add a option to lock OwnDroid when it is switched to background

app/src/main/java/com/bintianqi/owndroid/Auth.kt

@@ -7,7 +7,6 @@ import android.util.Log
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
-import android.widget.FrameLayout
 import androidx.biometric.BiometricManager
 import androidx.biometric.BiometricPrompt
 import androidx.biometric.BiometricPrompt.AuthenticationCallback
@@ -19,7 +18,10 @@ import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.material3.Button
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Text
-import androidx.compose.runtime.*
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.MutableState
+import androidx.compose.runtime.mutableStateOf
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.platform.ComposeView
@@ -28,7 +30,9 @@ import androidx.core.content.ContextCompat
 import androidx.fragment.app.Fragment
 import androidx.lifecycle.lifecycleScope
 import com.bintianqi.owndroid.ui.theme.OwnDroidTheme
-import kotlinx.coroutines.*
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.launch
 
 class AuthFragment: Fragment() {
     @SuppressLint("UnrememberedMutableState")
@@ -40,13 +44,7 @@ class AuthFragment: Fragment() {
             val fragmentManager = this.parentFragmentManager
             val transaction = fragmentManager.beginTransaction()
             transaction.setCustomAnimations(R.anim.enter, R.anim.exit)
-            transaction.add(R.id.base, homeFragment)
-            requireActivity().findViewById<FrameLayout>(R.id.base).bringChildToFront(homeFragment.view)
-            transaction.commit()
-            lifecycleScope.launch {
-                delay(500)
-                fragmentManager.beginTransaction().remove(this@AuthFragment).commit()
-            }
+            transaction.remove(this@AuthFragment).commit()
         }
         val promptInfo = Builder()
             .setTitle(context.getText(R.string.authenticate))
@@ -110,6 +108,7 @@ fun Auth(activity: Fragment, promptInfo: Builder, callback: AuthenticationCallba
             color = MaterialTheme.colorScheme.onBackground
         )
         LaunchedEffect(Unit){
+            delay(300)
             startAuth(activity, promptInfo, callback)
             canStartAuth.value = false
         }

app/src/main/java/com/bintianqi/owndroid/MainActivity.kt

@@ -48,11 +48,10 @@ import com.bintianqi.owndroid.ui.theme.OwnDroidTheme
 import kotlinx.coroutines.delay
 import java.util.Locale
 
-val homeFragment = HomeFragment()
-
 var backToHome = false
 @ExperimentalMaterial3Api
 class MainActivity : FragmentActivity() {
+    private var auth = false
     @SuppressLint("UnrememberedMutableState")
     override fun onCreate(savedInstanceState: Bundle?) {
         registerActivityResult(this)
@@ -63,15 +62,39 @@ class MainActivity : FragmentActivity() {
         val sharedPref = applicationContext.getSharedPreferences("data", Context.MODE_PRIVATE)
         val fragmentManager = supportFragmentManager
         val transaction = fragmentManager.beginTransaction()
+        transaction.add(R.id.base, HomeFragment(), "home")
         if(sharedPref.getBoolean("auth", false)){
             transaction.add(R.id.base, AuthFragment(), "auth")
-        }else{
-            transaction.add(R.id.base, homeFragment, "home")
         }
         transaction.commit()
         val locale = applicationContext.resources?.configuration?.locale
         zhCN = locale==Locale.SIMPLIFIED_CHINESE||locale==Locale.CHINESE||locale==Locale.CHINA
     }
+
+    override fun onResume() {
+        super.onResume()
+        if(auth){
+            val sharedPref = applicationContext.getSharedPreferences("data", Context.MODE_PRIVATE)
+            if(
+                sharedPref.getBoolean("auth", false) &&
+                sharedPref.getBoolean("lock_in_background", false)
+            ){
+                val fragmentManager = supportFragmentManager
+                val fragment = fragmentManager.findFragmentByTag("auth")
+                if(fragment == null){
+                    val transaction = fragmentManager.beginTransaction()
+                    transaction.setCustomAnimations(R.anim.enter, R.anim.exit)
+                    transaction.add(R.id.base, AuthFragment(), "auth").commit()
+                }
+            }
+            auth = false
+        }
+    }
+
+    override fun onRestart() {
+        super.onRestart()
+        auth = true
+    }
 }
 
 class HomeFragment: Fragment() {

app/src/main/java/com/bintianqi/owndroid/Setting.kt

@@ -111,6 +111,11 @@ private fun AuthSettings(){
                 { sharedPref.getBoolean("bio_auth",false) },
                 { sharedPref.edit().putBoolean("bio_auth",it).apply() }
             )
+            SwitchItem(
+                R.string.lock_in_background, "", null,
+                { sharedPref.getBoolean("lock_in_background",false) },
+                { sharedPref.edit().putBoolean("lock_in_background",it).apply() }
+            )
         }
         Box(modifier = Modifier.padding(horizontal = 8.dp)){
             Information {