Android 从 MainActivity 向 class 发送数据

Question

i'm creating some Android app, where user add his data, and app will work with it. To work i need to write data to SomeClass.kt , from MainActivity.kt . I tried to do it with Intent, but it give null to me (I guess, if Intent dont get startActivity option, it will not send "putExtra" data. Or may be i write getIntent wrong, but it give data in second activity. So, the question is: How i can send data from MainActivity to SomeClassFile.kt? My codes:

MainActivity.kt :

...
val name = findViewById<EditText>(R.id.editTextTextPersonName)
val sname = findViewById<EditText>(R.id.editTextTextPassword)

val i = Intent(this@MainActivity, DataClass::class.java)
val bundle = Bundle()
            bundle.putString("login", name.toString())
            bundle.putString("email", sname)
            bundle.putString("test", "hello world")
            myIntent.putExtra("MyPackage", bundle)

...

DataClass.kt :

class DataClass {

    val callerIntent = intent // <-- Error is here, 'Unresolved reference: intent'
    val packageFromCaller = callerIntent.getBundleExtra("MyPackage")
    val contact = packageFromCaller!!.getString("login")
    val email = packageFromCaller!!.getString("email")
    val test = packageFromCaller!!.getString("test")

}

In another Activity, using same code as in DataClass.kt i got my text (two from EditText and "Hello world!")

Also, i can write my information to.txt file and try to get data in class from this.txt file, but when i try to open it in "class" file, i got an error with ''Unresolved reference: openFileInput''.

Answer 1

you need context or activity to get instance of "intent", but since you are using separate class you can go with this -

1. class DataClass(private val context: WeakReference<Context>) { val callerIntent get() = context.get()?.intent }

to make object of DataClass -

val dataClassX = DataClass(WeakReference(this@YOUR_ACTIVITY_CLASS_NAME))

where "this" is reference of your activity / or use getActivity() in fragments.