Add settings activity

It allows switching between light and dark modes, specifying step
width, and step data import/export (closes #70).

app/src/main/AndroidManifest.xml

@@ -31,6 +31,11 @@
             </intent-filter>
         </activity>
 
+        <activity
+            android:name=".ui.SettingsActivity"
+            android:exported="false"
+            android:label="@string/title_activity_settings" />
+
         <service
             android:name=".service.MotionService"
             android:foregroundServiceType="health"

app/src/main/java/com/tiefensuche/motionmate/ui/MainActivity.kt

@@ -61,6 +61,8 @@ internal class MainActivity : AppCompatActivity() {
         WindowCompat.setDecorFitsSystemWindows(window, false)
         setContentView(R.layout.activity_main)
 
+        Util.stepWidth = PreferenceManager.getDefaultSharedPreferences(this).getInt("step_width", 70)
+
         mTextViewSteps = findViewById(R.id.textViewSteps)
         mTextViewMeters = findViewById(R.id.textViewMeters)
         val mRecyclerView = findViewById<RecyclerView>(R.id.recyclerView)
@@ -128,6 +130,10 @@ internal class MainActivity : AppCompatActivity() {
             }
         }
 
+        mTextViewSteps.setOnClickListener {
+            startActivity(Intent(this, SettingsActivity::class.java))
+        }
+
         // initial update of the diagram
         setDataForWeek(Util.calendar)
 

app/src/main/java/com/tiefensuche/motionmate/ui/SettingsActivity.kt

@@ -0,0 +1,126 @@
+/*
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+package com.tiefensuche.motionmate.ui
+
+import android.app.Activity
+import android.content.Intent
+import android.net.Uri
+import android.os.Bundle
+import android.widget.Toast
+import androidx.appcompat.app.AppCompatActivity
+import androidx.preference.ListPreference
+import androidx.preference.Preference
+import androidx.preference.PreferenceFragmentCompat
+import androidx.preference.SeekBarPreference
+import com.tiefensuche.motionmate.R
+import com.tiefensuche.motionmate.util.Database
+import com.tiefensuche.motionmate.util.Util
+import java.io.FileInputStream
+import java.io.FileOutputStream
+import java.lang.Exception
+
+class SettingsActivity : AppCompatActivity() {
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.settings_activity)
+        if (savedInstanceState == null) {
+            supportFragmentManager
+                .beginTransaction()
+                .replace(R.id.settings, SettingsFragment())
+                .commit()
+        }
+        supportActionBar?.setDisplayHomeAsUpEnabled(true)
+    }
+
+    class SettingsFragment : PreferenceFragmentCompat() {
+        override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
+            setPreferencesFromResource(R.xml.root_preferences, rootKey)
+            findPreference<SeekBarPreference>("step_width")?.setOnPreferenceChangeListener { _, newValue ->
+                Util.stepWidth = newValue as Int
+                true
+            }
+            findPreference<ListPreference>("theme")?.setOnPreferenceChangeListener { _, newValue ->
+                Util.applyTheme(newValue.toString())
+                true
+            }
+            findPreference<Preference>("import")?.setOnPreferenceClickListener {
+                val intent = Intent(Intent.ACTION_OPEN_DOCUMENT).apply {
+                    addCategory(Intent.CATEGORY_OPENABLE)
+                    type = "text/*"
+                }
+                startActivityForResult(intent, 1)
+                true
+            }
+            findPreference<Preference>("export")?.setOnPreferenceClickListener {
+                val intent = Intent(Intent.ACTION_CREATE_DOCUMENT).apply {
+                    addCategory(Intent.CATEGORY_OPENABLE)
+                    type = "text/*"
+                    putExtra(Intent.EXTRA_TITLE, "step_data.csv")
+                }
+                startActivityForResult(intent, 2)
+                true
+            }
+        }
+
+        override fun onActivityResult(
+            requestCode: Int, resultCode: Int, resultData: Intent?) {
+            super.onActivityResult(requestCode, resultCode, resultData)
+            if (resultCode != Activity.RESULT_OK)
+                return
+            resultData?.data?.also { uri ->
+                when (requestCode) {
+                    1 -> import(uri)
+                    2 -> export(uri)
+                }
+            }
+        }
+
+        private fun import(uri: Uri) {
+            val db = Database.getInstance(requireContext())
+            try {
+                requireContext().contentResolver.openFileDescriptor(uri, "r")?.use {
+                    FileInputStream(it.fileDescriptor).bufferedReader().use {
+                        var entries = 0
+                        var failed = 0
+                        for (line in it.readLines()) {
+                            entries += 1
+                            try {
+                                val split = line.split(",")
+                                db.addEntry(split[0].toLong(), split[1].toInt())
+                            } catch (ex: Exception) {
+                                println("Can not import entry, ${ex.message}")
+                                failed += 1
+                            }
+                        }
+                        Toast.makeText(context, "Imported ${entries - failed} entries ($failed failed).", Toast.LENGTH_LONG).show()
+                    }
+                }
+            } catch (ex: Exception) {
+                println("Can not open file, ${ex.message}")
+                Toast.makeText(context, "Can not open file", Toast.LENGTH_LONG).show()
+            }
+        }
+
+        private fun export(uri: Uri) {
+            val db = Database.getInstance(requireContext())
+            try {
+                requireContext().contentResolver.openFileDescriptor(uri, "w")?.use {
+                    FileOutputStream(it.fileDescriptor).bufferedWriter().use {
+                        var entries = 0
+                        for (entry in db.getEntries(db.firstEntry, db.lastEntry)) {
+                            it.write("${entry.timestamp},${entry.steps}\r\n")
+                            entries += 1
+                        }
+                        Toast.makeText(context, "Exported $entries entries.", Toast.LENGTH_LONG).show()
+                    }
+                }
+            } catch (ex: Exception) {
+                println("Can not open file, ${ex.message}")
+                Toast.makeText(context, "Can not open file", Toast.LENGTH_LONG).show()
+            }
+        }
+    }
+}

app/src/main/java/com/tiefensuche/motionmate/util/Util.kt

@@ -4,6 +4,7 @@
 
 package com.tiefensuche.motionmate.util
 
+import androidx.appcompat.app.AppCompatDelegate
 import java.util.*
 
 internal object Util {
@@ -24,14 +25,23 @@ internal object Util {
         }
 
 
+    var stepWidth = 70
+
     /**
      * Formula to convert steps to kilometers
      *
      * @param steps steps
      * @return kilometers
      */
     internal fun stepsToMeters(steps: Number): Double {
-        return steps.toInt() * 0.762 / 1000
+        return (steps.toInt() * stepWidth).toDouble() / 100000
     }
 
+    internal fun applyTheme(theme: String) {
+        when (theme) {
+            "system" -> AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM)
+            "light" -> AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_NO)
+            "dark" -> AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_YES)
+        }
+    }
 }

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

@@ -0,0 +1,13 @@
+<!--
+  ~ SPDX-License-Identifier: GPL-3.0-only
+  -->
+
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <FrameLayout
+        android:id="@+id/settings"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent" />
+</LinearLayout>

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

@@ -0,0 +1,17 @@
+<!--
+  ~ SPDX-License-Identifier: GPL-3.0-only
+  -->
+
+<resources>
+    <string-array name="theme_entries">
+        <item>System</item>
+        <item>Light</item>
+        <item>Dark</item>
+    </string-array>
+
+    <string-array name="theme_values">
+        <item>system</item>
+        <item>light</item>
+        <item>dark</item>
+    </string-array>
+</resources>

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

@@ -21,4 +21,10 @@
     <string name="new_activity">New Activity</string>
     <string name="new_activity_started">Started new activity</string>
     <string name="no_sensor">Sorry, needed sensor is not present on your device.</string>
+    <!-- Preference Titles -->
+    <string name="title_activity_settings">SettingsActivity</string>
+    <string name="step_width">Step width in cm</string>
+    <string name="data">Data</string>
+    <string name="appearance">Appearance</string>
+    <string name="theme">Theme</string>
 </resources>

app/src/main/res/xml/root_preferences.xml

@@ -0,0 +1,37 @@
+<!--
+  ~ SPDX-License-Identifier: GPL-3.0-only
+  -->
+
+<PreferenceScreen xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <PreferenceCategory app:title="@string/step_width">
+        <SeekBarPreference
+            app:min="50"
+            android:max="120"
+            app:defaultValue="70"
+            app:showSeekBarValue="true"
+            app:key="step_width" />
+    </PreferenceCategory>
+
+    <PreferenceCategory app:title="@string/appearance">
+        <ListPreference
+            app:defaultValue="system"
+            app:entries="@array/theme_entries"
+            app:entryValues="@array/theme_values"
+            app:key="theme"
+            app:title="@string/theme"
+            app:useSimpleSummaryProvider="true" />
+    </PreferenceCategory>
+
+    <PreferenceCategory app:title="@string/data">
+        <Preference
+            app:key="import"
+            app:title="Import" />
+
+        <Preference
+            app:key="export"
+            app:title="Export" />
+    </PreferenceCategory>
+
+</PreferenceScreen>