回退栈、ListFragment、TabHost

回退栈ListFragmentTabHost

回退栈

//事务在提交fragment对象的同时把fragment添加到 回退栈中

FragmentTransaction transaction = manager.beginTransaction(); transaction.add(R.id.real1,r1); transaction.addToBackStack(""); transaction.add(R.id.real1,list); transaction.commit(); FragmentTransaction transaction1 = manager.beginTransaction(); transaction1.add(R.id.real2,listfragment); transaction1.commit(); int backStackEntryCount = manager.getBackStackEntryCount();//栈内当前的容量 Log.e("###","当前容量"); manager.popBackStack(); int backStackEntryCount1 = manager.getBackStackEntryCount();//栈内移除后的容量 Log.e("###","移除后的容量");

ListFragment

//自定义一个类去继承ListFragment public class listfragment extends ListFragment { List<String> list; List<String> list2; @Override public void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); EventBus.getDefault().register(this); list=new ArrayList<>(); list.add("1"); list.add("2"); list.add("3"); setListAdapter(new ArrayAdapter<String>(getActivity(),android.R.layout.simple_list_item_1,list)); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { return super.onCreateView(inflater, container, savedInstanceState); } @Subscribe(threadMode = ThreadMode.MAIN,sticky = true) public void str(int a){ switch (a){ case 0:list2=new ArrayList<>(); list2.add("天津");list2.add("乌塘");list2.add("杭州"); setListAdapter(new ArrayAdapter<String>(getActivity(),android.R.layout.simple_list_item_1,list2)); break; case 1:list2=new ArrayList<>(); list2.add("天津");list2.add("乌塘");list2.add("杭州"); setListAdapter(new ArrayAdapter<String>(getActivity(),android.R.layout.simple_list_item_1,list2));break; case 2:list2=new ArrayList<>(); list2.add("天津");list2.add("乌塘");list2.add("杭州"); setListAdapter(new ArrayAdapter<String>(getActivity(),android.R.layout.simple_list_item_1,list2));break; } } @Override public void onDestroy() { super.onDestroy(); EventBus.getDefault().unregister(this); } }

TabHost

//xml文件布局

<TabHost xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".Main2Activity" android:id="@android:id/tabhost"> <LinearLayout android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <TabWidget android:layout_width="match_parent" android:layout_height="50dp" android:id="@android:id/tabs"> <FrameLayout android:layout_width="match_parent" android:layout_height="match_parent" android:id="@android:id/tabcontent"> </FrameLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="match_parent" android:id="@+id/layout01" android:orientation="vertical"> <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:text="第一个"/> </LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="match_parent" android:id="@+id/layout02" android:orientation="vertical"> <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:text="第二个"/> </LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="match_parent" android:id="@+id/layout03" android:orientation="vertical"> <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:text="第三个"/> </LinearLayout> </TabWidget> </LinearLayout> </TabHost>

//主页面文件布局

//创建一个类去继承TabActivity public class Main2Activity extends TabActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main2); //获得TabHost对象 TabHost tabHost = getTabHost(); //添加Tab tabHost.addTab(tabHost.newTabSpec("aaa") .setIndicator("新闻").setContent(R.id.layout01)); tabHost.addTab(tabHost.newTabSpec("bbb") .setIndicator("体育").setContent(R.id.layout01)); tabHost.addTab(tabHost.newTabSpec("ccc") .setIndicator("人文").setContent(R.id.layout01)); tabHost.getChildAt(0).setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Toast.makeText(Main2Activity.this,"点击了界面",Toast.LENGTH_SHORT).show(); } }); } }