Android Support Library 标题栏(Toolbar)滚动效果实现方法

<?xml version="1.0" encoding="utf-8"?><android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"  xmlns:app="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="cn.manchester.androidsupportlibrary.CoordinatorLayoutActivity">  <android.support.design.widget.AppBarLayout    android:id="@+id/appbar"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:fitsSystemWindows="true">    <include layout="@layout/toolbar" />  </android.support.design.widget.AppBarLayout>  <LinearLayout    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical"    android:scrollbars="none"    app:layout_behavior="@string/appbar_scrolling_view_behavior">    <android.support.v7.widget.RecyclerView      android:id="@+id/recyclerView"      android:layout_width="match_parent"      android:layout_height="match_parent" />  </LinearLayout></android.support.design.widget.CoordinatorLayout>

<?xml version="1.0" encoding="utf-8"?><android.support.v7.widget.Toolbar xmlns:android="http://schemas.android.com/apk/res/android"  xmlns:app="http://schemas.android.com/apk/res-auto"  android:id="@+id/toolbar"  android:layout_width="match_parent"  android:layout_height="wrap_content"  android:background="#304696"        android:popupTheme="@style/ThemeOverlay.AppCompat.Light"  app:layout_scrollFlags="scroll|enterAlways"  app:theme="@style/ThemeOverlay.AppCompat.ActionBar"></android.support.v7.widget.Toolbar>

public class CoordinatorLayoutActivity extends AppCompatActivity {  Toolbar mToolbar;  RecyclerView mRecyclerView;  String[] mArrays = new String[]{"1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12", "13", "14"};  @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_coordinator_layout);    mToolbar = (Toolbar) findViewById(R.id.toolbar);    setSupportActionBar(mToolbar);    getSupportActionBar().setDisplayHomeAsUpEnabled(true);    mRecyclerView = (RecyclerView) findViewById(R.id.recyclerView);    mRecyclerView.setLayoutManager(new LinearLayoutManager(this));    mRecyclerView.setAdapter(new MyAdapter());  }  class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> {    @Override    public MyAdapter.MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {      MyViewHolder holder = new MyViewHolder(LayoutInflater.from(CoordinatorLayoutActivity.this)          .inflate(android.R.layout.simple_list_item_1, parent, false));      return holder;    }    @Override    public void onBindViewHolder(MyAdapter.MyViewHolder holder, int position) {      holder.tv.setText(mArrays[position]);    }    @Override    public int getItemCount() {      return mArrays.length;    }    class MyViewHolder extends RecyclerView.ViewHolder {      TextView tv;      public MyViewHolder(View itemView) {        super(itemView);        tv = (TextView) itemView.findViewById(android.R.id.text1);      }    }  }}