Add new Preferences activity and allow choosing temperature units

4 files changed, 60 insertions, 2 deletions

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);
+        }
+    }
+}
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