ViewPager OnPageChangeListener不工作

问题描述

我使用的是自定义的ViewPager，当我滑到了新的一页ViewPager.OnPageChangeListener不起作用。可能是什么原因呢？

  mPager =（WrapContentHeightViewPager）findViewById（R.id.pager）;        mPager.setOnPageChangeListener（新ViewPager.OnPageChangeListener（）{
            公共无效onPageScrollStateChanged（INT状态）{}
            公共无效onPageScrolled（INT位置，浮positionOffset，诠释positionOffsetPixels）{}            公共无效使用onPageSelected（INT位置）{
                //检查是否这是你想要的页面。
                currentFav =位置;
                Log.i（currentFav POS，currentFav +）;
            }
        }）;
 

解决方案

我使用ViewPagerIndicator库，以便按照这个图书馆，我应该已经设置页面上监听指标。

  mIndicator.setOnPageChangeListener（新ViewPager.SimpleOnPageChangeListener（）{
        @覆盖
        公共无效使用onPageSelected（INT位置）{
            doYourThing（）;
        }
    }）;
 

更新@ powder366：

在您的build.gradle文件，添加到库的依赖

 编译com.viewpagerindicator：库：2.4.1@aar
 

在顶层的build.gradle文件，添加这些：

  //顶级构建文件，您可以添加常用的配置选项，所有分项目/模块。buildscript {
    库{
        行家{URLhttp://dl.bintray.com/populov/maven}
        mavenCentral（）
        jcenter（）
    }
    依赖{
        类路径'com.android.tools.build:gradle:1.2.3        //注意：不要在这里把你的应用程序依赖关系;他们属于
        //在单个模块的build.gradle文件
    }
}allprojects {
    库{
        行家{URLhttp://dl.bintray.com/populov/maven}
        mavenCentral（）
        jcenter（）
    }
}
 

您可以将XML添加的指标如下：

 ＆LT; com.viewpagerindicator.CirclePageIndicator
                            机器人：ID =@ + ID /指示器
                            机器人：layout_width =match_parent
                            机器人：layout_height =WRAP_CONTENT
                            机器人：背景=@色/蓝
                            机器人：填充=10dip
                            应用：填充颜色=@彩色/ circleindicatorfill
                            应用：pageColor =@彩色/ circleindicatorempty
                            应用：strokeWidth =0dp/＆GT;
 

获取指标如下：

  mIndicator =（CirclePageIndicator）findViewById（R.id.indicator）;mViewPager.setAdapter（mFragmentAdapter）;mIndicator.setViewPager（mViewPager）;mIndicator
         .setOnPageChangeListener（新ViewPager.SimpleOnPageChangeListener（）{
                    公共无效onPageScrollStateChanged（INT状态）{
                    }                    公共无效onPageScrolled（INT位置，
                                               浮positionOffset，诠释positionOffsetPixels）{
                    }                    公共无效使用onPageSelected（INT位置）{                        //检查是否这是你想要的页面。
                       / * currentFav =位置;
                        Log.i（currentFav POS，currentFav +）; * /
                    }
                }）;
 

I am using a custom ViewPager and ViewPager.OnPageChangeListener doesn't work when I slide to a new page. What might be the reason?

mPager = (WrapContentHeightViewPager) findViewById(R.id.pager);

        mPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
            public void onPageScrollStateChanged(int state) {}
            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {}

            public void onPageSelected(int position) {
                // Check if this is the page you want.
                currentFav = position;
                Log.i("currentFav pos", currentFav+"");
            }
        });

解决方案

I am using ViewPagerIndicator library so according to this library, I should have set page listener onto indicator.

mIndicator.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
        @Override
        public void onPageSelected(int position) {
            doYourThing();
        }
    });

Update for @powder366:

In your build.gradle file, add library into dependencies

compile 'com.viewpagerindicator:library:2.4.1@aar'

In your top-level build.gradle file, add those:

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {
    repositories {
        maven { url "http://dl.bintray.com/populov/maven" }
        mavenCentral()
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:1.2.3'

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        maven { url "http://dl.bintray.com/populov/maven" }
        mavenCentral()
        jcenter()
    }
}

You can add indicator to your xml as following:

 <com.viewpagerindicator.CirclePageIndicator
                            android:id="@+id/indicator"
                            android:layout_width="match_parent"
                            android:layout_height="wrap_content"
                            android:background="@color/blue"
                            android:padding="10dip"
                            app:fillColor="@color/circleindicatorfill"
                            app:pageColor="@color/circleindicatorempty"
                            app:strokeWidth="0dp" />

Get indicator as following:

mIndicator = (CirclePageIndicator) findViewById(R.id.indicator);

mViewPager.setAdapter(mFragmentAdapter);

mIndicator.setViewPager(mViewPager);

mIndicator
         .setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
                    public void onPageScrollStateChanged(int state) {
                    }

                    public void onPageScrolled(int position,
                                               float positionOffset, int positionOffsetPixels) {
                    }

                    public void onPageSelected(int position) {

                        // Check if this is the page you want.
                       /* currentFav = position;
                        Log.i("currentFav pos", currentFav + "");*/
                    }
                });

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