Java 从mainactivity更新片段
我正在用带有SectionsPagerAdapter和Placeholder片段的ActionBar制作一个程序。我在MainActivity中通过BroadcastReceiver接收数据,我想知道在我的BroadcastReceiver中接收到某些数据时如何更新当前片段。我是一个初学者,我发现了很多替代方法,但没有一个使用占位符(像我的),而这个方法(占位符)是我发现的唯一一个解释和发展良好的例子。提前谢谢Java 从mainactivity更新片段,java,android,placeholder,Java,Android,Placeholder,我正在用带有SectionsPagerAdapter和Placeholder片段的ActionBar制作一个程序。我在MainActivity中通过BroadcastReceiver接收数据,我想知道在我的BroadcastReceiver中接收到某些数据时如何更新当前片段。我是一个初学者,我发现了很多替代方法,但没有一个使用占位符(像我的),而这个方法(占位符)是我发现的唯一一个解释和发展良好的例子。提前谢谢 public class MainActivity extends Activity
public class MainActivity extends Activity implements ActionBar.TabListener
{
SectionsPagerAdapter mSectionsPagerAdapter;
ViewPager mViewPager;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final ActionBar actionBar = getActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
mSectionsPagerAdapter = new SectionsPagerAdapter(getFragmentManager());
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setAdapter(mSectionsPagerAdapter);
mViewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener()
{
@Override
public void onPageSelected(int position)
{
actionBar.setSelectedNavigationItem(position);
}
});
for (int i = 0; i < mSectionsPagerAdapter.getCount(); i++)
{
actionBar.addTab(actionBar.newTab()
.setText(mSectionsPagerAdapter.getPageTitle(i))
.setTabListener(this));
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu)
{
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item)
{
int id = item.getItemId();
if (id == R.id.action_settings)
{
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
public void onTabSelected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction)
{
mViewPager.setCurrentItem(tab.getPosition());
}
@Override
public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction)
{
}
@Override
public void onTabReselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction)
{
}
public class SectionsPagerAdapter extends FragmentPagerAdapter
{
public SectionsPagerAdapter(FragmentManager fm)
{
super(fm);
}
@Override
public Fragment getItem(int position)
{
return PlaceholderFragment.newInstance(position);
}
@Override
public int getCount()
{
return 3;
}
@Override
public CharSequence getPageTitle(int position)
{
Locale l = Locale.getDefault();
switch (position)
{
case 0:
return getString(R.string.title_section1).toUpperCase(l);
case 1:
return getString(R.string.title_section2).toUpperCase(l);
case 2:
return getString(R.string.title_section3).toUpperCase(l);
}
return null;
}
}
public static class PlaceholderFragment extends Fragment
{
private static final String ARG_SECTION_NUMBER = "section_number";
public View rootView;
private ToggleButton togg_Connect;
public static PlaceholderFragment newInstance(int sectionNumber)
{
PlaceholderFragment fragment = new PlaceholderFragment();
Bundle args = new Bundle();
args.putInt(ARG_SECTION_NUMBER, sectionNumber);
fragment.setArguments(args);
return fragment;
}
public PlaceholderFragment()
{
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
switch (getArguments().getInt(ARG_SECTION_NUMBER))
{
case 2:
rootView = inflater.inflate(R.layout.fragment_page3, container, false);
break;
case 1:
rootView = inflater.inflate(R.layout.fragment_page2, container, false);
break;
default:
rootView = inflater.inflate(R.layout.fragment_main, container, false);
break;
}
return rootView;
}
@Override
public void onDestroyView()
{
switch (getArguments().getInt(ARG_SECTION_NUMBER))
{
case 2:
break;
case 1:
break;
default:
break;
}
super.onDestroyView();
}
@Override
public void setUserVisibleHint(boolean isVisibleToUser)
{
super.setUserVisibleHint(isVisibleToUser);
}
}
private BroadcastReceiver ApplicationReceiver = new BroadcastReceiver()
{
@Override
public void onReceive(Context context, Intent mIntent)
{
**********************************************
**********************************************
**********************************************
NOW AT THIS POINT I WANT TO UPDATE THE CURRENT
FRAGMENT ACCORDING THE RECEIVED DATA
**********************************************
**********************************************
**********************************************
return;
}
};
}
公共类MainActivity扩展活动实现ActionBar.TabListener
{
分段SPAGERADAPTER mSectionsPagerAdapter;
ViewPager mViewPager;
@凌驾
创建时受保护的void(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
最终ActionBar ActionBar=getActionBar();
actionBar.setNavigationMode(actionBar.NAVIGATION\u MODE\u选项卡);
mSectionsPagerAdapter=newsectionspageradapter(getFragmentManager());
mViewPager=(ViewPager)findViewById(R.id.pager);
mViewPager.setAdapter(mSectionsPagerAdapter);
mViewPager.setOnPageChangeListener(新的ViewPager.SimpleOnPageChangeListener()
{
@凌驾
已选择页面上的公共无效(内部位置)
{
actionBar.setSelectedNavigationItem(位置);
}
});
对于(int i=0;i
什么向接收者发送意图?这是服务吗?您可以从接收者向活动发送意图,该活动包含片段并对其进行更新。是的,它是一项服务。我正在制作一个聊天客户端,我已经完成了服务和tcp com的所有工作。我只需要将所有数据(在线用户、上次聊天信息等)传送到用户界面。我正在将数据存储在mainactivity中,现在