首页设计

1、activity_main.xml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"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <android.support.design.widget.AppBarLayout
        android:id="@+id/appBar"
        android:layout_width="match_parent"
        android:layout_height="250dp">

        <android.support.design.widget.CollapsingToolbarLayout
            android:id="@+id/collapsing_toolbar"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
            app:contentScrim="?attr/colorPrimary"
            app:layout_scrollFlags="scroll|exitUntilCollapsed">

            <ImageView
                android:id="@+id/main_image_view"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:scaleType="centerCrop"
                app:layout_collapseMode="parallax"/>

            <android.support.v7.widget.Toolbar
                android:id="@+id/main_toolbar"
                android:layout_width="match_parent"
                android:layout_height="?attr/actionBarSize"
                android:background="?attr/colorPrimary"
                app:layout_collapseMode="parallax">

            </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="match_parent"
        >

        <LinearLayout
            android:orientation="vertical"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

            <android.support.v7.widget.CardView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_margin="15dp"
                app:cardCornerRadius="4dp">

                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_margin="10dp"/>

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

        </LinearLayout>
    </android.support.v4.widget.NestedScrollView>



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

　　2、MainActivity类文件

package com.samon.administrator.uclass;

import android.support.design.widget.CollapsingToolbarLayout;
import android.support.v7.app.ActionBar;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.MenuItem;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toolbar;

import com.baidubce.auth.DefaultBceCredentials;
import com.baidubce.services.bos.BosClient;
import com.baidubce.services.bos.BosClientConfiguration;
import com.baidubce.services.bos.model.BosObjectSummary;
import com.baidubce.services.bos.model.ListObjectsResponse;
import com.bumptech.glide.Glide;
import com.samon.administrator.uclass.util.BosUtil;

public class MainActivity extends AppCompatActivity {

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()){
            case android.R.id.home:
                finish();
                return true;
        }
        return super.onOptionsItemSelected(item);
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
       android.support.v7.widget.Toolbar toolbar = (android.support.v7.widget.Toolbar) findViewById(R.id.main_toolbar);
//        CollapsingToolbarLayout collapsingToolbarLayout = (CollapsingToolbarLayout) findViewById(R.id.collapsing_toolbar);
//        ImageView imageView = (ImageView) findViewById(R.id.main_image_view);
//
        setSupportActionBar(toolbar);
//        ActionBar actionBar = getSupportActionBar();
//        if (actionBar != null){
//            actionBar.setDisplayHomeAsUpEnabled(true);
//        }
//        collapsingToolbarLayout.setTitle("优博课堂");
//        String url = "http://cn.bing.com/az/hprichbg/rb/Dongdaemun_ZH-CN10736487148_1920x1080.jpg";
//        Glide.with(this).load(url).into(imageView);


    }
}

 3、添加依赖库

    implementation 'com.android.support:recyclerview-v7:24.2.1'
    implementation 'com.android.support:cardview-v7:24.2.1'
    implementation 'com.android.support:design:24.2.1'
    implementation 'de.hdodenhof:circleimageview:2.1.0'