Refactor: Move TileService startForegroundService() workaround to one

function

Bug: #1238

Author: zhanghai

app/src/main/java/me/zhanghai/android/files/compat/TileServiceCompat.kt

@@ -5,18 +5,56 @@
 
 package me.zhanghai.android.files.compat
 
+import android.graphics.PixelFormat
 import android.os.Build
 import android.os.IBinder
 import android.service.quicksettings.TileService
+import android.view.View
+import android.view.WindowManager
 import androidx.annotation.RequiresApi
+import androidx.core.view.doOnPreDraw
 import me.zhanghai.android.files.hiddenapi.RestrictedHiddenApi
 import me.zhanghai.android.files.util.lazyReflectedField
 
+fun TileService.doWithStartForegroundServiceAllowed(action: () -> Unit) {
+    if (Build.VERSION.SDK_INT != Build.VERSION_CODES.UPSIDE_DOWN_CAKE) {
+        action()
+        return
+    }
+    val windowManager = getSystemService(WindowManager::class.java)
+    val view = View(this)
+    val layoutParams =
+        WindowManager.LayoutParams().apply {
+            type = WindowManager_LayoutParams_TYPE_QS_DIALOG
+            format = PixelFormat.TRANSLUCENT
+            token = this@doWithStartForegroundServiceAllowed.token
+        }
+    windowManager.addView(view, layoutParams)
+    // We need to wait for WindowState.onSurfaceShownChanged(), basically when the first draw has
+    // finished and the surface is about to be shown to the user. However there's no good callback
+    // for that, while waiting for the second pre-draw seems to work.
+    view.doOnPreDraw {
+        view.post {
+            view.invalidate()
+            view.doOnPreDraw {
+                try {
+                    action()
+                } finally {
+                    windowManager.removeView(view)
+                }
+            }
+        }
+    }
+}
+
+private const val WindowManager_LayoutParams_TYPE_QS_DIALOG =
+    WindowManager.LayoutParams.FIRST_SYSTEM_WINDOW + 35
+
 @delegate:RequiresApi(Build.VERSION_CODES.N)
 @get:RequiresApi(Build.VERSION_CODES.N)
 @RestrictedHiddenApi
 private val tokenField by lazyReflectedField(TileService::class.qualifiedName!!, "mToken")
 
-val TileService.token: IBinder?
+private val TileService.token: IBinder?
     @RequiresApi(Build.VERSION_CODES.N)
     get() = tokenField.get(this) as IBinder?

app/src/main/java/me/zhanghai/android/files/compat/WindowManagerLayoutParamsCompat.kt

@@ -5,17 +5,12 @@
 
 package me.zhanghai.android.files.ftpserver
 
-import android.graphics.PixelFormat
 import android.os.Build
 import android.service.quicksettings.Tile
 import android.service.quicksettings.TileService
-import android.view.View
-import android.view.WindowManager
 import androidx.annotation.RequiresApi
-import androidx.core.view.doOnPreDraw
 import androidx.lifecycle.Observer
-import me.zhanghai.android.files.compat.WindowManagerLayoutParamsCompat
-import me.zhanghai.android.files.compat.token
+import me.zhanghai.android.files.compat.doWithStartForegroundServiceAllowed
 
 @RequiresApi(Build.VERSION_CODES.N)
 class FtpServerTileService : TileService() {
@@ -55,39 +50,6 @@ class FtpServerTileService : TileService() {
     }
 
     private fun toggle() {
-        if (Build.VERSION.SDK_INT == Build.VERSION_CODES.UPSIDE_DOWN_CAKE) {
-            runWithForegroundWindow { FtpServerService.toggle(this) }
-        } else {
-            FtpServerService.toggle(this)
-        }
-    }
-
-    // Work around https://issuetracker.google.com/issues/299506164 on U which is fixed in V.
-    @RequiresApi(Build.VERSION_CODES.UPSIDE_DOWN_CAKE)
-    private fun runWithForegroundWindow(block: () -> Unit) {
-        val windowManager = getSystemService(WindowManager::class.java)
-        val view = View(this)
-        val layoutParams =
-            WindowManager.LayoutParams().apply {
-                type = WindowManagerLayoutParamsCompat.TYPE_QS_DIALOG
-                format = PixelFormat.TRANSLUCENT
-                token = this@FtpServerTileService.token
-            }
-        windowManager.addView(view, layoutParams)
-        // We need to wait for WindowState.onSurfaceShownChanged(), basically when the first draw
-        // has finished and the surface is about to be shown to the user. However there's no good
-        // callback for that, while waiting for the second pre-draw seems to work.
-        view.doOnPreDraw {
-            view.post {
-                view.invalidate()
-                view.doOnPreDraw {
-                    try {
-                        block()
-                    } finally {
-                        windowManager.removeView(view)
-                    }
-                }
-            }
-        }
+        doWithStartForegroundServiceAllowed { FtpServerService.toggle(this) }
     }
 }