Android 由意图引起的非法状态例外?
我有时在我的应用程序中发现java.lang.IllegalStateException:Android 由意图引起的非法状态例外?,android,kotlin,illegalstateexception,Android,Kotlin,Illegalstateexception,我有时在我的应用程序中发现java.lang.IllegalStateException: java.lang.RuntimeException: at android.app.ActivityThread.performLaunchActivity (ActivityThread.java:2825) at android.app.ActivityThread.handleLaunchActivity (ActivityThread.java:2886) at android.a
java.lang.RuntimeException:
at android.app.ActivityThread.performLaunchActivity (ActivityThread.java:2825)
at android.app.ActivityThread.handleLaunchActivity (ActivityThread.java:2886)
at android.app.ActivityThread.-wrap12 (ActivityThread.java)
at android.app.ActivityThread$H.handleMessage (ActivityThread.java:1623)
at android.os.Handler.dispatchMessage (Handler.java:102)
at android.os.Looper.loop (Looper.java:186)
at android.app.ActivityThread.main (ActivityThread.java:6509)
at java.lang.reflect.Method.invoke (Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run (ZygoteInit.java:914)
at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:804)
Caused by: java.lang.IllegalStateException:
at com.****.onCreate (***.kt:35) <-- here is the Intent.getStringExtra(..)
at android.app.Activity.performCreate (Activity.java:6992)
at android.app.Instrumentation.callActivityOnCreate (Instrumentation.java:1119)
at android.app.ActivityThread.performLaunchActivity (ActivityThread.java:2778)
java.lang.RuntimeException:
位于android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2825)
位于android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2886)
位于android.app.ActivityThread.-wrap12(ActivityThread.java)
在android.app.ActivityThread$H.handleMessage(ActivityThread.java:1623)
位于android.os.Handler.dispatchMessage(Handler.java:102)
位于android.os.Looper.loop(Looper.java:186)
位于android.app.ActivityThread.main(ActivityThread.java:6509)
位于java.lang.reflect.Method.invoke(本机方法)
在com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run上(ZygoteInit.java:914)
位于com.android.internal.os.ZygoteInit.main(ZygoteInit.java:804)
原因:java.lang.IllegalStateException:
在com.**.onCreate(***.kt:35)上使用这些检查以确保密钥可用
if (intent.hasExtra("articleImg")) {
mArticleImg = intent.getStringExtra( "articleImg" )
}
if (intent.hasExtra("data")) {
mArticle = intent.getParcelableExtra("data")
}
您可以使用elvis运算符?:
val intent : Intent = this.intent
mArticleImg = intent.getStringExtra("articleImg") ?: "null-value-fallback"
mArticle = intent.getParcelableExtra("data") ?: "null-value-fallback"
或者仅当值不为空时设置该值,例如使用if
或。让{..}
:
val intent : Intent = this.intent
intent.getStringExtra("articleImg")?.let { mArticleImg = it }
intent.getParcelableExtra("data")?.let { mArticle = it }
mArticleImg字段不接受空值。使用字符串?键入以允许或添加?:“null value”在GetStringExtral调用后提供一个回退值,将查看它。MARTICLIMG本身不应为空。共享您的startActivity代码如果是这种情况,他为什么会获得非法状态异常?很难说没有异常消息文本
val intent : Intent = this.intent
intent.getStringExtra("articleImg")?.let { mArticleImg = it }
intent.getParcelableExtra("data")?.let { mArticle = it }
Step 1: In the Button Click and Putting String Through Intent... as below
ll_Admin_Milk.setOnClickListener(View.OnClickListener {
val intent = Intent(this, EggAndMilkActivity::class.java)
intent.putExtra("Eggs","Eggs")
intent.putExtra("Milk","Milk")
startActivity(intent)
})
Step 2: In the EggAndMilkActivity.Class i am Getting the intent value as below....
val intent : Intent = this.intent
intent.getStringExtra("Eggs")?.let { Eggs = it }
intent.getStringExtra("Milk")?.let { Milk= it }
Step 3: Do not Forget to add this line of Code **?.let { Eggs = it }** other wise you will get illegalArgumentException..
-Happy Coding @Ambilpura