与标签和碎片问题 [英] problems with the tabs and the fragment
问题描述
我创建的应用程序选项卡的固定刷卡+与Eclipse,我不明白我怎么能为每个标签片段。我知道这是一个愚蠢的问题,但我只是无法理解。感谢所有谁回应。
在code是如下:
包com.example.newapp;进口java.util.Locale中;进口android.app.ActionBar;
进口android.app.FragmentTransaction;
进口android.os.Bundle;
进口android.support.v4.app.Fragment;
进口android.support.v4.app.FragmentActivity;
进口android.support.v4.app.FragmentManager;
进口android.support.v4.app.FragmentPagerAdapter;
进口android.support.v4.app.NavUtils;
进口android.support.v4.view.ViewPager;
进口android.view.Gravity;
进口android.view.LayoutInflater;
进口android.view.Menu;
进口android.view.MenuItem;
进口android.view.View;
进口android.view.ViewGroup;
进口android.widget.TextView;公共类MainActivity扩展FragmentActivity工具
ActionBar.TabListener {/ **
*本{@link android.support.v4.view.PagerAdapter},将提供
*对于每个部分的片段。我们使用
* {@link android.support.v4.app.FragmentPagerAdapter}衍生物,其
*将让每一个片段加载在内存中。如果这成为太内存
*密集,它可能是最好切换到
* {@link android.support.v4.app.FragmentStatePagerAdapter}。
* /
SectionsPagerAdapter mSectionsPagerAdapter;/ **
*本{@link ViewPager}将承载部分内容。
* /
ViewPager mViewPager;@覆盖
保护无效的onCreate(捆绑savedInstanceState){
super.onCreate(savedInstanceState);
的setContentView(R.layout.activity_main); //设置操作栏。
最后的动作条动作条= getActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS); //创建将返回一个片段为三个的适配器
//应用的主要部分。
mSectionsPagerAdapter =新SectionsPagerAdapter(
getSupportFragmentManager()); //设置的ViewPager与部分适配器。
mViewPager =(ViewPager)findViewById(R.id.pager);
mViewPager.setAdapter(mSectionsPagerAdapter); //当不同部分之间滑动,选择对应的
// 标签。我们也可以使用ActionBar.Tab#select()来做到这一点,如果我们有
//为Tab的参考。
mViewPager
.setOnPageChangeListener(新ViewPager.SimpleOnPageChangeListener(){
@覆盖
公共无效使用onPageSelected(INT位置){
actionBar.setSelectedNavigationItem(位置);
}
}); //对于每一个应用中的部分,添加标签,操作栏。
的for(int i = 0; I< mSectionsPagerAdapter.getCount();我++){
//创建对应于定义的页面标题文字标签
//适配器。同时,指定此活动的对象,它实现
//将TabListener接口,回调(监听程序)进行时
//这个选项卡中选择。
actionBar.addTab(actionBar.newTab()
.setText(mSectionsPagerAdapter.getPageTitle(I))
.setTabListener(本));
}
}@覆盖
公共布尔onCreateOptionsMenu(菜单菜单){
//充气菜单;如果是present这增加了项目操作栏。
。getMenuInflater()膨胀(R.menu.main,菜单);
返回true;
}@覆盖
公共无效onTabSelected(ActionBar.Tab选项卡,
FragmentTransaction fragmentTransaction){
//当选择给定的标签上,切换到相应的页面
//的ViewPager。
mViewPager.setCurrentItem(tab.getPosition());
}@覆盖
公共无效onTabUnselected(ActionBar.Tab选项卡,
FragmentTransaction fragmentTransaction){
}@覆盖
公共无效onTabReselected(ActionBar.Tab选项卡,
FragmentTransaction fragmentTransaction){
}/ **
* A {@link FragmentPagerAdapter}返回对应片段
*章节/标签/页面。
* /
公共类SectionsPagerAdapter扩展FragmentPagerAdapter { 公共SectionsPagerAdapter(FragmentManager FM){
超(FM);
} @覆盖
公共片段的getItem(INT位置){
//的getItem被称为实例化片段为给定的页面。
//返回一个DummySectionFragment(定义为静态内部类
//下面)附页码为它的独立参数。
片段片段=新DummySectionFragment();
捆绑ARGS =新包();
args.putInt(DummySectionFragment.ARG_SECTION_NUMBER,位置+ 1);
fragment.setArguments(参数);
返回片段;
} @覆盖
公众诠释的getCount(){
//显示3总页数。
返回3;
} @覆盖
公共CharSequence的getPageTitle(INT位置){
区域设置L = Locale.getDefault();
开关(位置){
情况下0:
返回的getString(R.string.title_section1).toUpperCase(升);
情况1:
返回的getString(R.string.title_section2).toUpperCase(升);
案例2:
返回的getString(R.string.title_section3).toUpperCase(升);
}
返回null;
}
}/ **
*一个虚拟片段重新presenting应用程序的一部分,但只是
*显示虚拟文本。
* /
公共静态类DummySectionFragment扩展片段{
/ **
*片段参数重新presenting本节号
*片段。
* /
公共静态最后弦乐ARG_SECTION_NUMBER =SECTION_NUMBER; 公共DummySectionFragment(){
} @覆盖
公共查看onCreateView(LayoutInflater充气器,容器的ViewGroup,
捆绑savedInstanceState){
查看rootView = inflater.inflate(R.layout.fragment_main_dummy,
集装箱,FALSE);
TextView的dummyTextView =(TextView中)rootView
.findViewById(R.id.section_label);
dummyTextView.setText(Integer.toString(getArguments()调用getInt(
ARG_SECTION_NUMBER)));
返回rootView;
}
}
}
片段在你实施 FragmentPagerAdapter
(要创建 SectionsPagerAdapter
),在方法的getItem()
。见例如:
@覆盖
公共片段的getItem(INT位置){
开关(位置){
情况下0:
返回新MyFragment0();
情况1:
返回新MyFragment1();
案例2:
返回新MyFragment2();
}
返回null;
}
的 getCount将
方法应该返回要提供碎片的数量。然后, FragmentActivity
将调用的getItem
需要一个片段时。
I created an application "fixed tabs + swipe" with Eclipse, I can not understand how I can create a Fragment for each tab. I know it's a stupid question but I just can not understand. Thanks to all who respond. The code is as follows
package com.example.newapp;
import java.util.Locale;
import android.app.ActionBar;
import android.app.FragmentTransaction;
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.NavUtils;
import android.support.v4.view.ViewPager;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
public class MainActivity extends FragmentActivity implements
ActionBar.TabListener {
/**
* The {@link android.support.v4.view.PagerAdapter} that will provide
* fragments for each of the sections. We use a
* {@link android.support.v4.app.FragmentPagerAdapter} derivative, which
* will keep every loaded fragment in memory. If this becomes too memory
* intensive, it may be best to switch to a
* {@link android.support.v4.app.FragmentStatePagerAdapter}.
*/
SectionsPagerAdapter mSectionsPagerAdapter;
/**
* The {@link ViewPager} that will host the section contents.
*/
ViewPager mViewPager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Set up the action bar.
final ActionBar actionBar = getActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
// Create the adapter that will return a fragment for each of the three
// primary sections of the app.
mSectionsPagerAdapter = new SectionsPagerAdapter(
getSupportFragmentManager());
// Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setAdapter(mSectionsPagerAdapter);
// When swiping between different sections, select the corresponding
// tab. We can also use ActionBar.Tab#select() to do this if we have
// a reference to the Tab.
mViewPager
.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
@Override
public void onPageSelected(int position) {
actionBar.setSelectedNavigationItem(position);
}
});
// For each of the sections in the app, add a tab to the action bar.
for (int i = 0; i < mSectionsPagerAdapter.getCount(); i++) {
// Create a tab with text corresponding to the page title defined by
// the adapter. Also specify this Activity object, which implements
// the TabListener interface, as the callback (listener) for when
// this tab is selected.
actionBar.addTab(actionBar.newTab()
.setText(mSectionsPagerAdapter.getPageTitle(i))
.setTabListener(this));
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public void onTabSelected(ActionBar.Tab tab,
FragmentTransaction fragmentTransaction) {
// When the given tab is selected, switch to the corresponding page in
// the ViewPager.
mViewPager.setCurrentItem(tab.getPosition());
}
@Override
public void onTabUnselected(ActionBar.Tab tab,
FragmentTransaction fragmentTransaction) {
}
@Override
public void onTabReselected(ActionBar.Tab tab,
FragmentTransaction fragmentTransaction) {
}
/**
* A {@link FragmentPagerAdapter} that returns a fragment corresponding to
* one of the sections/tabs/pages.
*/
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
// getItem is called to instantiate the fragment for the given page.
// Return a DummySectionFragment (defined as a static inner class
// below) with the page number as its lone argument.
Fragment fragment = new DummySectionFragment();
Bundle args = new Bundle();
args.putInt(DummySectionFragment.ARG_SECTION_NUMBER, position + 1);
fragment.setArguments(args);
return fragment;
}
@Override
public int getCount() {
// Show 3 total pages.
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;
}
}
/**
* A dummy fragment representing a section of the app, but that simply
* displays dummy text.
*/
public static class DummySectionFragment extends Fragment {
/**
* The fragment argument representing the section number for this
* fragment.
*/
public static final String ARG_SECTION_NUMBER = "section_number";
public DummySectionFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main_dummy,
container, false);
TextView dummyTextView = (TextView) rootView
.findViewById(R.id.section_label);
dummyTextView.setText(Integer.toString(getArguments().getInt(
ARG_SECTION_NUMBER)));
return rootView;
}
}
}
The Fragments have to be created in your implementation of the FragmentPagerAdapter
(SectionsPagerAdapter
), in the method getItem()
. See example :
@Override
public Fragment getItem(int position) {
switch (position) {
case 0:
return new MyFragment0();
case 1:
return new MyFragment1();
case 2:
return new MyFragment2();
}
return null;
}
The getCount
method should return the number of fragments you want to be available. Then, the FragmentActivity
will call getItem
when a fragment is needed.
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