Android Studio使用ViewPager+Fragment实现仿微信滑动切换界面

前言

微信的滑动切换获得大家一致好评，在我们开发的过程中我们也经常模仿微信的导航效果。

• 首先看下效果图

效果还算不错，可以滑动切换和点击切换，微信界面用listview展示数据,通讯录界面用的recyclerview展示数据，在接下来就带着大家一一分析。

• activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              android:orientation="vertical">

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:background="@color/blue">

        <TextView
            android:id="@+id/title"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerInParent="true"
            android:text="微信"
            android:textColor="@android:color/white"
            android:textSize="20sp"/>
    RelativeLayout>

    <android.support.v4.view.ViewPager
        android:id="@+id/mainViewPager"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"/>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="40dp"
        android:layout_marginTop="1dp"
        android:background="@android:color/white"
        android:baselineAligned="false"
        android:gravity="center_vertical"
        android:orientation="horizontal"
        android:paddingBottom="5dp"
        android:paddingTop="5dp">

        <TextView
            android:id="@+id/item_weixin"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:gravity="center_horizontal|center_vertical"
            android:text="微信"
            android:textColor="@drawable/main_tab_text_color"
            android:textSize="15dp"/>

        <TextView
            android:id="@+id/item_tongxunlu"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:gravity="center_horizontal|center_vertical"
            android:text="通讯录"
            android:textColor="@drawable/main_tab_text_color"
            android:textSize="15dp"/>

        <TextView
            android:id="@+id/item_faxian"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:gravity="center_horizontal|center_vertical"
            android:text="发现"
            android:textColor="@drawable/main_tab_text_color"
            android:textSize="15dp"/>

        <TextView
            android:id="@+id/item_me"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:gravity="center_horizontal|center_vertical"
            android:text="我"
            android:textColor="@drawable/main_tab_text_color"
            android:textSize="15dp"/>
    LinearLayout>

LinearLayout>

主布局内容很明了,最外层一个垂直的LinearLayout，里面依次排列着标题栏,ViewPager,和导航栏。

• MainActivity.class

package com.cc.testdemo;

import android.graphics.Color;
import android.os.Bundle;
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.view.View;
import android.widget.TextView;

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

public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    private TextView title, item_weixin, item_tongxunlu, item_faxian, item_me;
    private ViewPager vp;
    private OneFragment oneFragment;
    private TwoFragment twoFragment;
    private ThreeFragment threeFragment;
    private FouthFragment fouthFragmen;
    private List mFragmentList = new ArrayList();
    private FragmentAdapter mFragmentAdapter;

    String[] titles = new String[]{"微信", "通讯录", "发现", "我"};

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //去除工具栏
        getSupportActionBar().hide();
        setContentView(R.layout.activity_main);
        initViews();

        mFragmentAdapter = new FragmentAdapter(this.getSupportFragmentManager(), mFragmentList);
        vp.setOffscreenPageLimit(4);//ViewPager的缓存为4帧
        vp.setAdapter(mFragmentAdapter);
        vp.setCurrentItem(0);//初始设置ViewPager选中第一帧
        item_weixin.setTextColor(Color.parseColor("#66CDAA"));

        //ViewPager的监听事件
        vp.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
            @Override
            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

            }

            @Override
            public void onPageSelected(int position) {
                /*此方法在页面被选中时调用*/
                title.setText(titles[position]);
                changeTextColor(position);
            }

            @Override
            public void onPageScrollStateChanged(int state) {
                /*此方法是在状态改变的时候调用，其中arg0这个参数有三种状态（0，1，2）。
                arg0 ==1的时辰默示正在滑动，
                arg0==2的时辰默示滑动完毕了，
                arg0==0的时辰默示什么都没做。*/
            }
        });
    }

    /**
     * 初始化布局View
     */
    private void initViews() {
        title = (TextView) findViewById(R.id.title);
        item_weixin = (TextView) findViewById(R.id.item_weixin);
        item_tongxunlu = (TextView) findViewById(R.id.item_tongxunlu);
        item_faxian = (TextView) findViewById(R.id.item_faxian);
        item_me = (TextView) findViewById(R.id.item_me);

        item_weixin.setOnClickListener(this);
        item_tongxunlu.setOnClickListener(this);
        item_faxian.setOnClickListener(this);
        item_me.setOnClickListener(this);

        vp = (ViewPager) findViewById(R.id.mainViewPager);
        oneFragment = new OneFragment();
        twoFragment = new TwoFragment();
        threeFragment = new ThreeFragment();
        fouthFragmen = new FouthFragment();
        //给FragmentList添加数据
        mFragmentList.add(oneFragment);
        mFragmentList.add(twoFragment);
        mFragmentList.add(threeFragment);
        mFragmentList.add(fouthFragmen);
    }

    /**
     * 点击底部Text 动态修改ViewPager的内容
     */
    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.item_weixin:
                vp.setCurrentItem(0, true);
                break;
            case R.id.item_tongxunlu:
                vp.setCurrentItem(1, true);
                break;
            case R.id.item_faxian:
                vp.setCurrentItem(2, true);
                break;
            case R.id.item_me:
                vp.setCurrentItem(3, true);
                break;
        }
    }


    public class FragmentAdapter extends FragmentPagerAdapter {

        List fragmentList = new ArrayList();

        public FragmentAdapter(FragmentManager fm, List fragmentList) {
            super(fm);
            this.fragmentList = fragmentList;
        }

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

        @Override
        public int getCount() {
            return fragmentList.size();
        }

    }

    /*
     *由ViewPager的滑动修改底部导航Text的颜色
     */
    private void changeTextColor(int position) {
        if (position == 0) {
            item_weixin.setTextColor(Color.parseColor("#66CDAA"));
            item_tongxunlu.setTextColor(Color.parseColor("#000000"));
            item_faxian.setTextColor(Color.parseColor("#000000"));
            item_me.setTextColor(Color.parseColor("#000000"));
        } else if (position == 1) {
            item_tongxunlu.setTextColor(Color.parseColor("#66CDAA"));
            item_weixin.setTextColor(Color.parseColor("#000000"));
            item_faxian.setTextColor(Color.parseColor("#000000"));
            item_me.setTextColor(Color.parseColor("#000000"));
        } else if (position == 2) {
            item_faxian.setTextColor(Color.parseColor("#66CDAA"));
            item_weixin.setTextColor(Color.parseColor("#000000"));
            item_tongxunlu.setTextColor(Color.parseColor("#000000"));
            item_me.setTextColor(Color.parseColor("#000000"));
        } else if (position == 3) {
            item_me.setTextColor(Color.parseColor("#66CDAA"));
            item_weixin.setTextColor(Color.parseColor("#000000"));
            item_tongxunlu.setTextColor(Color.parseColor("#000000"));
            item_faxian.setTextColor(Color.parseColor("#000000"));
        }
    }
}

MainActivity.class里面主要是处理滑动切换的逻辑处理，切换后导航菜单字体颜色的切换,代码上注释也比较清晰，就不多做解释。

• Fragement

package com.cc.testdemo;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class FouthFragment extends Fragment {
    public FouthFragment() {
        // Required empty public constructor
    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_fouth, container, false);
    }
}

• fragment.xml

<FrameLayout 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=".FouthFragment">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:text="'我'界面"
        android:textSize="25sp"/>
FrameLayout>

这里面有4个fragment，代码一样，fragment.xml里面也只有一个TextView,上面的代码就可以实现滑动切换和点击切换。

• 上述代码的效果如下:

好了现在我们来加上数据分别用listview和recyclerview来实现，recycylerview是谷歌力推的替代listview的控件。

• Onefragment页面展示用Listview显示:
  修改后的Onefragment.xml代码：

package com.cc.testdemo;

import android.os.AsyncTask;
import android.os.Bundle;
import android.os.SystemClock;
import android.support.v4.app.Fragment;
import android.support.v4.widget.SwipeRefreshLayout;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;

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

import butterknife.BindView;
import butterknife.ButterKnife;

public class OneFragment extends Fragment {


    @BindView(R.id.lv)
    ListView lv;
    @BindView(R.id.srl)
    SwipeRefreshLayout mSwipeRefreshLayout;

    private List stringList;
    private ArrayAdapter lvAdapter;


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View view = inflater.inflate(R.layout.fragment_one, container, false);
        ButterKnife.bind(this, view);
        initData();
        return view;
    }

    private void initData() {
        stringList = new ArrayList();
        for (int i = 0; i < 20; i++) {
            stringList.add(String.valueOf(i));
        }
        lvAdapter = new ArrayAdapter(getActivity(), android.R.layout.simple_list_item_1, stringList);
        lv.setAdapter(lvAdapter);

        lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView adapterView, View view, int i, long l) {
                Toast.makeText(getActivity(), stringList.get(i).toString(), Toast.LENGTH_SHORT).show();
            }
        });


        lv.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
            @Override
            public boolean onItemLongClick(AdapterView adapterView, View view, int i, long l) {
                Toast.makeText(getActivity(), "long click:" + stringList.get(i).toString(), Toast.LENGTH_SHORT).show();
                return true;
            }
        });


        //初始化下拉控件颜色
        mSwipeRefreshLayout.setColorSchemeResources(android.R.color.holo_blue_bright, android.R.color.holo_green_light,
                android.R.color.holo_orange_light, android.R.color.holo_red_light);

        mSwipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
            @Override
            public void onRefresh() {
                new AsyncTask() {

                    @Override
                    protected Void doInBackground(Void... voids) {
                        SystemClock.sleep(2000);
                        return null;
                    }

                    @Override
                    protected void onPostExecute(Void aVoid) {
                        Toast.makeText(getActivity(), "下拉刷新成功", Toast.LENGTH_SHORT).show();
                        mSwipeRefreshLayout.setRefreshing(false);
                    }
                }.execute();
            }
        });
    }
}

OneFragment里面代码就是用Listview展示模拟的数据，listview外层有一个swipeRefreshLayout下拉刷新控件。

• fragment_one.xml

"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="com.cc.testdemo.OneFragment">

    .support.v4.widget.SwipeRefreshLayout
        android:id="@+id/srl"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        "@+id/lv"
            android:layout_width="match_parent"
            android:layout_height="match_parent">

    .support.v4.widget.SwipeRefreshLayout>

OneFragment的效果图:

好了上述知识大家都很熟悉，现在来看下重点的recyclerview替代listview显示数据。

RecyclerView的使用

RecyclerView出现已经有一段时间了，相信大家肯定不陌生了，大家可以通过导入support-v7对其进行使用。
据官方的介绍，该控件用于在有限的窗口中展示大量数据集，其实这样功能的控件我们并不陌生，例如：ListView、GridView。
那么有了ListView、GridView为什么还需要RecyclerView这样的控件呢？整体上看RecyclerView架构，提供了一种插拔式的体验，高度的解耦，异常的灵活，通过设置它提供的不同LayoutManager，ItemDecoration , ItemAnimator实现令人瞠目的效果。

你想要控制其显示的方式，请通过布局管理器LayoutManager
你想要控制Item间的间隔（可绘制），请通过ItemDecoration
你想要控制Item增删的动画，请通过ItemAnimator

详细的使用请参考:http://blog.csdn.net/lmj623565791/article/details/45059587

现在我们就用TwoFragment页面来使用recyclerview展示数据:

TwoFragment.class代码:

package com.cc.testdemo;


import android.os.Bundle;
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 android.widget.Toast;

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

import butterknife.BindView;
import butterknife.ButterKnife;

public class TwoFragment extends Fragment implements MyRecyclerViewOnclickInterface {


    @BindView(R.id.id_recyclerview)
    RecyclerView mRecyclerview;

    private MyRecyclerViewAdapter mAdapter;
    private List stringList;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View view = inflater.inflate(R.layout.fragment_two, container, false);
        ButterKnife.bind(this, view);
        initData();
        return view;
    }

    private void initData() {
        stringList = new ArrayList();
        for (int i = 0; i < 20; i++) {
            stringList.add(String.valueOf(i));
        }
        mAdapter = new MyRecyclerViewAdapter(getActivity(), stringList);
        //设置布局管理器
        mRecyclerview.setLayoutManager(new LinearLayoutManager(getActivity()));
        //设置adapter
        mRecyclerview.setAdapter(mAdapter);
        //添加分割线
        mRecyclerview.addItemDecoration(new DividerItemDecoration(getActivity(), DividerItemDecoration.VERTICAL_LIST));
        mAdapter.setOnItemClickLitener(this);
    }

    @Override
    public void onItemClick(View view, int position) {
        Toast.makeText(getActivity(), stringList.get(position), Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onItemLongClick(View view, int position) {
        Toast.makeText(getActivity(), "onItemLongClick" + stringList.get(position), Toast.LENGTH_SHORT).show();
    }
}

• fragment_two.xml

<FrameLayout 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="com.cc.testdemo.TwoFragment">

    

    <android.support.v7.widget.RecyclerView
        android:id="@+id/id_recyclerview"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

FrameLayout>

• MyRecyclerViewAdapter

package com.cc.testdemo;

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.List;

/**
 * Created by CC on 2016/12/27.
 */
public class MyRecyclerViewAdapter extends RecyclerView.Adapter<MyRecyclerViewAdapter.MyViewHolder> {


    private Context context;
    private List mDatas;

    private MyRecyclerViewOnclickInterface mOnItemClickLitener;

    public void setOnItemClickLitener(MyRecyclerViewOnclickInterface mOnItemClickLitener) {
        this.mOnItemClickLitener = mOnItemClickLitener;
    }

    public MyRecyclerViewAdapter(Context context, List mDatas) {
        this.context = context;
        this.mDatas = mDatas;
    }

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

    @Override
    public void onBindViewHolder(final MyViewHolder holder, int position) {
        holder.tv.setText(mDatas.get(position));
        // 如果设置了回调，则设置点击事件
        if (mOnItemClickLitener != null) {
            //点击监听
            holder.itemView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    int pos = holder.getLayoutPosition();
                    mOnItemClickLitener.onItemClick(holder.itemView, pos);
                }
            });

            //长按监听
            holder.itemView.setOnLongClickListener(new View.OnLongClickListener() {
                @Override
                public boolean onLongClick(View v) {
                    int pos = holder.getLayoutPosition();
                    mOnItemClickLitener.onItemLongClick(holder.itemView, pos);
                    //返回true可以让长按事件被消耗，避免出发点击事件
                    return true;
                }
            });
        }

    }

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

    class MyViewHolder extends RecyclerView.ViewHolder {

        TextView tv;

        public MyViewHolder(View view) {
            super(view);
            tv = (TextView) view.findViewById(R.id.tv);
        }
    }
}

• MyRecyclerViewOnclickInterface

package com.cc.testdemo;

import android.view.View;

/**
 * Created by CC on 2016/12/27.
 */
public interface MyRecyclerViewOnclickInterface {

    void onItemClick(View view, int position);
    void onItemLongClick(View view, int position);
}

MyRecyclerViewOnclickInterface初始化接口方法，由于recyclerview暂时没有实现点击处理，所以只能通过手动添加回调。

• DividerItemDecoration

package com.cc.testdemo;

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;

/**
 * This class is from the v7 samples of the Android SDK. It's not by me!
 * 

 * See the license above for details.
 */
public class DividerItemDecoration extends RecyclerView.ItemDecoration {

    private static final int[] ATTRS = new int[]{
            android.R.attr.listDivider
    };

    public static final int HORIZONTAL_LIST = LinearLayoutManager.HORIZONTAL;

    public static final int VERTICAL_LIST = LinearLayoutManager.VERTICAL;

    private Drawable mDivider;

    private int mOrientation;

    public DividerItemDecoration(Context context, int orientation) {
        final TypedArray a = context.obtainStyledAttributes(ATTRS);
        mDivider = a.getDrawable(0);
        a.recycle();
        setOrientation(orientation);
    }

    public void setOrientation(int orientation) {
        if (orientation != HORIZONTAL_LIST && orientation != VERTICAL_LIST) {
            throw new IllegalArgumentException("invalid orientation");
        }
        mOrientation = orientation;
    }

    @Override
    public void onDraw(Canvas c, RecyclerView parent) {
//        Log.v("recyclerview - itemdecoration", "onDraw()");

        if (mOrientation == VERTICAL_LIST) {
            drawVertical(c, parent);
        } else {
            drawHorizontal(c, parent);
        }

    }


    public void drawVertical(Canvas c, RecyclerView parent) {
        final int left = parent.getPaddingLeft();
        final int right = parent.getWidth() - parent.getPaddingRight();

        final int childCount = parent.getChildCount();
        for (int i = 0; i < childCount; i++) {
            final View child = parent.getChildAt(i);
            android.support.v7.widget.RecyclerView v = new android.support.v7.widget.RecyclerView(parent.getContext());
            final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child
                    .getLayoutParams();
            final int top = child.getBottom() + params.bottomMargin;
            final int bottom = top + mDivider.getIntrinsicHeight();
            mDivider.setBounds(left, top, right, bottom);
            mDivider.draw(c);
        }
    }

    public void drawHorizontal(Canvas c, RecyclerView parent) {
        final int top = parent.getPaddingTop();
        final int bottom = parent.getHeight() - parent.getPaddingBottom();

        final int childCount = parent.getChildCount();
        for (int i = 0; i < childCount; i++) {
            final View child = parent.getChildAt(i);
            final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child
                    .getLayoutParams();
            final int left = child.getRight() + params.rightMargin;
            final int right = left + mDivider.getIntrinsicHeight();
            mDivider.setBounds(left, top, right, bottom);
            mDivider.draw(c);
        }
    }

    @Override
    public void getItemOffsets(Rect outRect, int itemPosition, RecyclerView parent) {
        if (mOrientation == VERTICAL_LIST) {
            outRect.set(0, 0, 0, mDivider.getIntrinsicHeight());
        } else {
            outRect.set(0, 0, mDivider.getIntrinsicWidth(), 0);
        }
    }
}

DividerItemDecoration该类很好的实现了RecyclerView添加分割线（当使用LayoutManager为LinearLayoutManager时）。

最后附上完整的代码:http://download.csdn.net/detail/qq_33792946/9722637