CollapsingTollbrLayout

Posted 2020-08-08 千古丶风流人物

main_activity.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.SwipeRefreshLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/swipe_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:addStatesFromChildren="true"
    app:layout_behavior="@string/appbar_scrolling_view_behavior">

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

        <android.support.design.widget.AppBarLayout
            android:id="@+id/appbar_layout"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:fitsSystemWindows="true">

            <android.support.design.widget.CollapsingToolbarLayout
                android:id="@+id/collapsing_toolbar_layout"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                app:contentScrim="#30469b"
                app:expandedTitleMarginStart="48dp"
                app:layout_scrollFlags="scroll|exitUntilCollapsed">

                <ImageView
                    android:layout_width="match_parent"
                    android:layout_height="256dp"
                    android:scaleType="centerCrop"
                    android:src="@mipmap/bg"
                    app:layout_collapseMode="parallax"
                    app:layout_collapseParallaxMultiplier="0" />


            </android.support.design.widget.CollapsingToolbarLayout>
        </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="50dp" />

            <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>
</android.support.v4.widget.SwipeRefreshLayout>

MainActivity.java

package com.example.myapplication;

import android.graphics.Color;
import android.os.Bundle;
import android.support.design.widget.AppBarLayout;
import android.support.design.widget.CollapsingToolbarLayout;
import android.support.design.widget.TabLayout;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentStatePagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.widget.DefaultItemAnimator;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.StaggeredGridLayoutManager;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Toast;

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


public class MainActivity extends ActionBarActivity {
    private RecyclerView mRecyclerView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initCollapsingToolbarLayout();
        initViewPager();
        initRefresh();
    }

    public void initViewPager() {
        final ArrayList<String> title = new ArrayList<>();
        title.add("TITLE1");
        title.add("TITLE2");
        TabLayout tabLayout = (TabLayout) findViewById(R.id.tablayout);
        ViewPager viewPager = (ViewPager) findViewById(R.id.viewpager);
        viewPager.setAdapter(new FragmentStatePagerAdapter(getSupportFragmentManager()) {
            @Override
            public Fragment getItem(int position) {
                return new ItemFragment();
            }
            @Override
            public int getCount() {
                return 2;
            }
            @Override
            public CharSequence getPageTitle(int position) {
                return title.get(position);
            }
        });

        tabLayout.setupWithViewPager(viewPager);
    }

    public void initCollapsingToolbarLayout() {
        //使用CollapsingToolbarLayout必须把title设置到CollapsingToolbarLayout上，设置到Toolbar上则不会显示
        CollapsingToolbarLayout mCollapsingToolbarLayout = (CollapsingToolbarLayout) findViewById(R.id.collapsing_toolbar_layout);
        mCollapsingToolbarLayout.setTitle("CollapsingToolbarLayout");
        //通过CollapsingToolbarLayout修改字体颜色
        mCollapsingToolbarLayout.setExpandedTitleColor(Color.WHITE);//设置还没收缩时状态下字体颜色
        mCollapsingToolbarLayout.setCollapsedTitleTextColor(Color.GREEN);//设置收缩后Toolbar上字体的颜色
    }

    public void initRefresh() {
        final SwipeRefreshLayout mSwipeRefreshLayout = (SwipeRefreshLayout) findViewById(R.id.swipe_layout);

        AppBarLayout appBarLayout = (AppBarLayout) findViewById(R.id.appbar_layout);
        appBarLayout.addOnOffsetChangedListener(new AppBarLayout.OnOffsetChangedListener() {
            @Override
            public void onOffsetChanged(AppBarLayout appBarLayout, int verticalOffset) {

                if (verticalOffset >= 0) {
                    mSwipeRefreshLayout.setEnabled(true);
                } else {
                    mSwipeRefreshLayout.setEnabled(false);
                }
            }
        });
    }


}

MyRecyclerViewAdapter.java

package com.example.myapplication;

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

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

/**
 * Created by 晓勇 on 2015/7/12 0012.
 */
public class MyRecyclerViewAdapter extends RecyclerView.Adapter<MyViewHolder> {
    private List<Integer> datas;
    private Context context;
    private List<Integer> lists;

    public MyRecyclerViewAdapter(Context context, List<Integer> datas) {
        this.datas = datas;
        this.context = context;
        getRandomHeights(datas);
    }

    private void getRandomHeights(List<Integer> datas) {
        lists = new ArrayList<>();
        for (int i = 0; i < datas.size(); i++) {
            lists.add((int) (200 + Math.random() * 400));
        }
    }

    @Override
    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(context).inflate(R.layout.layout_item, parent, false);
        MyViewHolder viewHolder = new MyViewHolder(view);
        return viewHolder;
    }

    @Override
    public void onBindViewHolder(MyViewHolder holder, int position) {
        ViewGroup.LayoutParams params = holder.itemView.getLayoutParams();
        params.height = lists.get(position);//把随机的高度赋予item布局
        holder.itemView.setLayoutParams(params);
        holder.mTextView.setText(position+"");
    }

    @Override
    public int getItemCount() {
        return datas.size();
    }
}

class MyViewHolder extends RecyclerView.ViewHolder {
    TextView mTextView;
    public MyViewHolder(View itemView) {
        super(itemView);
        mTextView = (TextView) itemView.findViewById(R.id.item_tv);
    }
}

ItemFragment.java

package com.example.myapplication;

import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v7.widget.DefaultItemAnimator;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.StaggeredGridLayoutManager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

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

/**
 * Created by gongsheng on 2016/9/5.
 */
public class ItemFragment extends Fragment {

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view=inflater.inflate(R.layout.fragment_itme,null);
        initDate(view);
        return view;
    }

    private void initDate(View v){
        RecyclerView mRecyclerView = (RecyclerView) v.findViewById(R.id.recyclerView);
        mRecyclerView.setLayoutManager(new StaggeredGridLayoutManager(2, StaggeredGridLayoutManager.VERTICAL));
        mRecyclerView.setItemAnimator(new DefaultItemAnimator());
        List<Integer> datas = new ArrayList<>();
        for (int i = 0; i < 100; i++) {
            datas.add(i);
        }
        mRecyclerView.setAdapter(new MyRecyclerViewAdapter(getActivity(), datas));
    }
}

fragment_itme.java

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">
    <android.support.v7.widget.RecyclerView
        android:id="@+id/recyclerView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:scrollbars="none" />
</LinearLayout>