Large tests: Make compatible with API 27

uhabits-android/src/androidTest/java/org/isoron/uhabits/BaseUserInterfaceTest.kt

@@ -56,7 +56,8 @@ open class BaseUserInterfaceTest {
     @After
     @Throws(Exception::class)
     fun tearDown() {
-        for (i in 0..9) device.pressBack()
+        device.pressBack()
+        device.pressBack()
     }
 
     @Throws(Exception::class)

uhabits-android/src/androidTest/java/org/isoron/uhabits/acceptance/steps/BackupSteps.kt

@@ -19,9 +19,11 @@
 
 package org.isoron.uhabits.acceptance.steps
 
+import android.os.Build.VERSION.SDK_INT
 import androidx.test.uiautomator.UiSelector
 import org.isoron.uhabits.BaseUserInterfaceTest.Companion.device
 import org.isoron.uhabits.acceptance.steps.CommonSteps.clickText
+import org.isoron.uhabits.acceptance.steps.CommonSteps.pressBack
 import org.isoron.uhabits.acceptance.steps.ListHabitsSteps.MenuItem.SETTINGS
 import org.isoron.uhabits.acceptance.steps.ListHabitsSteps.clickMenu
 
@@ -31,7 +33,8 @@ const val DOWNLOAD_FOLDER = "/sdcard/Download/"
 fun exportFullBackup() {
     clickMenu(SETTINGS)
     clickText("Export full backup")
-    device.pressBack()
+    if (SDK_INT < 28) return
+    pressBack()
 }
 
 fun clearDownloadFolder() {

uhabits-android/src/androidTest/java/org/isoron/uhabits/acceptance/steps/CommonSteps.kt

@@ -120,10 +120,12 @@ object CommonSteps : BaseUserInterfaceTest() {
     private fun verifyDisplaysView(className: String) {
         Espresso.onView(ViewMatchers.withClassName(CoreMatchers.endsWith(className)))
             .check(ViewAssertions.matches(ViewMatchers.isEnabled()))
+        device.waitForIdle()
     }
 
     fun verifyDoesNotDisplayText(text: String?) {
         Espresso.onView(ViewMatchers.withText(text)).check(ViewAssertions.doesNotExist())
+        device.waitForIdle()
     }
 
     @Throws(Exception::class)

uhabits-android/src/main/java/org/isoron/uhabits/utils/ViewExtensions.kt

@@ -110,7 +110,7 @@ fun Activity.showMessage(msg: String) {
 fun Activity.showSendFileScreen(archiveFilename: String) {
     val file = File(archiveFilename)
     val fileUri = FileProvider.getUriForFile(this, "org.isoron.uhabits", file)
-    this.startActivity(
+    this.startActivitySafely(
         Intent().apply {
             action = Intent.ACTION_SEND
             type = "application/zip"