需要Kotlin的Android帮助吗
SignupActivity.kt需要Kotlin的Android帮助吗,android,kotlin,kotlin-android-extensions,Android,Kotlin,Kotlin Android Extensions,SignupActivity.kt import android.os.Bundle import android.support.v7.app.AppCompatActivity import android.widget.EditText import android.widget.Toast import kotlinx.android.synthetic.main.activity_signup.* class SignupActivity:AppCompatActivity(){
import android.os.Bundle
import android.support.v7.app.AppCompatActivity
import android.widget.EditText
import android.widget.Toast
import kotlinx.android.synthetic.main.activity_signup.*
class SignupActivity:AppCompatActivity(){
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_signup)
val signname =findViewById<EditText>(R.id.signNameTxt)
val s=signname!!.text.toString()
fun validate(){
if(s.isNotEmpty()){
Toast.makeText(this,"Working :)",Toast.LENGTH_SHORT).show()
}
else{
Toast.makeText(this,"Not Working :(",Toast.LENGTH_SHORT).show()
}
}
signNxtBtn.setOnClickListener{
validate()
}
}
public override fun onDestroy() {
super.onDestroy()
}
}
在这部分代码中,无论我是否在文本字段中输入任何值,应用程序都会返回else部分。您读取edittext值的时间太早了。移动
val s=signname!!.text.toString()
在
validate()
函数中。读取edittext值太早。移动
val s=signname!!.text.toString()
在validate()函数中。**
像这样使用代码
**
**
像这样使用代码
**
if(signname!!.text.isNotEmpty()){…
if(signname!!.text.isNotEmpty()){…
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
val s = tvDisplay.text.toString()
btnOk.setOnClickListener {
validate(s)
}
}
private fun validate(s:String) {
if(s.isNotEmpty()){
Toast.makeText(this,"Working :)",Toast.LENGTH_SHORT).show()
}
else{
Toast.makeText(this,"Not Working :(",Toast.LENGTH_SHORT).show()
}
} }