From 6b2dd5b290850301472a7097c84f76972b43b507 Mon Sep 17 00:00:00 2001
From: Javier <dev.git@javispedro.com>
Date: Fri, 26 Mar 2021 20:09:25 +0100
Subject: Add new Preferences activity and allow choosing temperature units

---
 app/src/main/AndroidManifest.xml                   |  6 ++--
 .../com/javispedro/rempe/DeviceViewHolder.java     | 23 +++++++++++++--
 .../java/com/javispedro/rempe/MainActivity.java    |  2 ++
 .../java/com/javispedro/rempe/Preferences.java     |  4 +++
 .../com/javispedro/rempe/SettingsActivity.java     | 33 ++++++++++++++++++++++
 app/src/main/res/layout/settings_activity.xml      |  9 ++++++
 app/src/main/res/values/arrays.xml                 | 13 +++++++++
 app/src/main/res/values/dimens.xml                 |  1 -
 app/src/main/res/values/strings.xml                |  6 ++++
 app/src/main/res/xml/root_preferences.xml          | 11 ++++++++
 10 files changed, 103 insertions(+), 5 deletions(-)
 create mode 100644 app/src/main/java/com/javispedro/rempe/SettingsActivity.java
 create mode 100644 app/src/main/res/layout/settings_activity.xml
 create mode 100644 app/src/main/res/values/arrays.xml
 create mode 100644 app/src/main/res/xml/root_preferences.xml

diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 18651ae..cc27544 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -4,18 +4,20 @@
 
     <application
         android:allowBackup="true"
+        android:label="@string/app_name"
         android:icon="@mipmap/ic_launcher"
         android:roundIcon="@mipmap/ic_launcher_round"
-        android:label="@string/app_name"
         android:supportsRtl="true"
         android:theme="@style/Theme.Rempe">
+        <activity
+            android:name=".SettingsActivity"
+            android:label="@string/settings_title"></activity>
         <activity
             android:name=".MainActivity"
             android:label="@string/app_name"
             android:theme="@style/Theme.Rempe.NoActionBar">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
-
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
diff --git a/app/src/main/java/com/javispedro/rempe/DeviceViewHolder.java b/app/src/main/java/com/javispedro/rempe/DeviceViewHolder.java
index 2e2a441..4d1c99a 100644
--- a/app/src/main/java/com/javispedro/rempe/DeviceViewHolder.java
+++ b/app/src/main/java/com/javispedro/rempe/DeviceViewHolder.java
@@ -1,11 +1,13 @@
 package com.javispedro.rempe;
 
 import android.content.Context;
+import android.content.SharedPreferences;
 import android.view.View;
 import android.widget.ImageView;
 import android.widget.ProgressBar;
 import android.widget.TextView;
 
+import androidx.preference.PreferenceManager;
 import androidx.recyclerview.widget.RecyclerView;
 
 import com.dsi.ant.plugins.antplus.pcc.defines.RequestAccessResult;
@@ -18,6 +20,8 @@ public class DeviceViewHolder extends RecyclerView.ViewHolder implements Device.
     private final View mView;
     private final Context mContext;
 
+    private final SharedPreferences mPrefs;
+
     private final TextView mTemperatureView;
     private final TextView mMinMaxTemperatureLabel;
     private final TextView mMinTemperatureView;
@@ -29,12 +33,17 @@ public class DeviceViewHolder extends RecyclerView.ViewHolder implements Device.
     private final TextView mSignalLabel;
     private final ProgressBar mSignalBar;
 
+    private final static BigDecimal C2F_MULT = new BigDecimal("1.8");
+    private final static BigDecimal C2F_ADD = new BigDecimal("32");
+    private final static BigDecimal C2K_ADD = new BigDecimal("273.15");
+
     private Device mDevice;
 
     public DeviceViewHolder(View view) {
         super(view);
         mView = view;
         mContext = view.getContext();
+        mPrefs = PreferenceManager.getDefaultSharedPreferences(mContext);
         mNameView = view.findViewById(R.id.nameView);
         mStatusView = view.findViewById(R.id.statusView);
         mStatusImageView = view.findViewById(R.id.statusImageView);
@@ -82,8 +91,18 @@ public class DeviceViewHolder extends RecyclerView.ViewHolder implements Device.
         mSignalBar.setProgress(0);
     }
 
-    private String formatTemperature(BigDecimal temp) {
-        return mContext.getString(R.string.temperature_celsius, temp);
+    private String formatTemperature(BigDecimal tempC) {
+        switch (Preferences.getUnits(mPrefs)) {
+            default:
+            case "celsius":
+                return mContext.getString(R.string.temperature_celsius, tempC);
+            case "fahrenheit":
+                BigDecimal tempF = (tempC.multiply(C2F_MULT)).add(C2F_ADD);
+                return mContext.getString(R.string.temperature_fahrenheit, tempF);
+            case "kelvin":
+                BigDecimal tempK = (tempC.add(C2K_ADD));
+                return mContext.getString(R.string.temperature_kelvin, tempK);
+        }
     }
 
     @Override
diff --git a/app/src/main/java/com/javispedro/rempe/MainActivity.java b/app/src/main/java/com/javispedro/rempe/MainActivity.java
index 48fa5fd..77caa96 100644
--- a/app/src/main/java/com/javispedro/rempe/MainActivity.java
+++ b/app/src/main/java/com/javispedro/rempe/MainActivity.java
@@ -1,5 +1,6 @@
 package com.javispedro.rempe;
 
+import android.content.Intent;
 import android.content.SharedPreferences;
 import android.os.Bundle;
 import android.util.Log;
@@ -104,6 +105,7 @@ public class MainActivity extends AppCompatActivity {
 
         switch (id) {
             case R.id.action_settings:
+                startActivity(new Intent(this, SettingsActivity.class));
                 return true;
         }
 
diff --git a/app/src/main/java/com/javispedro/rempe/Preferences.java b/app/src/main/java/com/javispedro/rempe/Preferences.java
index 41c943c..d82b004 100644
--- a/app/src/main/java/com/javispedro/rempe/Preferences.java
+++ b/app/src/main/java/com/javispedro/rempe/Preferences.java
@@ -40,4 +40,8 @@ class Preferences {
         editor.putString(PREFS_DEVICES, pref);
         editor.apply();
     }
+
+    public static String getUnits(SharedPreferences prefs) {
+        return prefs.getString("units", "celsius");
+    }
 }
diff --git a/app/src/main/java/com/javispedro/rempe/SettingsActivity.java b/app/src/main/java/com/javispedro/rempe/SettingsActivity.java
new file mode 100644
index 0000000..f660c70
--- /dev/null
+++ b/app/src/main/java/com/javispedro/rempe/SettingsActivity.java
@@ -0,0 +1,33 @@
+package com.javispedro.rempe;
+
+import android.os.Bundle;
+
+import androidx.appcompat.app.ActionBar;
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.preference.PreferenceFragmentCompat;
+
+public class SettingsActivity extends AppCompatActivity {
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.settings_activity);
+        if (savedInstanceState == null) {
+            getSupportFragmentManager()
+                    .beginTransaction()
+                    .replace(R.id.settings, new SettingsFragment())
+                    .commit();
+        }
+        ActionBar actionBar = getSupportActionBar();
+        if (actionBar != null) {
+            actionBar.setDisplayHomeAsUpEnabled(true);
+        }
+    }
+
+    public static class SettingsFragment extends PreferenceFragmentCompat {
+        @Override
+        public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
+            setPreferencesFromResource(R.xml.root_preferences, rootKey);
+        }
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/res/layout/settings_activity.xml b/app/src/main/res/layout/settings_activity.xml
new file mode 100644
index 0000000..de6591a
--- /dev/null
+++ b/app/src/main/res/layout/settings_activity.xml
@@ -0,0 +1,9 @@
+<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>
\ No newline at end of file
diff --git a/app/src/main/res/values/arrays.xml b/app/src/main/res/values/arrays.xml
new file mode 100644
index 0000000..f82d234
--- /dev/null
+++ b/app/src/main/res/values/arrays.xml
@@ -0,0 +1,13 @@
+<resources>
+    <string-array name="settings_unit_entries">
+        <item>Celsius</item>
+        <item>Fahrenheit</item>
+        <item>Kelvin</item>
+    </string-array>
+
+    <string-array name="settings_unit_values">
+        <item>celsius</item>
+        <item>fahrenheit</item>
+        <item>kelvin</item>
+    </string-array>
+</resources>
\ No newline at end of file
diff --git a/app/src/main/res/values/dimens.xml b/app/src/main/res/values/dimens.xml
index cf00d3f..125df87 100644
--- a/app/src/main/res/values/dimens.xml
+++ b/app/src/main/res/values/dimens.xml
@@ -1,4 +1,3 @@
 <resources>
     <dimen name="fab_margin">16dp</dimen>
-    <dimen name="text_margin">16dp</dimen>
 </resources>
\ No newline at end of file
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index c90f66a..df21b28 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -14,6 +14,8 @@
 
     <string name="temperature_nothing">—</string>
     <string name="temperature_celsius">%.1f °C</string>
+    <string name="temperature_fahrenheit">%.0f °F</string>
+    <string name="temperature_kelvin">%.1f °K</string>
 
     <string name="last_24h">Last 24h:</string>
 
@@ -40,4 +42,8 @@
     <string name="connection_result_unrecognized">Unrecognized device</string>
     <string name="connection_result_unknown">Unknown failure</string>
 
+    <!-- Settings -->
+    <string name="settings_title">Settings</string>
+    <string name="settings_unit">Units</string>
+
 </resources>
\ No newline at end of file
diff --git a/app/src/main/res/xml/root_preferences.xml b/app/src/main/res/xml/root_preferences.xml
new file mode 100644
index 0000000..c360335
--- /dev/null
+++ b/app/src/main/res/xml/root_preferences.xml
@@ -0,0 +1,11 @@
+<PreferenceScreen xmlns:app="http://schemas.android.com/apk/res-auto">
+
+    <ListPreference
+        app:key="units"
+        app:title="@string/settings_unit"
+        app:entries="@array/settings_unit_entries"
+        app:entryValues="@array/settings_unit_values"
+        app:defaultValue="celsius"
+        app:useSimpleSummaryProvider="true" />
+
+</PreferenceScreen>
\ No newline at end of file
-- 
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