added option and prompt to opt out/in of Firebase analytics

app/src/main/java/io/github/sds100/keymapper/activity/HomeActivity.kt

@@ -15,8 +15,10 @@ import android.view.View
 import androidx.annotation.ColorRes
 import androidx.annotation.RequiresApi
 import androidx.appcompat.app.AppCompatActivity
+import androidx.core.content.edit
 import androidx.lifecycle.Observer
 import androidx.recyclerview.widget.LinearLayoutManager
+import com.google.firebase.analytics.FirebaseAnalytics
 import com.google.gson.Gson
 import io.github.sds100.keymapper.BuildConfig
 import io.github.sds100.keymapper.KeyMap
@@ -34,10 +36,7 @@ import io.github.sds100.keymapper.service.MyIMEService
 import io.github.sds100.keymapper.util.*
 import kotlinx.android.synthetic.main.activity_home.*
 import kotlinx.android.synthetic.main.content_home.*
-import org.jetbrains.anko.append
-import org.jetbrains.anko.defaultSharedPreferences
-import org.jetbrains.anko.doAsync
-import org.jetbrains.anko.uiThread
+import org.jetbrains.anko.*
 
 class HomeActivity : AppCompatActivity(), SelectionCallback,
         OnItemClickListener<KeymapAdapterModel>, MenuItem.OnMenuItemClickListener {
@@ -107,6 +106,34 @@ class HomeActivity : AppCompatActivity(), SelectionCallback,
         val intentFilter = IntentFilter()
         intentFilter.addAction(Intent.ACTION_INPUT_METHOD_CHANGED)
         registerReceiver(mBroadcastReceiver, intentFilter)
+
+        //ask the user whether they want to enable analytics
+        val isFirstTime = defaultSharedPreferences.getBoolean(
+                str(R.string.key_pref_first_time), true
+        )
+
+        defaultSharedPreferences.edit {
+            if (isFirstTime) {
+                alert {
+                    titleResource = R.string.title_pref_data_collection
+                    messageResource = R.string.summary_pref_data_collection
+                    positiveButton(R.string.pos_opt_in) {
+                        putBoolean(str(R.string.key_pref_data_collection), true).commit()
+                        setFirebaseDataCollection()
+                        putBoolean(str(R.string.key_pref_first_time), false).commit()
+                    }
+
+                    negativeButton(R.string.neg_opt_out) {
+                        putBoolean(str(R.string.key_pref_data_collection), false).commit()
+                        setFirebaseDataCollection()
+                        putBoolean(str(R.string.key_pref_first_time), false).commit()
+                    }
+                }.show()
+
+            } else {
+                setFirebaseDataCollection()
+            }
+        }
     }
 
     override fun onMenuItemClick(item: MenuItem?): Boolean {
@@ -316,4 +343,12 @@ class HomeActivity : AppCompatActivity(), SelectionCallback,
     private fun setStatusBarColor(@ColorRes colorId: Int) {
         window.statusBarColor = color(colorId)
     }
+
+    private fun setFirebaseDataCollection() {
+        val isDataCollectionEnabled = defaultSharedPreferences.getBoolean(
+                str(R.string.key_pref_data_collection),
+                bool(R.bool.default_value_data_collection))
+
+        FirebaseAnalytics.getInstance(this@HomeActivity).setAnalyticsCollectionEnabled(isDataCollectionEnabled)
+    }
 }

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

@@ -6,4 +6,5 @@
     <bool name="default_value_show_volume_dialog_on_adjust">true</bool>
     <bool name="default_value_auto_change_ime_on_connection">false</bool>
     <bool name="default_value_allow_root_features">false</bool>
+    <bool name="default_value_data_collection">false</bool>
 </resources>

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

@@ -101,7 +101,9 @@
     <!-- Dialog buttons -->
     <string name="pos_yes">Yes</string>
     <string name="pos_done">Done</string>
+    <string name="pos_opt_in">Opt in</string>
 
+    <string name="neg_opt_out">Opt out</string>
     <string name="neg_no">No</string>
     <string name="neg_cancel">Cancel</string>
     <!-- Dialog buttons -->
@@ -116,10 +118,16 @@
 
     <!--preferences-->
     <!-- Look in the bools.xml file to find their default values -->
+    <string name="key_pref_first_time">pref_first_time</string>
+
     <string name="title_pref_show_notification">Show Notification</string>
     <string name="key_pref_show_notification">pref_show_notification</string>
     <string name="summary_pref_show_notification">Show a persistent notification to allow you to pick an input method. (The app requires ROOT permission for it to work on Android 8.1 and higher).</string>
 
+    <string name="title_pref_data_collection">Anonymous analytics</string>
+    <string name="key_pref_data_collection">pref_data_collection</string>
+    <string name="summary_pref_data_collection">Do you want to help improve Key Mapper by allowing it to anonymously collect data about how you use it such as crash reports? The data is collected by Google Firebase. The privacy policy is located in the About activity.</string>
+
     <string name="key_pref_bluetooth_devices">pref_bluetooth_devices</string>
     <string name="title_pref_bluetooth_devices">Choose Bluetooth Devices…</string>
 

app/src/main/res/xml-v27/preferences.xml

@@ -1,5 +1,11 @@
 <?xml version="1.0" encoding="utf-8"?><!--Android 8.1+ is much more strict so a lot of stuff only works on rooted devices. :( -->
 <androidx.preference.PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
+    <androidx.preference.SwitchPreference
+        android:defaultValue="@bool/default_value_data_collection"
+        android:key="@string/key_pref_data_collection"
+        android:summary="@string/summary_pref_data_collection"
+        android:title="@string/title_pref_data_collection" />
+
     <androidx.preference.SwitchPreference
         android:defaultValue="@bool/default_value_show_toast"
         android:key="@string/key_pref_show_toast_when_action_performed"

app/src/main/res/xml/preferences.xml

@@ -1,5 +1,11 @@
 <?xml version="1.0" encoding="utf-8"?>
 <androidx.preference.PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
+    <androidx.preference.SwitchPreference
+        android:defaultValue="@bool/default_value_data_collection"
+        android:key="@string/key_pref_data_collection"
+        android:summary="@string/summary_pref_data_collection"
+        android:title="@string/title_pref_data_collection" />
+
     <androidx.preference.SwitchPreference
         android:defaultValue="@bool/default_value_show_toast"
         android:key="@string/key_pref_show_toast_when_action_performed"