我是Android programming的新手，所以对我很轻松。 ： - ）
我有一个项目列表，当用户点击某个项目时，它会将他们带到具有该项目详细信息的屏幕。用户可以向右和向左滑动以查看列表中其他项目的详细信息 我有一些ActionBar图标，如分享，增加字体大小等等 我的问题是：如果我在列表中选择item1并转到具有该项目详细信息的屏幕，如果我滑动到item2然后单击共享，则共享item1的内容而不是item2。 增加或减少字体也会发生同样的事情。如果我选择item2然后滑动到item3并增加字体大小，则item2的字体大小增加而不是item3 我尝试了很多东西，比如使用SimpleOnPageChangeListener但没有用，我不知道如何正确实现它。
这是我的代码：
包含列表视图的主要活动：
public class Main extends SherlockListActivity implements OnItemClickListener {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
ListView mylist = (ListView) findViewById(android.R.id.list);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, R.layout.simple_list_reda_1, R.id.list_content, getResources().getStringArray(R.array.items_list_array) );
mylist.setAdapter(adapter);
mylist.setOnItemClickListener(new OnItemClickListener()
{
public void onItemClick(AdapterView<?> arg0,View arg1, int position, long arg3)
{
Intent n = null;
switch (position){
case 0:
n = new Intent(getApplicationContext(), ViewPagerClass.class);
n.putExtra("POSITION_KEY", position);
break;
case 1:
n = new Intent(getApplicationContext(), ViewPagerClass.class);
n.putExtra("POSITION_KEY", position);
break;
case 2:
n = new Intent(getApplicationContext(), ViewPagerClass.class);
n.putExtra("POSITION_KEY", position);
break;
case 3:
n = new Intent(getApplicationContext(), ViewPagerClass.class);
n.putExtra("POSITION_KEY", position);
break;
}
if(null!=n)
startActivity(n);
}
});
}
}
ViewPagerClass：
public class ViewPagerClass extends SherlockFragmentActivity{
static final int NUM_ITEMS = 4;
MyAdapter mAdapter;
ViewPager mPager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
super.setContentView(R.layout.viewpager_layout);
mAdapter = new MyAdapter(getSupportFragmentManager());
mPager = (ViewPager) findViewById(R.id.viewpager);
mPager.setAdapter(mAdapter);
//mPager.setCurrentItem(2);
final ActionBar ab = getSupportActionBar();
ab.setDisplayHomeAsUpEnabled(true);
ab.setDisplayUseLogoEnabled(false);
ab.setDisplayShowHomeEnabled(false);
}
public boolean onCreateOptionsMenu(Menu menu) {
mainMenu = menu;
subMenu1 = menu.addSubMenu(0, 1, 7, "");
subMenu2 = menu.addSubMenu(0, 2, 6, "");
subMenu3 = menu.addSubMenu(0, 3, 5, "");
//some code here...
MenuItem share = menu.findItem(R.id.menu_share);
ShareActionProvider provider = (ShareActionProvider) share.getActionProvider();
provider.setShareHistoryFileName(null);
provider.setShareIntent(createShareIntent());
getSupportMenuInflater().inflate(R.menu.textsize_subm, subMenu3);
MenuItem subMenu3Item = subMenu3.getItem();
subMenu3Item.setIcon(R.drawable.ic_font_size);
subMenu3Item.setShowAsAction(MenuItem.SHOW_AS_ACTION_ALWAYS);
return true;
}
private Intent createShareIntent() {
TextView tv = (TextView) findViewById(R.id.textView1);
Intent shareIntent = new Intent(Intent.ACTION_SEND);
shareIntent.putExtra(Intent.EXTRA_TEXT, tv.getText());
shareIntent.setType("text/plain");
return shareIntent;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle item selection
switch (item.getItemId()) {
//some code here...
default:
return super.onOptionsItemSelected(item);
}
}
public static class MyAdapter extends FragmentPagerAdapter {
public MyAdapter(FragmentManager fm) {
super(fm);
}
@Override
public int getCount() {
return NUM_ITEMS;
}
@Override
public Fragment getItem(int position) {
switch(position){
case 0: return FirstPageFragment.newInstance();
case 1: return SecondPageFragment.newInstance();
case 2: return ThirdPageFragment.newInstance();
case 3: return FourthPageFragment.newInstance();
}
return null;
}
}
public static class FirstPageFragment extends Fragment {
public static FirstPageFragment newInstance() {
FirstPageFragment f = new FirstPageFragment();
return f;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View V = inflater.inflate(R.layout.fragment1, container, false);
return V;
}
}
public static class SecondPageFragment extends Fragment {
public static SecondPageFragment newInstance() {
SecondPageFragment f = new SecondPageFragment();
return f;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View V = inflater.inflate(R.layout.fragment2, container, false);
return V;
}
}
public static class ThirdPageFragment extends Fragment {
public static ThirdPageFragment newInstance() {
ThirdPageFragment f = new ThirdPageFragment();
return f;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View V = inflater.inflate(R.layout.fragment3, container, false);
return V;
}
}
public static class FourthPageFragment extends Fragment {
public static FourthPageFragment newInstance() {
FourthPageFragment f = new FourthPageFragment();
return f;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View V = inflater.inflate(R.layout.fragment4, container, false);
return V;
}
}
简而言之：菜单/操作栏图标不会更新以在刷卡后响应当前页面。 我希望我的问题很明确。
答案 0 :(得分：0)
我想通了，所以我想我会在这里发帖以防万一有人遇到同样的问题。 实际上解决方案非常简单，我不知道为什么我没有立刻解决它。
我使用'setOnPageChangeListener'＆amp;把它放在'onCreate'
这是我的代码：
int pageNum;
myPager.setOnPageChangeListener(
new ViewPager.SimpleOnPageChangeListener() {
@Override
public void onPageSelected(int position) {
//Here I put the code I want to call/update when the page changes (i.e swipe)
pageNum = myPager.getCurrentItem();
//update actionprovider & share intent after swiping
ShareActionProvider mShareActionProvider = (ShareActionProvider) item.getActionProvider();
mShareActionProvider.setShareIntent(createShareIntent());
//I can also put a switch statement here, depending on which page.
switch (pageNum) {
case 0: //.....