ActionBar和Fragments的新手，但一般熟悉Android。
我一直在学习一些教程。到目前为止，我有以下内容：
Fragments（每个都有覆盖onCreateView（）并加载一个简单的视图）TabListener（我相信问题就在那里，请参阅帖子底部的代码）Activity，其中全部执行活动代码：
public class Activity_Home extends Activity
{
ActionBar actionBar;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
actionBar = getActionBar(); // Get reference to ActionBar
// Add some navigation tabs...
// 1. Enable ActionBar navigation tabs
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
actionBar.setDisplayShowTitleEnabled(false);
// 2. Add the tabs
Tab programTab = actionBar.newTab();
Tab settingsTab = actionBar.newTab();
Tab historyTab = actionBar.newTab();
programTab.setText("Program")
.setTabListener(new TabListener<Fragment_Program>(
this, R.id.fragmentParent, Fragment_Program.class));
settingsTab.setText("Settings")
.setTabListener(new TabListener<Fragment_Settings>(
this, R.id.fragmentParent, Fragment_Settings.class));
historyTab.setText("History")
.setTabListener(new TabListener<Fragment_History>(
this, R.id.fragmentParent, Fragment_History.class));
actionBar.addTab(programTab);
actionBar.addTab(settingsTab);
actionBar.addTab(historyTab);
}
}
我的碎片：
public class Fragment_Program extends Fragment
{
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState)
{
return inflater.inflate(R.layout.fragment_program, null);
}
}
...
public class Fragment_History extends Fragment
{
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState)
{
return inflater.inflate(R.layout.fragment_history, null);
}
}
...
public class Fragment_Settings extends Fragment
{
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState)
{
return inflater.inflate(R.layout.fragment_settings, null);
}
}
最后，我的TabListener几乎基于官方的Google示例。 fragmentContainer（int）是Activities布局中LinearLayout的XML资源ID，它是所有这些片段的直接父级。
public class TabListener <T extends Fragment> implements ActionBar.TabListener
{
private Fragment fragment;
private int fragmentContainer;
private final Activity activity;
private final Class<T> fragmentClass;
/** Constructor used each time a new tab is created.
* @param activity The host Activity, used to instantiate the fragment
* @param tag The identifier tag for the fragment
* @param fragmentClass The fragment's Class, used to instantiate the fragment
*/
public TabListener(Activity activity, int fragmentContainer, Class<T> fragmentClass)
{
this.activity = activity;
this.fragmentContainer = fragmentContainer;
this.fragmentClass = fragmentClass;
}
@Override
public void onTabReselected(Tab arg0, FragmentTransaction arg1)
{
// User selected the already selected tab. Usually do nothing.
}
@Override
public void onTabSelected(Tab tab, FragmentTransaction ft)
{
// Check if the fragment is already intialized
if (fragment == null)
{
// If not, instatiate and add it to the Activity
fragment = Fragment.instantiate(activity, fragmentClass.getName());
ft.add(fragmentContainer, fragment);
}
else
{
ft.attach(fragment);
}
}
@Override
public void onTabUnselected(Tab tab, FragmentTransaction ft)
{
if (fragment != null)
{
// Detach the fragment, because another one is being attached
ft.detach(fragment);
}
}
}
所以应用程序加载，选项卡在那里，我可以选择它们，但它们似乎没有彼此链接，我不确定如何继续。
任何建议都会很棒！
干杯
奖金问题：ActionBar也低于现有的ActionBar ..目标是替换它，而不是在另一个下面..再次任何建议都会很棒！
答案 0 :(得分：1)
我想您希望以可以在标签之间滑动的方式连接标签，为了实现这一点，您应该考虑使用ViewPager。
顺便说一下，这是XML：
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_height="fill_parent"
android:layout_width="fill_parent"
android:orientation="vertical">
<android.support.v4.view.ViewPager
android:id="@+id/pager"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"/>
</LinearLayout>
以下是您可以使用的示例代码：
public class MyTabActivity extends FragmentActivity implements ActionBar.TabListener, ViewPager.OnPageChangeListener {
//What item on the pager is being displayed
private int mCurPagerItem = 0;
//This will be set to the pageer to handle navigation
private SectionsPagerAdapter mSectionsPagerAdapter;
private ViewPager mViewPager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
final ActionBar mActionBar = getActionBar();
mActionBar.setDisplayShowHomeEnabled(false);
mActionBar.setDisplayShowTitleEnabled(false);
mActionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
//add the tabs
mActionBar.addTab(mActionBar.newTab().setIcon(R.drawable.your_icon).setTabListener(this));
mActionBar.addTab(mActionBar.newTab().setIcon(R.drawable.your_icon2).setTabListener(this));
mActionBar.addTab(mActionBar.newTab().setIcon(R.drawable.your_icon3).setTabListener(this));
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setAdapter(mSectionsPagerAdapter);
mViewPager.setOnPageChangeListener(this);
}
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
switch (position) {
case 0:
Fragment one = new Fragment_Program();
return one ;
case 1:
Fragment two = new Fragment_Settings();
return two ;
case 2:
Fragment three = new Fragment_History();
return three ;
default:
break;
}
return null;
}
@Override
public int getCount() {
return 3;
}
@Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 0:
return getString(R.string.title_one);
case 1:
return getString(R.string.title_two);
case 2:
return getString(R.string.title_three);
}
return null;
}
}
@Override
public void onPageScrollStateChanged(int arg0) {}
@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {}
@Override
public void onPageSelected(int arg0) {
//When a Page is selected, make that the current navigation item
getActionBar().setSelectedNavigationItem(arg0);
}
@Override
public void onTabReselected(Tab tab, FragmentTransaction ft) {
//Back to top maybe?
}
@Override
public void onTabSelected(Tab tab, FragmentTransaction ft) {
//get the position
final int pos = tab.getPosition();
//Tell the viewpager to scroll to that page
mViewPager.setCurrentItem(pos);
mCurPagerItem = pos;
}
@Override
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
}
要回答您的红利问题，请在您的清单上尝试使用指定的活动代码添加以下行：
android:uiOptions="splitActionBarWhenNarrow"
答案 1 :(得分：1)
修正了它！
我改变了我的方法，使用Fragment Container ID（对我来说确实有用并且对我来说更有意义..），根据此示例Good complete Fragment and ActionBar example和Google官方示例使用String标记。