質問編集履歴
2
コード、エラーメッセージの詳細を追加
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@@ -4,23 +4,80 @@
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### 発生している問題・エラーメッセージ
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エミュレータを立ち上げて確認しようとしていますが、
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開発中のアプリをエミュレータを立ち上げて確認しようとしていますが、以下のエラーによりアプリが落ちてしまい困っています。。
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```
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2020-04-09 18:32:37.189 23279-23279/com.example.abb E/AndroidRuntime: FATAL EXCEPTION: main
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Process: com.example.abb, PID: 23279
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java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.abb/com.example.abb.MainActivity}: java.lang.IllegalStateException: Method call should not happen from the main thread.
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at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3333)
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at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3477)
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at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83)
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at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
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at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
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at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2043)
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at android.os.Handler.dispatchMessage(Handler.java:106)
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at android.os.Looper.loop(Looper.java:216)
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at android.app.ActivityThread.main(ActivityThread.java:7464)
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at java.lang.reflect.Method.invoke(Native Method)
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at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:549)
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at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:955)
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Caused by: java.lang.IllegalStateException: Method call should not happen from the main thread.
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at com.squareup.picasso.Utils.checkNotMain(Utils.java:121)
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at com.squareup.picasso.RequestCreator.get(RequestCreator.java:416)
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at com.example.abb.MainActivity.onCreate(MainActivity.kt:28)
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at android.app.Activity.performCreate(Activity.java:7990)
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at android.app.Activity.performCreate(Activity.java:7979)
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at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1309)
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at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3308)
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at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3477)
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at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83)
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at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
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at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
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at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2043)
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at android.os.Handler.dispatchMessage(Handler.java:106)
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at android.os.Looper.loop(Looper.java:216)
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at android.app.ActivityThread.main(ActivityThread.java:7464)
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at java.lang.reflect.Method.invoke(Native Method)
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at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:549)
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at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:955)
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```
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### 該当のソースコード
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```kotlin
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class MainActivity : AppCompatActivity() {
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var drawable = BitmapDrawable(resources, bitmap)
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override fun onCreate(savedInstanceState: Bundle?) {
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super.onCreate(savedInstanceState)
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setContentView(R.layout.activity_main)
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var url = "http://i.imgur.com/DvpvklR.png"
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var bitmap: Bitmap = Picasso.get().load(url).get()
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var drawable = BitmapDrawable(resources, bitmap)
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val navView: BottomNavigationView = findViewById(R.id.nav_view)
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val navView: BottomNavigationView = findViewById(R.id.nav_view)
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var
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var a: Menu = navView.menu
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val
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val b: MenuItem = a.findItem(R.id.navigation_home)
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-
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b.setIcon(drawable)
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val navController = findNavController(R.id.nav_host_fragment)
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// Passing each menu ID as a set of Ids because each
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// menu should be considered as top level destinations.
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val appBarConfiguration = AppBarConfiguration(setOf(
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R.id.navigation_home, R.id.navigation_dashboard, R.id.navigation_notifications))
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setupActionBarWithNavController(navController, appBarConfiguration)
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navView.setupWithNavController(navController)
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}
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}
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```
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### 試したこと
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79
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23
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-
非同期制御が必要なのかと思い、runBlockingを使って試してみてましたがエ
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非同期制御が必要なのかと思い、runBlockingを使って試してみてましたが非同期処理の基礎を理解できていなくエラーが解消できずです。
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### 補足情報（FW/ツールのバージョンなど）
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26
83
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1
ソースコードを修正しました
title
CHANGED
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File without changes
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body
CHANGED
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@@ -10,6 +10,8 @@
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10
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```kotlin
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var bitmap: Bitmap = Picasso.get().load(url).get()
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var drawable = BitmapDrawable(resources, bitmap)
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+
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val navView: BottomNavigationView = findViewById(R.id.nav_view)
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var menu: Menu = navView.menu
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val item: MenuItem = menu.findItem(R.id.navigation_home)
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