Use grey toolbar on pre-Lollipop

app/src/main/java/org/isoron/uhabits/MainActivity.java

@@ -27,13 +27,16 @@ import android.content.Intent;
 import android.content.IntentFilter;
 import android.content.SharedPreferences;
 import android.content.pm.PackageManager;
+import android.graphics.drawable.ColorDrawable;
 import android.net.Uri;
 import android.os.AsyncTask;
+import android.os.Build;
 import android.os.Bundle;
 import android.os.Handler;
 import android.preference.PreferenceManager;
 import android.support.annotation.NonNull;
 import android.support.v4.content.LocalBroadcastManager;
+import android.support.v7.app.ActionBar;
 import android.view.Menu;
 import android.view.MenuItem;
 
@@ -84,9 +87,22 @@ public class MainActivity extends BaseActivity
         localBroadcastManager = LocalBroadcastManager.getInstance(this);
         localBroadcastManager.registerReceiver(receiver, new IntentFilter(ACTION_REFRESH));
 
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP)
+            onPreLollipopStartup();
+
         onStartup();
     }
 
+    private void onPreLollipopStartup()
+    {
+        ActionBar actionBar = getSupportActionBar();
+        if(actionBar == null) return;
+        if(UIHelper.isNightMode()) return;
+
+        int color = getResources().getColor(R.color.grey_900);
+        actionBar.setBackgroundDrawable(new ColorDrawable(color));
+    }
+
     private void onStartup()
     {
         PreferenceManager.setDefaultValues(this, R.xml.preferences, false);