主题设置中增加导航栏阴影设置

app/src/main/java/io/legado/app/help/AppConfig.kt

@@ -111,4 +111,9 @@ object AppConfig {
             App.INSTANCE.putPrefBoolean("bookGroupAudio", value)
         }
 
+    var elevation: Int
+        get() = App.INSTANCE.getPrefInt("elevation", -1)
+        set(value) {
+            App.INSTANCE.putPrefInt("elevation", value)
+        }
 }

app/src/main/java/io/legado/app/lib/theme/ATHUtils.kt

@@ -19,4 +19,16 @@ object ATHUtils {
             a.recycle()
         }
     }
+
+    @JvmOverloads
+    fun resolveFloat(context: Context, @AttrRes attr: Int, fallback: Float = 0.0f): Float {
+        val a = context.theme.obtainStyledAttributes(intArrayOf(attr))
+        return try {
+            a.getFloat(0, fallback)
+        } catch (e: Exception) {
+            fallback
+        } finally {
+            a.recycle()
+        }
+    }
 }

app/src/main/java/io/legado/app/lib/theme/MaterialValueHelper.kt

@@ -107,4 +107,7 @@ val Context.isDarkTheme: Boolean
     get() = ColorUtils.isColorLight(ThemeStore.primaryColor(this))
 
 val Fragment.isDarkTheme: Boolean
-    get() = requireContext().isDarkTheme
+    get() = requireContext().isDarkTheme
+
+val Context.elevation: Float
+    get() = ThemeStore.elevation(this)

app/src/main/java/io/legado/app/lib/theme/ThemeStore.kt

@@ -284,6 +284,14 @@ private constructor(private val mContext: Context) : ThemeStoreInterface {
             )
         }
 
+        @CheckResult
+        fun elevation(context: Context): Float {
+            return prefs(context).getFloat(
+                ThemeStorePrefKeys.KEY_ELEVATION,
+                ATHUtils.resolveFloat(context, android.R.attr.elevation, context.resources.getDimension(R.dimen.design_appbar_elevation))
+            )
+        }
+
         @CheckResult
         @ColorInt
         fun bottomBackground(context: Context): Int {

app/src/main/java/io/legado/app/lib/theme/ThemeStorePrefKeys.kt

@@ -27,4 +27,6 @@ object ThemeStorePrefKeys {
         const val KEY_APPLY_PRIMARYDARK_STATUSBAR = "apply_primarydark_statusbar"
         const val KEY_APPLY_PRIMARY_NAVBAR = "apply_primary_navbar"
         const val KEY_AUTO_GENERATE_PRIMARYDARK = "auto_generate_primarydark"
+
+        const val KEY_ELEVATION = "elevation"
 }

app/src/main/java/io/legado/app/ui/config/ThemeConfigFragment.kt

@@ -16,6 +16,8 @@ import io.legado.app.lib.dialogs.noButton
 import io.legado.app.lib.dialogs.yesButton
 import io.legado.app.lib.theme.ATH
 import io.legado.app.lib.theme.ColorUtils
+import io.legado.app.lib.theme.elevation
+import io.legado.app.ui.widget.number.NumberPickerDialog
 import io.legado.app.utils.*
 
 
@@ -25,6 +27,7 @@ class ThemeConfigFragment : PreferenceFragmentCompat(), SharedPreferences.OnShar
 
     override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
         addPreferencesFromResource(R.xml.pref_config_theme)
+        upPreferenceSummary("barElevation", AppConfig.elevation.toString())
     }
 
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
@@ -145,6 +148,19 @@ class ThemeConfigFragment : PreferenceFragmentCompat(), SharedPreferences.OnShar
                     recreateActivities()
                 }
             }.show().applyTint()
+            "barElevation" -> NumberPickerDialog(requireContext())
+                .setTitle(getString(R.string.bar_elevation))
+                .setMaxValue(32)
+                .setMinValue(0)
+                .setValue(AppConfig.elevation)
+                .setCustomButton((R.string.btn_default_s)) {
+                    AppConfig.elevation = App.INSTANCE.resources.getDimension(R.dimen.design_appbar_elevation).toInt()
+                    recreateActivities()
+                }
+                .show {
+                    AppConfig.elevation = it
+                    recreateActivities()
+                }
         }
         return super.onPreferenceTreeClick(preference)
     }
@@ -180,4 +196,10 @@ class ThemeConfigFragment : PreferenceFragmentCompat(), SharedPreferences.OnShar
         postEvent(EventBus.RECREATE, "")
     }
 
+    private fun upPreferenceSummary(preferenceKey: String, value: String?) {
+        val preference = findPreference<Preference>(preferenceKey) ?: return
+        when (preferenceKey) {
+            "barElevation" -> preference.summary = getString(R.string.bar_elevation_s, value)
+        }
+    }
 }

app/src/main/java/io/legado/app/ui/widget/TitleBar.kt

@@ -10,6 +10,8 @@ import androidx.annotation.StyleRes
 import androidx.appcompat.widget.Toolbar
 import com.google.android.material.appbar.AppBarLayout
 import io.legado.app.R
+import io.legado.app.help.AppConfig
+import io.legado.app.lib.theme.elevation
 import io.legado.app.lib.theme.primaryColor
 import io.legado.app.utils.activity
 import io.legado.app.utils.navigationBarHeight
@@ -140,6 +142,13 @@ class TitleBar(context: Context, attrs: AttributeSet?) : AppBarLayout(context, a
         }
 
         backgroundColor = context.primaryColor
+        // targetElevation = context.elevation
+        stateListAnimator = null
+        if (AppConfig.elevation < 0) {
+            elevation = context.elevation
+        } else {
+            elevation = AppConfig.elevation.toFloat()
+        }
 
         a.recycle()
     }

app/src/main/java/io/legado/app/ui/widget/number/NumberPickerDialog.kt

@@ -40,6 +40,17 @@ class NumberPickerDialog(context: Context) {
         return this
     }
 
+    fun setCustomButton(textId: Int, listener: (() -> Unit)?): NumberPickerDialog {
+        builder.setNeutralButton(textId) { _, _ ->
+            numberPicker?.let {
+                it.clearFocus()
+                it.hideSoftInput()
+                listener?.invoke()
+            }
+        }
+        return this;
+    }
+
     fun show(callBack: ((value: Int) -> Unit)?) {
         builder.setPositiveButton(R.string.ok) { _, _ ->
             numberPicker?.let {

app/src/main/res/values/strings.xml

@@ -643,4 +643,7 @@
     <string name="no_default_path">没有默认路径</string>
     <string name="change_group">设置分组</string>
     <string name="view_toc">查看目录</string>
+    <string name="bar_elevation">导航栏阴影</string>
+    <string name="bar_elevation_s">当前阴影大小(elevation): %s</string>
+    <string name="btn_default_s">默认</string>
 </resources>

app/src/main/res/xml/pref_config_theme.xml

@@ -26,6 +26,13 @@
         android:title="@string/navigation_bar_color_change"
         app:iconSpaceReserved="false" />
 
+    <androidx.preference.Preference
+        android:defaultValue="true"
+        android:key="barElevation"
+        android:summary="@string/bar_elevation_s"
+        android:title="@string/bar_elevation"
+        app:iconSpaceReserved="false" />
+
     <androidx.preference.Preference
         android:key="defaultTheme"
         android:summary="@string/restore_default_theme"