0
我是java編碼和Android Studio的新手，所以請耐心等待，並感謝您提供的任何幫助。用戶在註冊活動頁面中註冊之後，我希望他們能夠按登錄頁面中的登錄按鈕，然後讓應用程序進入配置文件活動頁面。但是，輸入用戶名和密碼並按登錄頁面中的登錄按鈕後，應用程序崩潰。這裏是一組代碼，這第一組是「LoginPageActivity.java」活動中的登錄頁面代碼。登錄頁面不會打開配置文件活動
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;
}
}
}
這裏被稱爲 「ProfileActivity.java」 的姿態的活動
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清單代碼。我已經嘗試了許多不同的變體，基於過去的研究和以前的問題，使用相同的logcat錯誤來聲明此清單中的ProfileActivity類。
<?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>
這裏是logcat的錯誤
12月12日至2日：04：56.008 2644年至2644年/ com.example.xxxx.safetyxxxxxxx E/AndroidRuntime：致命異常：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)
最後在需要的情況下，這裏是被稱爲「activity_login_page.xml」的登錄頁面佈局代碼
<?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>
'android.content.ActivityNotFoundException：無法找到顯式活動類{com.example.xxxx.safetyxxxxxxx/com.example.xxxx.safetyxxxxxxx.ProfileActivity};你有沒有在你的AndroidManifest.xml文件中聲明這個活動？ –
請在把它放在這裏之前研究你的問題。很多資源可用於在堆棧溢出中找到此問題的解決方案。 – Mahesh