android基础学习——service及BroadcastReceiver
作者:互联网
(1)demo功能描述:
在Activity中绑定service,在service中接收到绑定的回调后,发送广播,并在Activity中接收Service发送的广播。
(2)实现
关键类及关键方法清单
service—onBind()
ServiceConnection
bindService()
unBindService()
sendBroadcast()
IntentFilter—addAction()
registerReceiver()
unRegisterReceiver()
实现过程—注册广播接受者及绑定Service
val myReceiver : BroadcastReceiver = object : BroadcastReceiver() {
override fun onReceive(context: Context?, intent: Intent?) {
when(intent?.action){
"a"->{
Log.d("receiver","receive a")
}
"b"->{
Log.d("receiver","receive b")
}
"c"->{
Log.d("receiver","receive c")
}
"d"->{
Log.d("receiver","receive d")
}
}
}
}
val myConnection = object : ServiceConnection{
override fun onServiceDisconnected(name: ComponentName?) {
}
override fun onServiceConnected(name: ComponentName?, service: IBinder?) {
}
}
val filter = IntentFilter()
filter.addAction("a")
filter.addAction("b")
registerReceiver(myReceiver,filter)
val intent = Intent(this,BroadcastService::class.java)
intent.putExtra("type","apageActivity")
bindService(intent,myConnection, Context.BIND_AUTO_CREATE)
实现过程—Service发送广播
override fun onBind(intent: Intent?): IBinder? {
Log.d(Tag,"onBind")
val type = intent?.getStringExtra("type")?:"temp"
val intent = Intent("a")
intent.putExtra("type",type)
sendBroadcast(intent)
val intent1 = Intent("b")
intent1.putExtra("type",type)
sendBroadcast(intent1)
val intent2 = Intent("c")
intent2.putExtra("type",type)
sendBroadcast(intent2)
val intent3 = Intent("d")
intent3.putExtra("type",type)
sendBroadcast(intent3)
return object : Binder(){}
}
注意事项:
在Activity被销毁之前要将服务解绑将广播接受者取消register
unbindService(myConnection)
unregisterReceiver(myReceiver)
另,service的onBind方法执行的时机参考https://blog.csdn.net/u013553529/article/details/54754491
标签:service,val,putExtra,intent,Intent,android,BroadcastReceiver,type 来源: https://blog.csdn.net/yangy_12345/article/details/113836582