Added a dialog shown when the app doesn't have access to the vpn yet and an...

Added a dialog shown when the app doesn't have access to the vpn yet and an overlay seems to be active

Implements #143

app/src/main/java/com/frostnerd/smokescreen/fragment/MainFragment.kt

@@ -8,6 +8,7 @@ import android.net.Uri
 import android.net.VpnService
 import android.os.Bundle
 import android.view.LayoutInflater
+import android.view.MotionEvent
 import android.view.View
 import android.view.ViewGroup
 import android.view.animation.Animation
@@ -19,14 +20,11 @@ import androidx.appcompat.app.AppCompatActivity
 import androidx.fragment.app.Fragment
 import com.frostnerd.dnstunnelproxy.DnsServerInformation
 import com.frostnerd.general.service.isServiceRunning
-import com.frostnerd.smokescreen.R
+import com.frostnerd.smokescreen.*
 import com.frostnerd.smokescreen.activity.SpeedTestActivity
 import com.frostnerd.smokescreen.dialog.ServerChoosalDialog
-import com.frostnerd.smokescreen.getPreferences
-import com.frostnerd.smokescreen.registerLocalReceiver
 import com.frostnerd.smokescreen.service.Command
 import com.frostnerd.smokescreen.service.DnsVpnService
-import com.frostnerd.smokescreen.unregisterLocalReceiver
 import kotlinx.android.synthetic.main.fragment_main.*
 import kotlinx.coroutines.GlobalScope
 import kotlinx.coroutines.launch
@@ -80,6 +78,30 @@ class MainFragment : Fragment() {
             }
             updateVpnIndicators()
         }
+        startButton.setOnTouchListener { _, event ->
+            if(proxyRunning || proxyStarting) {
+                false
+            } else {
+                if(event.flags and MotionEvent.FLAG_WINDOW_IS_OBSCURED != 0) {
+                    if(event.action == MotionEvent.ACTION_UP) {
+                        if(VpnService.prepare(context!!) != null) {
+                            showInfoTextDialog(context!!,
+                                getString(R.string.dialog_overlaydetected_title),
+                                getString(R.string.dialog_overlaydetected_message),
+                                positiveButton = null,
+                                negativeButton = null,
+                                neutralButton = getString(android.R.string.ok) to { dialog, _ ->
+                                    dialog.dismiss()
+                                    startVpn()
+                                    proxyStarting = true
+                                }
+                            )
+                            true
+                        } else false
+                    } else false
+                }else false
+            }
+        }
         speedTest.setOnClickListener {
             startActivity(Intent(context!!, SpeedTestActivity::class.java))
         }

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

@@ -152,4 +152,7 @@
 
     <string name="dialog_servicekilled_message">The app detected that it wasn\'t stopped properly the last time it was active. This strongly indicates that your system chose to force stop the app without any possibility for the app to restart itself.\n\nOn most devices you have a few options to prevent or at least delay the system from stopping the app.\nYou can for example disable battery optimizations for the app in the system settings or avoid clearing the app from the list of recents.\n\nIf you chose to ignore this you won\'t see this dialog again. You can read more and receive tips for solving this with the button below (opens an external website in your browser).</string>
     <string name="dialog_servicekilled_more_info">More information</string>
+
+    <string name="dialog_overlaydetected_title">System-wide overlay detected</string>
+    <string name="dialog_overlaydetected_message">There seems to be a system-wide overlay (e.g. a chat bubble, color- or nightfilter) active. Most device don\'t allow you to enable a VPN in this case.\n\nIf you can\'t click OK in the next dialog please disable the overlay.</string>
 </resources>