addOnPageChangeListener未定义

本文介绍了addOnPageChangeListener未定义的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我已经undefined.Here从网上下载一个Github.I code不能运行program.The问题是方法的 addOnPageChangeListener 是的错误：

  

该方法addOnPageChangeListener（TabLayout.TabLayoutOnPageChangeListener）是未定义的类型ViewPager

我应该怎么办？我应该用另一种方法？这里的code：

进口android.support.design.widget.CollapsingToolbarLayout;进口android.support.design.widget.CoordinatorLayout;进口android.support.design.widget.FloatingActionButton;进口android.support.design.widget.Snackbar;进口android.support.design.widget.TabLayout;进口android.support.v4.app.Fragment;进口android.support.v4.app.FragmentManager;进口android.support.v4.app.FragmentStatePagerAdapter;进口android.support.v4.view.ViewPager;进口android.support.v4.widget.DrawerLayout;进口android.support.v7.app.ActionBarDrawerToggle;进口android.support.v7.app.AppCompatActivity;进口的java.util.ArrayList;公共类FourthActivity扩展AppCompatActivity {//需要此与小吃吧链接私人CoordinatorLayout mCoordinator;//需要此设置应用栏的标题私人CollapsingToolbarLayout mCollapsingToolbarLayout;私人FloatingActionButton mF​​ab;私人工具栏mToolbar;私人DrawerLayout mDrawerLayout;私人ActionBarDrawerToggle mDrawerToggle;私人ViewPager mPager;私人YourPagerAdapter mAdapter;私人TabLayout mTab​​Layout;@覆盖保护无效的onCreate（捆绑savedInstanceState）{    super.onCreate（savedInstanceState）;    的setContentView（R.layout.activity_fourth）;    mCoordinator =（CoordinatorLayout）findViewById（R.id.root_coordinator）;    mDrawerToggle =新ActionBarDrawerToggle（这一点，mDrawerLayout，mToolbar，R.string.drawer_open，R.string.drawer_close）;    mDrawerLayout.setDrawerListener（mDrawerToggle）;    mDrawerToggle.syncState（）;    mTabLayout =（TabLayout）findViewById（R.id.tab_layout）;    mAdapter =新YourPagerAdapter（getSupportFragmentManager（））;    mPager =（ViewPager）findViewById（R.id.view_pager）;    mPager.setAdapter（mAdapter）;    //注意如何与寻呼机适配器上的标签布局链接    mTabLayout.setTabsFromPagerAdapter（mAdapter）;    //注意标签布局ADN查看传呼机对象的链接方式    mTabLayout.setupWithViewPager（mPager）;    mPager.addOnPageChangeListener（新TabLayout.TabLayoutOnPageChangeListener（mTabLayout））;    mFab.setOnClickListener（新View.OnClickListener（）{        @覆盖        公共无效的onClick（视图v）{            //注意如何协调布局对象在这里使用            Snackbar.make（mCoordinator，FAB单击的Snackbar.LENGTH_SHORT）.setAction（DISMISS，NULL）.show（）;        }    }）;    //注意标题是如何设置上合群工具栏布局，而不是工具栏    mCollapsingToolbarLayout.setTitle（getResources（）的getString（R.string.title_activity_fourth））;}

解决方案

找到你的build.gradle支持Android-V4库的依赖，升级版本22.2.1或23.0.1，该行看起来像这样

编译com.android.support:support-v4:23.0.1

I have downloaded a code from Github.I can not run the program.The problem is the method addOnPageChangeListener is undefined.Here's the error:

The method addOnPageChangeListener(TabLayout.TabLayoutOnPageChangeListener) is undefined for the type ViewPager

What should i do? Should I use another method? Here's the code:

import android.support.design.widget.CollapsingToolbarLayout; import android.support.design.widget.CoordinatorLayout; import android.support.design.widget.FloatingActionButton; import android.support.design.widget.Snackbar; import android.support.design.widget.TabLayout; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentManager; import android.support.v4.app.FragmentStatePagerAdapter; import android.support.v4.view.ViewPager; import android.support.v4.widget.DrawerLayout; import android.support.v7.app.ActionBarDrawerToggle; import android.support.v7.app.AppCompatActivity; import java.util.ArrayList; public class FourthActivity extends AppCompatActivity { // Need this to link with the Snackbar private CoordinatorLayout mCoordinator; //Need this to set the title of the app bar private CollapsingToolbarLayout mCollapsingToolbarLayout; private FloatingActionButton mFab; private Toolbar mToolbar; private DrawerLayout mDrawerLayout; private ActionBarDrawerToggle mDrawerToggle; private ViewPager mPager; private YourPagerAdapter mAdapter; private TabLayout mTabLayout; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_fourth); mCoordinator = (CoordinatorLayout) findViewById(R.id.root_coordinator); mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout, mToolbar, R.string.drawer_open, R.string.drawer_close); mDrawerLayout.setDrawerListener(mDrawerToggle); mDrawerToggle.syncState(); mTabLayout = (TabLayout) findViewById(R.id.tab_layout); mAdapter = new YourPagerAdapter(getSupportFragmentManager()); mPager = (ViewPager) findViewById(R.id.view_pager); mPager.setAdapter(mAdapter); //Notice how the Tab Layout links with the Pager Adapter mTabLayout.setTabsFromPagerAdapter(mAdapter); //Notice how The Tab Layout adn View Pager object are linked mTabLayout.setupWithViewPager(mPager); mPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(mTabLayout)); mFab.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { //Notice how the Coordinator Layout object is used here Snackbar.make(mCoordinator, "FAB Clicked", Snackbar.LENGTH_SHORT).setAction("DISMISS", null).show(); } }); //Notice how the title is set on the Collapsing Toolbar Layout instead of the Toolbar mCollapsingToolbarLayout.setTitle(getResources().getString(R.string.title_activity_fourth)); }

解决方案

Find your dependency of android support-v4 library in build.gradle, upgrade the version to 22.2.1 or 23.0.1, the line looks like this

compile 'com.android.support:support-v4:23.0.1'