Fab customizing

app/src/main/java/me/cullycross/test4tabs/activities/FourTabsActivity.java

@@ -3,7 +3,6 @@
 import android.content.Intent;
 import android.os.Bundle;
 import android.support.design.widget.FloatingActionButton;
-import android.support.design.widget.Snackbar;
 import android.support.design.widget.TabLayout;
 import android.support.v4.app.Fragment;
 import android.support.v4.app.FragmentManager;
@@ -15,6 +14,7 @@
 import android.widget.Toast;
 import butterknife.Bind;
 import butterknife.ButterKnife;
+import butterknife.OnPageChange;
 import me.cullycross.test4tabs.R;
 import me.cullycross.test4tabs.fragments.ContactsFragment;
 import me.cullycross.test4tabs.fragments.DatabaseFragment;
@@ -25,11 +25,17 @@
 public class FourTabsActivity extends AppCompatActivity
     implements EmailDialogFragment.OnFragmentInteractionListener {
 
-  private SectionsPagerAdapter mSectionsPagerAdapter;
+  public static final int CONTACTS_POS = 0;
+  public static final int DATABASE_POS = 1;
+  public static final int PICTURES_POS = 2;
+  public static final int SINGLE_PICTURE_POS = 3;
 
   @Bind(R.id.toolbar) Toolbar mToolbar;
   @Bind(R.id.container) ViewPager mViewPager;
   @Bind(R.id.tabs) TabLayout mTabLayout;
+  @Bind(R.id.fab) FloatingActionButton mFab;
+
+  private SectionsPagerAdapter mSectionsPagerAdapter;
 
   @Override protected void onCreate(Bundle savedInstanceState) {
     super.onCreate(savedInstanceState);
@@ -43,14 +49,8 @@ public class FourTabsActivity extends AppCompatActivity
     mViewPager.setAdapter(mSectionsPagerAdapter);
     mTabLayout.setupWithViewPager(mViewPager);
 
-    FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
-    fab.setOnClickListener(new View.OnClickListener() {
-      @Override public void onClick(View view) {
-        Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
-            .setAction("Action", null)
-            .show();
-      }
-    });
+    mFab.setTag(false);
+    mFab.hide();
   }
 
   @Override public void onSendEmail(String recipient, String subject, String body) {
@@ -66,6 +66,27 @@ public class FourTabsActivity extends AppCompatActivity
     }
   }
 
+  @OnPageChange(R.id.container) public void onPageSelected(int position) {
+    switch (position) {
+      case DATABASE_POS:
+        mFab.setTag(true);
+        mFab.setVisibility(View.INVISIBLE);
+        mFab.setImageResource(R.drawable.ic_add);
+        mFab.show();
+        break;
+      case PICTURES_POS:
+        mFab.setTag(true);
+        mFab.setVisibility(View.INVISIBLE);
+        mFab.setImageResource(R.drawable.ic_update);
+        mFab.show();
+        break;
+      default:
+        mFab.setTag(false);
+        mFab.hide();
+        break;
+    }
+  }
+
   public class SectionsPagerAdapter extends FragmentPagerAdapter {
 
     public static final String CONTACTS = "Contacts";
@@ -80,13 +101,13 @@ public SectionsPagerAdapter(FragmentManager fm) {
     @Override public Fragment getItem(int position) {
 
       switch (position) {
-        case 0:
+        case CONTACTS_POS:
           return ContactsFragment.newInstance();
-        case 1:
+        case DATABASE_POS:
           return DatabaseFragment.newInstance();
-        case 2:
+        case PICTURES_POS:
           return PicturesFragment.newInstance();
-        case 3:
+        case SINGLE_PICTURE_POS:
           return SinglePictureFragment.newInstance();
         default:
           return null;

app/src/main/java/me/cullycross/test4tabs/utils/HidingFabBehavior.java

@@ -16,7 +16,7 @@
  *
  * See
  * <a href="https://guides.codepath.com/android/Floating-Action-Buttons#using-coordinatorlayout">
- *   this article</>
+ * this article</>
  */
 public class HidingFabBehavior extends FloatingActionButton.Behavior {
 
@@ -38,7 +38,8 @@ public void onNestedScroll(CoordinatorLayout coordinatorLayout, FloatingActionBu
 
     if (dyConsumed > 0 && child.getVisibility() == View.VISIBLE) {
       child.hide();
-    } else if (dyConsumed < 0 && child.getVisibility() != View.VISIBLE) {
+    } else if (dyConsumed < 0 && child.getVisibility() != View.VISIBLE
+        && ((Boolean) child.getTag())) {
       child.show();
     }
   }

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

@@ -46,7 +46,6 @@
       android:layout_height="wrap_content"
       android:layout_gravity="end|bottom"
       android:layout_margin="@dimen/fab_margin"
-      android:src="@android:drawable/ic_dialog_email"
       app:layout_behavior="me.cullycross.test4tabs.utils.HidingFabBehavior"
       />