(xml){ alert('debut du parse'); var up=$(xml).find("updated").text(); alert(up); } </script>添加完成侦听器，我认为您会获得更好的结果，类似于Home_Screen中的内容。

使用现有代码：

signInWithEmailAndPassword()

您在登录完成之前请求当前用户，因此MainActivity为空。

添加完成侦听器并移动代码以生成Toast并在那里启动mAuth.signInWithEmailAndPassword(prefs.getString("username", ""), prefs.getString("password", "")); user = FirebaseAuth.getInstance().getCurrentUser(); if(user != null){ //all good }，在user为false时运行它。

此外，您可能希望尝试使用FirebaseUser.reload()，而不是使用注销/登录来测试用户帐户是否仍然有效。文档表明如果当前用户帐户被禁用或删除，它将返回失败结果。

使用完成侦听器获取MainActivity状态：

task.isSuccessful()

android中的延迟操作，直到上一个操作完成

1 个答案: