Android 滚动隐藏标题栏 和FAB按钮实现

其他 2019-03-13 09:58:21 阅读次数: 0

主页面：

package com.loaderman.samplecollect.hideonscroll;

import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.widget.Button;

import com.loaderman.samplecollect.R;

public class MainHideScrollyActivity extends AppCompatActivity implements View.OnClickListener {

    private Button partOneButton;
    private Button partTwoButton;
    private Button partThreeButton;

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

        initToolbar();

        partOneButton = (Button) findViewById(R.id.partOneButton);
        partTwoButton = (Button) findViewById(R.id.partTwoButton);
        partThreeButton = (Button) findViewById(R.id.partThreeButton);

        partOneButton.setOnClickListener(this);
        partTwoButton.setOnClickListener(this);
        partThreeButton.setOnClickListener(this);
    }

    private void initToolbar() {
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        setTitle(getString(R.string.app_name));
    }

    @Override
    public void onClick(View v) {
        if(v.equals(partOneButton)) {
            startActivity(PartOneActivity.class);
        } else if(v.equals(partTwoButton)) {
            startActivity(PartTwoActivity.class);
        } else if(v.equals(partThreeButton)){
            startActivity(PartThreeActivity.class);
        }
    }

    private void startActivity(Class<?> activityClass) {
        Intent myIntent = new Intent(this, activityClass);
        startActivity(myIntent);
    }
}

RecyclerView滑动监听

package com.loaderman.samplecollect.hideonscroll;

import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;

/*
* This class is a ScrollListener for RecyclerView that allows to show/hide
* views when list is scrolled. It assumes that you have added a header
* to your list. @see pl.michalz.hideonscrollexample.RecyclerAdapter
* */
public abstract class HidingScrollListener extends RecyclerView.OnScrollListener {

    private static final int HIDE_THRESHOLD = 20;

    private int mScrolledDistance = 0;
    private boolean mControlsVisible = true;


    @Override
    public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
        super.onScrolled(recyclerView, dx, dy);

        int firstVisibleItem = ((LinearLayoutManager) recyclerView.getLayoutManager()).findFirstVisibleItemPosition();

        if (firstVisibleItem == 0) {
            if(!mControlsVisible) {
                onShow();
                mControlsVisible = true;
            }
        } else {
            if (mScrolledDistance > HIDE_THRESHOLD && mControlsVisible) {
                onHide();
                mControlsVisible = false;
                mScrolledDistance = 0;
            } else if (mScrolledDistance < -HIDE_THRESHOLD && !mControlsVisible) {
                onShow();
                mControlsVisible = true;
                mScrolledDistance = 0;
            }
        }
        if((mControlsVisible && dy>0) || (!mControlsVisible && dy<0)) {
            mScrolledDistance += dy;
        }
    }

    public abstract void onHide();
    public abstract void onShow();
}

工具类

package com.loaderman.samplecollect.hideonscroll;


import android.content.Context;
import android.content.res.TypedArray;

import com.loaderman.samplecollect.R;

public class Utils {

    public static int getToolbarHeight(Context context) {
        final TypedArray styledAttributes = context.getTheme().obtainStyledAttributes(
                new int[]{R.attr.actionBarSize});
        int toolbarHeight = (int) styledAttributes.getDimension(0, 0);
        styledAttributes.recycle();

        return toolbarHeight;
    }

    public static int getTabsHeight(Context context) {
        return (int) context.getResources().getDimension(R.dimen.tabsHeight);
    }
}

FAB按钮滑动行为

package com.loaderman.samplecollect.hideonscroll;

import android.content.Context;
import android.support.design.widget.AppBarLayout;
import android.support.design.widget.CoordinatorLayout;
import android.support.design.widget.FloatingActionButton;
import android.util.AttributeSet;
import android.view.View;

public class ScrollingFABBehavior extends FloatingActionButton.Behavior {
    private int toolbarHeight;

    public ScrollingFABBehavior(Context context, AttributeSet attrs) {
        super();
        this.toolbarHeight = Utils.getToolbarHeight(context);
    }

    @Override
    public boolean layoutDependsOn(CoordinatorLayout parent, FloatingActionButton fab, View dependency) {
        return super.layoutDependsOn(parent, fab, dependency) || (dependency instanceof AppBarLayout);
    }

    @Override
    public boolean onDependentViewChanged(CoordinatorLayout parent, FloatingActionButton fab, View dependency) {
        boolean returnValue = super.onDependentViewChanged(parent, fab, dependency);
        if (dependency instanceof AppBarLayout) {
                CoordinatorLayout.LayoutParams lp = (CoordinatorLayout.LayoutParams) fab.getLayoutParams();
                int fabBottomMargin = lp.bottomMargin;
                int distanceToScroll = fab.getHeight() + fabBottomMargin;
                float ratio = (float)dependency.getY()/(float)toolbarHeight;
                fab.setTranslationY(-distanceToScroll * ratio);
        }
        return returnValue;
    }
}

RecyclerAdapter

package com.loaderman.samplecollect.hideonscroll;


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

import com.loaderman.samplecollect.R;

import java.util.List;

/*
* RecyclerView Adapter that allows to add a header view.
* */
public class RecyclerAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {

    private static final int TYPE_HEADER = 2;
    private static final int TYPE_ITEM = 1;
    private List<String> mItemList;

    public RecyclerAdapter(List<String> itemList) {
        mItemList = itemList;
    }

    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        Context context = parent.getContext();
        if (viewType == TYPE_ITEM) {
            final View view = LayoutInflater.from(context).inflate(R.layout.recycler_item, parent, false);
            return RecyclerItemViewHolder.newInstance(view);
        } else if (viewType == TYPE_HEADER) {
            final View view = LayoutInflater.from(context).inflate(R.layout.recycler_header, parent, false);
            return new RecyclerHeaderViewHolder(view);
        }
        throw new RuntimeException("There is no type that matches the type " + viewType + " + make sure your using types correctly");
    }

    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder viewHolder, int position) {
        if (!isPositionHeader(position)) {
            RecyclerItemViewHolder holder = (RecyclerItemViewHolder) viewHolder;
            String itemText = mItemList.get(position - 1); // header
            holder.setItemText(itemText);
        }
    }

    public int getBasicItemCount() {
        return mItemList == null ? 0 : mItemList.size();
    }


    @Override
    public int getItemViewType(int position) {
        if (isPositionHeader(position)) {
            return TYPE_HEADER;
        }

        return TYPE_ITEM;
    }

    @Override
    public int getItemCount() {
        return getBasicItemCount() + 1; // header
    }

    private boolean isPositionHeader(int position) {
        return position == 0;
    }

}
package com.loaderman.samplecollect.hideonscroll;

import android.support.v7.widget.RecyclerView;
import android.view.View;

public class RecyclerHeaderViewHolder extends RecyclerView.ViewHolder {
    public RecyclerHeaderViewHolder(View itemView) {
        super(itemView);
    }
}
package com.loaderman.samplecollect.hideonscroll;


import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.widget.TextView;

import com.loaderman.samplecollect.R;

public class RecyclerItemViewHolder extends RecyclerView.ViewHolder {

    private final TextView mItemTextView;

    public RecyclerItemViewHolder(final View parent, TextView itemTextView) {
        super(parent);
        mItemTextView = itemTextView;
    }

    public static RecyclerItemViewHolder newInstance(View parent) {
        TextView itemTextView = (TextView) parent.findViewById(R.id.itemTextView);
        return new RecyclerItemViewHolder(parent, itemTextView);
    }

    public void setItemText(CharSequence text) {
        mItemTextView.setText(text);
    }

}

页面一

package com.loaderman.samplecollect.hideonscroll;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;
import android.view.animation.AccelerateInterpolator;
import android.view.animation.DecelerateInterpolator;
import android.widget.FrameLayout;
import android.widget.ImageButton;

import com.loaderman.samplecollect.R;

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



public class PartOneActivity extends AppCompatActivity {

    private Toolbar mToolbar;
    private ImageButton mFabButton;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        setTheme(R.style.AppThemeRed);
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_part_one);

        initToolbar();
        mFabButton = (ImageButton) findViewById(R.id.fabButton);
        initRecyclerView();
    }

    private void initToolbar() {
        mToolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(mToolbar);
        setTitle(getString(R.string.app_name));
        mToolbar.setTitleTextColor(getResources().getColor(android.R.color.white));
    }

    private void initRecyclerView() {
        RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recyclerView);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));
        RecyclerAdapter recyclerAdapter = new RecyclerAdapter(createItemList());
        recyclerView.setAdapter(recyclerAdapter);

        recyclerView.addOnScrollListener(new HidingScrollListener() {
            @Override
            public void onHide() {
                hideViews();
            }

            @Override
            public void onShow() {
                showViews();
            }
        });
    }

    private void hideViews() {
        mToolbar.animate().translationY(-mToolbar.getHeight()).setInterpolator(new AccelerateInterpolator(2));

        FrameLayout.LayoutParams lp = (FrameLayout.LayoutParams) mFabButton.getLayoutParams();
        int fabBottomMargin = lp.bottomMargin;
        mFabButton.animate().translationY(mFabButton.getHeight()+fabBottomMargin).setInterpolator(new AccelerateInterpolator(2)).start();
    }

    private void showViews() {
        mToolbar.animate().translationY(0).setInterpolator(new DecelerateInterpolator(2));
        mFabButton.animate().translationY(0).setInterpolator(new DecelerateInterpolator(2)).start();
    }

    private List<String> createItemList() {
        List<String> itemList = new ArrayList<>();
        for(int i=0;i<20;i++) {
            itemList.add("Item "+i);
        }
        return itemList;
    }
}

页面二

package com.loaderman.samplecollect.hideonscroll;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.view.animation.AccelerateInterpolator;
import android.view.animation.DecelerateInterpolator;
import android.widget.FrameLayout;
import android.widget.ImageButton;
import android.widget.RelativeLayout;
import android.widget.Toast;

import com.loaderman.samplecollect.R;

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

public class PartTwoActivity extends AppCompatActivity {

    private RelativeLayout mToolbar;
    private ImageButton mFabButton;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setTheme(R.style.AppThemeGreen);
        setContentView(R.layout.activity_part_two);
        mToolbar = findViewById(R.id.rl_title_bar);
        mFabButton = (ImageButton) findViewById(R.id.fabButton);
        initRecyclerView();
    }
    private void initRecyclerView() {
        RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recyclerView);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));
        RecyclerAdapter recyclerAdapter = new RecyclerAdapter(createItemList());
        recyclerView.setAdapter(recyclerAdapter);

        recyclerView.addOnScrollListener(new HidingScrollListener() {
            @Override
            public void onHide() {
                hideViews();
            }

            @Override
            public void onShow() {
                showViews();
            }
        });
        mFabButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(PartTwoActivity.this,"点击了", Toast.LENGTH_SHORT).show();
            }
        });
    }



    private void hideViews() {
        mToolbar.animate().translationY(-mToolbar.getHeight()).setInterpolator(new AccelerateInterpolator(2));

        FrameLayout.LayoutParams lp = (FrameLayout.LayoutParams) mFabButton.getLayoutParams();
        int fabBottomMargin = lp.bottomMargin;
        mFabButton.animate().translationY(mFabButton.getHeight()+fabBottomMargin).setInterpolator(new AccelerateInterpolator(2)).start();
    }

    private void showViews() {
        mToolbar.animate().translationY(0).setInterpolator(new DecelerateInterpolator(2));
        mFabButton.animate().translationY(0).setInterpolator(new DecelerateInterpolator(2)).start();
    }

    private List<String> createItemList() {
        List<String> itemList = new ArrayList<>();
        for(int i=0;i<20;i++) {
            itemList.add("Item "+i);
        }
        return itemList;
    }
}

页面三

package com.loaderman.samplecollect.hideonscroll;

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

import com.loaderman.samplecollect.R;

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



public class PartThreeActivity extends AppCompatActivity {


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        setTheme(R.style.AppThemeBlue);
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_part_three);

        initToolbar();
        initViewPagerAndTabs();
    }

    private void initToolbar() {
        Toolbar mToolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(mToolbar);
        setTitle(getString(R.string.app_name));
        mToolbar.setTitleTextColor(getResources().getColor(android.R.color.white));
    }

    private void initViewPagerAndTabs() {
        ViewPager viewPager = (ViewPager) findViewById(R.id.viewPager);
        PagerAdapter pagerAdapter = new PagerAdapter(getSupportFragmentManager());
        pagerAdapter.addFragment(PartThreeFragment.createInstance(20), getString(R.string.tab_1));
        pagerAdapter.addFragment(PartThreeFragment.createInstance(4), getString(R.string.tab_2));
        viewPager.setAdapter(pagerAdapter);
        TabLayout tabLayout = (TabLayout) findViewById(R.id.tabLayout);
        tabLayout.setupWithViewPager(viewPager);
    }

    static class PagerAdapter extends FragmentPagerAdapter {

        private final List<Fragment> fragmentList = new ArrayList<>();
        private final List<String> fragmentTitleList = new ArrayList<>();

        public PagerAdapter(FragmentManager fragmentManager) {
            super(fragmentManager);
        }

        public void addFragment(Fragment fragment, String title) {
            fragmentList.add(fragment);
            fragmentTitleList.add(title);
        }

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

        @Override
        public int getCount() {
            return fragmentList.size();
        }
        @Override
        public CharSequence getPageTitle(int position) {
            return fragmentTitleList.get(position);
        }
    }
}
package com.loaderman.samplecollect.hideonscroll;



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

import com.loaderman.samplecollect.R;

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

public class PartThreeFragment extends Fragment {

    public final static String ITEMS_COUNT_KEY = "PartThreeFragment$ItemsCount";

    public static PartThreeFragment createInstance(int itemsCount) {
        PartThreeFragment partThreeFragment = new PartThreeFragment();
        Bundle bundle = new Bundle();
        bundle.putInt(ITEMS_COUNT_KEY, itemsCount);
        partThreeFragment.setArguments(bundle);
        return partThreeFragment;
    }

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        RecyclerView recyclerView = (RecyclerView) inflater.inflate(
                R.layout.fragment_part_three, container, false);
        setupRecyclerView(recyclerView);
        return recyclerView;
    }

    private void setupRecyclerView(RecyclerView recyclerView) {
        recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
        RecyclerAdapter recyclerAdapter = new RecyclerAdapter(createItemList());
        recyclerView.setAdapter(recyclerAdapter);
    }

    private List<String> createItemList() {
        List<String> itemList = new ArrayList<>();
        Bundle bundle = getArguments();
        if(bundle!=null) {
            int itemsCount = bundle.getInt(ITEMS_COUNT_KEY);
            for (int i = 0; i < itemsCount; i++) {
                itemList.add("Item " + i);
            }
        }
        return itemList;
    }
}

主页面布局activty_main_hide.xml

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

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:layout_gravity="center">
        <Button
            android:id="@+id/partOneButton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:text="@string/part_one"/>

        <Button
            android:id="@+id/partTwoButton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:text="@string/part_two"/>

        <Button
            android:id="@+id/partThreeButton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:text="@string/part_three"/>

    </LinearLayout>

    <android.support.v7.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        android:background="?attr/colorPrimary"/>
</FrameLayout>

activity_part_one.xml

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
                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.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/colorPrimary"/>

    <ImageButton
            android:id="@+id/fabButton"
            android:layout_width="56dp"
            android:layout_height="56dp"
            android:layout_gravity="bottom|right"
            android:layout_marginBottom="16dp"
            android:layout_marginRight="16dp"
            android:background="@drawable/fab_bcg"
            android:src="@drawable/ic_favorite_outline_white_24dp"
            android:contentDescription="@string/fab_description"/>


</FrameLayout>

activity_part_two.xml

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
                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.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/colorPrimary"/>

    <ImageButton
            android:id="@+id/fabButton"
            android:layout_width="56dp"
            android:layout_height="56dp"
            android:layout_gravity="bottom|right"
            android:layout_marginBottom="16dp"
            android:layout_marginRight="16dp"
            android:background="@drawable/fab_bcg"
            android:src="@drawable/ic_favorite_outline_white_24dp"
            android:contentDescription="@string/fab_description"/>


</FrameLayout>

activity_part_three.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"
                                                 android:id="@+id/coordinatorLayout"
                                                 android:layout_width="match_parent"
                                                 android:layout_height="match_parent">
    <android.support.design.widget.AppBarLayout
            android:id="@+id/appBarLayout"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">
        <android.support.v7.widget.Toolbar
                android:id="@+id/toolbar"
                android:layout_width="match_parent"
                android:layout_height="?attr/actionBarSize"
                android:background="?attr/colorPrimary"
                app:layout_scrollFlags="scroll|enterAlways" />
        <android.support.design.widget.TabLayout
                android:id="@+id/tabLayout"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                app:tabTextColor="@android:color/white"
                app:tabSelectedTextColor="@android:color/white"
                app:tabIndicatorColor="@android:color/white"
                app:tabIndicatorHeight="3dp"/>
    </android.support.design.widget.AppBarLayout>
    <android.support.v4.view.ViewPager
            android:id="@+id/viewPager"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            app:layout_behavior="@string/appbar_scrolling_view_behavior"/>
    <android.support.design.widget.FloatingActionButton
            android:id="@+id/fabButton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="end|bottom"
            android:layout_margin="@dimen/fab_margin"
            android:src="@drawable/ic_favorite_outline_white_24dp"
            app:borderWidth="0dp"
            app:layout_behavior="com.loaderman.samplecollect.hideonscroll.ScrollingFABBehavior"/>
</android.support.design.widget.CoordinatorLayout>

recycler_item,xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:card_view="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_gravity="center"
    android:layout_margin="8dp"
    card_view:cardCornerRadius="4dp">
    <TextView
        android:id="@+id/itemTextView"
        android:layout_width="match_parent"
        android:layout_height="?attr/listPreferredItemHeight"
        android:gravity="center_vertical"
        android:padding="8dp"
        style="@style/Base.TextAppearance.AppCompat.Body2"/>
</android.support.v7.widget.CardView>

recycler_header.xml

<?xml version="1.0" encoding="utf-8"?>
<View xmlns:android="http://schemas.android.com/apk/res/android"
      android:layout_width="match_parent"
      android:layout_height="?attr/actionBarSize"/>

效果图：

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