Question

我不知道这是一个错误，还是我不应该以这种方式做事，但我试图在一个页面上包含两次viewpager而第二个viewpager永远不会出现。

ActivityMain.java

//These are my two includes in activity_main
View includeOne = findViewById(R.id.activity_main_include_primary);
View includeTwo = findViewById(R.id.activity_main_include_secondary);

//Set viewpager one
ViewPager pagerOne = (ViewPager) includeOne.findViewById(R.id.pager_viewpager);
CustomAdapter adapterOne = new CustomAdapter(getSupportFragmentManager());
pagerOne.setAdapter(adapterOne);

//set viewpager two
ViewPager pagerTwo = (ViewPager) includeTwo.findViewById(R.id.pager_viewpager);
CustomAdapter adapterTwo = new CustomAdapter(getSupportFragmentManager());
pagerTwo.setAdapter(adapterTwo);

activity_main.xml中

<include
    android:id="@+id/activity_main_include_primary"
    layout="@layout/pager"/>

<include
    android:id="@+id/activity_main_include_secondary"
    layout="@layout/pager"/>

pager.xml

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

    <android.support.v4.view.ViewPager
        android:id="@+id/pager_viewpager"
        android:layout_width="match_parent"
        android:layout_height="200dp" />
</LinearLayout>

CustomAdapter.java

public class CustomAdapter extends FragmentPagerAdapter  {

    public CustomAdapter(FragmentManager fm) {
        super(fm);
    }

    @Override
    public int getCount() {
        return 2;
    }

    @Override
    public Fragment getItem(int position) {
        switch(position){
            case 0:
                return FragmentOne.newInstance();
            default:
                return FragmentTwo.newInstance();
        }
    }
}

这两个片段是标准的。

我一整天都在尝试这个，除非我放弃包含（我不想这样做），否则我无法让第二个观看者显示出来。我使用的任何其他android视图都可以。

非常感谢任何帮助。

Answer 1

如果您想要展示2个观看者，则需要有2个不同的取景器，并将它们设置在另一个之上。

在activity_main.xml中：

<RelativeLayout 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"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    tools:context="com.example.viewpager_test.app.MainActivity">

    <include
        android:id="@+id/activity_main_include_primary"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        layout="@layout/pager_one"/>

    <include
        android:id="@+id/activity_main_include_secondary"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/activity_main_include_primary"
        layout="@layout/pager_two"/>

</RelativeLayout>

对于pager_one.xml：

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

    <android.support.v4.view.ViewPager
        android:id="@+id/pager_viewpager_one"
        android:layout_width="match_parent"
        android:layout_height="200dp" />
</LinearLayout>

对于pager_two.xml：

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

    <android.support.v4.view.ViewPager
        android:id="@+id/pager_viewpager_two"
        android:layout_width="match_parent"
        android:layout_height="200dp" />
</LinearLayout>

并在ActivityMain.java文件中将pagerOne设置为viewpager_one id，将pagerTwo设置为viewpager_two id：

ViewPager pagerOne = (ViewPager) includeOne.findViewById(R.id.pager_viewpager_one);
...

ViewPager pagerTwo = (ViewPager) includeTwo.findViewById(R.id.pager_viewpager_two);
...

使用包含布局的ViewPager

1 个答案: