我不确定我是否遗漏了任何基础知识。我有一个托管Action Bar标签的活动: 所以这是结构 MainActivity - >有两个ActionBar标签F1和F2 || Frag.java是容纳xml的容器片段,用于定义要替换的FrameLayout || F1是Frag1.java,其中Frag1.java显然是我们古老的片段 || F2是Frag2.java,其中Frag2.java是另一个片段 在我的MainActivity中,我创建了两个选项卡, * 注意: *两者都有相同的片段,这些片段是Frag.java,然后在Frag.java onCreateView中我尝试添加片段。这不会发生什么问题。
(理想情况下,我希望标签下的片段被按钮点击事件上的另一个片段替换)
这是我的主要活动
MainActivity.java
public class MainActivity extends SherlockFragmentActivity {
@Override
protected void onCreate(Bundle arg0) {
super.onCreate(arg0);
setContentView(R.layout.activity_main);
ActionBar actionBar = getSupportActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
ActionBar.Tab FragTab1 = actionBar.newTab().setText("F1");
ActionBar.Tab FragTab2 = actionBar.newTab().setText("F2");
Fragment fragment1 = new Frag();
Fragment fragment2 = new Frag2();
FragTab1.setTabListener(new MyTabListener(fragment1));
FragTab2.setTabListener(new MyTabListener(fragment2));
actionBar.addTab(FragTab1,0,true);
actionBar.addTab(FragTab2,1,false);
}
class MyTabListener implements ActionBar.TabListener
{
Fragment fragment;
public MyTabListener(Fragment fragment)
{
this.fragment=fragment;
}
@Override
public void onTabSelected(Tab tab, FragmentTransaction ft) {}
@Override
public void onTabUnselected(Tab tab, FragmentTransaction ft) { }
@Override
public void onTabReselected(Tab tab, FragmentTransaction ft) {}}}
来到我的简单片段我有三个设置Frag,Frag1,frag2
下面的是frag.java
public class Frag extends SherlockFragment {
public Frag() {
// TODO Auto-generated constructor stub
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.parent, container,false);
FragmentManager fm = getFragmentManager();
FragmentTransaction ft= fm.beginTransaction();
Frag1 f1 = new Frag1();
ft.add(R.id.contentFragment, f1);
ft.commit();
return v;
}
}
下面的是我的parent.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<FrameLayout
android:id="@+id/contentFragment"
android:layout_width="wrap_content"
android:layout_height="match_parent" >
</FrameLayout>
</LinearLayout>
下面的是frag2.java
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
View v = inflater.inflate(R.layout.frag1, container, false);
Button btn = (Button)v.findViewById(R.id.button1);
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Frag2 fragment = new Frag2();
FragmentManager fm = getFragmentManager();
FragmentTransaction transaction = fm.beginTransaction();
transaction.replace(R.id.contentFragment, fragment);
transaction.commit();
}
});
return v;
}
并在上面的片段中,您看到按钮单击应该替换片段,但我甚至无法获得此片段。
自从三天以来,我一直在玩弄这个。我真的很感激这里的任何帮助或建议,如果有人能指导我出错的地方,那将是非常棒的!答案 0 :(得分:1)
将您的MainActivity更改为
public class MainActivity extends SherlockFragmentActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ActionBar actionBar = getSupportActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
ActionBar.Tab FragTab1 = actionBar.newTab().setText("F1");
ActionBar.Tab FragTab2 = actionBar.newTab().setText("F2");
FragTab1.setTabListener(new TabListener<MyFragmentA>(this, "F1",
Frag.class));
FragTab1.setTabListener(new TabListener<MyFragmentB>(this, "F2",
Frag2.class));
actionBar.addTab(FragTab1, 0, true);
actionBar.addTab(FragTab2, 1, false);
if (savedInstanceState != null) {
int savedIndex = savedInstanceState.getInt("SAVED_INDEX");
getSupportActionBar().setSelectedNavigationItem(savedIndex);
}
}
public static class TabListener<T extends Fragment> implements
ActionBar.TabListener {
Fragment fragment;
private final Activity myActivity;
private final String myTag;
private final Class<T> myClass;
public TabListener(Activity activity, String tag, Class<T> cls) {
myActivity = activity;
myTag = tag;
myClass = cls;
}
@Override
public void onTabSelected(Tab tab, FragmentTransaction ft) {
Fragment myFragment = myActivity.getFragmentManager()
.findFragmentByTag(myTag);
// Check if the fragment is already initialized
if (myFragment == null) {
// If not, instantiate and add it to the activity
myFragment = Fragment
.instantiate(myActivity, myClass.getName());
ft.add(android.R.id.content, myFragment, myTag);
} else {
// If it exists, simply attach it in order to show it
ft.attach(myFragment);
}
}
@Override
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
Fragment myFragment = myActivity.getFragmentManager()
.findFragmentByTag(myTag);
if (myFragment != null) {
// Detach the fragment, because another one is being attached
ft.detach(myFragment);
}
}
@Override
public void onTabReselected(Tab tab, FragmentTransaction ft) {
// TODO Auto-generated method stub
}
}
}
单击选项卡时,片段会附加,当您选择另一个选项卡时,请分离当前片段并附加另一个片段。
不确定您在Frag
和Frag2
View v = inflater.inflate(R.layout.parent, container,false);
您在parent.xml
中正在充气Frag
。我相信这不是你想要的。相反,每个片段都有xml布局,并为其扩展布局。