Android kotlin - BottomNavigationView 在 TimerTask 中使用 BadgeView
Android kotlin - BottomNavigationView use BadgeView inside TimerTask
这是有效的代码:
class Whosebug : AppCompatActivity() {
private var menuView: BottomNavigationMenuView? = null
private var mBottomNavigationView: BottomNavigationView? = null
private var newmsgTimer: Timer? = null
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_home)
mBottomNavigationView = findViewById<View>(R.id.bottom_navigation) as BottomNavigationView
menuView = mBottomNavigationView!!.getChildAt(0) as BottomNavigationMenuView
mBottomNavigationView!!.setOnNavigationItemSelectedListener { item ->
when (item.itemId) {
R.id.nav_voting -> {
}
R.id.nav_search -> {
}
}
return@setOnNavigationItemSelectedListener true
}
newmsg()
}
private fun newmsg(){
QBadgeView(this@Whosebug).bindTarget(menuView!!.getChildAt(3)).badgeNumber = 7 // IT WORKS HERE
newmsgTimer = Timer()
val timerTask = object:TimerTask() {
override fun run() {
Log.d("letsSee", "PIKABOO") // it's getting printed
}
}
newmsgTimer!!.schedule(timerTask, 0, 60000)
}
}
但是当我尝试在 TimerTask 中使用 QBadgeView(this@Home).bindTarget(menuView!!.getChildAt(3)).badgeNumber = 7
时:
private fun newmsg(){
newmsgTimer = Timer()
val timerTask = object:TimerTask() {
override fun run() {
Log.d("letsSee", "PIKABOO") // it's getting printed
QBadgeView(this@Whosebug).bindTarget(menuView!!.getChildAt(3)).badgeNumber = 7 // DOESN'T WORKS HERE
}
}
newmsgTimer!!.schedule(timerTask, 0, 60000)
}
那就不行了
而且我不知道这个错误是关于什么的:
java.lang.NullPointerException: Attempt to invoke virtual method 'int android.view.View.getVisibility()' on a null object reference
at android.support.design.internal.BottomNavigationMenuView.onMeasure(BottomNavigationMenuView.java:145)
关于如何让它在 TimeTask 中工作的任何想法?提前致谢
编辑:
又一个运行我也遇到了这个错误:
FATAL EXCEPTION: Timer-1
Process: com.exmpl.exmpl, PID: 9978
android.view.ViewRootImpl$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.
忽略这个:需要添加更多的词 blabla
您不能直接在另一个线程上更改视图属性,您只能在主线程上更改。
val timerTask = object : TimerTask() {
override fun run() {
Log.d("letsSee", "PIKABOO") // it's getting printed
menuView.post{
QBadgeView(this@Whosebug).bindTarget(menuView!!.getChildAt(3)).badgeNumber = 7
}
}
这是有效的代码:
class Whosebug : AppCompatActivity() {
private var menuView: BottomNavigationMenuView? = null
private var mBottomNavigationView: BottomNavigationView? = null
private var newmsgTimer: Timer? = null
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_home)
mBottomNavigationView = findViewById<View>(R.id.bottom_navigation) as BottomNavigationView
menuView = mBottomNavigationView!!.getChildAt(0) as BottomNavigationMenuView
mBottomNavigationView!!.setOnNavigationItemSelectedListener { item ->
when (item.itemId) {
R.id.nav_voting -> {
}
R.id.nav_search -> {
}
}
return@setOnNavigationItemSelectedListener true
}
newmsg()
}
private fun newmsg(){
QBadgeView(this@Whosebug).bindTarget(menuView!!.getChildAt(3)).badgeNumber = 7 // IT WORKS HERE
newmsgTimer = Timer()
val timerTask = object:TimerTask() {
override fun run() {
Log.d("letsSee", "PIKABOO") // it's getting printed
}
}
newmsgTimer!!.schedule(timerTask, 0, 60000)
}
}
但是当我尝试在 TimerTask 中使用 QBadgeView(this@Home).bindTarget(menuView!!.getChildAt(3)).badgeNumber = 7
时:
private fun newmsg(){
newmsgTimer = Timer()
val timerTask = object:TimerTask() {
override fun run() {
Log.d("letsSee", "PIKABOO") // it's getting printed
QBadgeView(this@Whosebug).bindTarget(menuView!!.getChildAt(3)).badgeNumber = 7 // DOESN'T WORKS HERE
}
}
newmsgTimer!!.schedule(timerTask, 0, 60000)
}
那就不行了
而且我不知道这个错误是关于什么的:
java.lang.NullPointerException: Attempt to invoke virtual method 'int android.view.View.getVisibility()' on a null object reference
at android.support.design.internal.BottomNavigationMenuView.onMeasure(BottomNavigationMenuView.java:145)
关于如何让它在 TimeTask 中工作的任何想法?提前致谢
编辑:
又一个运行我也遇到了这个错误:
FATAL EXCEPTION: Timer-1
Process: com.exmpl.exmpl, PID: 9978
android.view.ViewRootImpl$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.
忽略这个:需要添加更多的词 blabla
您不能直接在另一个线程上更改视图属性,您只能在主线程上更改。
val timerTask = object : TimerTask() {
override fun run() {
Log.d("letsSee", "PIKABOO") // it's getting printed
menuView.post{
QBadgeView(this@Whosebug).bindTarget(menuView!!.getChildAt(3)).badgeNumber = 7
}
}