android - 浮动按钮和导航抽屉 Kotlin 导致应用程序崩溃
问题描述
我的应用程序有问题。我用 YT 教程中的动画制作了一个浮动按钮。当我添加这个按钮时，我的应用程序无法启动和崩溃。我在 content_main.xml 中制作了这些按钮，并且我正在使用绑定。当我在另一个没有抽屉的项目中这样做时，一切都正常工作。有谁知道出了什么问题？
package com.example.carplanner
import android.os.Bundle
import android.view.Menu
import android.view.MenuItem
import android.widget.Toast
import com.google.android.material.floatingactionbutton.FloatingActionButton
import com.google.android.material.snackbar.Snackbar
import com.google.android.material.navigation.NavigationView
import androidx.navigation.findNavController
import androidx.navigation.ui.AppBarConfiguration
import androidx.navigation.ui.navigateUp
import androidx.navigation.ui.setupActionBarWithNavController
import androidx.navigation.ui.setupWithNavController
import androidx.drawerlayout.widget.DrawerLayout
import androidx.appcompat.app.AppCompatActivity
import androidx.appcompat.widget.Toolbar
import android.view.View
import android.content.Intent
import android.os.PersistableBundle
import android.view.animation.Animation
import android.view.animation.AnimationUtils
import com.example.carplanner.databinding.ContentMainBinding
class MainActivity : AppCompatActivity() {
private lateinit var appBarConfiguration: AppBarConfiguration
private lateinit var binding: ContentMainBinding
private val rotateOpen: Animation by lazy {
AnimationUtils.loadAnimation(
this,
R.anim.rotate_open_anim
)
}
private val rotateClose: Animation by lazy {
AnimationUtils.loadAnimation(
this,
R.anim.rotate_close_anim
)
}
private val fromBottom: Animation by lazy {
AnimationUtils.loadAnimation(
this,
R.anim.from_bottom_anim
)
}
private val toBottom: Animation by lazy {
AnimationUtils.loadAnimation(
this,
R.anim.to_bottom_anim
)
}
private var clicked = false
override fun onCreate(savedInstanceState: Bundle?, persistentState: PersistableBundle?) {
super.onCreate(savedInstanceState,persistentState)
return super.onCreate(savedInstanceState, persistentState)
}
private fun onAddButtonClicked() {
setVisibility(clicked)
setAnimation(clicked)
setClickable(clicked)
clicked = !clicked
}
private fun setVisibility(clicked: Boolean) {
if (!clicked){
binding.fuelBtn.visibility = View.VISIBLE
binding.repairBtn.visibility = View.VISIBLE
binding.ptBtn.visibility = View.VISIBLE
binding.expensensBtn.visibility = View.VISIBLE
binding.ocBtn.visibility = View.VISIBLE
}else{
binding.fuelBtn.visibility = View.INVISIBLE
binding.repairBtn.visibility = View.INVISIBLE
binding.ptBtn.visibility = View.INVISIBLE
binding.expensensBtn.visibility = View.INVISIBLE
binding.ocBtn.visibility = View.INVISIBLE
}
}
private fun setAnimation(clicked: Boolean) {
if (!clicked)
{
binding.fuelBtn.startAnimation(fromBottom)
binding.repairBtn.startAnimation(fromBottom)
binding.expensensBtn.startAnimation(fromBottom)
binding.ocBtn.startAnimation(fromBottom)
binding.ptBtn.startAnimation(fromBottom)
binding.addBtn.startAnimation(rotateOpen)
}else{
binding.fuelBtn.startAnimation(toBottom)
binding.repairBtn.startAnimation(toBottom)
binding.expensensBtn.startAnimation(toBottom)
binding.ocBtn.startAnimation(toBottom)
binding.ptBtn.startAnimation(toBottom)
binding.addBtn.startAnimation(rotateClose)
}
}
private fun setClickable(clicked: Boolean) {
if (!clicked) {
binding.fuelBtn.isClickable = true
binding.ptBtn.isClickable = true
binding.ocBtn.isClickable = true
binding.expensensBtn.isClickable = true
binding.repairBtn.isClickable = true
} else {
binding.fuelBtn.isClickable = false
binding.ptBtn.isClickable = false
binding.ocBtn.isClickable = false
binding.expensensBtn.isClickable = false
binding.repairBtn.isClickable = false
}
}
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
binding = ContentMainBinding.inflate((layoutInflater))
setContentView(binding.root)
binding.addBtn.setOnClickListener {
onAddButtonClicked()
}
binding.fuelBtn.setOnClickListener {
Toast.makeText(this, "Dodaj tankowanie", Toast.LENGTH_SHORT).show()
}
binding.repairBtn.setOnClickListener {
Toast.makeText(this, "Dodaj naprawę", Toast.LENGTH_SHORT).show()
}
binding.expensensBtn.setOnClickListener {
Toast.makeText(this, "Dodaj wydatki", Toast.LENGTH_SHORT).show()
}
binding.ocBtn.setOnClickListener {
Toast.makeText(this, "Dodaj Ubezpieczenie", Toast.LENGTH_SHORT).show()
}
binding.ptBtn.setOnClickListener {
Toast.makeText(this, "Dodaj przegląd techniczny", Toast.LENGTH_SHORT).show()
}
val toolbar: Toolbar = findViewById(R.id.toolbar)
setSupportActionBar(toolbar)
val drawerLayout: DrawerLayout = findViewById(R.id.drawer_layout)
val navView: NavigationView = findViewById(R.id.nav_view)
val navController = findNavController(R.id.nav_host_fragment)
appBarConfiguration = AppBarConfiguration(setOf(
R.id.nav_home,
R.id.nav_paliwo,
R.id.nav_naprawa,
R.id.nav_wydatki,
R.id.nav_oc,
R.id.nav_pt), drawerLayout)
setupActionBarWithNavController(navController!!, appBarConfiguration!!)
navView.setupWithNavController(navController!!)
}
override fun onSupportNavigateUp(): Boolean {
val navController = findNavController(R.id.nav_host_fragment)
return navController.navigateUp(appBarConfiguration!!) || super.onSupportNavigateUp()
}
override fun onCreateOptionsMenu(menu: Menu): Boolean {
// Inflate the menu; this adds items to the action bar if it is present.
menuInflater.inflate(R.menu.main, menu)
return true
}
override fun onOptionsItemSelected(item: MenuItem): Boolean {
val id = item.itemId
if (id == R.id.btn_settings) {
val intent = Intent(
this, SettingsActivity ::class.java)
startActivity (intent)
}else{
if (id == R.id.btn_about){
val intent = Intent(
this, About ::class.java)
startActivity (intent)
}
}
return super.onOptionsItemSelected(item)
}
}
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:showIn="@layout/app_bar_main">
<fragment
android:id="@+id/nav_host_fragment"
android:name="androidx.navigation.fragment.NavHostFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:defaultNavHost="true"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:navGraph="@navigation/mobile_navigation" />
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="@+id/add_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="24dp"
android:layout_marginBottom="16dp"
android:backgroundTint="@color/purple_500"
android:clickable="true"
android:focusable="true"
android:tint="@color/white"
app:backgroundTint="#FFFFFF"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:rippleColor="#FFFFFF"
app:srcCompat="@drawable/ic_add" />
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="@+id/fuel_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="16dp"
android:backgroundTint="#1565C0"
android:clickable="true"
android:focusable="true"
android:visibility="invisible"
android:tint="@android:color/white"
app:layout_constraintBottom_toTopOf="@+id/add_btn"
app:layout_constraintEnd_toEndOf="@+id/add_btn"
app:srcCompat="@drawable/ic_paliwo" />
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="@+id/repair_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="16dp"
android:backgroundTint="#1565C0"
android:clickable="true"
android:focusable="true"
android:visibility="invisible"
android:tint="@android:color/white"
app:layout_constraintBottom_toTopOf="@+id/fuel_btn"
app:layout_constraintEnd_toEndOf="@+id/fuel_btn"
app:srcCompat="@drawable/ic_naprawa"
/>
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="@+id/expensens_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="16dp"
android:backgroundTint="#1565C0"
android:clickable="true"
android:focusable="true"
android:visibility="invisible"
android:tint="@android:color/white"
app:layout_constraintBottom_toTopOf="@+id/repair_btn"
app:layout_constraintEnd_toEndOf="@+id/repair_btn"
app:srcCompat="@drawable/ic_wydatki" />
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="@+id/oc_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="16dp"
android:backgroundTint="#1565C0"
android:clickable="true"
android:focusable="true"
android:tint="@android:color/white"
android:visibility="invisible"
app:layout_constraintBottom_toTopOf="@+id/expensens_btn"
app:layout_constraintEnd_toEndOf="@+id/expensens_btn"
app:srcCompat="@drawable/ic_oc" />
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="@+id/pt_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="16dp"
android:backgroundTint="#1565C0"
android:clickable="true"
android:focusable="true"
android:visibility="invisible"
android:tint="@android:color/white"
app:layout_constraintBottom_toTopOf="@+id/oc_btn"
app:layout_constraintEnd_toEndOf="@+id/oc_btn"
app:srcCompat="@drawable/ic_pt" />
</androidx.constraintlayout.widget.ConstraintLayout>
和错误：
Caused by: android.view.InflateException: Binary XML file line #10 in com.example.carplanner:layout/content_main: Binary XML file line #10 in com.example.carplanner:layout/content_main: Error inflating class fragment
Caused by: android.view.InflateException: Binary XML file line #10 in com.example.carplanner:layout/content_main: Error inflating class fragment
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.Context androidx.fragment.app.FragmentHostCallback.getContext()' on a null object reference
at androidx.fragment.app.FragmentManager$3.instantiate(FragmentManager.java:390)
at androidx.fragment.app.FragmentLayoutInflaterFactory.onCreateView(FragmentLayoutInflaterFactory.java:97)
at androidx.fragment.app.FragmentController.onCreateView(FragmentController.java:135)
at androidx.fragment.app.FragmentActivity.dispatchFragmentsOnCreateView(FragmentActivity.java:356)
at androidx.fragment.app.FragmentActivity.onCreateView(FragmentActivity.java:335)
at android.view.LayoutInflater.tryCreateView(LayoutInflater.java:1067)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:995)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:959)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:1121)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:1082)
at android.view.LayoutInflater.inflate(LayoutInflater.java:680)
at android.view.LayoutInflater.inflate(LayoutInflater.java:532)
at com.example.carplanner.databinding.ContentMainBinding.inflate(ContentMainBinding.java:66)
at com.example.carplanner.databinding.ContentMainBinding.inflate(ContentMainBinding.java:60)
at com.example.carplanner.MainActivity.onCreate(MainActivity.kt:58)
at android.app.Activity.performCreate(Activity.java:8000)
at android.app.Activity.performCreate(Activity.java:7984)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1309)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3422)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3601)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:85)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2066)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:223)
at android.app.ActivityThread.main(ActivityThread.java:7656)
at java.lang.reflect.Method.invoke(Native Method)
2021-01-16 22:40:07.525 26936-26936/com.example.carplanner E/AndroidRuntime: at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)
2021-01-16 22:40:07.582 26936-26936/com.example.carplanner I/Process: Sending signal. PID: 26936 SIG: 9
解决方案
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