Add a text filter to the top of preferences

app/src/main/java/info/nightscout/androidaps/activities/MyPreferenceFragment.kt

@@ -61,6 +61,7 @@ import javax.inject.Inject
 class MyPreferenceFragment : PreferenceFragmentCompat(), OnSharedPreferenceChangeListener, HasAndroidInjector {
 
     private var pluginId = -1
+    private var filter = ""
 
     @Inject lateinit var rxBus: RxBusWrapper
     @Inject lateinit var resourceHelper: ResourceHelper
@@ -115,11 +116,13 @@ class MyPreferenceFragment : PreferenceFragmentCompat(), OnSharedPreferenceChang
     override fun setArguments(args: Bundle?) {
         super.setArguments(args)
         pluginId = args?.getInt("id") ?: -1
+        filter = args?.getString("filter") ?: ""
     }
 
     override fun onSaveInstanceState(outState: Bundle) {
         super.onSaveInstanceState(outState)
         outState.putInt("id", pluginId)
+        outState.putString("filter", filter)
     }
 
     override fun onDestroy() {
@@ -148,7 +151,10 @@ class MyPreferenceFragment : PreferenceFragmentCompat(), OnSharedPreferenceChang
     override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
         (savedInstanceState ?: arguments)?.let { bundle ->
             if (bundle.containsKey("id")) {
-                pluginId = bundle.getInt("id")
+                pluginId = bundle.getInt("id") ?: -1
+            }
+            if (bundle.containsKey("filter")) {
+                filter = bundle.getString("filter") ?: ""
             }
         }
         if (pluginId != -1) {
@@ -191,6 +197,7 @@ class MyPreferenceFragment : PreferenceFragmentCompat(), OnSharedPreferenceChang
         }
         initSummary(preferenceScreen, pluginId != -1)
         preprocessPreferences()
+        if (filter != "") updateFilterVisibility(filter, preferenceScreen)
     }
 
     override fun onSharedPreferenceChanged(sharedPreferences: SharedPreferences, key: String) {
@@ -288,6 +295,33 @@ class MyPreferenceFragment : PreferenceFragmentCompat(), OnSharedPreferenceChang
         }
     }
 
+    private fun updateFilterVisibility(filter: String, p: Preference): Boolean {
+
+        var visible = false
+
+        if (p is PreferenceGroup) {
+            for (i in 0 until p.preferenceCount) {
+                visible = updateFilterVisibility(filter, p.getPreference(i)) || visible
+            }
+            if (visible && p is PreferenceCategory) {
+                p.initialExpandedChildrenCount = Int.MAX_VALUE
+            }
+        } else {
+            if (p.key != null) {
+                visible = visible || p.key.contains(filter, true)
+            }
+            if (p.title != null) {
+                visible = visible || p.title.contains(filter, true)
+            }
+            if (p.summary != null) {
+                visible = visible || p.summary.contains(filter, true)
+            }
+        }
+
+        p.isVisible = visible
+        return visible
+    }
+
     private fun updatePrefSummary(pref: Preference?) {
         if (pref is ListPreference) {
             pref.setSummary(pref.entry)
@@ -391,4 +425,9 @@ class MyPreferenceFragment : PreferenceFragmentCompat(), OnSharedPreferenceChang
         }
         return super.onPreferenceTreeClick(preference)
     }
+
+    public fun setFilter(filter: String) {
+        this.filter = filter
+        updateFilterVisibility(filter, preferenceScreen)
+    }
 }

app/src/main/java/info/nightscout/androidaps/activities/PreferencesActivity.kt

@@ -2,11 +2,15 @@ package info.nightscout.androidaps.activities
 
 import android.content.Context
 import android.os.Bundle
+import android.text.Editable
+import android.text.TextWatcher
 import androidx.preference.PreferenceFragmentCompat
 import androidx.preference.PreferenceScreen
 import info.nightscout.androidaps.R
 import info.nightscout.androidaps.utils.locale.LocaleHelper
 import info.nightscout.androidaps.utils.resources.ResourceHelper
+import kotlinx.android.synthetic.main.activity_preferences.*
+import kotlinx.android.synthetic.main.local_insight_status_item.view.*
 import javax.inject.Inject
 
 class PreferencesActivity : NoSplashAppCompatActivity(), PreferenceFragmentCompat.OnPreferenceStartScreenCallback {
@@ -14,18 +18,31 @@ class PreferencesActivity : NoSplashAppCompatActivity(), PreferenceFragmentCompa
     @Inject lateinit var resourceHelper: ResourceHelper
 
     var preferenceId = 0
+    var myPreferenceFragment: MyPreferenceFragment? = null
+
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
-        setContentView(R.layout.activity_single_fragment)
+        setContentView(R.layout.activity_preferences)
+
+        pref_filter.addTextChangedListener(object : TextWatcher {
+            override fun beforeTextChanged(s: CharSequence, start: Int, count: Int, after: Int) {}
+            override fun onTextChanged(s: CharSequence, start: Int, before: Int, count: Int) {
+                filterPreferences()
+            }
+
+            override fun afterTextChanged(s: Editable) {}
+        })
+
         title = resourceHelper.gs(R.string.nav_preferences)
         supportActionBar?.setDisplayHomeAsUpEnabled(true)
         supportActionBar?.setDisplayShowHomeEnabled(true)
-        val myPreferenceFragment = MyPreferenceFragment()
+        myPreferenceFragment = MyPreferenceFragment()
         preferenceId = intent.getIntExtra("id", -1)
         val args = Bundle()
         args.putInt("id", preferenceId)
-        myPreferenceFragment.arguments = args
+        args.putString("filter", pref_filter.text.toString())
-        supportFragmentManager.beginTransaction().replace(R.id.frame_layout, myPreferenceFragment).commit()
+        myPreferenceFragment?.arguments = args
+        supportFragmentManager.beginTransaction().replace(R.id.frame_layout, myPreferenceFragment!!).commit()
     }
 
     override fun onPreferenceStartScreen(caller: PreferenceFragmentCompat, pref: PreferenceScreen): Boolean {
@@ -44,4 +61,8 @@ class PreferencesActivity : NoSplashAppCompatActivity(), PreferenceFragmentCompa
     override fun attachBaseContext(newBase: Context) {
         super.attachBaseContext(LocaleHelper.wrap(newBase))
     }
+
+    private fun filterPreferences() {
+        myPreferenceFragment?.setFilter(pref_filter.text.toString())
+    }
 }

app/src/main/res/layout/activity_preferences.xml

@@ -0,0 +1,43 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical">
+
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:orientation="horizontal">
+
+        <TextView
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginStart="10dp"
+            android:text="@string/filter"
+            android:textAppearance="@android:style/TextAppearance.Material.Medium"
+            android:textStyle="bold" />
+
+        <EditText
+            android:id="@+id/pref_filter"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_weight="1" />
+
+    </LinearLayout>
+
+    <ScrollView
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:fillViewport="true">
+
+        <FrameLayout
+            android:id="@+id/frame_layout"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"></FrameLayout>
+
+    </ScrollView>
+
+</LinearLayout>

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

@@ -1466,4 +1466,6 @@
     <string name="uploaded_data">Uploaded Data</string>
     <string name="the_following_data_will_be_uploaded_to_your_open_humans_account">The following data will be uploaded to your Open Humans account: Glucose values, boluses, carbs, careportal events (except notes), extended boluses, profile switches, total daily doses, temporary basals, temp targets, preferences, application version, device model and screen dimensions. Secret or private information such as your Nightscout URL or API secret will not be uploaded.</string>
     <string name="setupwizard_pump_riley_link_status">RileyLink status:</string>
+    <string name="filter">Filter</string>
+
 </resources>