Initial adding bottom navigation

app/src/main/java/org/koitharu/kotatsu/utils/InternalResourceHelper.kt

@@ -0,0 +1,27 @@
+package org.koitharu.kotatsu.utils
+
+import android.content.Context
+import android.content.res.Resources
+
+object InternalResourceHelper {
+
+	fun getBoolean(context: Context, resName: String, defaultValue: Boolean): Boolean {
+		val id = getResourceId(resName, "bool")
+		return if (id != 0) {
+			context.createPackageContext("android", 0).resources.getBoolean(id)
+		} else {
+			defaultValue
+		}
+	}
+
+	/**
+	 * Get resource id from system resources
+	 * @param resName resource name to get
+	 * @param type resource type of [resName] to get
+	 * @return 0 if not available
+	 */
+	private fun getResourceId(resName: String, type: String): Int {
+		return Resources.getSystem().getIdentifier(resName, type, "android")
+	}
+
+}

app/src/main/java/org/koitharu/kotatsu/utils/ext/AndroidExt.kt

@@ -2,19 +2,23 @@ package org.koitharu.kotatsu.utils.ext
 
 import android.content.Context
 import android.content.pm.ResolveInfo
+import android.graphics.Color
 import android.net.ConnectivityManager
 import android.net.Network
 import android.net.NetworkRequest
 import android.net.Uri
 import android.os.Build
+import android.view.Window
 import androidx.activity.result.ActivityResultLauncher
 import androidx.core.app.ActivityOptionsCompat
 import androidx.lifecycle.Lifecycle
 import androidx.lifecycle.coroutineScope
 import androidx.work.CoroutineWorker
+import com.google.android.material.elevation.ElevationOverlayProvider
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.suspendCancellableCoroutine
+import org.koitharu.kotatsu.utils.InternalResourceHelper
 import kotlin.coroutines.resume
 
 val Context.connectivityManager: ConnectivityManager
@@ -66,4 +70,18 @@ fun Lifecycle.postDelayed(runnable: Runnable, delay: Long) {
 		delay(delay)
 		runnable.run()
 	}
+}
+
+fun Window.setNavigationBarTransparentCompat(context: Context, elevation: Float = 0F) {
+	navigationBarColor = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q &&
+		!InternalResourceHelper.getBoolean(context, "config_navBarNeedsScrim", true)
+	) {
+		Color.TRANSPARENT
+	} else {
+		// Set navbar scrim 70% of navigationBarColor
+		ElevationOverlayProvider(context).compositeOverlayIfNeeded(
+			context.getResourceColor(android.R.attr.navigationBarColor, 0.7F),
+			elevation,
+		)
+	}
 }

app/src/main/java/org/koitharu/kotatsu/utils/ext/ResourcesExt.kt

@@ -1,11 +1,33 @@
 package org.koitharu.kotatsu.utils.ext
 
+import android.content.Context
 import android.content.res.Resources
+import android.graphics.Color
+import androidx.annotation.AttrRes
+import androidx.annotation.ColorInt
 import androidx.annotation.Px
+import androidx.core.graphics.alpha
+import androidx.core.graphics.blue
+import androidx.core.graphics.green
+import androidx.core.graphics.red
 import kotlin.math.roundToInt
 
 @Px
 fun Resources.resolveDp(dp: Int) = (dp * displayMetrics.density).roundToInt()
 
 @Px
-fun Resources.resolveDp(dp: Float) = dp * displayMetrics.density
+fun Resources.resolveDp(dp: Float) = dp * displayMetrics.density
+
+@ColorInt
+fun Context.getResourceColor(@AttrRes resource: Int, alphaFactor: Float = 1f): Int {
+	val typedArray = obtainStyledAttributes(intArrayOf(resource))
+	val color = typedArray.getColor(0, 0)
+	typedArray.recycle()
+
+	if (alphaFactor < 1f) {
+		val alpha = (color.alpha * alphaFactor).roundToInt()
+		return Color.argb(alpha, color.red, color.green, color.blue)
+	}
+
+	return color
+}