普通的FragmentTabhost 的使用, 但這種用法, 每次當切換到Fragment的時候,都會重新調用onCreatView, 有的時候是不需要的, 請看下面的方法,就不會每次被調用。
先來 Layout:
<?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"
android:orientation="vertical">
<FrameLayout
android:id="@+id/main_aty_fragmentactivity"
android:layout_width="match_parent"
android:layout_height="0dip"
android:layout_weight="1" />
<View
android:layout_width="match_parent"
android:layout_height="0.5dp"
android:background="@color/view_color" />
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="55dp">
<RadioGroup
android:id="@+id/main_aty_tab_rg_menu"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/white"
android:orientation="horizontal"
android:paddingTop="5dp">
<RadioButton
android:id="@+id/tab_rb_index"
style="@style/tab_rb_style"
android:checked="true"
android:drawableTop="@drawable/main_aty_index_ico"
android:text="首頁" />
<RadioButton
android:id="@+id/tab_rb_active"
style="@style/tab_rb_style"
android:drawableTop="@drawable/main_aty_active_ico"
android:text="活動" />
<RadioButton
android:id="@+id/tab_rb_order"
style="@style/tab_rb_style"
android:drawableTop="@drawable/main_aty_order_ico"
android:text="我的" />
</RadioGroup>
</RelativeLayout>
<!--<android.support.v4.app.FragmentTabHost-->
<!--android:id="@+id/main_aty_tabHost"-->
<!--android:layout_width="fill_parent"-->
<!--android:layout_height="50dp"-->
<!--android:visibility="gone" >-->
<!--<FrameLayout-->
<!--android:id="@+id/tabcontent"-->
<!--android:layout_width="0dp"-->
<!--android:layout_height="0dp"-->
<!--android:layout_weight="0" />-->
<!--</android.support.v4.app.FragmentTabHost>-->
</LinearLayout>
再看 TabActivity 中的
private void initViewHost() {
layoutInflater = LayoutInflater.from(this);
mTabRg = (RadioGroup) findViewById(R.id.main_aty_tab_rg_menu);
fragmentArray.add(new FragmentIndex());
fragmentArray.add(new FragmentActive());
fragmentArray.add(new FragmentCenter());
FragmentTabAdapter tabAdapter = new FragmentTabAdapter(this, fragmentArray, R.id.main_aty_fragmentactivity, mTabRg);
tabAdapter.setOnRgsExtraCheckedChangedListener(new FragmentTabAdapter.OnRgsExtraCheckedChangedListener() {
@Override
public void OnRgsExtraCheckedChanged(RadioGroup radioGroup, int checkedId, int index) {
//todo
}
});
message_red_tips = (ImageView) findViewById(R.id.message_red_tips);
}
最關鍵的部分是這裏 FragmentTabAdapter, 附上代碼:
package com.hanzi.chinaexpress.view;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentTransaction;
import android.widget.RadioGroup;
import java.util.List;
public class FragmentTabAdapter implements RadioGroup.OnCheckedChangeListener {
private List<Fragment> fragments; // 一個tab頁面對應一個Fragment
private RadioGroup rgs; // 用於切換tab
private FragmentActivity fragmentActivity; // Fragment所屬的Activity
private int fragmentContentId; // Activity中所要被替換的區域的id
private int currentTab; // 當前Tab頁面索引
private OnRgsExtraCheckedChangedListener onRgsExtraCheckedChangedListener; // 用於讓調用者在切換tab時候增加新的功能
public FragmentTabAdapter(FragmentActivity fragmentActivity, List<Fragment> fragments, int fragmentContentId, RadioGroup rgs) {
this.fragments = fragments;
this.rgs = rgs;
this.fragmentActivity = fragmentActivity;
this.fragmentContentId = fragmentContentId;
// 默認顯示第一頁
FragmentTransaction ft = fragmentActivity.getSupportFragmentManager().beginTransaction();
ft.add(fragmentContentId, fragments.get(0));
ft.commit();
rgs.setOnCheckedChangeListener(this);
}
@Override
public void onCheckedChanged(RadioGroup radioGroup, int checkedId) {
for (int i = 0; i < rgs.getChildCount(); i++) {
if (rgs.getChildAt(i).getId() == checkedId) {
Fragment fragment = fragments.get(i);
FragmentTransaction ft = obtainFragmentTransaction(i);
getCurrentFragment().onPause(); // 暫停當前tab
// getCurrentFragment().onStop(); // 暫停當前tab
if (fragment.isAdded()) {
// fragment.onStart(); // 啓動目標tab的onStart()
fragment.onResume(); // 啓動目標tab的onResume()
} else {
ft.add(fragmentContentId, fragment);
}
showTab(i); // 顯示目標tab
ft.commit();
// 如果設置了切換tab額外功能功能接口
if (null != onRgsExtraCheckedChangedListener) {
onRgsExtraCheckedChangedListener.OnRgsExtraCheckedChanged(radioGroup, checkedId, i);
}
}
}
}
/**
* 切換tab
*
* @param idx
*/
private void showTab(int idx) {
for (int i = 0; i < fragments.size(); i++) {
Fragment fragment = fragments.get(i);
FragmentTransaction ft = obtainFragmentTransaction(idx);
if (idx == i) {
ft.show(fragment);
} else {
ft.hide(fragment);
}
ft.commit();
}
currentTab = idx; // 更新目標tab爲當前tab
}
/**
* 獲取一個帶動畫的FragmentTransaction
*
* @param index
* @return
*/
private FragmentTransaction obtainFragmentTransaction(int index) {
FragmentTransaction ft = fragmentActivity.getSupportFragmentManager().beginTransaction();
// 設置切換動畫
// if (index > currentTab) {
// ft.setCustomAnimations(R.anim.slide_left_in, R.anim.slide_left_out);
// } else {
// ft.setCustomAnimations(R.anim.slide_right_in, R.anim.slide_right_out);
// }
return ft;
}
public int getCurrentTab() {
return currentTab;
}
public Fragment getCurrentFragment() {
return fragments.get(currentTab);
}
public OnRgsExtraCheckedChangedListener getOnRgsExtraCheckedChangedListener() {
return onRgsExtraCheckedChangedListener;
}
public void setOnRgsExtraCheckedChangedListener(OnRgsExtraCheckedChangedListener onRgsExtraCheckedChangedListener) {
this.onRgsExtraCheckedChangedListener = onRgsExtraCheckedChangedListener;
}
/**
* 切換tab額外功能功能接口
*/
static class OnRgsExtraCheckedChangedListener {
public void OnRgsExtraCheckedChanged(RadioGroup radioGroup, int checkedId, int index) {
}
}
}
另外附上普通的 FragmentTabhost的使用: