android - 处理 PagerTitleStrip click in compatibiliy Fragment-based ViewPager

Question

我有兼容性ViewPager带有嵌入式 PagerTitleStrip元素，它工作正常，但单击 PagerTitleStrip 不会按预期切换到相应的 View 。我查看了文档，但该小部件没有任何内置方法可将 onClickListeners 附加到 PagerTitleStrip 对象。这似乎有点奇怪，因为这可能是大多数人所期望的。

所以问题是如何使标题栏可点击？

我也在尝试找出是否有一种方法可以在不添加 TabHost 的情况下在选定的标题条下显示粗下划线。

代码如下:

主布局view_pager.xml:

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

    <android.support.v4.view.ViewPager
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/my_view_pager"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >

        <android.support.v4.view.PagerTitleStrip
            android:id="@+id/pager_title_strip"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_gravity="top"
            android:background="#ccc"
            android:textColor="#fff" />
    </android.support.v4.view.ViewPager>

</LinearLayout>

进入 ViewPager 的两个 fragment 布局:

fragment_connect.xml(第二个是相同的，所以不包括在内)

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

    <TextView
        android:id="@+id/text_view_connect"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="connect"
        android:textAppearance="?android:attr/textAppearanceLarge" />
</LinearLayout>

主要 Activity 类StandardViewPagerActivity.java:

package com.example.standardviewpager;

import java.util.List;
import java.util.Vector;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.view.PagerTitleStrip;
import android.support.v4.view.ViewPager;
import android.view.Menu;

public class StandardViewPagerActivity extends FragmentActivity {

    private MyPagerAdapter pagerAdapter;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.view_pager);
        ViewPager myPager = (ViewPager) findViewById(R.id.my_view_pager);
        PagerTitleStrip pagerStrip = (PagerTitleStrip) findViewById(R.id.pager_title_strip);
        // TODO: add underline for selected title strip
        myPager.setAdapter(pagerAdapter);
        myPager.setCurrentItem(0);
        initialisePaging();
    }

    private void initialisePaging() {

        List<Fragment> fragments = new Vector<Fragment>();
        fragments.add(Fragment.instantiate(this, ConnectFragment.class.getName()));
        fragments.add(Fragment.instantiate(this, ProfilesFragment.class.getName()));
        this.pagerAdapter = new MyPagerAdapter(super.getSupportFragmentManager(), fragments);
        ViewPager pager = (ViewPager) super.findViewById(R.id.my_view_pager);
        pager.setAdapter(this.pagerAdapter);
    }
}

适配器类MyPagerAdapter.java:

package com.example.standardviewpager;

import java.util.List;

import android.os.Parcelable;
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.view.LayoutInflater;
import android.view.View;

public class MyPagerAdapter extends FragmentPagerAdapter {

    private List<Fragment> fragments;

    public MyPagerAdapter(FragmentManager supportFragmentManager, List<Fragment> fragments) {
        super(supportFragmentManager);
        this.fragments = fragments;
    }

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

    @Override
    public void destroyItem(View arg0, int arg1, Object arg2) {
        ((ViewPager) arg0).removeView((View) arg2);
    }

    @Override
    public Parcelable saveState() {
        return null;
    }

    @Override
    public CharSequence getPageTitle(int position) {
        return String.format("Title %d", position);
    }

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

最后，两个相同的 Fragment 实现，仅包括第一个 - ConnectFragment.java。

package com.example.standardviewpager;

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

public class ConnectFragment extends Fragment {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        LinearLayout layout = (LinearLayout) inflater.inflate(R.layout.fragment_connect, container, false);
        TextView textView = (TextView) layout.findViewById(R.id.text_view_connect);
        textView.setText("onCreateView() Connect");
        return (View)layout;
        }
}

Answer 1

So the question is how would I make the title strip clickable?

您 fork 它并制作您自己的可点击实现。或者，您切换到可单击的 PagerTabStrip。或者，您切换到 ViewPagerIndicator 之一指标，恰好是可点击的并且具有您喜欢的外观。

引用 the documentation for PagerTitleStrip :

PagerTitleStrip is a non-interactive indicator of the current, next, and previous pages of a ViewPager... For an interactive indicator, see PagerTabStrip.