Android编程之ActionBar Tabs用法实例分析

本文实例讲述了android编程之actionbar tabs用法。分享给大家供大家参考，具体如下：

这里主要实现用tab切换不同的fragment，点击view显示or隐藏actionbar，把actionbar 设为透明，使界面更加友好，详细代码见资源里的actionbartabs。

actionbar tab主要用于fragment之间的切换，其必须要设置actionbar.tablistener，详细代码如下

actionbaractivity.java：

import android.app.actionbar;
import android.app.activity;
import android.app.fragmenttransaction;
import android.app.actionbar.tab;
import android.os.bundle;
import android.os.countdowntimer;
import android.view.motionevent;
import android.view.window;
public class actionbaractivity extends activity {
  /** called when the activity is first created. */
  @override
  public void oncreate(bundle savedinstancestate) {
    super.oncreate(savedinstancestate);
    //使actionbar变得透明
    requestwindowfeature(window.feature_action_bar_overlay);
    setcontentview(r.layout.main);
    final actionbar actionbar = getactionbar();
    actionbar.setnavigationmode(actionbar.navigation_mode_tabs);
    // remove the activity title to make space for tabs
    actionbar.setdisplayshowtitleenabled(false);
    afragment afragment = new afragment();
    actionbar.addtab(actionbar.newtab().settext("tab-a")
        .settablistener(new listenera(afragment)));
    bfragment bfragment = new bfragment();
    actionbar.addtab(actionbar.newtab().settext("tab-b")
        .settablistener(new listenerb(bfragment)));
  }
  //点击显示or隐藏actionbar
  public boolean ontouchevent(motionevent event){
    actionbar bar = getactionbar();
    switch(event.getaction()){
      case motionevent.action_up:
        if(bar.isshowing()) bar.hide();
        else bar.show();
        break;
      default:
          break;
    }
    return true;
  }
  private class listenera implements actionbar.tablistener {
    private afragment mfragment;
    // called to create an instance of the listener when adding a new tab
    public listenera(afragment fragment) {
      mfragment = fragment;
    }
    public void ontabselected(tab tab, fragmenttransaction ft) {
      ft.add(r.id.fragment, mfragment, null);
    }
    public void ontabunselected(tab tab, fragmenttransaction ft) {
      ft.remove(mfragment);
    }
    public void ontabreselected(tab tab, fragmenttransaction ft) {
      // do nothing }
    }
  }
  private class listenerb implements actionbar.tablistener {
    private bfragment mfragment;
    // called to create an instance of the listener when adding a new tab
    public listenerb(bfragment fragment) {
      mfragment = fragment;
    }
    public void ontabselected(tab tab, fragmenttransaction ft) {
      ft.add(r.id.fragment, mfragment, null);
    }
    public void ontabunselected(tab tab, fragmenttransaction ft) {
      ft.remove(mfragment);
    }
    public void ontabreselected(tab tab, fragmenttransaction ft) {
      // do nothing }
    }
  }
}

其中涉及到两个fragment，在前面fragment的笔记中讲过，这里就不再赘述。类afragment实现如下，bfragment实现与这类似：

public class afragment extends fragment {
  public view oncreateview(layoutinflater inflater, viewgroup container,
      bundle savedinstancestate) {
    return inflater.inflate(r.layout.alayout, container, false);
    }
}

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希望本文所述对大家android程序设计有所帮助。