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

首先来个效果图  

 布局文件代码

在布局文件中，CoordinatorLayout作为布局文件根节点，AppBarLayout包含在CoordinatorLayout中，toolbar在AppBarLayout节点下include进来。

<?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>

toolbar.xml

toolbar是需要响应view的滚动事件的，所以需要为toolbar指定layout_scrollFlags属性，scroll表示toobar会随着view的向下滚动而隐藏，enterAlways表示toolbar会随着view的向上滚动而恢复到原来的位置。

<?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>

Java代码

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);
}
}
}
}

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