CoordinatorLayout之Behavior使用

import android.animation.Animator;
import android.content.Context;
import android.support.design.widget.CoordinatorLayout;
import android.support.v4.view.ViewCompat;
import android.support.v4.view.animation.FastOutSlowInInterpolator;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewPropertyAnimator;
import android.view.animation.Interpolator;

/**
 * CoordinatorLayout Behavior for a quick return footer
 *
 * When a nested ScrollView is scrolled down, the quick return view will disappear.
 * When the ScrollView is scrolled back up, the quick return view will reappear.
 *
 * @author bherbst
 */
@SuppressWarnings("unused")
public class QuickReturnFooterBehavior extends CoordinatorLayout.Behavior<View> {
    private static final Interpolator INTERPOLATOR = new FastOutSlowInInterpolator();

    private int mDySinceDirectionChange;

    public QuickReturnFooterBehavior(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    public boolean onStartNestedScroll(CoordinatorLayout coordinatorLayout, View child, View directTargetChild, View target, int nestedScrollAxes) {
        return (nestedScrollAxes & ViewCompat.SCROLL_AXIS_VERTICAL) != 0;
    }

    @Override
    public void onNestedPreScroll(CoordinatorLayout coordinatorLayout, View child, View target, int dx, int dy, int[] consumed) {
        if (dy > 0 && mDySinceDirectionChange < 0
                || dy < 0 && mDySinceDirectionChange > 0) {
            // We detected a direction change- cancel existing animations and reset our cumulative delta Y
            child.animate().cancel();
            mDySinceDirectionChange = 0;
        }

        mDySinceDirectionChange += dy;

        if (mDySinceDirectionChange > child.getHeight() && child.getVisibility() == View.VISIBLE) {
            hide(child);
        } else if (mDySinceDirectionChange < 0 && child.getVisibility() == View.GONE) {
            show(child);
        }
    }

    /**
     * Hide the quick return view.
     *
     * Animates hiding the view, with the view sliding down and out of the screen.
     * After the view has disappeared, its visibility will change to GONE.
     *
     * @param view The quick return view
     */
    private void hide(final View view) {
        ViewPropertyAnimator animator = view.animate()
                .translationY(view.getHeight())
                .setInterpolator(INTERPOLATOR)
                .setDuration(200);

        animator.setListener(new Animator.AnimatorListener() {
            @Override
            public void onAnimationStart(Animator animator) {}

            @Override
            public void onAnimationEnd(Animator animator) {
                // Prevent drawing the View after it is gone
                view.setVisibility(View.GONE);
            }

            @Override
            public void onAnimationCancel(Animator animator) {
                // Canceling a hide should show the view
                show(view);
            }

            @Override
            public void onAnimationRepeat(Animator animator) {}
        });

        animator.start();
    }

    /**
     * Show the quick return view.
     *
     * Animates showing the view, with the view sliding up from the bottom of the screen.
     * After the view has reappeared, its visibility will change to VISIBLE.
     *
     * @param view The quick return view
     */
    private void show(final View view) {
        ViewPropertyAnimator animator = view.animate()
                .translationY(0)
                .setInterpolator(INTERPOLATOR)
                .setDuration(200);

        animator.setListener(new Animator.AnimatorListener() {
            @Override
            public void onAnimationStart(Animator animator) {
                view.setVisibility(View.VISIBLE);
            }

            @Override
            public void onAnimationEnd(Animator animator) {}

            @Override
            public void onAnimationCancel(Animator animator) {
                // Canceling a show should hide the view
                hide(view);
            }

            @Override
            public void onAnimationRepeat(Animator animator) {}
        });

        animator.start();
    }
}

<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" >

    <android.support.v7.widget.RecyclerView
        android:id="@+id/recyclerview"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom"
        app:layout_behavior="com.mb.widget.QuickReturnFooterBehavior"
        android:background="@color/quickreturn_background"
        android:gravity="center"
        android:padding="16dp"
        android:text="QuickReturn Footer"
        android:textAppearance="@style/TextAppearance.AppCompat.Headline"
        android:textColor="@android:color/white" />

</android.support.design.widget.CoordinatorLayout>

public class MainActivity extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recyclerview);
        recyclerView.setAdapter(new SimpleStringRecyclerViewAdapter(this,Arrays.asList(Cheeses.sCheeseStrings)));
        recyclerView.setLayoutManager(new LinearLayoutManager(this));
        
	}

}

SwipeDismissBehavior用法及实现原理
http://www.open-open.com/lib/view/open1446609550545.html

https://github.com/hugeterry/CoordinatorTabLayout