1.生命周期
启动Fragment时：
onAttach
onCreate
onCreateView
onViewCreated
onActivityCreated
onStart
onResume
启动后点击home键：
onPause
onSaveInstanceState
onStop
从home键再次进入:
onStart
onResume
Fragment1-->Fragment2:
fragment1: onPause onStop onDestroyView
fragment2:
onAttach
onCreate
onCreateView
onViewCreated
onActivityCreated
onStart
onResume
在回退Fragment2-->Fragment1:
fragment1：onCreateView onActivityCreated onStart onResume
点击back键退出：
onPause
onStop
onDestroyView
onDestroy
onDetach
如果启动2个Fragment后，点击back退出：
两个Fragment交替调用 onPause,onStop。然后一一调用onDestoryView，onDestory,onDetach.
2.Fragent底部导航的使用<忘了看的谁的博客源码了……>
<1>结构图：
<2> A-E fragment
public class Tab_AFragment extends Fragment {
private static final String TAG = "Tab_AFragment";
public Tab_AFragment() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
Log.d(TAG, "onCreateView");
return inflater.inflate(R.layout.fragment_tab, container, false);
}
}
Main.xml 布局
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:id="@+id/activity_main"
android:layout_width="match_parent" android:layout_height="match_parent"
android:orientation="vertical"
android:background="#ffffff"
tools:context="myapplication.com.myfragment.MainActivity"> <LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
> <FrameLayout
android:id="@+id/tab_content"
android:layout_width="fill_parent"
android:layout_height="0dp"
android:layout_weight="1.0"
android:background="#77557799"
/> <RadioGroup
android:id="@+id/tabs_rg"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:gravity="center" >
<RadioButton
android:id="@+id/tab_rb_a"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:drawableTop="@drawable/tablatestalert"
android:button="@null"
android:text="Tab1"
android:textColor="#000000"
android:textSize="13sp"
android:layout_weight="1.0"
android:gravity="center"
android:singleLine="true"
android:checked="true"
android:background="@drawable/selector_tab"
/>
<RadioButton
android:id="@+id/tab_rb_b"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:drawableTop="@drawable/tabsearch"
android:button="@null"
android:text="Tab2"
android:textColor="#000000"
android:textSize="13sp"
android:layout_weight="1.0"
android:gravity="center"
android:singleLine="true"
android:background="@drawable/selector_tab"
/> <RadioButton
android:id="@+id/tab_rb_c"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:drawableTop="@drawable/tabrecommd"
android:button="@null"
android:text="Tab3"
android:textColor="#000000"
android:textSize="13sp"
android:layout_weight="1.0"
android:gravity="center"
android:singleLine="true"
android:background="@drawable/selector_tab"
/> <RadioButton
android:id="@+id/tab_rb_d"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:drawableTop="@drawable/tabconfigicon"
android:button="@null"
android:text="Tab4"
android:textColor="#000000"
android:textSize="13sp"
android:layout_weight="1.0"
android:gravity="center"
android:singleLine="true"
android:background="@drawable/selector_tab"
/>
<RadioButton
android:id="@+id/tab_rb_e"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:drawableTop="@drawable/tababoutus"
android:button="@null"
android:text="Tab5"
android:textColor="#000000"
android:textSize="13sp"
android:layout_weight="1.0"
android:gravity="center"
android:singleLine="true"
android:background="@drawable/selector_tab"
/> </RadioGroup>
</LinearLayout>
</LinearLayout>
选择：
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<!-- 默认时的图片 -->
<item android:drawable="@android:color/transparent" android:state_checked="false"/>
<!-- 选择时的图片 -->
<item android:drawable="@color/tab_selected_bg" android:state_checked="true"/>
</selector>
MainActivity
public class MainActivity extends AppCompatActivity {
private RadioGroup rgs;
public List<Fragment> fragments = new ArrayList<Fragment>();
public String hello = "hello ";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
fragments.add(new Tab_AFragment());
fragments.add(new Tab_BFragment());
fragments.add(new Tab_CFragment());
fragments.add(new Tab_DFragment());
fragments.add(new Tab_EFragment());
rgs = (RadioGroup) findViewById(R.id.tabs_rg);
FragmentTabAdapter tabAdapter = new FragmentTabAdapter(this, fragments, R.id.tab_content, rgs);
tabAdapter.setOnRgsExtraCheckedChangedListener(new FragmentTabAdapter.OnRgsExtraCheckedChangedListener(){
@Override
public void OnRgsExtraCheckedChanged(RadioGroup radioGroup, int checkedId, int index) {
System.out.println("Extra---- " + index + " checked!!! ");
}
});
}
}
FragmentTabAdapter
public class FragmentTabAdapter implements RadioGroup.OnCheckedChangeListener{
/**
* tab对应的fragments
*/
private List<Fragment> fragments;
/**
* 单选按钮组，用于切换tab
*/
private RadioGroup rgs;
/**
* fragment 所属的activity
*/
private FragmentActivity fragmentActivity;
/**
* activity 中展示fragment的区域id
*/
private int fragmentContentId;
/**
* 当前tab页面的索引
*/
private int currentTab;
/**
* 用于让调用者在切换tab时候增加新的功能
*/
private OnRgsExtraCheckedChangedListener onRgsExtraCheckedChangedListener;
public FragmentTabAdapter(FragmentActivity fragmentActivity, List<Fragment> fragments, int fragmentContentId, RadioGroup rgs) {
this.fragments = fragments;
this.rgs = rgs;
this.fragmentActivity = fragmentActivity;
this.fragmentContentId = fragmentContentId;
// 默认显示第一页
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(); // 暂停当前tab
// getCurrentFragment().onStop(); // 暂停当前tab
if(fragment.isAdded()){
// fragment.onStart(); // 启动目标tab的onStart()
fragment.onResume(); // 启动目标tab的onResume()
}else{
ft.add(fragmentContentId, fragment);
}
showTab(i); // 显示目标tab
ft.commit();
// 如果设置了切换tab额外功能功能接口
if(null != onRgsExtraCheckedChangedListener){
onRgsExtraCheckedChangedListener.OnRgsExtraCheckedChanged(radioGroup, checkedId, i);
}
}
}
}
/**
* 切换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; // 更新目标tab为当前tab
}
/**
* 获取一个带动画的FragmentTransaction
* @param index
* @return
*/
private FragmentTransaction obtainFragmentTransaction(int index){
FragmentTransaction ft = fragmentActivity.getSupportFragmentManager().beginTransaction();
// 设置切换动画
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;
}
/**
* 切换tab额外功能功能接口
*/
static class OnRgsExtraCheckedChangedListener{
public void OnRgsExtraCheckedChanged(RadioGroup radioGroup, int checkedId, int index){
}
}
}
<3>效果图
<4>code:
http://pan.baidu.com/s/1gf3KKSz