应用程序一直停止，logcat 错误无法理解
App keeps stopping, logcat error not understandable
请原谅我糟糕的问题起草技巧，请帮助我理解 logcat 中显示的错误，我认为这是我的应用停止的原因
我的主Activity文件
package com.syddhoo.bookapp.pack
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.MenuItem
import android.widget.FrameLayout
import androidx.appcompat.widget.Toolbar
import androidx.appcompat.app.ActionBarDrawerToggle
import androidx.core.view.GravityCompat
import androidx.drawerlayout.widget.DrawerLayout
import androidx.coordinatorlayout.widget.CoordinatorLayout
import com.google.android.material.navigation.NavigationView
import com.syddhoo.bookapp.*
class MainActivity : AppCompatActivity() {
lateinit var drawerLayout: DrawerLayout
lateinit var coordinatorLayout: CoordinatorLayout
lateinit var toolbar: Toolbar
lateinit var frameLayout: FrameLayout
lateinit var navigationView: NavigationView
var previousMenuItem : MenuItem? = null
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
drawerLayout = findViewById(R.id.drawerLayout)
coordinatorLayout = findViewById(R.id.coordinatorLayout)
toolbar = findViewById(R.id.toolbar)
frameLayout = findViewById(R.id.frameLayout)
navigationView = findViewById(R.id.navigationView)
setUpToolBar()
openDashboard()
val actionBarDrawerToggle = ActionBarDrawerToggle(this@MainActivity, drawerLayout,
R.string.open_drawer,
R.string.close_drawer
)
drawerLayout.addDrawerListener(actionBarDrawerToggle)
actionBarDrawerToggle.syncState()
navigationView.setNavigationItemSelectedListener {
if(previousMenuItem != null){
previousMenuItem?.isChecked = false
}
it.isCheckable = true
it.isChecked = true
previousMenuItem = it
when(it.itemId){
R.id.dashboard ->{
openDashboard()
drawerLayout.closeDrawers()
}
R.id.favourite ->{
supportFragmentManager.beginTransaction().replace(
R.id.frameLayout,
FavouritesFragment()
)
.commit()
supportActionBar?.title ="Favourites"
drawerLayout.closeDrawers()
}
R.id.profile ->{
supportFragmentManager.beginTransaction().replace(
R.id.frameLayout,
ProfileFragment()
)
.commit()
supportActionBar?.title ="Profile"
drawerLayout.closeDrawers()
}
R.id.about ->{
supportFragmentManager.beginTransaction().replace(
R.id.frameLayout,
AboutAppFragment()
)
.commit()
supportActionBar?.title ="About App"
drawerLayout.closeDrawers()
}
}
return@setNavigationItemSelectedListener true
}
}
fun setUpToolBar(){
setSupportActionBar(toolbar)
supportActionBar?.title = "Toolbar Title"
supportActionBar?.setHomeButtonEnabled(true)
supportActionBar?.setDisplayHomeAsUpEnabled(true)
}
override fun onOptionsItemSelected(item: MenuItem): Boolean {
val id = item.itemId
if(id== R.id.home){
drawerLayout.openDrawer(GravityCompat.START)
}
return super.onOptionsItemSelected(item)
}
fun openDashboard(){
val fragment = DashboardFragment()
val transaction = supportFragmentManager.beginTransaction()
transaction.replace(R.id.frameLayout,fragment)
transaction.commit()
supportActionBar?.title = "Dashboard"
navigationView.setCheckedItem(R.id.dashboard)
}
override fun onBackPressed() {
val frag = supportFragmentManager.findFragmentById(R.id.frameLayout)
when(frag){
!is DashboardFragment -> openDashboard()
else -> super.onBackPressed()
}
}
}
Logcat 指向第 34 行的错误 setUpToolBar()
和第 93 行 setSupportActionBar(toolbar)
在主要 Activity
我的Logcat
2021-05-27 20:15:40.373 30082-30082/? E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.syddhoo.bookapp, PID: 30082
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.syddhoo.bookapp/com.syddhoo.bookapp.pack.MainActivity}: java.lang.IllegalStateException: This Activity already has an action bar supplied by the window decor. Do not request Window.FEATURE_SUPPORT_ACTION_BAR and set windowActionBar to false in your theme to use a Toolbar instead.
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3792)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3968)
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$H.handleMessage(ActivityThread.java:2307)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:246)
at android.app.ActivityThread.main(ActivityThread.java:8506)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:602)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1139)
Caused by: java.lang.IllegalStateException: This Activity already has an action bar supplied by the window decor. Do not request Window.FEATURE_SUPPORT_ACTION_BAR and set windowActionBar to false in your theme to use a Toolbar instead.
at androidx.appcompat.app.AppCompatDelegateImpl.setSupportActionBar(AppCompatDelegateImpl.java:572)
at androidx.appcompat.app.AppCompatActivity.setSupportActionBar(AppCompatActivity.java:159)
at com.syddhoo.bookapp.pack.MainActivity.setUpToolBar(MainActivity.kt:93)
at com.syddhoo.bookapp.pack.MainActivity.onCreate(MainActivity.kt:34)
at android.app.Activity.performCreate(Activity.java:8198)
at android.app.Activity.performCreate(Activity.java:8182)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1309)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3765)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3968)
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$H.handleMessage(ActivityThread.java:2307)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:246)
at android.app.ActivityThread.main(ActivityThread.java:8506)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:602)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1139)
错误似乎与操作栏有关。我有什么东西需要进口吗？我是一个非常初学者 android 的开发人员，也是堆栈溢出的新手。欢迎任何建议。提前致谢。
错误说
This Activity already has an action bar supplied by the window decor.
Do not request Window.FEATURE_SUPPORT_ACTION_BAR and set
windowActionBar to false in your theme to use a Toolbar instead.
您需要更改 themes.xml 中的代码。
它应该有这样的一行。
<style name="Theme.projectName" parent="Theme.MaterialComponents.Light.NoActionBar">
NoActionBar 很重要。它将禁用默认操作栏。
请原谅我糟糕的问题起草技巧，请帮助我理解 logcat 中显示的错误，我认为这是我的应用停止的原因
我的主Activity文件
package com.syddhoo.bookapp.pack
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.MenuItem
import android.widget.FrameLayout
import androidx.appcompat.widget.Toolbar
import androidx.appcompat.app.ActionBarDrawerToggle
import androidx.core.view.GravityCompat
import androidx.drawerlayout.widget.DrawerLayout
import androidx.coordinatorlayout.widget.CoordinatorLayout
import com.google.android.material.navigation.NavigationView
import com.syddhoo.bookapp.*
class MainActivity : AppCompatActivity() {
lateinit var drawerLayout: DrawerLayout
lateinit var coordinatorLayout: CoordinatorLayout
lateinit var toolbar: Toolbar
lateinit var frameLayout: FrameLayout
lateinit var navigationView: NavigationView
var previousMenuItem : MenuItem? = null
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
drawerLayout = findViewById(R.id.drawerLayout)
coordinatorLayout = findViewById(R.id.coordinatorLayout)
toolbar = findViewById(R.id.toolbar)
frameLayout = findViewById(R.id.frameLayout)
navigationView = findViewById(R.id.navigationView)
setUpToolBar()
openDashboard()
val actionBarDrawerToggle = ActionBarDrawerToggle(this@MainActivity, drawerLayout,
R.string.open_drawer,
R.string.close_drawer
)
drawerLayout.addDrawerListener(actionBarDrawerToggle)
actionBarDrawerToggle.syncState()
navigationView.setNavigationItemSelectedListener {
if(previousMenuItem != null){
previousMenuItem?.isChecked = false
}
it.isCheckable = true
it.isChecked = true
previousMenuItem = it
when(it.itemId){
R.id.dashboard ->{
openDashboard()
drawerLayout.closeDrawers()
}
R.id.favourite ->{
supportFragmentManager.beginTransaction().replace(
R.id.frameLayout,
FavouritesFragment()
)
.commit()
supportActionBar?.title ="Favourites"
drawerLayout.closeDrawers()
}
R.id.profile ->{
supportFragmentManager.beginTransaction().replace(
R.id.frameLayout,
ProfileFragment()
)
.commit()
supportActionBar?.title ="Profile"
drawerLayout.closeDrawers()
}
R.id.about ->{
supportFragmentManager.beginTransaction().replace(
R.id.frameLayout,
AboutAppFragment()
)
.commit()
supportActionBar?.title ="About App"
drawerLayout.closeDrawers()
}
}
return@setNavigationItemSelectedListener true
}
}
fun setUpToolBar(){
setSupportActionBar(toolbar)
supportActionBar?.title = "Toolbar Title"
supportActionBar?.setHomeButtonEnabled(true)
supportActionBar?.setDisplayHomeAsUpEnabled(true)
}
override fun onOptionsItemSelected(item: MenuItem): Boolean {
val id = item.itemId
if(id== R.id.home){
drawerLayout.openDrawer(GravityCompat.START)
}
return super.onOptionsItemSelected(item)
}
fun openDashboard(){
val fragment = DashboardFragment()
val transaction = supportFragmentManager.beginTransaction()
transaction.replace(R.id.frameLayout,fragment)
transaction.commit()
supportActionBar?.title = "Dashboard"
navigationView.setCheckedItem(R.id.dashboard)
}
override fun onBackPressed() {
val frag = supportFragmentManager.findFragmentById(R.id.frameLayout)
when(frag){
!is DashboardFragment -> openDashboard()
else -> super.onBackPressed()
}
}
}
Logcat 指向第 34 行的错误 setUpToolBar() 和第 93 行 setSupportActionBar(toolbar) 在主要 Activity 我的Logcat
2021-05-27 20:15:40.373 30082-30082/? E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.syddhoo.bookapp, PID: 30082
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.syddhoo.bookapp/com.syddhoo.bookapp.pack.MainActivity}: java.lang.IllegalStateException: This Activity already has an action bar supplied by the window decor. Do not request Window.FEATURE_SUPPORT_ACTION_BAR and set windowActionBar to false in your theme to use a Toolbar instead.
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3792)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3968)
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$H.handleMessage(ActivityThread.java:2307)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:246)
at android.app.ActivityThread.main(ActivityThread.java:8506)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:602)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1139)
Caused by: java.lang.IllegalStateException: This Activity already has an action bar supplied by the window decor. Do not request Window.FEATURE_SUPPORT_ACTION_BAR and set windowActionBar to false in your theme to use a Toolbar instead.
at androidx.appcompat.app.AppCompatDelegateImpl.setSupportActionBar(AppCompatDelegateImpl.java:572)
at androidx.appcompat.app.AppCompatActivity.setSupportActionBar(AppCompatActivity.java:159)
at com.syddhoo.bookapp.pack.MainActivity.setUpToolBar(MainActivity.kt:93)
at com.syddhoo.bookapp.pack.MainActivity.onCreate(MainActivity.kt:34)
at android.app.Activity.performCreate(Activity.java:8198)
at android.app.Activity.performCreate(Activity.java:8182)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1309)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3765)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3968)
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$H.handleMessage(ActivityThread.java:2307)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:246)
at android.app.ActivityThread.main(ActivityThread.java:8506)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:602)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1139)
错误似乎与操作栏有关。我有什么东西需要进口吗？我是一个非常初学者 android 的开发人员，也是堆栈溢出的新手。欢迎任何建议。提前致谢。
错误说
This Activity already has an action bar supplied by the window decor. Do not request Window.FEATURE_SUPPORT_ACTION_BAR and set windowActionBar to false in your theme to use a Toolbar instead.
您需要更改 themes.xml 中的代码。
它应该有这样的一行。
<style name="Theme.projectName" parent="Theme.MaterialComponents.Light.NoActionBar">
NoActionBar 很重要。它将禁用默认操作栏。