拦截tablayout 点击事件，不触发viewpaper滚动例如登陆检测等场景

app架构是底下有四个tab,点击tab切换fragment，但是产品要求，点击tab之前需要检测是否登陆，如果未登录，直接跳转登陆提示，页面不进行切换
首先是架构，我们使用TabLayout + Viewpaper + Fragment 来实现，登录提示，只要拿到TabLayout的Tab 监听它的OnClickListener，可是。。。。转折来的太突然。。。public static final class Tab {} 不是view，山穷水复疑无路，柳暗花明又一村。Tab里面还有这么几个View 或者 viewgroup：
TabLayout mParent;
TabView mView;
private View mCustomView;
发现TabView 获取不到，但是能够设置和获取到mCustomView，我们通过Android device monitor 查看布局
2017-07-02_221358.png
还有第二个需求，就是不切换界面，mTabLayout.setupWithViewPager(mViewPager);这个会自动为我们关联tab并处理切换逻辑等，但是我们需要控制，所以不能设置这个，只能自己去实现tab 的点击效果，为了控制viewpaper左右滑动，发现并没有提供方法。。。。但是本质还是滑动事件的处理，重写onTouchEvent 返回true就可以了。
思路和解决方法有了，接下来就是具体实现了，具体看代码把。
import android.content.Context;
import android.graphics.Color;
import android.os.Bundle;
import android.support.annotation.Nullable;
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.app.FragmentStatePagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import com.example.philos.myandroidblogdemo.R;
import java.util.ArrayList;
import java.util.List;
 * Created by Philos on 2017/6/24.
public class TablayoutClickCheckActivity extends AppCompatActivity {
    private NoScrollViewPager mViewPager;
    private MyPagerAdapter mPagerAdapter;
    private TabLayout mTabLayout;
    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_tab_click_check);
        mViewPager = (NoScrollViewPager) findViewById(R.id.viewpaper);
        //禁止viewpaper滚动，通过设置setCurrentItem 来进行切换
        mViewPager.setScroll(false);
        mTabLayout = (TabLayout) findViewById(R.id.tab);
        //这里为了方便，直接new，在MyPagerAdapter的构造函数传进去
        final List<Fragment> viewList = new ArrayList<Fragment>();// 将要分页显示的View装入数组中
        for (int i = 0; i < 4; i++) {
            viewList.add(FragmentOne.getInstance(i));
        mPagerAdapter = new MyPagerAdapter(getSupportFragmentManager(), viewList);
        mViewPager.setOffscreenPageLimit(3);
        //监听切换事件，设置tab的选中和颜色
        mViewPager.addOnPageChangeListener(mOnPageChangeListener);
        mViewPager.setAdapter(mPagerAdapter);
        //为TabLayout设置ViewPager,这里不能这样设置了
//        mTabLayout.setupWithViewPager(mViewPager);
        //自定义tab的布局
        for (int i = 0; i < mPagerAdapter.getCount(); i++) {
            //setupWithViewPager 的话 tab 都帮我们初始化好了，但是没有就需要newTab
//            TabLayout.Tab tab = mTabLayout.getTabAt(i);
            TabLayout.Tab tab = mTabLayout.newTab();
            if (tab != null) {
                tab.setCustomView(mPagerAdapter.getTabView(i));
                if (tab.getCustomView() != null) {
                    View tabView = (View) tab.getCustomView().getParent(); //重点是这一句
                    tabView.setTag(i);
                    tabView.setOnClickListener(mTabOnClickListener);
            //这里还需要自己加进去
            mTabLayout.addTab(tab, i);
        //默认选中第一个
        setTabSelected(mTabLayout.getTabAt(0), 0, true);
    public class MyPagerAdapter extends FragmentStatePagerAdapter {
        List<Fragment> mFragmentList;
        public MyPagerAdapter(FragmentManager fm, List<Fragment> list) {
            super(fm);
            this.mFragmentList = list;
            for (int i = 0; i < list.size(); i++) {
                TextView textView = new TextView(TablayoutClickCheckActivity.this);
                textView.setText("Tab" + (i + 1));
                mTabViewList.add(textView);
        @Override
        public int getCount() {
            return 4;
        @Override
        public Fragment getItem(int position) {
            return mFragmentList.get(position);
        private List<View> mTabViewList = new ArrayList<View>();
        public View getTabView(int position) {
            return mTabViewList.get(position);
        //重写这个方法，将设置每个Tab的标题
        @Override
        public CharSequence getPageTitle(int position) {
            return ((TextView) mTabViewList.get(position)).getText();
    ViewPager.OnPageChangeListener mOnPageChangeListener = new ViewPager.OnPageChangeListener() {
        @Override
        public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
        @Override
        public void onPageSelected(int position) {
//            mSelectPos = position;
            setTabSelected(mTabLayout.getTabAt(position), position, true);
            int count = mTabLayout.getTabCount();
            for (int i = 0; i < count; i++) {
                if (i != position) {
                    setTabSelected(mTabLayout.getTabAt(i), i, false);
        @Override
        public void onPageScrollStateChanged(int state) {
    private void setTabSelected(TabLayout.Tab tabAt, int position, boolean b) {
        TextView textView = ((TextView) tabAt.getCustomView());
        if (b)
            textView.setTextColor(Color.RED);
            textView.setTextColor(Color.BLACK);
    private boolean isAccountLogin = false;
     * 拦截TabLayout重设Tab点击事件，在点击“消息”或者“我”的tab时检查有没有登录，没有则跳登录页面
    private View.OnClickListener mTabOnClickListener = new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            int pos = (int) view.getTag();
            //没有登录时选中“消息”或者“我”的tab时跳登录页面
            if ((pos == 1 || pos == 2 || pos == 0) && !isAccountLogin) {
                new AlertDialog.Builder(TablayoutClickCheckActivity.this)
                        .setMessage("你还未登录，立即登录？").setTitle("提示").show();
                return;
            } else {
                TabLayout.Tab tab = mTabLayout.getTabAt(pos);
                if (tab != null) {
                    tab.select();
                mViewPager.setCurrentItem(pos);
布局文件activity_tab_click_check.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:orientation="vertical"
    android:background="#FFcccccc"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <com.example.philos.myandroidblogdemo.tablayout.NoScrollViewPager
        android:id="@+id/viewpaper"
        android:background="@color/colorAccent"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"/>
    <android.support.design.widget.TabLayout
        android:id="@+id/tab"
        android:layout_width="match_parent"
        android:layout_height="45dp"
        app:tabIndicatorHeight="0dp"
        app:tabMode="fixed"
        app:tabSelectedTextColor="#FF4081"
        app:tabTextColor="#000"
        android:background="#ffffff"></android.support.design.widget.TabLayout>
</LinearLayout>
可以控制滚动的ViewPaper  NoScrollViewPager
import android.content.Context;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;
import android.view.MotionEvent;
 * Created by Philos on 2017/7/2.
public class NoScrollViewPager  extends ViewPager {
    private boolean isScroll;
    public NoScrollViewPager(Context context, AttributeSet attrs){
        super(context, attrs);
    public NoScrollViewPager(Context context) {
        super(context);
//    /**
//     * 1.dispatchTouchEvent一般情况不做处理
//     *,如果修改了默认的返回值,子孩子都无法收到事件
//     */
//    @Override
//    public boolean dispatchTouchEvent(MotionEvent ev) {
//        return super.dispatchTouchEvent(ev);   // return true;不行
//    }
     * 如果不需要嵌套之类的处理，不用处理这个情况
     * 是否拦截
     * 拦截:会走到自己的onTouchEvent方法里面来
     * 不拦截:事件传递给子孩子
    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {
        if (isScroll){
            return super.onInterceptTouchEvent(ev);
        }else{
            return false;
     * 是否消费事件
     * 消费:事件就结束
     * 不消费:往父控件传
    @Override
    public boolean onTouchEvent(MotionEvent ev) {
        if (isScroll){
            return super.onTouchEvent(ev);
        }else {
            return true;// 消费,拦截事件，就不会让
    public void setScroll(boolean scroll) {
        isScroll = scroll;
FragmentOne
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import com.example.philos.myandroidblogdemo.R;
 * Created by Philos on 2017/6/24.
public class FragmentOne extends Fragment {
    private static final String EXTRA_KEY_TYPE = "EXTRA_KEY_TYPE";
    private int position = 0;
    private String[] titles = {"页面1", "页面2", "页面3", "页面4"};
    //因为四个fragment的布局一样只是中间的提示文字不一样，封装下用公用一个就可以了
    public static FragmentOne getInstance(int type){
        FragmentOne fragmentOne = new FragmentOne();
        Bundle bundle = new Bundle();
        bundle.putInt(EXTRA_KEY_TYPE, type);
        fragmentOne.setArguments(bundle);
        return fragmentOne;
    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        Bundle bundle = getArguments();
        if (bundle != null) {
            position = bundle.getInt(EXTRA_KEY_TYPE, 0);
        View view =  inflater.inflate(R.layout.fragment_one,container,false);
        TextView textView = (TextView) view.findViewById(R.id.text1);
        textView.setText(titles[position]);
        return view;
fragment_one.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:gravity="center"
    android:background="@color/colorAccent"
    xmlns:tools="http://schemas.android.com/tools"
    tools:context=".tablayout.FragmentOne">
    <TextView
        android:id="@+id/text1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="唐僧"
拦截tablayout 点击事件，不触发viewpaper滚动 例如登陆检测等场景

拦截tablayout 点击事件，不触发viewpaper滚动例如登陆检测等场景
