Update app install state after user comes back from manually installing an app

This way, the list of failed apps ideally keeps shrinking, allowing the user to see which apps are still left in a failed state.

app/src/main/java/com/stevesoltys/seedvault/restore/install/ApkInstaller.kt

@@ -59,6 +59,8 @@ internal class ApkInstaller(private val context: Context) {
     private fun install(cachedApk: File, installerPackageName: String?) {
         val sessionParams = SessionParams(MODE_FULL_INSTALL).apply {
             setInstallerPackageName(installerPackageName)
+            // Setting the INSTALL_ALLOW_TEST flag here does not allow us to install test apps,
+            // because the flag is filtered out by PackageInstallerService.
         }
         // Don't set more sessionParams intentionally here.
         // We saw strange permission issues when doing setInstallReason() or setting installFlags.

app/src/main/java/com/stevesoltys/seedvault/restore/install/InstallIntentCreator.kt

@@ -3,7 +3,6 @@ package com.stevesoltys.seedvault.restore.install
 import android.content.Intent
 import android.content.Intent.ACTION_VIEW
 import android.content.Intent.FLAG_ACTIVITY_CLEAR_TOP
-import android.content.Intent.FLAG_ACTIVITY_NEW_TASK
 import android.content.Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED
 import android.content.pm.PackageManager
 import android.net.Uri
@@ -23,7 +22,7 @@ internal class InstallIntentCreator(
 
     fun getIntent(packageName: CharSequence, installerPackageName: CharSequence?): Intent {
         val i = Intent(ACTION_VIEW, Uri.parse("market://details?id=$packageName")).apply {
-            addFlags(FLAG_ACTIVITY_NEW_TASK)
+            // Not using FLAG_ACTIVITY_NEW_TASK, so startActivityForResult works
             addFlags(FLAG_ACTIVITY_CLEAR_TOP)
             addFlags(FLAG_ACTIVITY_RESET_TASK_IF_NEEDED)
         }
@@ -39,14 +38,18 @@ internal class InstallIntentCreator(
         if (installerPackageName == null) return null
         val packageName = installerToPackage[installerPackageName] ?: return null
         val isInstalled = isPackageInstalled.getOrPut(packageName) {
-            try {
-                packageManager.getPackageInfo(packageName, 0)
-                true
-            } catch (e: PackageManager.NameNotFoundException) {
-                false
-            }
+            packageManager.isInstalled(packageName)
         }
         return if (isInstalled) packageName else null
     }
 
 }
+
+fun PackageManager.isInstalled(packageName: String): Boolean {
+    return try {
+        getPackageInfo(packageName, 0)
+        true
+    } catch (e: PackageManager.NameNotFoundException) {
+        false
+    }
+}

app/src/main/java/com/stevesoltys/seedvault/restore/install/InstallProgressFragment.kt

@@ -1,5 +1,7 @@
 package com.stevesoltys.seedvault.restore.install
 
+import android.content.Context
+import android.content.Intent
 import android.os.Bundle
 import android.view.LayoutInflater
 import android.view.View
@@ -7,6 +9,7 @@ import android.view.ViewGroup
 import android.widget.Button
 import android.widget.ProgressBar
 import android.widget.TextView
+import androidx.activity.result.contract.ActivityResultContract
 import androidx.appcompat.app.AlertDialog
 import androidx.fragment.app.Fragment
 import androidx.lifecycle.Observer
@@ -115,9 +118,33 @@ class InstallProgressFragment : Fragment(), InstallItemListener {
     }
 
     override fun onFailedItemClicked(item: ApkInstallResult) {
-        val i =
-            viewModel.installIntentCreator.getIntent(item.packageName, item.installerPackageName)
-        startActivity(i)
+        installAppLauncher.launch(item)
+    }
+
+    private val installAppLauncher = registerForActivityResult(InstallApp()) { packageName ->
+        val result = viewModel.installResult.value ?: return@registerForActivityResult
+        if (result.isFinished) {
+            val changed = result.reCheckFailedPackage(
+                requireContext().packageManager,
+                packageName.toString()
+            )
+            if (changed) adapter.update(result.getNotQueued())
+        }
+    }
+
+    private inner class InstallApp : ActivityResultContract<ApkInstallResult, CharSequence>() {
+        private lateinit var packageName: CharSequence
+        override fun createIntent(context: Context, input: ApkInstallResult): Intent {
+            packageName = input.packageName
+            return viewModel.installIntentCreator.getIntent(
+                input.packageName,
+                input.installerPackageName
+            )
+        }
+
+        override fun parseResult(resultCode: Int, intent: Intent?): CharSequence {
+            return packageName
+        }
     }
 
 }

app/src/main/java/com/stevesoltys/seedvault/restore/install/InstallResult.kt

@@ -1,9 +1,11 @@
 package com.stevesoltys.seedvault.restore.install
 
+import android.content.pm.PackageManager
 import android.graphics.drawable.Drawable
 import com.stevesoltys.seedvault.restore.install.ApkInstallState.FAILED
 import com.stevesoltys.seedvault.restore.install.ApkInstallState.IN_PROGRESS
 import com.stevesoltys.seedvault.restore.install.ApkInstallState.QUEUED
+import com.stevesoltys.seedvault.restore.install.ApkInstallState.SUCCEEDED
 import java.util.concurrent.ConcurrentHashMap
 
 internal interface InstallResult {
@@ -45,6 +47,12 @@ internal interface InstallResult {
      * and we need to treat all packages as failed that haven't been processed.
      */
     fun queuedToFailed()
+
+    /**
+     * Once [isFinished] is true, this can be called to re-check a package in state [FAILED].
+     * If it is now installed, the state will be changed to [SUCCEEDED] and true returned.
+     */
+    fun reCheckFailedPackage(pm: PackageManager, packageName: String): Boolean
 }
 
 internal class MutableInstallResult(override val total: Int) : InstallResult {
@@ -89,6 +97,15 @@ internal class MutableInstallResult(override val total: Int) : InstallResult {
         return this
     }
 
+    override fun reCheckFailedPackage(pm: PackageManager, packageName: String): Boolean {
+        check(isFinished) { "re-checking failed packages only allowed when finished" }
+        if (pm.isInstalled(packageName)) {
+            update(packageName) { it.copy(state = SUCCEEDED) }
+            return true
+        }
+        return false
+    }
+
 }
 
 data class ApkInstallResult(