我正在 Android Studio 中开发移动 Java 应用程序。我创建了几个活动、一个在它们之间导航的菜单和一个位于每个页面顶部的工具栏。然而，我在从卡车活动导航（尝试导航，更正确）时遇到了问题，因为事实证明我完全无法从中导航，尽管从任何其他活动移动时都不会出现问题。 我是移动开发的新手，非常感谢您的帮助和关注！ 这是 LorriesActivity.java 的代码（我打赌问题就在这里）
package com.example.myapplication;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.view.GravityCompat;
import androidx.drawerlayout.widget.DrawerLayout;
import androidx.recyclerview.widget.RecyclerView;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.Toast;
import com.google.android.material.floatingactionbutton.FloatingActionButton;
public class LorriesActivity extends AppCompatActivity {
DrawerLayout drawerLayout;
ImageView menu;
LinearLayout timetable, messages, orders, lorries, drivers, clients, partners, company;
LinearLayout logout;
RecyclerView recyclerView;
FloatingActionButton add_lorry_button;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_lorries);
drawerLayout=findViewById(R.id.drawerLayout);
menu=findViewById(R.id.menu);
timetable=findViewById(R.id.timetable);
messages=findViewById(R.id.messages);
orders=findViewById(R.id.orders);
lorries=findViewById(R.id.lorries);
drivers=findViewById(R.id.drivers);
clients=findViewById(R.id.clients);
partners=findViewById(R.id.partners);
company=findViewById(R.id.company);
logout=findViewById(R.id.logout);
recyclerView = findViewById(R.id.recyclerView);
add_lorry_button = findViewById(R.id.add_lorry_button);
add_lorry_button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
}
});
menu.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
openDrawer(drawerLayout);
}
});
timetable.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
redirectActivity(LorriesActivity.this, MainActivity.class);
}
});
messages.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
redirectActivity(LorriesActivity.this, MessagesActivity.class);
}
});
orders.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
redirectActivity(LorriesActivity.this, OrdersActivity.class);
}
});
lorries.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) { recreate(); }
});
drivers.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
redirectActivity(LorriesActivity.this, DriversActivity.class);
}
});
clients.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
redirectActivity(LorriesActivity.this, ClientsActivity.class);
}
});
partners.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
redirectActivity(LorriesActivity.this, PartnersActivity.class);
}
});
company.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
redirectActivity(LorriesActivity.this, CompanyActivity.class);
}
});
logout.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(LorriesActivity.this,"Ви вийшли з системи",Toast.LENGTH_SHORT).show();
}
});
}
public static void openDrawer(DrawerLayout drawerLayout){
drawerLayout.openDrawer(GravityCompat.START);
}
public static void closeDrawer(DrawerLayout drawerLayout){
if (drawerLayout.isDrawerOpen(GravityCompat.START)) {
drawerLayout.closeDrawer(GravityCompat.START);
}
}
public static void redirectActivity(Activity activity, Class secondActivity){
Intent intent = new Intent(activity,secondActivity);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
activity.startActivity(intent);
activity.finish();
}
@Override
protected void onPause() {
super.onPause();
closeDrawer(drawerLayout);
}
}
这是activity_lorries.xml的代码
<?xml version="1.0" encoding="utf-8"?>
<androidx.drawerlayout.widget.DrawerLayout
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"
android:id="@+id/drawerLayout"
tools:context=".LorriesActivity">
<ScrollView
android:layout_width="match_parent"
android:orientation="vertical"
android:padding="1dp"
android:layout_height="match_parent"
android:fillViewport="true">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<include
layout="@layout/toolbar"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="Вантажівки"
android:textStyle="bold"
android:layout_marginTop="50dp"
android:textSize="30sp" />
<androidx.recyclerview.widget.RecyclerView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/recyclerView"
android:layout_marginTop="20dp"
android:layout_marginLeft="15dp"/>
</LinearLayout>
</ScrollView>
<RelativeLayout
android:layout_width="300dp"
android:layout_height="match_parent"
android:layout_gravity="start"
android:background="@color/white">
<include
layout="@layout/nav_drawer"/>
</RelativeLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="@+id/add_lorry_button"
android:layout_width="310dp"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignParentBottom="true"
android:layout_marginStart="28dp"
android:layout_marginTop="28dp"
android:layout_marginEnd="28dp"
android:layout_marginRight="28dp"
android:layout_marginBottom="28dp"
android:clickable="true"
android:focusable="true"
app:srcCompat="@drawable/add" />
</RelativeLayout>
</androidx.drawerlayout.widget.DrawerLayout>
我修好了！我需要做的就是将带有导航抽屉的相对布局移动到布局文件的最末尾。所以现在可以了。不管怎样，我正在自学 Android 开发，所以我会重视你对这段代码中其他内容的建议。