implement Butterknife

app/build.gradle

@@ -24,4 +24,5 @@ dependencies {
     testCompile 'junit:junit:4.12'
     compile 'com.android.support:appcompat-v7:23.1.1'
     compile 'joda-time:joda-time:2.9.1'
+    compile 'com.jakewharton:butterknife:7.0.1'
 }

app/src/main/java/calendar/simplemobiletools/com/MainActivity.java

@@ -13,26 +13,29 @@ import org.joda.time.DateTime;
 
 import java.text.DateFormatSymbols;
 
+import butterknife.Bind;
+import butterknife.BindColor;
+import butterknife.ButterKnife;
+import butterknife.OnClick;
+
 public class MainActivity extends AppCompatActivity {
+    @Bind(R.id.left_arrow) ImageView leftArrow;
+    @Bind(R.id.right_arrow) ImageView rightArrow;
+    @Bind(R.id.table_month) TextView monthTV;
+    @Bind(R.id.table_holder) TableLayout tableHolder;
+    @BindColor(R.color.darkGrey) int grey;
+
     private DateTime targetDate;
-    private int grey;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
+        ButterKnife.bind(this);
 
-        grey = getResources().getColor(R.color.darkGrey);
-
-        final ImageView leftArrow = (ImageView) findViewById(R.id.left_arrow);
         leftArrow.getDrawable().mutate().setColorFilter(grey, PorterDuff.Mode.SRC_ATOP);
-
-        final ImageView rightArrow = (ImageView) findViewById(R.id.right_arrow);
         rightArrow.getDrawable().mutate().setColorFilter(grey, PorterDuff.Mode.SRC_ATOP);
 
-        final TextView monthTV = (TextView) findViewById(R.id.table_month);
-
-        final TableLayout tableHolder = (TableLayout) findViewById(R.id.table_holder);
         final LayoutInflater inflater = getLayoutInflater();
 
         final DateTime now = new DateTime();
@@ -71,6 +74,16 @@ public class MainActivity extends AppCompatActivity {
         }
     }
 
+    @OnClick(R.id.left_arrow)
+    public void leftArrowClicked() {
+
+    }
+
+    @OnClick(R.id.right_arrow)
+    public void rightArrowClicked() {
+
+    }
+
     private String getMonthName() {
         final String[] months = new DateFormatSymbols().getMonths();
         return months[targetDate.getMonthOfYear() - 1];

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

@@ -13,7 +13,9 @@
         android:layout_height="match_parent"
         android:layout_alignBottom="@+id/table_month"
         android:layout_alignTop="@+id/table_month"
+        android:paddingBottom="@dimen/activity_margin"
         android:paddingRight="@dimen/activity_margin"
+        android:paddingTop="@dimen/activity_margin"
         android:src="@mipmap/arrow_left"/>
 
     <TextView
@@ -33,7 +35,9 @@
         android:layout_alignBottom="@+id/table_month"
         android:layout_alignParentRight="true"
         android:layout_alignTop="@+id/table_month"
+        android:paddingBottom="@dimen/activity_margin"
         android:paddingLeft="@dimen/activity_margin"
+        android:paddingTop="@dimen/activity_margin"
         android:src="@mipmap/arrow_right"/>
 
     <TableLayout