compile 'com.github.bijoysingh.floating-bubble:3.0.0'

// compile 'com.github.bijoysingh.floating-bubble:2.0.0' for Android Support v27
// compile 'com.github.bijoysingh.floating-bubble:1.2.0' for Android Support v26

public class FloatingService extends FloatingBubbleService {
    ...
}

<service android:name="<YOUR_PACKAGE>.FloatingService" />

startService(new Intent(context, FloatingService.class));

public class FloatingService extends FloatingBubbleService {

  @Override
  protected FloatingBubbleConfig getConfig() {
    return new FloatingBubbleConfig.Builder()
        // Set the drawable for the bubble
        .bubbleIcon(bubbleDrawable)

        // Set the drawable for the remove bubble
        .removeBubbleIcon(removeIconDrawable)

        // Set the size of the bubble in dp
        .bubbleIconDp(64)

        // Set the size of the remove bubble in dp
        .removeBubbleIconDp(64)

        // Set the padding of the view from the boundary
        .paddingDp(4)

        // Set the radius of the border of the expandable view
        .borderRadiusDp(4)

        // Does the bubble attract towards the walls
        .physicsEnabled(true)

        // The color of background of the layout
        .expandableColor(Color.WHITE)

        // The color of the triangular layout
        .triangleColor(Color.WHITE)

        // Horizontal gravity of the bubble when expanded
        .gravity(Gravity.END)

        // The view which is visible in the expanded view
        .expandableView(yourViewAfterClick)

        // Set the alpha value for the remove bubble icon
        .removeBubbleAlpha(0.75f)

        // Building
        .build();
  }
}

  @Override
  protected boolean onGetIntent(@NonNull Intent intent) {
    // your logic to get information from the intent
    return true;
  }

// To expand
setState(true);

// To compress
setState(false);

Copyright 2016 Bijoy Singh Kochar

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.