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android:androidstudio2で始めるアプリ開発入門
以前のリビジョンの文書です
目次
androidstudio2で始めるアプリ開発入門
第７回.Androidアプリの画面遷移 ～ アクティビティの起動をつかさどるIntentクラス
SimpleAdapter
var list:MutableList<Map<String,String>> = mutableListOf() var map:Map<String,String> = mapOf("name" to "お味噌汁" ,"price" to "100") list.add(map) map= mapOf("name" to "お寿司","price" to "2000") list.add(map) map= mapOf("name" to "カレー","price" to "600") list.add(map) val from:Array<String> = arrayOf("name","price") val to:IntArray = intArrayOf(android.R.id.text1,android.R.id.text2 ) val adpter:SimpleAdapter= SimpleAdapter(this ,list,android.R.layout.simple_expandable_list_item_2,from,to) list1.adapter=adpter
アクティビティの起動とIntent
list1.setOnItemClickListener { adapterView, view, i, l -> val item:Map<String,String> = adapterView.getItemAtPosition(i) as Map<String, String> var intent:Intent=Intent(this,ThanksActivity::class.java) //javaのクラスはこのようにかく intent.putExtra("menuName",item["name"]) intent.putExtra("menuPrice",item["price"]) startActivity(intent) }
↓
val intent = getIntent() menu.text="あなたの注文は ${intent.getStringExtra("menuName")} で ${intent.getStringExtra("menuPrice")} 円です！"
intentの中身の確認
val intent = getIntent() val ban:Bundle?=intent.extras for (k in ban?.keySet()!!){ Log.d("TagName", "key=${k} val=${ban[k] as String}") }
第８回.Androidアプリのメニュー ～ オプションメニューとコンテキストメニュー
「戻る」メニュー
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
//この1行追加
supportActionBar?.setDisplayHomeAsUpEnabled(true)
}
override fun onOptionsItemSelected(item: MenuItem): Boolean {
val id = item.itemId
if(id == android.R.id.home) finish()
return super.onOptionsItemSelected(item)
}
第11回.Androidアプリでの非同期処理とWeb API連携
UIスレッド(mainスレッド)へのアクセス
E/AndroidRuntime: FATAL EXCEPTION: DefaultDispatcher-worker-1
Process: com.nekotype.ips.api, PID: 22804
android.view.ViewRootImpl$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.
↓
・・・
GlobalScope.launch {
val apidata = URL("http://weather.livedoor.com/forecast/webservice/json/v1?city=130010").readText()
async(Dispatchers.Main) { //UIスレッドでコルーチンを実行する
text.text=apidata
}
・・・
HTTPアクセスのパーミッション
E/AndroidRuntime: FATAL EXCEPTION: DefaultDispatcher-worker-1
Process: com.nekotype.ips.api, PID: 22981
java.io.IOException: Cleartext HTTP traffic to weather.livedoor.com not permitted
step1:xmlフォルダを作り、network_security_config.xmlを作成する。
- res/xml/network_security_config.xml
<?xml version="1.0" encoding="utf-8"?> <network-security-config> <domain-config cleartextTrafficPermitted="true"> <domain includeSubdomains="true">livedoor.com</domain> </domain-config> </network-security-config>
AndroidManifest.xmlに作成したnetwork_security_configへの参照を追加する。
- AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.nekotype.ips.api"> <uses-permission android:name="android.permission.INTERNET"/> <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/> <application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round" android:supportsRtl="true" android:theme="@style/AppTheme" android:networkSecurityConfig="@xml/network_security_config"> //←ここ <activity android:name=".ResultActivity"></activity> <activity android:name=".MainActivity"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>
HTTPSの証明書エラー
E/AndroidRuntime: FATAL EXCEPTION: DefaultDispatcher-worker-1
Process: com.nekotype.ips.api, PID: 23831
javax.net.ssl.SSLPeerUnverifiedException: Hostname weather.livedoor.com not verified:
証明書エラーを無視するようにしてみたが、なぜか301が帰ってきてしまう。
<html> <head><title>301 Moved Permanently</title></head> <body bgcolor="white"> <center><h1>301 Moved Permanently</h1></center> <hr><center>nginx</center> </body> </html>
一応やってみた２パターンの対応
証明証を無視するパターン１
fun myTask(id:String){
GlobalScope.launch {
disableSSLCertificateChecking() //証明書の無効処理呼び出し
val urlStr = "https://weather.livedoor.com/forecast/webservice/json/v1?city=${id}"
//val urlStr = "https://chargen-api.herokuapp.com/"
//val urlStr = "https://www.google.co.jp/"
val url= URL(urlStr)
val con=url.openConnection() as HttpsURLConnection
con.requestMethod="GET"
con.connect()
val stream=con.getInputStream()
val response=streamToString(stream)
async(Dispatchers.Main) {
text.text=response
}
}
}
private fun streamToString(stream: InputStream?): String {
val reader=BufferedReader(InputStreamReader(stream,"UTF-8"))
val sb=StringBuilder()
val b = CharArray(10240)
var line:Int
val result = reader.read(b).let { sb.append(b,0,it) }
return result.toString()
}
// 証明書の無効処理
@Throws(Exception::class)
fun disableSSLCertificateChecking() {
println("[WARN] *** SSLCertificate Checking DISABLED ***")
// ホスト名の検証を行わない
val hv = HostnameVerifier { s, ses ->
println("[WARN] *** HostnameVerifier DISABLED *** ")
true
}
HttpsURLConnection.setDefaultHostnameVerifier(hv)
// 証明書の検証を行わない
val km: Array<KeyManager>? = null
val tm = arrayOf<TrustManager>(object : X509TrustManager {
@Throws(CertificateException::class)
override fun checkClientTrusted(arg0: Array<X509Certificate>, arg1: String) {
}
@Throws(CertificateException::class)
override fun checkServerTrusted(arg0: Array<X509Certificate>, arg1: String) {
}
override fun getAcceptedIssuers(): Array<X509Certificate>? {
return null
}
})
val sslcontext = SSLContext.getInstance("SSL")
sslcontext.init(km, tm, SecureRandom())
HttpsURLConnection.setDefaultSSLSocketFactory(sslcontext.socketFactory)
}
証明書を無視するパターン２
色々試しているとそもそも動かなくなった…
// ↓
val tm = arrayOf<TrustManager>(object : X509TrustManager {
override fun getAcceptedIssuers(): Array<X509Certificate>? {
return null
}
override fun checkClientTrusted(xc: Array<X509Certificate>, type: String) {}
override fun checkServerTrusted(xc: Array<X509Certificate>, type: String) {}
})
val ctx = SSLContext.getInstance("SSL")
ctx.init(null, tm, SecureRandom())
// ↑
val urlStr = "https://weather.livedoor.com/forecast/webservice/json/v1?city=${id}"
val url= URL(urlStr)
val con=url.openConnection() as HttpsURLConnection
// ↓
con.doOutput = true
con.sslSocketFactory=ctx.socketFactory
// ↑
con.requestMethod="GET"
con.connect()
BufferedReaderのread
val reader=BufferedReader(InputStreamReader(stream,"UTF-8"))
val sb=StringBuilder()
val b = CharArray(10240)
var line:Int
// javaの場合は下。これはそのまま流用できな。
// while(0 <= {line = reader.read(b)}) {
// sb.append(b, 0, line);
// }
val result = reader.read(b).let { sb.append(b,0,it) }
return result.toString()
BufferedReaderが長すぎて読み込めない
read(b)をreadline()に修正
private fun streamToString(stream: InputStream?): String { val reader=BufferedReader(InputStreamReader(stream,"UTF-8")) val sb=StringBuilder() var line:Int val result = reader.readLine().let { sb.append(it) } return result.toString() }
詳細が画面に収まらないためスクロールさせる
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginBottom="10dp" android:gravity="center" android:text="@string/tv_winfo_title" android:textSize="25sp"/> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginBottom="10dp" android:orientation="horizontal"> <TextView android:id="@+id/tvCityName" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textSize="20sp"/> <TextView android:id="@+id/tvWeatherTelop" android:layout_width="0dp" android:layout_height="wrap_content" android:textSize="20sp" android:layout_weight="1"/> </LinearLayout> <!--TextViewをScrollViewで囲む--> <ScrollView android:layout_width="match_parent" android:layout_height="match_parent"> <TextView android:id="@+id/tvWeatherDesc" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginBottom="30dp" android:textSize="15sp"/> </ScrollView> </LinearLayout>
HTTPアクセスパターン１
val urlStr = "http://weather.livedoor.com/forecast/webservice/json/v1?city=${id}"
val url= URL(urlStr)
val con=url.openConnection() as HttpURLConnection
con.requestMethod="GET"
con.connect()
HTTPアクセスパターン２
val apidata = URL("http://weather.livedoor.com/forecast/webservice/json/v1?city=${id}").readText()
android/androidstudio2で始めるアプリ開発入門.1570920624.txt.gz · 最終更新: 2019/10/13 07:50 by ips
