[Android] Android利用Coordinatorlayout+AppbarLayout实现折叠式布局

折叠式布局在App中相当常见，给人一种科技感，充满良好的用户体验。

本文就以两个简单的例子，来举例说明基本折叠式布局：

首先需要在app/build.gradle下添加如下依赖：

compile 'com.android.support:support-v4:23.4.0'
compile 'com.android.support:design:23.4.0'

一、实现Toolbar + menu 菜单

布局文件activity_toolbar.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".activity.ToolbarActivity">

    <android.support.v7.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="53dp"
        android:background="#cccccc">

    </android.support.v7.widget.Toolbar>

</RelativeLayout>

Java代码文件：

package com.jack.mymdfull.activity;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Toast;

import com.jack.mymdfull.R;

public class ToolbarActivity extends AppCompatActivity implements Toolbar.OnMenuItemClickListener{
    private Toolbar toolbar;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_toolbar);

        initView();
    }

    private void initView(){
        toolbar = (Toolbar)findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        toolbar.setTitle("Title");
        toolbar.setOnMenuItemClickListener(this);
    }

    @Override
    public boolean onMenuItemClick(MenuItem item) {
        switch (item.getItemId()){
            case R.id.menu_1:
                Toast.makeText(getApplicationContext(),"菜单1",Toast.LENGTH_SHORT).show();
                break;
            case R.id.menu_2:
                Toast.makeText(getApplicationContext(),"菜单2",Toast.LENGTH_SHORT).show();
                break;
        }
        return true;
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        //引入options菜单
        getMenuInflater().inflate(R.menu.menu,menu);
        return true;
    }
}

R.menu.menu.xml 文件

<?xml version="1.0" encoding="utf-8" ?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">

    <item
        android:id="@+id/menu_1"
        android:icon="@mipmap/***"
        android:title="菜单1"
        app:showAsAction="collapseActionView" />

    <item
        android:id="@+id/menu_2"
        android:icon="@mipmap/**"
        android:title="菜单2"
        app:showAsAction="collapseActionView" />
</menu>

显示效果如下：

二、CoordinatorLayout + AppBarLayout +　CollapsingToolbarLayout　＋ NestedScrollView 实现单页面 滚动 + 顶部

实现方法：
布局文件 acvity_col1.xml

<?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"
    android:orientation="vertical"
    tools:context=".activity.Col1Activity">

    <android.support.design.widget.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <android.support.design.widget.CollapsingToolbarLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:layout_scrollFlags="scroll|exitUntilCollapsed">

            <ImageView
                android:layout_width="match_parent"
                android:layout_height="200dp"
                android:background="@mipmap/bg"
                app:layout_collapseMode="parallax" />

            <android.support.v7.widget.Toolbar
                android:id="@+id/col1_toolbar"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:background="#000"
                android:minHeight="50dp"
                app:layout_collapseMode="pin">

                <TextView
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:text="文本标题" />
            </android.support.v7.widget.Toolbar>

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

    <android.support.v4.widget.NestedScrollView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:layout_behavior="@string/appbar_scrolling_view_behavior">

        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:padding="10dp"
            android:text="@string/col1_text"
            android:textColor="#000"
            android:textSize="20sp" />
    </android.support.v4.widget.NestedScrollView>

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

java代码文件：

package com.jack.mymdfull.activity;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.Toolbar;

import com.jack.mymdfull.R;

public class Col1Activity extends AppCompatActivity {
    private Toolbar col1_toolbar;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_col1);

        initView();
    }

    protected void initView(){
        col1_toolbar = (Toolbar)findViewById(R.id.col1_toolbar);
        setSupportActionBar(col1_toolbar);

        col1_toolbar.setTitle("标题");
    }
}

显示效果如下：

本博客地址： wukong1688

本文原文地址：https://www.cnblogs.com/wukong1688/p/10686758.html

转载请著名出处！谢谢~~