我有一个带有嵌入式PagerTitleStrip元素的兼容性ViewPager,它工作正常,但点击 PagerTitleStrip 并没有按预期切换到相应的视图。我查看了文档,但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?
我还试图弄清楚是否有一种方法可以在所选标题条下显示粗下划线而不添加 TabHost 如果可能的话。
这是代码:
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 的两个片段布局:
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>
主要活动类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;
}
}