How to send string data from Activity to started Service onclick method?

huangapple
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英文:

How to send string data from Activity to started Service onclick method?

问题

以下是您要翻译的内容：

我有一个活动和一个服务。应用程序上有三个按钮。其中一个是“开始”按钮，用于启动服务；另一个是“测试”按钮，用于发送“Test”字符串到服务；最后一个是“停止”按钮，用于停止服务。

我可以正常启动和停止服务，但是当我尝试发送字符串时，我尝试了Intent，但是找不到任何方法来实现这一点。我还尝试了onStartCommand()，但是这个方法也无法触发。

您有什么建议吗？

这是我的活动部分：

  1. override fun onCreate(savedInstanceState: Bundle?) {
  2.     super.onCreate(savedInstanceState)
  3.     setContentView(R.layout.activity_main)
  4.     serviceIntent = Intent(applicationContext, MyService::class.java)
  5. }
  7. fun sendLogin(view: View){
  8.     startService(serviceIntent)
  9.     if (isMyServiceRunning(MyService::class.java)){
  10.         Toast.makeText(applicationContext, "Service Started", Toast.LENGTH_SHORT).show()
  11.     }
  12. }
  14. fun sendTest(view: View){ //尝试发送“TEST”
  15.     val intent = Intent(this, MyService::class.java)
  16.     val msj = "TEST"
  17.     intent.putExtra("key", msj)
  18.     applicationContext.startService(intent)
  19. }
  21. fun sendLogout(view: View){ //停止服务
  22.     stopService(serviceIntent)
  23.     if (!isMyServiceRunning(MyService::class.java)){
  24.         Toast.makeText(applicationContext, "Service Stopped", Toast.LENGTH_SHORT).show()
  25.     }
  26. }
  28. private fun isMyServiceRunning(serviceClass: Class<*>): Boolean { //检查应用程序是否已启动
  29.     val manager = getSystemService(ACTIVITY_SERVICE) as ActivityManager
  30.     for (service in manager.getRunningServices(Int.MAX_VALUE)) {
  31.         if (serviceClass.name == service.service.className) {
  32.             return true
  33.         }
  34.     }
  35.     return false
  36. }

这是我的服务部分：

  1. private inner class MessageRequestHandler() : Handler()   {
  2.     override fun handleMessage(msg: Message) {
  3.         when (msg.what) {
  4.             SEND_MESSAGE_FLAG -> {
  5.                 val bundle = Bundle()
  6.                 bundle.putString("key", stringMessage)
  7.                 val mesg = Message.obtain(null, SEND_MESSAGE_FLAG)
  8.                 mesg.obj = bundle
  9.                 try {
  10.                     msg.replyTo.send(mesg)
  11.                 } catch (e: RemoteException) {
  12.                     Log.i(TAG, "Error: " + e.message)
  13.                 }
  14.             }
  15.         }
  17.         super.handleMessage(msg)
  18.     }
  19. }
  21. override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int { //无法触发此方法...
  22.     stringMessage = intent?.extras?.getString("key").toString()
  23.     return super.onStartCommand(intent, flags, startId)
  24. }
  26. private val messageMessenger: Messenger = Messenger(MessageRequestHandler())
  27. override fun onBind(intent: Intent?): IBinder {
  28.     return messageMessenger.binder
  29. }

谢谢。

英文:

I have one activity and service. I have three button on app. One of is Start to start Service the other is Test to send Service "Test" string the other is Stop to stop service.

I can start and stop service without any problem but when i try to send string i tried Intent but cannot find any way for this. I also tried onStartCommand() but cannot fire that method too..

What you can suggest?

Here my Activity

  1.  override fun onCreate(savedInstanceState: Bundle?) {
  2.     super.onCreate(savedInstanceState)
  3.     setContentView(R.layout.activity_main)
  4.     serviceIntent = Intent(applicationContext, MyService::class.java)
  5. }
  9. fun sendLogin(view: View){
  10.     startService(serviceIntent)
  11.     if (isMyServiceRunning(MyService::class.java)){
  12.         Toast.makeText(applicationContext, &quot;Service Started&quot;, Toast.LENGTH_SHORT).show()
  13.     }
  15. }
  17. fun sendTest(view: View){ //TRY TO SEND &quot;TEST&quot; 
  18.     val intent = Intent(this, MyService::class.java)
  19.     val msj = &quot;TEST&quot;
  20.     intent.putExtra(&quot;key&quot;, msj)
  21.     applicationContext.startService(intent);
  22. }
  24. fun sendLogout(view: View){ //Stop service
  25.     stopService(serviceIntent)
  26.     if (!isMyServiceRunning(MyService::class.java)){
  27.         Toast.makeText(applicationContext, &quot;Service Stopped&quot;, Toast.LENGTH_SHORT).show()
  28.     }
  30. }
  32. private fun isMyServiceRunning(serviceClass: Class&lt;*&gt;): Boolean { //Checking app is started or not
  33.     val manager = getSystemService(ACTIVITY_SERVICE) as ActivityManager
  34.     for (service in manager.getRunningServices(Int.MAX_VALUE)) {
  35.         if (serviceClass.name == service.service.className) {
  36.             return true
  37.         }
  38.     }
  39.     return false
  40. }

Here my service

  1. private inner class MessageRequestHandler() : Handler()   {
  2.     override fun handleMessage(msg: Message) {
  3.         when (msg.what) {
  4.             SEND_MESSAGE_FLAG -&gt; {
  5.                 val bundle = Bundle()
  6.                 bundle.putString(&quot;key&quot;, stringMessage)
  7.                 val mesg = Message.obtain(null, SEND_MESSAGE_FLAG)
  8.                 mesg.obj = bundle
  9.                 try {
  10.                     msg.replyTo.send(mesg)
  11.                 } catch (e: RemoteException) {
  12.                     Log.i(TAG, &quot;Error: &quot; + e.message)
  13.                 }
  14.             }
  15.         }
  17.         super.handleMessage(msg)
  18.     }
  20. }
  22. override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int { //Cannot fire this...
  23.     stringMessage = intent?.extras?.getString(&quot;key&quot;).toString()
  24.     return super.onStartCommand(intent, flags, startId)
  25. }
  27. private val messageMessenger: Messenger = Messenger(MessageRequestHandler())
  28. override fun onBind(intent: Intent?): IBinder {
  29.     return messageMessenger.binder
  30. }

Thanks

答案1

得分: 1

请检查，使用EventBus进行消息传递非常简单。以下是您的解决方案：

  1. //定义事件类
  2. class MessageEvent(val someString: String)
  4. //主活动
  5. class MainActivity : AppCompatActivity() {
  7.     private lateinit var serviceIntent: Intent
  9.     override fun onCreate(savedInstanceState: Bundle?) {
  10.         super.onCreate(savedInstanceState)
  11.         setContentView(R.layout.activity_main)
  12.         serviceIntent = Intent(applicationContext, MessageService::class.java)
  13.     }
  15.     fun sendLogin(view: View) {
  16.         startService(serviceIntent)
  17.         if (isMyServiceRunning(MessageService::class.java)) {
  18.             Toast.makeText(applicationContext, "Service Started", Toast.LENGTH_SHORT).show()
  19.         }
  20.     }
  22.     fun sendTest(view: View) {
  23.         //发布事件
  24.         EventBus.getDefault().post(MessageEvent("TEST"))
  25.     }
  27.     fun sendLogout(view: View) {
  28.         stopService(serviceIntent)
  29.         if (!isMyServiceRunning(MessageService::class.java)) {
  30.             Toast.makeText(applicationContext, "Service Stopped", Toast.LENGTH_SHORT).show()
  31.         }
  32.     }
  34.     private fun isMyServiceRunning(serviceClass: Class<*>): Boolean {
  35.         val manager = getSystemService(ACTIVITY_SERVICE) as ActivityManager
  36.         for (service in manager.getRunningServices(Int.MAX_VALUE)) {
  37.             if (serviceClass.name == service.service.className) {
  38.                 return true
  39.             }
  40.         }
  41.         return false
  42.     }
  43. }
  45. //服务类
  46. class MessageService : Service() {
  48.     private val TAG: String? = "InService"
  50.     private inner class MessageRequestHandler() : Handler() {
  51.         override fun handleMessage(msg: Message) {
  52.             super.handleMessage(msg)
  53.         }
  54.     }
  56.     @Subscribe(threadMode = ThreadMode.MAIN)
  57.     fun onMessageEvent(event: MessageEvent?) {
  58.         Log.i(TAG, "onMessageEvent: " + event?.someString)
  59.     }
  61.     override fun onStart(intent: Intent?, startId: Int) {
  62.         super.onStart(intent, startId)
  64.         //订阅EventBus
  65.         EventBus.getDefault().register(this);
  66.     }
  68.     override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
  69.         return super.onStartCommand(intent, flags, startId)
  70.     }
  72.     private val messageMessenger: Messenger = Messenger(MessageRequestHandler())
  73.     override fun onBind(intent: Intent?): IBinder {
  74.         return messageMessenger.binder
  75.     }
  77.     override fun onDestroy() {
  78.         super.onDestroy()
  80.         //取消订阅EventBus
  81.         EventBus.getDefault().unregister(this);
  82.     }
  83. }
英文:

Please check, message passing is easy using EventBus. Here's your solution:

  1. //Define Event Class
  2. class MessageEvent(val someString: String)

Main Activity

  1. class MainActivity : AppCompatActivity() {
  2. private lateinit var serviceIntent: Intent
  3. override fun onCreate(savedInstanceState: Bundle?) {
  4. super.onCreate(savedInstanceState)
  5. setContentView(R.layout.activity_main)
  6. serviceIntent = Intent(applicationContext, MessageService::class.java)
  7. }
  8. fun sendLogin(view: View){
  9. startService(serviceIntent)
  10. if (isMyServiceRunning(MessageService::class.java)){
  11. Toast.makeText(applicationContext, &quot;Service Started&quot;, Toast.LENGTH_SHORT).show()
  12. }
  13. }
  14. fun sendTest(view: View){
  15. //Post Events
  16. EventBus.getDefault().post(MessageEvent(&quot;TEST&quot;))
  17. }
  18. fun sendLogout(view: View){
  19. stopService(serviceIntent)
  20. if (!isMyServiceRunning(MessageService::class.java)){
  21. Toast.makeText(applicationContext, &quot;Service Stopped&quot;, Toast.LENGTH_SHORT).show()
  22. }
  23. }
  24. private fun isMyServiceRunning(serviceClass: Class&lt;*&gt;): Boolean {
  25. val manager = getSystemService(ACTIVITY_SERVICE) as ActivityManager
  26. for (service in manager.getRunningServices(Int.MAX_VALUE)) {
  27. if (serviceClass.name == service.service.className) {
  28. return true
  29. }
  30. }
  31. return false
  32. }
  33. }

And Service class

  1. class MessageService : Service() {
  2. private val TAG: String? = &quot;InService&quot;
  3. private inner class MessageRequestHandler() : Handler()   {
  4. override fun handleMessage(msg: Message) {
  5. super.handleMessage(msg)
  6. }
  7. }
  8. @Subscribe(threadMode = ThreadMode.MAIN)
  9. fun onMessageEvent(event: MessageEvent?) {
  10. Log.i(TAG, &quot;onMessageEvent: &quot; + event?.someString)
  11. }
  12. override fun onStart(intent: Intent?, startId: Int) {
  13. super.onStart(intent, startId)
  14. //subscribe to EventBus
  15. EventBus.getDefault().register(this);
  16. }
  17. override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
  18. return super.onStartCommand(intent, flags, startId)
  19. }
  20. private val messageMessenger: Messenger = Messenger(MessageRequestHandler())
  21. override fun onBind(intent: Intent?): IBinder {
  22. return messageMessenger.binder
  23. }
  24. override fun onDestroy() {
  25. super.onDestroy()
  26. //Unsubscribe to EventBus
  27. EventBus.getDefault().unregister(this);
  28. }
  29. }

huangapple
  • 本文由 发表于 2020年10月26日 03:59:25
  • 转载请务必保留本文链接：https://go.coder-hub.com/64528168.html
  • android
  • java
  • kotlin
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