Alpha background on FAB clicked

问题:

I'm using the library https://github.com/futuresimple/android-floating-action-button to create the fab buttons that works pretty well. I tried several libraries but none use the effect used in most application with a fab (or Google apps like keep, inbox) that when the fab is clicked the background of entire application becames semi-transparent white or black, it depends. I can't find any way to do it. Is it possible have an example or something like that to do this kind of effect? You can see what i mean in this image:

The semi-black background

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <RelativeLayout
        android:id="@+id/content_frame"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >

        <include
            android:id="@+id/toolbar"
            layout="@layout/toolbar" />
    </RelativeLayout>

    <RelativeLayout
        android:id="@+id/semi_white_bg"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@color/white_semi_transparent"
        android:visibility="gone" >
    </RelativeLayout>

    <RelativeLayout
        android:id="@+id/listFrame"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_below="@+id/content_frame"
        android:visibility="gone" >

        <TextView
            android:id="@+id/status"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@color/cabinet_color"
            android:fontFamily="sans-serif"
            android:gravity="center_vertical"
            android:paddingBottom="8dp"
            android:paddingLeft="16dp"
            android:paddingRight="16dp"
            android:paddingTop="8dp"
            android:textColor="#fff"
            android:textSize="17sp"
            android:visibility="gone" />

        <android.support.v7.widget.RecyclerView
            android:id="@android:id/list"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_below="@+id/status"
            android:clipToPadding="false"
            android:scrollbars="vertical" />

        <LinearLayout
            android:id="@android:id/empty"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerInParent="true"
            android:orientation="vertical" >

            <ImageView
                android:id="@+id/emptyImage"
                android:layout_width="96dp"
                android:layout_height="96dp"
                android:layout_gravity="center_horizontal"
                android:layout_marginBottom="16dp"
                android:scaleType="fitXY"
                android:src="?empty_image" />

            <TextView
                android:id="@+id/emptyText"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="center_horizontal"
                android:layout_marginLeft="16dp"
                android:layout_marginRight="16dp"
                android:fontFamily="sans-serif-light"
                android:gravity="center"
                android:lineSpacingMultiplier="1.4"
                android:paddingBottom="16dp"
                android:text="@string/no_files"
                android:textColor="?empty_text"
                android:textSize="22sp" />
        </LinearLayout>
    </RelativeLayout>

    <ProgressBar
        android:id="@android:id/progress"
        style="?android:progressBarStyle"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:indeterminateOnly="true" />

</RelativeLayout>

this is my layout.xml but seems not working at all as i want.Seems that not overlap the entire view but just colors what it wants..

回答1:

Liked your question...

This library won't allow u to set add button click event, you may have to change library code for your own, use this idea: Use Relatie or framelayout and add that black background or image behind FAB.

Now in library class FloatingActionsMenu.class find and comment this code:

//mAddButton.setOnClickListener(new OnClickListener()
//{
//  @Override
//  public void onClick(View v)
//  {
//      toggle();
//  }
//});

Then add this method in that class,

public void setAddButtonClickListener(OnClickListener listener)
{
mAddButton.setOnClickListener(listener);
}

Define click listener in your activity like

OnClickListener listener = new OnClickListener()
{
    @Override
    public void onClick(View v)
    {
        if (floatingActionMenuButton.isExpanded())
        {//make the background visible
        }
        else
        {//make the background invisible
        }
        floatingActionMenuButton.toggle();
    }
};

and pass it to FAB

floatingActionMenuButton.setAddButtonClickListener(listener);

Build library and project, Hope this will help!

回答2:

I found out this to be the easiest solution in my opinion, and it works perfectly :

fam.setOnFloatingActionsMenuUpdateListener(new FloatingActionsMenu.OnFloatingActionsMenuUpdateListener() {
        @Override
        public void onMenuExpanded() {
            dimmedBackground.setVisibility(View.VISIBLE);
        }

        @Override
        public void onMenuCollapsed() {
            dimmedBackground.setVisibility(View.GONE);
        }
    });

回答3:

You need to wrap your activity in a FrameLayout. FrameLayout should have 2 childs

• Your activity content
• Another Framelayout containing FloatingActionsMenu

Here is the relevant code snippet.

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:fab="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="in.city.bytes.view.MainActivity">

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">
    <!-- other content in the activity -->
</LinearLayout>

<FrameLayout
    android:id="@+id/frame_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/white_overlay">
    <!--  floating action menu with buttons -->
</FrameLayout>

In your activity, change the alpha of frame_layout when FAB menu is clicked. I have also written a blog explaining it. http://www.rishabhsinghal.in/implement-floating-action-button-similar-to-inbox-by-gmail-or-evernote/

回答4:

floatingActionMenu.setOnMenuToggleListener(
  new FloatingActionMenu.OnMenuToggleListener() { 
     @Override 
     public void onMenuToggle(boolean opened) {
         if(opened){
           //show backgroud
         }else{
           //hide backgroud
         }
     }
  });