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import Foundation

protocol Shakeable {
    func shake()
    func yooo()
}

extension Shakeable {
    func shake() {
        print("Extension -> shake")

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Material Animations

[Android Transition Framework][transition-framework] can be used for three main things:

1. Animate activity layout content when transitioning from one activity to another.
2. Animate shared elements (Hero views) in transitions between activities.
3. Animate view changes within same activity.

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import android.os.SystemClock;
import android.support.v4.util.LruCache;

import java.util.HashMap;
import java.util.Map;

/**
 * An Lru Cache that allows entries to expire after
 * a period of time. Items are evicted based on a combination
 * of time, and usage. Adding items past the {@code maxSize}

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To remove a submodule you need to:

Delete the relevant line from the .gitmodules file.
Delete the relevant section from .git/config.
Run git rm --cached path_to_submodule (no trailing slash).
Commit and delete the now untracked submodule files.

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Android Tools Attributes

Android has a dedicated XML namespace intended for tools to be able to record information in XML files, and have that information stripped when the application is packaged such that there is no runtime or download size penalty. The namespace URI is http://schemas.android.com/tools and is usually bound to the tools: prefix:

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
 android:layout_width="match_parent"

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public class SomeFragment extends Fragment {
 
	MapView mapView;
	GoogleMap map;
 
	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
		View v = inflater.inflate(R.layout.some_layout, container, false);