登录页面不会打开配置文件活动

Z时代
2024-01-10
分类：问答

我是java编码和Android Studio的新手，所以请耐心等待，并感谢您提供的任何帮助。用户在注册活动页面中注册之后，我希望他们能够按登录页面中的登录按钮，然后让应用程序进入配置文件活动页面。但是，输入用户名和密码并按登录页面中的登录按钮后，应用程序崩溃。这里是一组代码，这第一组是“LoginPageActivity.java”活动中的登录页面代码。登录页面不会打开配置文件活动

package com.example.xxxx.safetyxxxxxxx; 
import android.content.Intent; 
import android.support.annotation.NonNull; 
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.util.Patterns; 
import android.view.View; 
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 LoginPageActivity extends AppCompatActivity implements View.OnClickListener{ 
    FirebaseAuth mAuth; 
    EditText editTextEmail, editTextPassword; 
    ProgressBar progressBar; 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_login_page); 
     mAuth = FirebaseAuth.getInstance(); 
     editTextEmail = findViewById(R.id.editTextEmail); 
     editTextPassword= (EditText) findViewById(R.id.editTextPassword); 
     progressBar = (ProgressBar) findViewById(R.id.progressbar); 
    findViewById(R.id.textViewSignUp).setOnClickListener(this); 
    findViewById(R.id.buttonLogin).setOnClickListener(this); 
} 
private void userLogin(){ 
    String email = editTextEmail.getText().toString().trim(); 
    String password = editTextPassword.getText().toString().trim(); 
    if(email.isEmpty()){ 
     editTextEmail.setError("Email is required"); 
     editTextEmail.requestFocus(); 
     return; 
    } 
    if(!Patterns.EMAIL_ADDRESS.matcher(email).matches()){ 
     editTextEmail.setError("Please enter a valid email"); 
     editTextEmail.requestFocus(); 
     return; 
    } 
    if(password.isEmpty()){ 
     editTextPassword.setError("Password is required"); 
     editTextPassword.requestFocus(); 
     return; 
    } 
    if(password.length()<6){ 
     editTextPassword.setError("Minimum length of password should be 6"); 
     editTextPassword.requestFocus(); 
     return; 
    } 
    progressBar.setVisibility(View.VISIBLE); 
     mAuth.signInWithEmailAndPassword(email, password).addOnCompleteListener(new OnCompleteListener<AuthResult>() { 
      @Override 
      public void onComplete(@NonNull Task<AuthResult> task) { 
       progressBar.setVisibility(View.GONE); 
       if (task.isSuccessful()) { 
        Intent intent = new Intent(LoginPageActivity.this, ProfileActivity.class); 
        startActivity(intent); 
        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); 
        finish(); 
       } else { 
        Toast.makeText(getApplicationContext(), task.getException().getMessage(), Toast.LENGTH_SHORT).show(); 
       } 
      } 
     }); 
} 
    @Override 
    public void onClick(View view) { 
      switch (view.getId()) { 
       case R.id.textViewSignUp: 
        startActivity(new Intent(this, SignUpActivity.class)); 
        break; 
       case R.id.buttonLogin: 
        userLogin(); 
        break; 
      } 
     } 
    }

这里被称为 “ProfileActivity.java” 的姿态的活动

package com.example.xxxx.safetyxxxxxxx; 
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
public class ProfileActivity extends AppCompatActivity { 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_profile); 
    } 
}

下面是Android清单代码。我已经尝试了许多不同的变体，基于过去的研究和以前的问题，使用相同的logcat错误来声明此清单中的ProfileActivity类。

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
    package="com.example.xxxx.safetyxxxxxxx"> 
    <application 
     android:name=".Database" 
     android:allowBackup="true" 
     android:icon="@mipmap/ic_launcher" 
     android:label="@string/app_name" 
     android:roundIcon="@mipmap/ic_launcher_round" 
     android:supportsRtl="true" 
     android:theme="@style/AppTheme"> 
     <activity android:name=".MainActivity"> 
      <intent-filter> 
       <action android:name="android.intent.action.MAIN" /> 
       <category android:name="android.intent.category.LAUNCHER" /> 
      </intent-filter> 
     </activity> 
     <activity android:name=".LoginPageActivity" 
      android:label="@string/app_name"/> 
     <activity android:name=".Main2Activity" /> 
     <activity 
      android:name=".SignUpActivity" 
      android:label="@string/app_name"> 
    </activity> 
     <activity android:name=".ProfileActivity" 
     android:label="@string/app_name"/> 
    </application> 
</manifest>

这里是logcat的错误

12月12日至2日：04：56.008 2644年至2644年/ com.example.xxxx.safetyxxxxxxx E/AndroidRuntime：致命异常：主

Process: com.example.xxxx.safetyxxxxxxx, PID: 2644 android.content.ActivityNotFoundException: Unable to find explicit activity class {com.example.xxxx.safetyxxxxxxx/com.example.xxxx.safetyxxxxxxx.ProfileActivity}; have you declared this activity in your AndroidManifest.xml? at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1933) at android.app.Instrumentation.execStartActivity(Instrumentation.java:1616) at android.app.Activity.startActivityForResult(Activity.java:4488) at android.support.v4.app.BaseFragmentActivityApi16.startActivityForResult(BaseFragmentActivityApi16.java:54) at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:67) at android.app.Activity.startActivityForResult(Activity.java:4446) at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:720) at android.app.Activity.startActivity(Activity.java:4807) at android.app.Activity.startActivity(Activity.java:4775) at com.example.xxxx.safetyxxxxxxx.LoginPageActivity$1.onComplete(LoginPageActivity.java:79) at com.google.android.gms.tasks.zzf.run(Unknown Source:23) at android.os.Handler.handleCallback(Handler.java:790) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:164) at android.app.ActivityThread.main(ActivityThread.java:6494) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)

最后在需要的情况下，这里是被称为“activity_login_page.xml”的登录页面布局代码

<?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=".LoginPageActivity"> 
    <TextView 
     android:id="@+id/textView2" 
     android:layout_width="0dp" 
     android:layout_height="53dp" 
     android:layout_marginBottom="8dp" 
     android:layout_marginEnd="8dp" 
     android:layout_marginStart="8dp" 
     android:layout_marginTop="8dp" 
     android:text="Hi, Welcome to Safety xxxxxxx Please Login or Signup" 
     android:textAlignment="center" 
     android:textColor="@android:color/holo_green_dark" 
     android:textSize="20sp" 
     app:layout_constraintBottom_toTopOf="@+id/buttonLogin" 
     app:layout_constraintEnd_toEndOf="parent" 
     app:layout_constraintHorizontal_bias="0.0" 
     app:layout_constraintStart_toStartOf="parent" 
     app:layout_constraintTop_toTopOf="parent" 
     app:layout_constraintVertical_bias="0.66"></TextView> 
    <Button 
     android:id="@+id/buttonLogin" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_marginBottom="8dp" 
     android:layout_marginEnd="8dp" 
     android:layout_marginStart="8dp" 
     android:layout_marginTop="8dp" 
     android:text="Login" 
     app:layout_constraintBottom_toBottomOf="parent" 
     app:layout_constraintEnd_toEndOf="parent" 
     app:layout_constraintStart_toStartOf="parent" 
     app:layout_constraintTop_toTopOf="parent" 
     app:layout_constraintVertical_bias="0.87" /> 
    <EditText 
     android:id="@+id/editTextEmail" 
     android:layout_width="346dp" 
     android:layout_height="50dp" 
     android:layout_marginBottom="8dp" 
     android:layout_marginEnd="8dp" 
     android:layout_marginStart="8dp" 
     android:layout_marginTop="8dp" 
     android:ems="10" 
     android:hint="email" 
     android:inputType="textEmailAddress" 
     app:layout_constraintBottom_toTopOf="@+id/editTextPassword" 
     app:layout_constraintEnd_toEndOf="parent" 
     app:layout_constraintStart_toStartOf="parent" 
     app:layout_constraintTop_toTopOf="@+id/textView2" 
     app:layout_constraintVertical_bias="0.95" /> 
    <EditText 
     android:id="@+id/editTextPassword" 
     android:layout_width="346dp" 
     android:layout_height="50dp" 
     android:layout_marginBottom="8dp" 
     android:layout_marginEnd="8dp" 
     android:layout_marginStart="8dp" 
     android:layout_marginTop="8dp" 
     android:ems="10" 
     android:inputType="textPassword" 
     android:hint=" Password" 
     app:layout_constraintBottom_toTopOf="@+id/buttonLogin" 
     app:layout_constraintEnd_toEndOf="parent" 
     app:layout_constraintStart_toStartOf="parent" 
     app:layout_constraintTop_toBottomOf="@+id/textView2" 
     app:layout_constraintVertical_bias="0.87" /> 
    <ImageView 
     android:id="@+id/imageView2" 
     android:layout_width="219dp" 
     android:layout_height="229dp" 
     android:layout_marginBottom="8dp" 
     android:layout_marginEnd="8dp" 
     android:layout_marginStart="8dp" 
     android:layout_marginTop="8dp" 
     app:layout_constraintBottom_toTopOf="@+id/editTextEmail" 
     app:layout_constraintEnd_toEndOf="parent" 
     app:layout_constraintHorizontal_bias="0.503" 
     app:layout_constraintStart_toStartOf="parent" 
     app:layout_constraintTop_toTopOf="parent" 
     app:layout_constraintVertical_bias="0.233" 
     app:srcCompat="@drawable/safetyxxx" /> 
    <TextView 
     android:id="@+id/textViewSignUp" 
     android:layout_width="345dp" 
     android:layout_height="35dp" 
     android:layout_marginBottom="8dp" 
     android:layout_marginEnd="8dp" 
     android:layout_marginStart="8dp" 
     android:layout_marginTop="8dp" 
     android:text="Do Not Have An Account? Click Here" 
     android:textAlignment="center" 
     android:textColor="@android:color/holo_green_dark" 
     android:textSize="20sp" 
     app:layout_constraintBottom_toBottomOf="parent" 
     app:layout_constraintEnd_toEndOf="parent" 
     app:layout_constraintStart_toStartOf="parent" 
     app:layout_constraintTop_toBottomOf="@+id/buttonLogin" /> 
    <android.support.v4.widget.ContentLoadingProgressBar 
     android:id="@+id/progressbar" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_centerHorizontal="true" 
     android:layout_centerVertical="true" 
     android:visibility="gone"/> 
</android.support.constraint.ConstraintLayout>

回答：

经过多次尝试，我需要做的只是按重建项目按钮。它在那之后完美运作。

感谢所有试图提供帮助的人。

回答：

它被清除arly在致命消息中表示：android.content.ActivityNotFoundException：无法找到显式活动类{com.example.xxxx.safetyxxxxxxx/com.example.xxxx.safetyxxxxxxx.ProfileActivity};你有没有在你的AndroidManifest.xml中声明这个活动？

所以，你在清单文件中乱七八糟：请尝试从活动的定义中移除包名：例如像“activity android：name =”com.example.xxxx.safetyxxxxxxx.LoginPageActivity“之类的叮咬应该更改为“activity android：name =”。LoginPageActivity“

此致敬礼！

回答：

您可以试试这个镜头。

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
    package="com.example.xxxx.safetyxxxxxxx"> 
    <application 
     android:name=".Database" 
     android:allowBackup="true" 
     android:icon="@mipmap/ic_launcher" 
     android:label="@string/app_name" 
     android:roundIcon="@mipmap/ic_launcher_round" 
     android:supportsRtl="true" 
     android:theme="@style/AppTheme"> 
     <activity android:name=".MainActivity"> 
      <intent-filter> 
       <action android:name="android.intent.action.MAIN" /> 
       <category android:name="android.intent.category.LAUNCHER" /> 
      </intent-filter> 
     </activity> 
     <activity android:name=".LoginPageActivity" 
      android:label="@string/app_name"> 
      </activity> 
     <activity android:name=".Main2Activity"> 
     </activity> 
     <activity 
      android:name=".SignUpActivity" 
      android:label="@string/app_name"> 
    </activity> 
     <activity android:name=".ProfileActivity" 
     android:label="@string/app_name"> 
     </activity> 
</application> 
</manifest>