问题
I am a beginner to android applications and java, basically I am a PHP developer.
I've a project for a tab+swipe application,
Reseller.java
package com.idevoc.onsitereseller;
import java.util.ArrayList;
import android.app.ActionBar;
import android.app.ActionBar.Tab;
import android.app.Activity;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.view.ViewPager;
import android.view.Menu;
import android.view.MenuInflater;
public class Reseller extends FragmentActivity {
FragmentTransaction transaction;
static ViewPager mViewPager;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_reseller);
Fragment tabOneFragment = new TabOne();
Fragment tabTwoFragment = new TabTwo();
PagerAdapter mPagerAdapter = new PagerAdapter(getSupportFragmentManager());
mPagerAdapter.addFragment(tabOneFragment);
mPagerAdapter.addFragment(tabTwoFragment);
//transaction = getSupportFragmentManager().beginTransaction();
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setAdapter(mPagerAdapter);
mViewPager.setOffscreenPageLimit(2);
mViewPager.setCurrentItem(0);
mViewPager.setOnPageChangeListener(
new ViewPager.SimpleOnPageChangeListener() {
@Override
public void onPageSelected(int position) {
// When swiping between pages, select the
// corresponding tab.
getActionBar().setSelectedNavigationItem(position);
}
});
ActionBar ab = getActionBar();
ab.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
Tab tab1 = ab.newTab().setText("Tab One")
.setTabListener(new TabListener<TabOne>(
this, "tabone", TabOne.class));
Tab tab2 = ab.newTab().setText("Tab Two")
.setTabListener(new TabListener<TabTwo>(
this, "tabtwo", TabTwo.class));
ab.addTab(tab1);
ab.addTab(tab2);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.menu, menu);
return true;
}
public static class TabListener<T extends Fragment> implements ActionBar.TabListener {
private Fragment mFragment;
private final Activity mActivity;
private final String mTag;
private final Class<T> mClass;
/** Constructor used each time a new tab is created.
* @param activity The host Activity, used to instantiate the fragment
* @param tag The identifier tag for the fragment
* @param clz The fragment's Class, used to instantiate the fragment
*/
public TabListener(Activity activity, String tag, Class<T> clz) {
mActivity = activity;
mTag = tag;
mClass = clz;
}
/* The following are each of the ActionBar.TabListener callbacks */
public void onTabSelected(Tab tab, FragmentTransaction ft) {
// Check if the fragment is already initialized
if (mFragment == null) {
// If not, instantiate and add it to the activity
mFragment = Fragment.instantiate(mActivity, mClass.getName());
ft.add(android.R.id.content, mFragment, mTag);
} else {
// If it exists, simply attach it in order to show it
ft.attach(mFragment);
}
}
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
if (mFragment != null) {
// Detach the fragment, because another one is being attached
ft.detach(mFragment);
}
}
public void onTabReselected(Tab tab, FragmentTransaction ft) {
// User selected the already selected tab. Usually do nothing.
}
public void onTabReselected(Tab arg0,
android.app.FragmentTransaction arg1)
{
}
public void onTabSelected(Tab arg0, android.app.FragmentTransaction arg1)
{
mViewPager.setCurrentItem(arg0.getPosition());
}
public void onTabUnselected(Tab arg0,
android.app.FragmentTransaction arg1)
{
}
}
public class PagerAdapter extends FragmentPagerAdapter{
private final ArrayList<Fragment> mFragments = new ArrayList<Fragment>();
public PagerAdapter(FragmentManager manager){
super(manager);
}
public void addFragment(Fragment fragment){
mFragments.add(fragment);
notifyDataSetChanged();
}
@Override
public int getCount() {
return mFragments.size();
}
@Override
public Fragment getItem(int position) {
return mFragments.get(position);
}
}
}
TabOne.java
package com.idevoc.onsitereseller;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class TabOne extends Fragment
{
public static final String ARG_SECTION_NUMBER = "section_number";
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState)
{
View view = inflater.inflate(R.layout.tab_a, container, false);
return view;
}
}
TabTwo.java
package com.idevoc.onsitereseller;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class TabTwo extends Fragment
{
@Override
public void onActivityCreated(Bundle savedInstanceState){
super.onActivityCreated(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState)
{
View view = inflater.inflate(R.layout.tab_a, container, false);
return view;
}
}
Here I am loading two tabs for the application and loading a common menu, but I need to load a different menu for different tabs like:
if the tab is TabOne then load menu_a, if tab is TabTwo then load menu_b with different options. I don't want to load the common menu. How can I do this?
回答1:
create a menu xml file for menu_a.xml and menu_b.xml in the res/menu folder.
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<item android:id="@+id/menu_item_search"
android:icon="@drawable/ic_action_search"
android:title="@string/description_search"
android:orderInCategory="1"
android:showAsAction="ifRoom" />
<item android:id="@+id/menu_item_share"
android:icon="@drawable/ic_action_share"
android:title="@string/description_share"
android:orderInCategory="1"
android:showAsAction="ifRoom" />
</menu>
To create a option menu for the current Fragment displayed, add setHasOptionsMenu(true); to the Fragment onCreate() method.
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setHasOptionsMenu(true);
}
Then you must inflate the corresponding option menu (menu_a.xml or menu_b.xml) by override the onCreateOptionsMenu() method.
@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
inflater.inflate(R.menu.menu_a, menu);
super.onCreateOptionsMenu(menu, inflater);
}
For handling menu selections override the onOptionsItemSelected()
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.menu_item_search:
//do something
return true;
case R.id.menu_item_share:
//do something
return true;
}
return super.onOptionsItemSelected(item);
}
see Creating an Options Menu: http://developer.android.com/guide/topics/ui/menus.html for more details.
回答2:
Yes, I got the output with these codes ,
In TabOne.java and TabTwo.java I've added
setHasOptionsMenu(true);
In onCreateView() function and after that menu function with different menu,removed menu function from main class.
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState)
{
View view = inflater.inflate(R.layout.tab_a, container, false);
setHasOptionsMenu(true);
return view;
}
@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
// TODO Auto-generated method stub
//super.onCreateOptionsMenu(menu, inflater);
inflater.inflate(R.menu.menu_b, menu);
}
来源：https://stackoverflow.com/questions/14019599/different-menu-for-different-tabs-in-tabswipe-application-for-android-project