add icons

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

@@ -17,7 +17,7 @@ import butterknife.OnClick;
 
 public class MainActivity extends AppCompatActivity {
     @BindView(R.id.viewHolder) RelativeLayout viewHolder;
-    @BindView(R.id.toggle_camera) View toggleCameraBtn;
+    @BindView(R.id.toggle_camera) ImageView toggleCameraBtn;
     @BindView(R.id.toggle_flash) ImageView toggleFlashBtn;
 
     private Preview preview;
@@ -42,8 +42,10 @@ public class MainActivity extends AppCompatActivity {
     public void toggleCamera() {
         if (currCamera == Camera.CameraInfo.CAMERA_FACING_BACK) {
             currCamera = Camera.CameraInfo.CAMERA_FACING_FRONT;
+            toggleCameraBtn.setImageResource(R.mipmap.camera_rear);
         } else {
             currCamera = Camera.CameraInfo.CAMERA_FACING_BACK;
+            toggleCameraBtn.setImageResource(R.mipmap.camera_front);
         }
 
         disableFlash();

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

@@ -16,26 +16,26 @@
         android:layout_height="wrap_content"
         android:layout_alignParentBottom="true"
         android:layout_marginBottom="@dimen/preview_btn_margin"
-        android:gravity="center_horizontal">
+        android:gravity="center_horizontal|bottom">
 
         <ImageView
             android:id="@+id/toggle_camera"
-            android:layout_width="wrap_content"
-            android:layout_height="wrap_content"
+            android:layout_width="@dimen/side_icon_size"
+            android:layout_height="@dimen/side_icon_size"
             android:layout_weight="1"
-            android:src="@mipmap/ic_launcher"/>
+            android:src="@mipmap/camera_front"/>
 
         <ImageView
             android:id="@+id/shutter"
-            android:layout_width="wrap_content"
-            android:layout_height="wrap_content"
+            android:layout_width="@dimen/main_icon_size"
+            android:layout_height="@dimen/main_icon_size"
             android:layout_weight="1"
-            android:src="@mipmap/ic_launcher"/>
+            android:src="@mipmap/camera"/>
 
         <ImageView
             android:id="@+id/toggle_flash"
-            android:layout_width="wrap_content"
-            android:layout_height="wrap_content"
+            android:layout_width="@dimen/side_icon_size"
+            android:layout_height="@dimen/side_icon_size"
             android:layout_weight="1"
             android:src="@mipmap/flash_off"/>
 

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

@@ -1,4 +1,6 @@
 <resources>
     <dimen name="activity_margin">16dp</dimen>
     <dimen name="preview_btn_margin">32dp</dimen>
+    <dimen name="side_icon_size">36dp</dimen>
+    <dimen name="main_icon_size">48dp</dimen>
 </resources>