汉堡图标无法在Android Studio中工作

Question

嗨，所以我从Github获得了一个代码，并对其进行了自定义。该应用程序没有任何导航菜单，这就是我尝试自己添加它的原因(我以前从未制作过应用程序，所以请对我好一点(。所以我试着在Youtube上学习如何添加导航菜单的教程。我成功地建造了一个，但当我尝试运行它时，汉堡图标似乎什么都没做。我可能在主活动中搞砸了，但我似乎找不到错误。请给我建议。非常感谢！应用程序的代码如下。

package com.adityap.flashy_createflashcards
import android.app.Activity
import android.content.Intent
import android.graphics.Canvas
import android.graphics.Color
import android.graphics.drawable.ColorDrawable
import android.graphics.drawable.Drawable
import android.os.Bundle
import android.view.MenuItem
import android.view.animation.GridLayoutAnimationController
import androidx.appcompat.app.ActionBarDrawerToggle
import androidx.recyclerview.widget.GridLayoutManager
import com.adityap.flashy_createflashcards.R
import kotlinx.android.synthetic.main.activity_main.*
import android.util.Log
import android.widget.Toast
import android.view.View
import androidx.appcompat.app.AppCompatActivity
import androidx.appcompat.widget.Toolbar
import androidx.core.content.ContextCompat
import androidx.recyclerview.widget.ItemTouchHelper
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView
import com.adityap.flashy_createflashcards.adapters.DeckRecyclerListAdapter
import com.adityap.flashy_createflashcards.database.DatabaseHelper
import com.adityap.flashy_createflashcards.database.DatabaseHelperFactory
import com.adityap.flashy_createflashcards.models.DeckModel
import com.google.android.material.floatingactionbutton.FloatingActionButton
class MainActivity : AppCompatActivity() {
lateinit var actionBarDrawerToggle: ActionBarDrawerToggle
lateinit var databaseHelper: DatabaseHelper
lateinit var recyclerView: RecyclerView
private lateinit var viewAdapter: RecyclerView.Adapter<*>
private lateinit var viewManager: RecyclerView.LayoutManager

private var swipeBackgroundColor: ColorDrawable = ColorDrawable(Color.parseColor("#d11a2a"))
private lateinit var deleteIcon: Drawable
lateinit var mDeckModelList: MutableList<DeckModel>
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
databaseHelper = DatabaseHelperFactory.getDBHelper(this)
val fab = findViewById<View>(R.id.fab) as FloatingActionButton
setUpDrawerLayout()

fab.setOnClickListener {
startActivityForResult(Intent(this, CreateDeckActivity::class.java), 123)
}
fun onOptionsItemSelected(item: MenuItem): Boolean {
if (actionBarDrawerToggle.onOptionsItemSelected(item)) {
return true
}
return super.onOptionsItemSelected(item)
}
mDeckModelList = mutableListOf()
mDeckModelList.addAll(databaseHelper.readDeck())
viewManager = LinearLayoutManager(this)
viewAdapter = DeckRecyclerListAdapter(this, mDeckModelList)
deleteIcon = ContextCompat.getDrawable(this, R.drawable.ic_baseline_delete_24)!!
recyclerView = findViewById<RecyclerView>(R.id.recyclerView).apply {
setHasFixedSize(true)
layoutManager = viewManager
adapter = viewAdapter
}

/*        mDeckListAdapter = DeckListAdapter(this, mDeckModelList!!)
listview.adapter = mDeckListAdapter*/
/*        listview.onItemClickListener = OnItemClickListener { _, _, position, _ ->
val intent = Intent(this, ReviewDeckActivity::class.java)
intent.putExtra("Deck", mDeckModelList!![position])
startActivity(intent)
}*/
val itemTouchHelperCallback = object : ItemTouchHelper.SimpleCallback(0, ItemTouchHelper.LEFT or ItemTouchHelper.RIGHT) {
override fun onMove(recyclerView: RecyclerView, viewHolder: RecyclerView.ViewHolder, target: RecyclerView.ViewHolder): Boolean {
return false
}
override fun onSwiped(viewHolder: RecyclerView.ViewHolder, postiion: Int) {
(viewAdapter as DeckRecyclerListAdapter).removeItem(viewHolder as DeckRecyclerListAdapter.CardHolder)
}
override fun onChildDraw(
c: Canvas,
recyclerView: RecyclerView,
viewHolder: RecyclerView.ViewHolder,
dX: Float,
dY: Float,
actionState: Int,
isCurrentlyActive: Boolean) {

val itemView = viewHolder.itemView
val iconMargin = (itemView.height - deleteIcon.intrinsicHeight) /2
if(dX>0){
swipeBackgroundColor.setBounds(itemView.left,itemView.top,dX.toInt(),itemView.bottom)
deleteIcon.setBounds(itemView.left + iconMargin,
itemView.top + iconMargin,
itemView.left + iconMargin + deleteIcon.intrinsicWidth,
itemView.bottom - iconMargin )
}else {
swipeBackgroundColor.setBounds(itemView.right + dX.toInt(),itemView.top, itemView.right,itemView.bottom)
deleteIcon.setBounds(itemView.right-iconMargin-deleteIcon.intrinsicWidth,
itemView.top + iconMargin,
itemView.right-iconMargin,
itemView.bottom - iconMargin)
}
swipeBackgroundColor.draw(c)
c.save()
if(dX > 0 )
c.clipRect(itemView.left,itemView.top, dX.toInt(), itemView.bottom)
else
c.clipRect(itemView.right+dX.toInt(),itemView.top,itemView.right, itemView.bottom)
deleteIcon.draw(c)
c.restore()
super.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive)
}
}
val itemTouchHelper = ItemTouchHelper(itemTouchHelperCallback)
itemTouchHelper.attachToRecyclerView(recyclerView)

}
fun setUpDrawerLayout() {
setSupportActionBar(main_toolbar)
actionBarDrawerToggle = ActionBarDrawerToggle(this, mainDrawer, R.string.app_name, R.string.app_name)
actionBarDrawerToggle.syncState()
navigationView.setNavigationItemSelectedListener {
val intent = Intent(this, ProfileActivity::class.java)
startActivity(intent)
mainDrawer.closeDrawers()
true
}
}

override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
super.onActivityResult(requestCode, resultCode, data)
if (resultCode == Activity.RESULT_OK && requestCode == 123) {
mDeckModelList.clear()
mDeckModelList.addAll(databaseHelper.readDeck())
viewAdapter.notifyDataSetChanged()
}
}
}

这是我的activity_main.xml

<?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/mainDrawer"
android:background="@drawable/gradientbackground"
tools:context=".MainActivity">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/gradientbackground"
tools:context="com.adityap.flashy_createflashcards.MainActivity">
<com.google.android.material.appbar.AppBarLayout
android:id="@+id/appBarLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
<com.google.android.material.appbar.MaterialToolbar
android:id="@+id/main_toolbar"
style="@style/Widget.MaterialComponents.Toolbar.Primary"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/colorPrimaryButtonBg"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:navigationIcon="@drawable/ic_hamburger"
app:popupTheme="@style/AppTheme.PopupOverlay"
app:title="@string/app_name" />
</com.google.android.material.appbar.AppBarLayout>

<androidx.recyclerview.widget.RecyclerView
android:id="@+id/recyclerView"
android:layout_width="415dp"
android:layout_height="732dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/appBarLayout"
app:layout_constraintVertical_bias="0.0" />
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="@+id/fab"
android:layout_width="55dp"
android:layout_height="55dp"
android:layout_marginStart="730dp"
android:layout_marginLeft="730dp"
android:contentDescription="TODO"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toStartOf="@+id/recyclerView"
app:layout_constraintStart_toStartOf="parent"
app:srcCompat="@drawable/ic_add"
app:useCompatPadding="true" />

<ImageView
android:id="@+id/imageView4"
android:layout_width="match_parent"
android:layout_height="500dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:srcCompat="@drawable/ic_undraw_lost_online_re_upmy" />

</androidx.constraintlayout.widget.ConstraintLayout>
<com.google.android.material.navigation.NavigationView
android:id="@+id/navigationView"
android:layout_gravity="start"
android:layout_width="wrap_content"
app:headerLayout="@layout/drawer_header"
app:menu="@menu/drawer_menu"
android:layout_height="match_parent">
</com.google.android.material.navigation.NavigationView>
</androidx.drawerlayout.widget.DrawerLayout>

这是我的drawer_menu.xml

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:android="http://schemas.android.com/apk/res/android">

<item android:title="Profile" />
<item android:title="Follow us" />
<item android:title="Rate us" />
</menu>

请帮忙，我刚接触安卓工作室和kotlin，非常感谢。

Answer 1

导航菜单应该有这样的菜单项：

<item
android:id="@+id/home"
android:checked="true"
android:icon="@drawable/ic_home"
android:title="@string/home" />

并在主活动代码中执行此操作：

protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

Toolbar toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);

NavigationView navView = findViewById(R.id.nav_view);
drawer = findViewById(R.id.drawer);

toggle = new ActionBarDrawerToggle(this, drawer, toolbar, R.string.open, R.string.close);

drawer.addDrawerListener(toggle);

navView.setNavigationItemSelectedListener(this);

}

然后添加此回调以监听菜单项点击：

@Override
public boolean onNavigationItemSelected(@NonNull MenuItem menuItem) {
}

最后一部分非常重要：

@Override
protected void onPostCreate(Bundle state) {
super.onPostCreate(state);
toggle.syncState();
}

除此之外，SO职位也很有用。