【发布时间】：2013-01-27 00:58:17
【问题描述】：
我是Android programming 的新手，所以请放轻松。 :-)
我有一个项目列表，当用户点击一个项目时，它会将他们带到一个包含该项目详细信息的屏幕。用户可以左右滑动查看列表中其他项目的详细信息。
我有一些 ActionBar 图标，例如分享、增加字体大小...等
我的问题是：如果我在列表中选择 item1 并进入包含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 item2 的字体大小会增加而不是 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/操作栏图标在滑动后不会更新以响应当前页面。 我希望我的问题很清楚。
【问题讨论】：
标签： android eclipse android-actionbar android-viewpager