Add FAB (buggy)

app/build.gradle

@@ -24,7 +24,7 @@ dependencies {
     androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
         exclude group: 'com.android.support', module: 'support-annotations'
     })
-    compile 'com.android.support:appcompat-v7:25.+'
-    compile 'com.android.support.constraint:constraint-layout:1.0.2'
+    compile 'com.android.support:appcompat-v7:25.3.1'
+    compile 'com.android.support:design:25.3.1'
     testCompile 'junit:junit:4.12'
 }

app/src/main/java/de/trac/spherical/MainActivity.java

@@ -3,12 +3,14 @@ package de.trac.spherical;
 import android.content.Intent;
 import android.graphics.BitmapFactory;
 import android.net.Uri;
+import android.support.design.widget.FloatingActionButton;
 import android.support.v7.app.AppCompatActivity;
 import android.os.Bundle;
 import android.util.Log;
 import android.view.GestureDetector;
 import android.view.MotionEvent;
 import android.view.View;
+import android.widget.LinearLayout;
 import android.widget.Toast;
 
 import java.io.FileNotFoundException;
@@ -30,21 +32,38 @@ public class MainActivity extends AppCompatActivity {
 
     private SphereSurfaceView surfaceView;
     private Renderer renderer;
+    private FloatingActionButton fab;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
 
         // Initialize renderer and setup surface view.
         surfaceView = new SphereSurfaceView(this);
         renderer = new Renderer(surfaceView);
-        setContentView(surfaceView);
+        ((LinearLayout) findViewById(R.id.container)).addView(surfaceView);
+
+        fab = (FloatingActionButton) findViewById(R.id.fab);
+        fab.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                SphereSurfaceView.USE_TOUCH = !SphereSurfaceView.USE_TOUCH;
+                fab.hide();
+            }
+        });
+        fab.hide();
+
 
         // Detect gestures like single taps.
         final GestureDetector mGesDetect = new GestureDetector(this, new GestureDetector.SimpleOnGestureListener() {
             @Override
             public boolean onSingleTapConfirmed(MotionEvent event) {
-                SphereSurfaceView.USE_TOUCH = !SphereSurfaceView.USE_TOUCH;
+                if (fab.isShown()) {
+                    fab.hide();
+                } else {
+                    fab.show();
+                }
                 return true;
             }
         });

app/src/main/res/drawable/ic_explore_white_48px.xml

@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+
+    <path
+        android:fillColor="#FFFFFF"
+        android:pathData="M12 10.9c-.61 0-1.1 .49 -1.1 1.1s.49 1.1 1.1 1.1c.61 0 1.1-.49
+1.1-1.1s-.49-1.1-1.1-1.1zM12 2C6.48 2 2 6.48 2 12s4.48 10 10 10 10-4.48
+10-10S17.52 2 12 2zm2.19 12.19L6 18l3.81-8.19L18 6l-3.81 8.19z" />
+    <path
+        android:pathData="M0 0h24v24H0z" />
+</vector>

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

@@ -1,19 +1,29 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     tools:context="de.trac.spherical.MainActivity">
 
-    <TextView
-        android:id="@+id/hello_world"
+    <LinearLayout
+        android:id="@+id/container"
+        android:orientation="vertical"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        tools:layout_editor_absoluteY="8dp"
+        tools:layout_editor_absoluteX="8dp">
+    </LinearLayout>
+
+    <android.support.design.widget.FloatingActionButton
+        android:id="@+id/fab"
+        android:src="@drawable/ic_explore_white_48px"
+        app:fabSize="auto"
+        android:layout_gravity="bottom|end"
+        android:layout_margin="16dp"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:text="Hello World!"/>
-    <android.opengl.GLSurfaceView
-        android:id="@+id/surface_view"
-        android:layout_width="match_parent"
-        android:layout_height="match_parent"/>
+        app:layout_anchor="@id/container"
+        app:layout_anchorGravity="bottom|right|end" />
 
-</android.support.constraint.ConstraintLayout>
+</android.support.design.widget.CoordinatorLayout>