How can I use coroutines with volley so that my code can be written like sychronous?
1
Here's an example from developer.android.com
class MainActivity : AppCompatActivity() {
lateinit var textView:TextView
lateinit var button:Button
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
textView = findViewById(R.id.textView)
button = findViewById(R.id.button)
button.setOnClickListener({
getData()
})
}
fun getData(){
val queue = Volley.newRequestQueue(this)
val url = "http://www.google.com/"
val stringRequest = StringRequest(Request.Method.GET, url,
Response.Listener<String> { response ->
textView.text = "Response is: ${response.substring(0, 500)}"
},
Response.ErrorListener { textView.text = "Something went wrong!" })
queue.add(stringRequest)
}
}
How can I take advantage of coroutines so I can write my code in this manner:
val data = getData()
textView.text = data
kotlin android-volley coroutine
asked Nov 26 '18 at 17:19
LanceLance
1,23822042
add a comment |
1
Here's an example from developer.android.com
class MainActivity : AppCompatActivity() {
lateinit var textView:TextView
lateinit var button:Button
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
textView = findViewById(R.id.textView)
button = findViewById(R.id.button)
button.setOnClickListener({
getData()
})
}
fun getData(){
val queue = Volley.newRequestQueue(this)
val url = "http://www.google.com/"
val stringRequest = StringRequest(Request.Method.GET, url,
Response.Listener<String> { response ->
textView.text = "Response is: ${response.substring(0, 500)}"
},
Response.ErrorListener { textView.text = "Something went wrong!" })
queue.add(stringRequest)
}
}
How can I take advantage of coroutines so I can write my code in this manner:
val data = getData()
textView.text = data
kotlin android-volley coroutine
asked Nov 26 '18 at 17:19
LanceLance
1,23822042
add a comment |
1
1
1
Here's an example from developer.android.com
class MainActivity : AppCompatActivity() {
lateinit var textView:TextView
lateinit var button:Button
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
textView = findViewById(R.id.textView)
button = findViewById(R.id.button)
button.setOnClickListener({
getData()
})
}
fun getData(){
val queue = Volley.newRequestQueue(this)
val url = "http://www.google.com/"
val stringRequest = StringRequest(Request.Method.GET, url,
Response.Listener<String> { response ->
textView.text = "Response is: ${response.substring(0, 500)}"
},
Response.ErrorListener { textView.text = "Something went wrong!" })
queue.add(stringRequest)
}
}
How can I take advantage of coroutines so I can write my code in this manner:
val data = getData()
textView.text = data
kotlin android-volley coroutine
asked Nov 26 '18 at 17:19
LanceLance
1,23822042
Here's an example from developer.android.com
class MainActivity : AppCompatActivity() {
lateinit var textView:TextView
lateinit var button:Button
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
textView = findViewById(R.id.textView)
button = findViewById(R.id.button)
button.setOnClickListener({
getData()
})
}
fun getData(){
val queue = Volley.newRequestQueue(this)
val url = "http://www.google.com/"
val stringRequest = StringRequest(Request.Method.GET, url,
Response.Listener<String> { response ->
textView.text = "Response is: ${response.substring(0, 500)}"
},
Response.ErrorListener { textView.text = "Something went wrong!" })
queue.add(stringRequest)
}
}
How can I take advantage of coroutines so I can write my code in this manner:
val data = getData()
textView.text = data
kotlin android-volley coroutine
kotlin android-volley coroutine
asked Nov 26 '18 at 17:19
LanceLance
1,23822042
asked Nov 26 '18 at 17:19
LanceLance
1,23822042
edited Nov 26 '18 at 18:04
Lance
asked Nov 26 '18 at 17:19
LanceLance
1,23822042
asked Nov 26 '18 at 17:19
LanceLance
1,23822042
asked Nov 26 '18 at 17:19
LanceLance
1,23822042
1,23822042
add a comment |
add a comment |
1 Answer
1
active
oldest
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3
You can use suspendCoroutine, see https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.coroutines.experimental/suspend-coroutine.html
suspend fun getData() = suspendCoroutine<String> { cont ->
val queue = Volley.newRequestQueue(this)
val url = "http://www.google.com/"
val stringRequest = StringRequest(Request.Method.GET, url,
Response.Listener<String> { response ->
cont.resume("Response is: ${response.substring(0, 500)}")
},
Response.ErrorListener { cont.resume("Something went wrong!") })
queue.add(stringRequest)
}
You should implement your activity like described here: https://github.com/Kotlin/kotlinx.coroutines/blob/master/ui/coroutines-guide-ui.md#structured-concurrency-lifecycle-and-coroutine-parent-child-hierarchy
class MainActivity: AppCompatActivity(), CoroutineScope {
protected lateinit var job: Job
override val coroutineContext: CoroutineContext
get() = job + Dispatchers.Main
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
job = Job()
...
button.setOnClickListener({
launch {
val data = getData()
textView.text = data
}
})
}
override fun onDestroy() {
super.onDestroy()
job.cancel()
}
}
answered Nov 26 '18 at 17:29
ReneRene
2,07627
how can I use that in the context of updating the textView.text? Let's say in the onclick listener in my example above, how will I be able to use this suspend function to get the data and update the textview?
– Lance
Nov 26 '18 at 19:41
Extended my answer with an application of thegetData()function
– Rene
Nov 26 '18 at 20:12
That worked, thanks Rene. Does that mean that I have to implement coroutinescope in every activity that I'm going to use coroutine with?
– Lance
Nov 26 '18 at 20:27
1
Yes you have. That is the reason, why a base class (see link) is useful.
– Rene
Nov 26 '18 at 20:34
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
3
You can use suspendCoroutine, see https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.coroutines.experimental/suspend-coroutine.html
suspend fun getData() = suspendCoroutine<String> { cont ->
val queue = Volley.newRequestQueue(this)
val url = "http://www.google.com/"
val stringRequest = StringRequest(Request.Method.GET, url,
Response.Listener<String> { response ->
cont.resume("Response is: ${response.substring(0, 500)}")
},
Response.ErrorListener { cont.resume("Something went wrong!") })
queue.add(stringRequest)
}
You should implement your activity like described here: https://github.com/Kotlin/kotlinx.coroutines/blob/master/ui/coroutines-guide-ui.md#structured-concurrency-lifecycle-and-coroutine-parent-child-hierarchy
class MainActivity: AppCompatActivity(), CoroutineScope {
protected lateinit var job: Job
override val coroutineContext: CoroutineContext
get() = job + Dispatchers.Main
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
job = Job()
...
button.setOnClickListener({
launch {
val data = getData()
textView.text = data
}
})
}
override fun onDestroy() {
super.onDestroy()
job.cancel()
}
}
answered Nov 26 '18 at 17:29
ReneRene
2,07627
how can I use that in the context of updating the textView.text? Let's say in the onclick listener in my example above, how will I be able to use this suspend function to get the data and update the textview?
– Lance
Nov 26 '18 at 19:41
Extended my answer with an application of thegetData()function
– Rene
Nov 26 '18 at 20:12
That worked, thanks Rene. Does that mean that I have to implement coroutinescope in every activity that I'm going to use coroutine with?
– Lance
Nov 26 '18 at 20:27
1
Yes you have. That is the reason, why a base class (see link) is useful.
– Rene
Nov 26 '18 at 20:34
add a comment |
3
You can use suspendCoroutine, see https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.coroutines.experimental/suspend-coroutine.html
suspend fun getData() = suspendCoroutine<String> { cont ->
val queue = Volley.newRequestQueue(this)
val url = "http://www.google.com/"
val stringRequest = StringRequest(Request.Method.GET, url,
Response.Listener<String> { response ->
cont.resume("Response is: ${response.substring(0, 500)}")
},
Response.ErrorListener { cont.resume("Something went wrong!") })
queue.add(stringRequest)
}
You should implement your activity like described here: https://github.com/Kotlin/kotlinx.coroutines/blob/master/ui/coroutines-guide-ui.md#structured-concurrency-lifecycle-and-coroutine-parent-child-hierarchy
class MainActivity: AppCompatActivity(), CoroutineScope {
protected lateinit var job: Job
override val coroutineContext: CoroutineContext
get() = job + Dispatchers.Main
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
job = Job()
...
button.setOnClickListener({
launch {
val data = getData()
textView.text = data
}
})
}
override fun onDestroy() {
super.onDestroy()
job.cancel()
}
}
answered Nov 26 '18 at 17:29
ReneRene
2,07627
how can I use that in the context of updating the textView.text? Let's say in the onclick listener in my example above, how will I be able to use this suspend function to get the data and update the textview?
– Lance
Nov 26 '18 at 19:41
Extended my answer with an application of thegetData()function
– Rene
Nov 26 '18 at 20:12
That worked, thanks Rene. Does that mean that I have to implement coroutinescope in every activity that I'm going to use coroutine with?
– Lance
Nov 26 '18 at 20:27
1
Yes you have. That is the reason, why a base class (see link) is useful.
– Rene
Nov 26 '18 at 20:34
add a comment |
3
3
3
You can use suspendCoroutine, see https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.coroutines.experimental/suspend-coroutine.html
suspend fun getData() = suspendCoroutine<String> { cont ->
val queue = Volley.newRequestQueue(this)
val url = "http://www.google.com/"
val stringRequest = StringRequest(Request.Method.GET, url,
Response.Listener<String> { response ->
cont.resume("Response is: ${response.substring(0, 500)}")
},
Response.ErrorListener { cont.resume("Something went wrong!") })
queue.add(stringRequest)
}
You should implement your activity like described here: https://github.com/Kotlin/kotlinx.coroutines/blob/master/ui/coroutines-guide-ui.md#structured-concurrency-lifecycle-and-coroutine-parent-child-hierarchy
class MainActivity: AppCompatActivity(), CoroutineScope {
protected lateinit var job: Job
override val coroutineContext: CoroutineContext
get() = job + Dispatchers.Main
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
job = Job()
...
button.setOnClickListener({
launch {
val data = getData()
textView.text = data
}
})
}
override fun onDestroy() {
super.onDestroy()
job.cancel()
}
}
answered Nov 26 '18 at 17:29
ReneRene
2,07627
You can use suspendCoroutine, see https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.coroutines.experimental/suspend-coroutine.html
suspend fun getData() = suspendCoroutine<String> { cont ->
val queue = Volley.newRequestQueue(this)
val url = "http://www.google.com/"
val stringRequest = StringRequest(Request.Method.GET, url,
Response.Listener<String> { response ->
cont.resume("Response is: ${response.substring(0, 500)}")
},
Response.ErrorListener { cont.resume("Something went wrong!") })
queue.add(stringRequest)
}
You should implement your activity like described here: https://github.com/Kotlin/kotlinx.coroutines/blob/master/ui/coroutines-guide-ui.md#structured-concurrency-lifecycle-and-coroutine-parent-child-hierarchy
class MainActivity: AppCompatActivity(), CoroutineScope {
protected lateinit var job: Job
override val coroutineContext: CoroutineContext
get() = job + Dispatchers.Main
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
job = Job()
...
button.setOnClickListener({
launch {
val data = getData()
textView.text = data
}
})
}
override fun onDestroy() {
super.onDestroy()
job.cancel()
}
}
answered Nov 26 '18 at 17:29
ReneRene
2,07627
edited Nov 26 '18 at 20:11
answered Nov 26 '18 at 17:29
ReneRene
2,07627
answered Nov 26 '18 at 17:29
ReneRene
2,07627
answered Nov 26 '18 at 17:29
ReneRene
2,07627
2,07627
how can I use that in the context of updating the textView.text? Let's say in the onclick listener in my example above, how will I be able to use this suspend function to get the data and update the textview?
– Lance
Nov 26 '18 at 19:41
Extended my answer with an application of thegetData()function
– Rene
Nov 26 '18 at 20:12
That worked, thanks Rene. Does that mean that I have to implement coroutinescope in every activity that I'm going to use coroutine with?
– Lance
Nov 26 '18 at 20:27
1
Yes you have. That is the reason, why a base class (see link) is useful.
– Rene
Nov 26 '18 at 20:34
add a comment |
how can I use that in the context of updating the textView.text? Let's say in the onclick listener in my example above, how will I be able to use this suspend function to get the data and update the textview?
– Lance
Nov 26 '18 at 19:41
Extended my answer with an application of thegetData()function
– Rene
Nov 26 '18 at 20:12
That worked, thanks Rene. Does that mean that I have to implement coroutinescope in every activity that I'm going to use coroutine with?
– Lance
Nov 26 '18 at 20:27
1
Yes you have. That is the reason, why a base class (see link) is useful.
– Rene
Nov 26 '18 at 20:34
how can I use that in the context of updating the textView.text? Let's say in the onclick listener in my example above, how will I be able to use this suspend function to get the data and update the textview?
– Lance
Nov 26 '18 at 19:41
how can I use that in the context of updating the textView.text? Let's say in the onclick listener in my example above, how will I be able to use this suspend function to get the data and update the textview?
– Lance
Nov 26 '18 at 19:41
Extended my answer with an application of the
getData() function– Rene
Nov 26 '18 at 20:12
Extended my answer with an application of the
getData() function– Rene
Nov 26 '18 at 20:12
That worked, thanks Rene. Does that mean that I have to implement coroutinescope in every activity that I'm going to use coroutine with?
– Lance
Nov 26 '18 at 20:27
That worked, thanks Rene. Does that mean that I have to implement coroutinescope in every activity that I'm going to use coroutine with?
– Lance
Nov 26 '18 at 20:27
1
1
Yes you have. That is the reason, why a base class (see link) is useful.
– Rene
Nov 26 '18 at 20:34
Yes you have. That is the reason, why a base class (see link) is useful.
– Rene
Nov 26 '18 at 20:34
add a comment |
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