Android fragment里的LifecycleOwner 在activity里怎么对应

效果：

1、布局：使用LinearLayout布置标签；再使用FrameLayout来布置Fragment。

android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
android:layout_width="match_parent"
android:layout_height="36dp"
android:orientation="horizontal"
android:weightSum="3">
android:id="@+id/tab1_layout"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:background="@color/tab_down"
android:gravity="center">
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="选项卡一"
android:textColor="#ffffff"/>
android:layout_width="2dp"
android:layout_height="match_parent"
android:background="#ffffff"/>
android:id="@+id/tab2_layout"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:background="@color/tab"
android:gravity="center">
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="选项卡二"
android:textColor="#ffffff"/>
android:layout_width="2dp"
android:layout_height="match_parent"
android:background="#ffffff"/>
android:id="@+id/tab3_layout"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:background="@color/tab"
android:gravity="center">
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="选项卡"
android:textColor="#ffffff"/>
android:id="@+id/content_layout"
android:layout_width="match_parent"
android:layout_height="match_parent">
fragment_fragmentmanager.xml

1、方法replaceFragment()实现切换Fragment的功能：通过FragmentTransaction的replace方法来替换FrameLayout中的Fragment。

2、改变标签的背景色，来区分选中的Tab与其他Tab。

public class FragmentAndFManagerActivity extends FragmentActivity
implements View.OnClickListener {
private static final String LOG_TAG = FragmentAndFManagerActivity.class.getSimpleName();
// 三个选项卡
private LinearLayout tab1Layout, tab2Layout, tab3Layout;
// 默认选中第一个
private int index = 1;
// fragment管理类
private FragmentManager fragmentManager;
// 三个fragment
private Fragment tab1Fragment, tab2Fragment, tab3Fragment;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_fragmentmanager);
fragmentManager = getSupportFragmentManager();
init();
}
/**
* 初始化控件
*/
private void init(){
tab1Layout = (LinearLayout) findViewById(R.id.tab1_layout);
tab2Layout = (LinearLayout) findViewById(R.id.tab2_layout);
tab3Layout = (LinearLayout) findViewById(R.id.tab3_layout);
tab1Layout.setOnClickListener(this);
tab2Layout.setOnClickListener(this);
tab3Layout.setOnClickListener(this);
setDefaultFragment();
}
/**
* 设置默认显示的fragment
*/
private void setDefaultFragment(){
FragmentTransaction transaction = fragmentManager.beginTransaction();
tab1Fragment = new FragmentAndFManager_Fragment1();
transaction.replace(R.id.content_layout, tab1Fragment);
transaction.commit();
}
/**
* 切换fragment
* @param newFragment
*/
private void replaceFragment(Fragment newFragment){
FragmentTransaction transaction = fragmentManager.beginTransaction();
if(!newFragment.isAdded()) {
Log.d(LOG_TAG, "In replaceFragment -- replace");
transaction.replace(R.id.content_layout, newFragment);
transaction.commit();
}else{
Log.d(LOG_TAG, "In replaceFragment -- show");
transaction.show(newFragment);
}
}
/**
* 改变选项卡的选中状态
*/
private void clearStatus(){
if(index == 1){
tab1Layout.setBackgroundColor(getResources().getColor(R.color.tab));
}else if(index == 2){
tab2Layout.setBackgroundColor(getResources().getColor(R.color.tab));
}else if(index == 3){
tab3Layout.setBackgroundColor(getResources().getColor(R.color.tab));
}
}
@Override
public void onClick(View v) {
clearStatus();
switch(v.getId()){
case R.id.tab1_layout:
if(tab1Fragment == null){
tab1Fragment = new FragmentAndFManager_Fragment1();
}
replaceFragment(tab1Fragment);
tab1Layout.setBackgroundColor(getResources().getColor(R.color.tab_down));
index = 1;
break;
case R.id.tab2_layout:
if(tab2Fragment == null){
tab2Fragment = new FragmentAndFManager_Fragment2();
}
replaceFragment(tab2Fragment);
tab2Layout.setBackgroundColor(getResources().getColor(R.color.tab_down));
index = 2;
break;
case R.id.tab3_layout:
if(tab3Fragment == null){
tab3Fragment = new FragmentAndFManager_Fragment3();
}
replaceFragment(tab3Fragment);
tab3Layout.setBackgroundColor(getResources().getColor(R.color.tab_down));
index = 3;
break;
}
}
}

FragmentAndFManagerActivity.java

android Tab 类型切换界面