import
android.app.Activity
import
android.os.Build
import
android.os.Bundle
import
android.widget.Toast
import
androidx.activity.ComponentActivity
import
androidx.activity.compose.setContent
import
androidx.annotation.RequiresApi
import
androidx.compose.foundation.layout.*
import
androidx.compose.material.*
import
androidx.compose.runtime.Composable
import
androidx.compose.ui.Alignment
import
androidx.compose.ui.Modifier
import
androidx.compose.ui.graphics.Color
import
androidx.compose.ui.platform.LocalContext
import
androidx.compose.ui.text.font.FontWeight
import
androidx.compose.ui.text.style.TextAlign
import
androidx.compose.ui.unit.dp
import
androidx.compose.ui.unit.sp
import
com.example.newcanaryproject.ui.theme.NewCanaryProjectTheme
import
com.example.newcanaryproject.ui.theme.greenColor
class
MainActivity : ComponentActivity() {
@RequiresApi
(Build.VERSION_CODES.M)
private
var pressedTime: Long =
0
override fun onCreate(savedInstanceState: Bundle?) {
super
.onCreate(savedInstanceState)
setContent {
NewCanaryProjectTheme {
Surface(
modifier = Modifier.fillMaxSize(), color = MaterialTheme.colors.background
) {
Scaffold(
topBar = {
TopAppBar(backgroundColor = greenColor,
title = {
Text(
text =
"GFG"
,
modifier = Modifier.fillMaxWidth(),
textAlign = TextAlign.Center,
color = Color.White
)
})
}) {
pressBackAgainToExit()
}
}
}
}
}
@RequiresApi
(Build.VERSION_CODES.M)
override fun onBackPressed() {
if
(pressedTime +
2000
> System.currentTimeMillis()) {
super
.onBackPressed()
finish()
}
else
{
Toast.makeText(getBaseContext(),
"Press back again to exit"
, Toast.LENGTH_SHORT).show();
}
pressedTime = System.currentTimeMillis();
}
}
@Composable
fun pressBackAgainToExit() {
val activity = LocalContext.current as Activity
Column(
modifier = Modifier
.fillMaxSize()
.padding(all =
30
.dp),
horizontalAlignment = Alignment.CenterHorizontally,
verticalArrangement = Arrangement.Center,
) {
Text(
text =
"Press Back Again to Exit in Android"
,
color = greenColor, fontSize =
20
.sp, fontWeight = FontWeight.Bold
)
}
}