如何使用Firebase在Android中更改用户密码？

在许多应用程序中，我们都有使用电子邮件和密码登录的功能。有时，我们忘记了密码，大多数情况下会重设密码。在这里，我们将实现相同的功能，以使用Firebase身份验证重置密码。您可以参考以下文章，在Android中使用Firebase进行用户身份验证。下面提供了一个示例视频，以使您对我们在本文中将要做的事情有个大概的了解。注意，我们将使用Java语言实现该项目。

分步实施

步骤1：使用UI部件

转到activity_login.xml文件，并参考以下代码。以下是activity_login.xml文件的代码。

步骤2：使用LoginActivity。 Java文件

转到LoginActivity。 Java文件并参考以下代码。下面是LoginActivity的代码。 Java文件

Java

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;
  
import android.app.AlertDialog;
import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.text.InputType;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;
  
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.OnFailureListener;
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 memail;
    private EditText mpass;
    private FirebaseAuth mAuth;
    private Toolbar mtoolbar;
    private Button login;
    TextView forgetpass;
    public ProgressDialog loginprogress;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);
        
        mtoolbar=(Toolbar)findViewById(R.id.login_toolbar);
        setSupportActionBar(mtoolbar);
        
        mAuth = FirebaseAuth.getInstance();
        getSupportActionBar().setTitle("Login");
        
        forgetpass=findViewById(R.id.forgetpass);
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        loginprogress=new ProgressDialog(this);
        memail=(EditText)findViewById(R.id.logemail);
        mpass=(EditText)findViewById(R.id.logpass);
        
        // click on forget password text 
        forgetpass.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                showRecoverPasswordDialog();
            }
        });
        
        login=(Button)findViewById(R.id.logbut);
        login.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String email=memail.getText().toString();
                String password =mpass.getText().toString();
                if(!TextUtils.isEmpty(email)||!TextUtils.isEmpty(password)){
                    loginprogress.setTitle("Logging In");
                    loginprogress.setMessage("Please Wait ");
                    loginprogress.setCanceledOnTouchOutside(false);
                    loginprogress.show();
                    loginUser(email,password);
                }
            }
        });
    }
    
    ProgressDialog loadingBar;
    
    private void showRecoverPasswordDialog() {
        AlertDialog.Builder builder=new AlertDialog.Builder(this);
        builder.setTitle("Recover Password");
        LinearLayout linearLayout=new LinearLayout(this);
        final EditText emailet= new EditText(this);
          
        // write the email using which you registered
        emailet.setText("Email");
        emailet.setMinEms(16);
        emailet.setInputType(InputType.TYPE_TEXT_VARIATION_EMAIL_ADDRESS);
        linearLayout.addView(emailet);
        linearLayout.setPadding(10,10,10,10);
        builder.setView(linearLayout);
          
        // Click on Recover and a email will be sent to your registered email id
        builder.setPositiveButton("Recover", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                String emaill=emailet.getText().toString().trim();
                beginRecovery(emaill);
            }
        });
        
        builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                dialog.dismiss();
            }
        });
        builder.create().show();
    }
    
    private void beginRecovery(String emaill) {
        loadingBar=new ProgressDialog(this);
        loadingBar.setMessage("Sending Email....");
        loadingBar.setCanceledOnTouchOutside(false);
        loadingBar.show();
          
        // calling sendPasswordResetEmail
        // open your email and write the new 
        // password and then you can login
        mAuth.sendPasswordResetEmail(emaill).addOnCompleteListener(new OnCompleteListener() {
            @Override
            public void onComplete(@NonNull Task task) {
                loadingBar.dismiss();
                if(task.isSuccessful())
                { 
                    // if isSuccessful then done messgae will be shown 
                    // and you can change the password
                    Toast.makeText(LoginActivity.this,"Done sent",Toast.LENGTH_LONG).show();
                }
                else {
                    Toast.makeText(LoginActivity.this,"Error Occured",Toast.LENGTH_LONG).show();
                }
            }
        }).addOnFailureListener(new OnFailureListener() {
            @Override
            public void onFailure(@NonNull Exception e) {
                loadingBar.dismiss();
                Toast.makeText(LoginActivity.this,"Error Failed",Toast.LENGTH_LONG).show();
            }
        });
    }
    public void loginUser(String email,String password){
        mAuth.signInWithEmailAndPassword(email,password).addOnCompleteListener(new OnCompleteListener() {
            @Override
            public void onComplete(@NonNull Task task) {
                if(task.isSuccessful()){
                    loginprogress.dismiss();
                    Intent mainIntent = new Intent(LoginActivity.this,MainActivity.class);
                    mainIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK|Intent.FLAG_ACTIVITY_CLEAR_TASK);
                    startActivity(mainIntent);
                    finish();
                } else {
                    loginprogress.hide();
                    Toast.makeText(LoginActivity.this,"Cannot Sign In..Plaese Try Again",Toast.LENGTH_LONG);
                }
            }
        });
    }
}

输出：

GitHub链接： https : //github.com/Anni1123/LoginDemo