如何根据标签栏项目启动活动?
问题描述:
我想根据标签栏项目的点击开始不同的活动,但我在“windows class”中获得了一个空白页面作为已启动的活动。我打算做的是在点击标签栏项目上开始不同的活动。如何根据标签栏项目启动活动?
标签栏活动课
import android.app.ActionBar;
import android.app.Activity;
import android.app.FragmentTransaction;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.view.ViewPager;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TabHost;
public class TabBar extends FragmentActivity {
ViewPager Tab;
TabPagerAdapter TabAdapter;
ActionBar actionBar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.tabbardefault);
try {
TabAdapter = new TabPagerAdapter(getSupportFragmentManager());
Tab = (ViewPager) findViewById(R.id.pager);
Tab.setOnPageChangeListener(
new ViewPager.SimpleOnPageChangeListener() {
@Override
public void onPageSelected(int position) {
actionBar = getActionBar();
actionBar.setSelectedNavigationItem(position);
}
});
Tab.setAdapter(TabAdapter);
actionBar = getActionBar();
//Enable Tabs on Action Bar
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
}
catch (Exception e)
{
}
ActionBar.TabListener tabListener = new ActionBar.TabListener(){
@Override
public void onTabReselected(android.app.ActionBar.Tab tab,
FragmentTransaction ft) {
// TODO Auto-generated method stub
}
@Override
public void onTabSelected(ActionBar.Tab tab, FragmentTransaction ft) {
Tab.setCurrentItem(tab.getPosition());
}
@Override
public void onTabUnselected(android.app.ActionBar.Tab tab,
FragmentTransaction ft) {
// TODO Auto-generated method stub
}};
//Add New Tab
actionBar.addTab(actionBar.newTab().setText("Home").setTabListener(tabListener));
actionBar.addTab(actionBar.newTab().setText("Celeb").setTabListener(tabListener));
actionBar.addTab(actionBar.newTab().setText("Videos").setTabListener(tabListener));
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_tab_bar, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
TabPagerAdapter
import android.content.Intent;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentStatePagerAdapter;
public class TabPagerAdapter extends FragmentStatePagerAdapter {
public TabPagerAdapter(FragmentManager fm) {
super(fm);
// TODO Auto-generated constructor stub
}
@Override
public Fragment getItem(int i) {
switch (i) {
case 0:
//Fragement for Android Tab
return new Android();
case 1:
//Fragment for Ios Tab
return new Ios();
case 2:
//Fragment for Windows Tab
return new Windows();
}
return null;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return 3; //No of Tabs
}
}
的Windows
public class Windows extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View windows = inflater.inflate(R.layout.feed_main, container, false);
//((TextView)windows.findViewById(R.id.textView)).setText("Windows");
return windows;
}}
答
要回答你,你实际上并没有开始一个活动,您通过碎片开关,片段只是一个自定义视图,你膨胀一个XML来表示自定义视图的片段,如果你想开始一个活动被选中后,你的选项卡,然后调用startActivity(Intent);
startActivity(new Intent(classname.this,the_class_i_want_to_start.class));
和你Windows
类扩展Fragment
它应该是Activity
如果你想要的是Fragment
那么你是不是有问题
希望其清醒
活动或片段? – Elltz
@Elltz活动,因为我有三个不同的活动,我想在这个过程中指出 –
好吧,那么你想开始的活动在哪里?因为看你的代码,你实际上并没有开始任何活动只是试图在片段之间切换 – Elltz