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 {@Overrideprotected 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