实现使用支持库一TabListener [英] Implementing a TabListener using the Support Library

问题描述

我想实现标签导航，但是我想确保人们有旧版本的Andr​​oid系统仍然可以使用我的应用程序。

记住ATM的应用程序是相当简单的，我只是希望能够了解如何实现布局，然后我会添加缺少位。

不管怎样，我有一个集装箱的活动，扩展片段活动（以确保兼容性），而这项活动创建使用动作条（我相信我的问题在于这里TabView的）。该应用程序将尝试创建三个选项卡并将其添加到动作条，我想，以确保用户可以来回滚动使用横向导航。

下面是TabListener我想实现：

 公共静态类TabListener＆LT;吨延伸片断＆gt;实现ActionBar.TabListener {

    私人片段mFragment;
    私人最终活动mActivity;
    私人最终字符串MTAG;
    私人最终类别＆LT; T＆GT; mClass;

    公共TabListener（活动活动，字符串变量，类＆LT; T＆GT; CLZ）{
        mActivity =活动;
        MTAG =标签;
        mClass = CLZ;
    }

    公共无效onTabSelected（TAB键，FragmentTransaction英尺）{
        如果（mFragment == NULL）{
            mFragment = Fragment.instantiate（mActivity，mClass.getName（））;
            ft.add（android.R.id.content，mFragment，MTAG）;
        } 其他 {
            ft.attach（mFragment）;
        }
    }

    公共无效onTabUnselected（TAB键，FragmentTransaction英尺）{
        如果（mFragment！= NULL）{
            ft.detach（mFragment）;
        }
    }

    公共无效onTabReselected（TAB键，FragmentTransaction英尺）{
    }
}
 

下面是我的进口，因为我想确保我用的是支持库：

 进口android.app.ActionBar;
进口android.app.ActionBar.Tab;
进口android.app.Activity;
进口android.os.Bundle;
进口android.support.v4.app.Fragment;
进口android.support.v4.app.FragmentActivity;
进口android.support.v4.app.FragmentTransaction;
进口android.support.v4.view.ViewPager;
进口android.view.Menu;
 

然而，Eclipse的是给我用的 TabListener 方法的问题。它告诉我如下：类型LayoutContainer.TabListener必须实现继承的抽象方法ActionBar.TabListener.onTabSelected（ActionBar.Tab，FragmentTransaction）

当我选择添加未实现的方法的Eclipse基本上添加的 OnTabSelected OnTabReselected 和 OnTabUnselected 的方法，但是这一次，路过不支持版本该片段（ android..app.Fragment ）作为参数。

在如何通过支持库再拍实施横向导航，以确保兼容性任何想法？

解决方案

 动作条= getActionBar（）;
actionBar.setNavigationMode（ActionBar.NAVIGATION_MODE_TABS）;

actionBar.setDisplayShowHomeEnabled（假）;
actionBar.setDisplayShowTitleEnabled（假）;

塔巴= actionBar.newTab（）的setText（）。
塔布= actionBar.newTab（）的setText（）。

碎片碎裂=新AFragmentTab（）;
片段fragmentB =新BFragmentTab（）;

tabA.setTabListener（新MyTabsListener（碎裂））;
tabB.setTabListener（新MyTabsListener（fragmentB））;

actionBar.addTab（塔巴）;
actionBar.addTab（塔布）;
 

该选项卡监听器如下：

 保护类MyTabsListener实现ActionBar.TabListener {
    私人片段片段;

    公共MyTabsListener（片段片段）{
        this.fragment =片段;
    }
    公共无效onTabSelected（TAB键，FragmentTransaction英尺）{
        ft.add（R.id.layout2，片段，NULL）;
    }
    公共无效onTabReselected（TAB键，FragmentTransaction英尺）{
    }
    公共无效onTabUnselected（TAB键，FragmentTransaction英尺）{
        ft.remove（片段）;
    }
}
 

，然后你让一个类为每个标签：

 公共类BFragmentTab扩展片段{

    @覆盖
    公共查看onCreateView（LayoutInflater充气，容器的ViewGroup，捆绑savedInstanceState）
    {
        返回inflater.inflate（R.layout.login，集装箱，假）;
    }
}
 

但请不支持的操作栏下方的Andr​​oid 3.0版本的头脑。如果你想使用它在旧版本我建议你使用actionBarSherlock库。

I am trying to implement Tab Navigation, but I want to make sure people that have older versions of Android can still use my application.

The app in mind ATM is fairly simple, I just want to be able to understand how to implement the layout and then I'll add the missing bits.

Anyhow, I have a Container Activity that extends Fragment Activity (to ensure compatibility), and this Activity creates a TabView using an ActionBar (I believe my problem resides here). The app will try to create three tabs and add them to the ActionBar, and I want to make sure the user can scroll back and forth using lateral navigation.

Here is TabListener I am trying to implement:

public static class TabListener<T extends Fragment> implements ActionBar.TabListener {

    private Fragment mFragment;
    private final Activity mActivity;
    private final String mTag;
    private final Class<T> mClass;

    public TabListener(Activity activity, String tag, Class<T> clz) {
        mActivity = activity;
        mTag = tag;
        mClass = clz;
    }

    public void onTabSelected(Tab tab, FragmentTransaction ft) {
        if (mFragment == null) {
            mFragment = Fragment.instantiate(mActivity, mClass.getName());
            ft.add(android.R.id.content, mFragment, mTag);
        } else {
            ft.attach(mFragment);
        }
    }

    public void onTabUnselected(Tab tab, FragmentTransaction ft) {
        if (mFragment != null) {
            ft.detach(mFragment);
        }
    }

    public void onTabReselected(Tab tab, FragmentTransaction ft) {
    }
}

Here are my imports, because I wanted to make sure I was using the support library:

import android.app.ActionBar;
import android.app.ActionBar.Tab;
import android.app.Activity;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.view.ViewPager;
import android.view.Menu;

However, Eclipse is giving me issues with the TabListener methods. It is telling me the following: "The type LayoutContainer.TabListener must implement the inherited abstract method ActionBar.TabListener.onTabSelected(ActionBar.Tab, FragmentTransaction)"

When I select Add unimplemented methods Eclipse basically adds the OnTabSelected OnTabReselected and OnTabUnselected methods, but this time, passing the non-support version of the Fragment (android..app.Fragment) as a parameter.

Any ideas on how to make another implementation of lateral navigation through the support library to ensure compatibility?

解决方案

actionBar = getActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

actionBar.setDisplayShowHomeEnabled(false);
actionBar.setDisplayShowTitleEnabled(false);

tabA = actionBar.newTab().setText("");
tabB = actionBar.newTab().setText("");

Fragment fragmentA = new AFragmentTab();
Fragment fragmentB = new BFragmentTab();

tabA.setTabListener(new MyTabsListener(fragmentA));
tabB.setTabListener(new MyTabsListener(fragmentB));

actionBar.addTab(tabA);
actionBar.addTab(tabB);

The tab listener is as follows:

protected class MyTabsListener implements ActionBar.TabListener{
    private Fragment fragment;

    public MyTabsListener(Fragment fragment){
        this.fragment = fragment;
    }
    public void onTabSelected(Tab tab, FragmentTransaction ft){
        ft.add(R.id.layout2, fragment, null);
    }
    public void onTabReselected(Tab tab, FragmentTransaction ft) {
    }
    public void onTabUnselected(Tab tab, FragmentTransaction ft) {
        ft.remove(fragment);
    }
}

and then you make a class for each tab:

public class BFragmentTab extends Fragment {

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
    {
        return inflater.inflate(R.layout.login, container, false);
    }
}

But keep in mind that the action bar isn't supported for android versions below 3.0 . If you want to use it in older versions I suggest you use actionBarSherlock Library.

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