2012. 11. 9. 17:57
MainActivity.java
package com.example.hellotabfragment;
import java.util.HashMap;
import android.content.Context;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentTransaction;
import android.util.Log;
import android.view.View;
import android.widget.TabHost;
import com.example.hellotabfragment.fragment.Fragment1;
import com.example.hellotabfragment.fragment.Fragment2;
import com.example.hellotabfragment.fragment.Fragment3;
/**
* This demonstrates how you can implement switching between the tabs of a
* TabHost through fragments. It uses a trick (see the code below) to allow
* the tabs to switch between fragments instead of simple views.
*/
public class MainActivity extends FragmentActivity {
TabHost mTabHost;
TabManager mTabManager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mTabHost = (TabHost)findViewById(android.R.id.tabhost);//Container for a tabbed window view.
mTabHost.setup();
mTabManager = new TabManager(this, mTabHost, R.id.realtabcontent);// tab host와 탭을 눌렀을때 바뀌어야하는 부분의 id
mTabManager.addTab(mTabHost.newTabSpec("simple").setIndicator("Simple"), Fragment1.class, null); //새로운 탭을 만든다.
//tabspec -> A tab has a tab indicator, content, and a tag that is used to keep track of it
mTabManager.addTab(mTabHost.newTabSpec("contacts").setIndicator("Contacts"), Fragment2.class, null);
mTabManager.addTab(mTabHost.newTabSpec("custom").setIndicator("Custom"), Fragment3.class, null);
if (savedInstanceState != null) {
mTabHost.setCurrentTabByTag(savedInstanceState.getString("tab")); // 방향 전환 전에 선택된 탭이 있다면 가져와서 설정
}
}
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putString("tab", mTabHost.getCurrentTabTag()); // 방향 전환될때 넣어준다.
Log.e("tab", mTabHost.getCurrentTabTag());
}
/**
* This is a helper class that implements a generic mechanism for
* associating fragments with the tabs in a tab host. It relies on a
* trick. Normally a tab host has a simple API for supplying a View or
* Intent that each tab will show. This is not sufficient for switching
* between fragments. So instead we make the content part of the tab host
* 0dp high (it is not shown) and the TabManager supplies its own dummy
* view to show as the tab content. It listens to changes in tabs, and takes
* care of switch to the correct fragment shown in a separate content area
* whenever the selected tab changes.
*/
public static class TabManager implements TabHost.OnTabChangeListener {
private final FragmentActivity mActivity; //context
private final TabHost mTabHost;
private final int mContainerId;
private final HashMap mTabs = new HashMap(); // tag기준으로 tab에대한 정보가 들어있다.
TabInfo mLastTab;
static final class TabInfo {
private final String tag;
private final Class clss;
private final Bundle args;
private Fragment fragment;
TabInfo(String _tag, Class _class, Bundle _args) {
tag = _tag;
clss = _class;
args = _args;
}
}
static class DummyTabFactory implements TabHost.TabContentFactory{ // Makes the content of a tab when it is selected.
// 굳이 필요 없어 보이는 듯
private final Context mContext;
public DummyTabFactory(Context context) {
mContext = context;
}
@Override
public View createTabContent(String tag) {
View v = new View(mContext);
v.setMinimumWidth(0);
v.setMinimumHeight(0);
return v;
}
}
public TabManager(FragmentActivity activity, TabHost tabHost, int containerId) {
mActivity = activity;
mTabHost = tabHost;
mContainerId = containerId;
mTabHost.setOnTabChangedListener(this);
}
public void addTab(TabHost.TabSpec tabSpec, Class clss, Bundle args) { // tab추가하기
tabSpec.setContent(new DummyTabFactory(mActivity));
String tag = tabSpec.getTag();
TabInfo info = new TabInfo(tag, clss, args); // 그닥 필요없어 보이긴함
// Check to see if we already have a fragment for this tab, probably
// from a previously saved state. If so, deactivate it, because our
// initial state is that a tab isn't shown.
info.fragment = mActivity.getSupportFragmentManager().findFragmentByTag(tag); //tag로 프래그먼트 찾아서 넣어준다.
if (info.fragment != null && !info.fragment.isDetached()) { //frament가 null이아니고 떨어져있지 않으면 떼준다.
FragmentTransaction ft = mActivity.getSupportFragmentManager().beginTransaction();
ft.detach(info.fragment);
ft.commit();
}
mTabs.put(tag, info); //자료형에 넣어준다. 이것도 불필요함
mTabHost.addTab(tabSpec); // 탭호스트에 실제로 탭을 넣어준다.
}
@Override
public void onTabChanged(String tabId) {
TabInfo newTab = mTabs.get(tabId); // 넣어놨던 tabinfo찾아온다.
if (mLastTab != newTab) {//라스트탭이 뉴탭과 같지 않다면
FragmentTransaction ft = mActivity.getSupportFragmentManager().beginTransaction();
if (mLastTab != null) { //라스트탭이 널이 아니면
if (mLastTab.fragment != null) { //라스트탭의 프래그먼트가 널이 아니면
ft.detach(mLastTab.fragment); //떼어낸다
}
}
if (newTab != null) { // 뉴탭이 널이 아니면
if (newTab.fragment == null) { //프래그먼트가 널이면
newTab.fragment = Fragment.instantiate(mActivity,
newTab.clss.getName(), newTab.args);//새로 만들어준다
ft.add(mContainerId, newTab.fragment, newTab.tag); //추가해준다
} else {
ft.attach(newTab.fragment); //널이 아니면 그대로 붙여준다.
}
}
mLastTab = newTab; //새로운탭이 라스트탭이 된다.
ft.commit();
mActivity.getSupportFragmentManager().executePendingTransactions();
}
}
}
}
activity_main.xml
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