Android开发之CoordinatorLayoutAppBarLayoutViewPagerTabLayout实现顶部伸缩效果

源码已上传到码云上https://git.oschina.net/osczaizai/AndroidDemo

前面学习了coordinatorLayout，

连接：http://cherylgood.cn/c/Android开发之CoordinatorLayout使用详解一.php

http://cherylgood.cn/c/Android开发之CoordinatorLayout使用详解二.php

现在我们来个小demo 其实代码都很简单，只要你看了前面的两个使用介绍，基本久OK了

1、主布局文件

<?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:id="@+id/activity_recycler_view"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="guanaj.com.coordinatorlayoutdemo.recyclerdemo.RecyclerViewActivity">

    <android.support.design.widget.AppBarLayout
        android:id="@+id/appbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">

        <LinearLayout
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="120dp"
            android:background="#cccccc"
            app:layout_scrollFlags="scroll|enterAlways">

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="top content"
                android:textColor="#000" />
        </LinearLayout>


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

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        app:layout_behavior="@string/appbar_scrolling_view_behavior">

        <android.support.design.widget.TabLayout
            android:id="@+id/tablayout"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:tabTextColor="#000000" />

        <android.support.v4.view.ViewPager
            android:id="@+id/viewpager"
            android:layout_width="match_parent"
            android:layout_height="match_parent">

        </android.support.v4.view.ViewPager>
    </LinearLayout>

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

重点看这两句：

app:layout_scrollFlags="scroll|enterAlways"

app:layout_behavior="@string/appbar_scrolling_view_behavior"
其实

layout_behavior 只要设置在有子view 是可以滚动的就可以了，

主activity代码：

package guanaj.com.coordinatorlayoutdemo.recyclerdemo;

import android.net.Uri;
import android.support.design.widget.TabLayout;


import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

import java.util.ArrayList;
import java.util.List;

import guanaj.com.coordinatorlayoutdemo.R;

public class RecyclerViewActivity extends AppCompatActivity {

    private TabLayout tabLayout;
    private ViewPager viewPager;
    private List<Fragment> fragmentList = new ArrayList<>();
    private MyFragmentAdapter adapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_recycler_view);
        initViews();
        initEvent();
        initData();
    }



    private void initViews() {
        tabLayout = (TabLayout) findViewById(R.id.tablayout);
        viewPager = (ViewPager) findViewById(R.id.viewpager);
        tabLayout.setupWithViewPager(viewPager);
        adapter = new MyFragmentAdapter(getSupportFragmentManager());
        viewPager.setAdapter(adapter);
    }

    private void initEvent() {

    }
    private void initData() {
        for (int i = 0;i<5;i++){
            Fragment fragment = new ContentFragment();
            fragmentList.add(fragment);
        }
        adapter.notifyDataSetChanged();
    }




    class MyFragmentAdapter extends FragmentPagerAdapter {


        public MyFragmentAdapter(FragmentManager fm) {
            super(fm);
        }

        @Override
        public CharSequence getPageTitle(int position) {
            return "标题："+position;
        }

        @Override
        public Fragment getItem(int position) {
            return fragmentList.get(position);
        }

        @Override
        public int getCount() {
            return fragmentList == null ? 0 : fragmentList.size();
        }
    }
}

http://cherylgood.cn/c/Android开发之CoordinatorLayoutAppBarLayoutViewPagerTabLayout实现.php