Skip to content

Instantly share code, notes, and snippets.

@ssaurel
Created May 14, 2018 13:50
Show Gist options
  • Save ssaurel/7e4c04d71fdce0862331c3d3934e34b2 to your computer and use it in GitHub Desktop.
Save ssaurel/7e4c04d71fdce0862331c3d3934e34b2 to your computer and use it in GitHub Desktop.
Main Activity of our Bitcoin Android App with Kotlin on the SSaurel's Blog
package com.ssaurel.bitcoinpricewatcher
import android.os.Bundle
import android.support.v7.app.AppCompatActivity
import android.view.Menu
import android.view.MenuItem
import android.view.View
import kotlinx.android.synthetic.main.activity_main.*
import okhttp3.*
import org.json.JSONObject
import java.io.IOException
class MainActivity : AppCompatActivity() {
// We will use the Coin Desk API to get Bitcoin price
val URL = "https://api.coindesk.com/v1/bpi/currentprice.json"
var okHttpClient: OkHttpClient = OkHttpClient()
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
}
override fun onCreateOptionsMenu(menu: Menu?): Boolean {
menuInflater.inflate(R.menu.main, menu)
return super.onCreateOptionsMenu(menu)
}
override fun onOptionsItemSelected(item: MenuItem): Boolean {
when(item.itemId) {
R.id.load -> {
loadBitcoinPrice()
return true
}
}
return super.onOptionsItemSelected(item)
}
private fun loadBitcoinPrice() {
progressBar.visibility = View.VISIBLE
val request: Request = Request.Builder().url(URL).build()
okHttpClient.newCall(request).enqueue(object : Callback {
override fun onFailure(call: Call?, e: IOException?) { }
override fun onResponse(call: Call?, response: Response?) {
val json = response?.body()?.string()
// we get the json response returned by the Coin Desk API
// make this call on a browser for example to watch the properties
// here we get USD and EUR rates properties
// we split the value got just to keep the integer part of the values
val usdRate = (JSONObject(json).getJSONObject("bpi").getJSONObject("USD")["rate"] as String).split(".")[0]
val eurRate = (JSONObject(json).getJSONObject("bpi").getJSONObject("EUR")["rate"] as String).split(".")[0]
runOnUiThread {
progressBar.visibility = View.GONE
bitcoinValues.text = "$$usdRate\n\n$eurRate€"
}
}
})
}
}
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment