Android如何将listview放入查看寻呼机片段
我已经在Eclipse中使用这个模板实现了一个使用viewpager的swipey tabs应用程序 现在我得到了一个活动,它像这样扩展了碎片活动Android如何将listview放入查看寻呼机片段,android,android-listview,android-fragments,android-viewpager,Android,Android Listview,Android Fragments,Android Viewpager,我已经在Eclipse中使用这个模板实现了一个使用viewpager的swipey tabs应用程序 现在我得到了一个活动,它像这样扩展了碎片活动 package com.example.abcd2; import java.util.Locale; import android.os.Bundle; import android.support.v4.app.Fragment; import android.support.v4.app.F
package com.example.abcd2;
import java.util.Locale;
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 {
/**
* 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);
// 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);
}
@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;
}
/**
* 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.
if(position==0)
{
Fragment frag2=new ShowFrag2();
return frag2;}
else
{
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;
}
}
}
在本文中,为了在其中一个选项卡中创建一个新片段,我在getItem()方法中使用if-else-based-on-position,如图所示。
展示的片段是这样的
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class ShowFrag2 extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.frag2, container, false);
}
}
我的问题是,如何在其中一个片段中创建listview。我只想以这种方式使用简单的listview
LevelAdapter adapter = new LevelAdapter(this,
R.layout.list_item, weather_data);
listView1 = (ListView)findViewById(R.id.listView1);
listView1.setAdapter(adapter);
但这是在一项活动中完成的。我怎样才能在上面的片段中使用这样的东西。另外,我不能使用ListFragment,因为getView()方法正在返回一个片段。
请帮助了解如何实现此功能。
谢谢
编辑:
以下是我的适配器代码:
package com.example.abcd3;
import android.app.Activity;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;
public class LevelAdapter extends ArrayAdapter<Level> {
static Context context;
static int layoutResourceId;
static Level data[] = null;
/* public LevelAdapter(Context context, int layoutResourceId, Level[] data) {
super(context, layoutResourceId, data);
this.layoutResourceId = layoutResourceId;
this.context = context;
this.data = data;
}*/
public LevelAdapter(ShowFrag1 showFrag1, int listItem,
Level[] weather_data) {
super(context, layoutResourceId, data);
this.layoutResourceId = layoutResourceId;
this.context = context;
this.data = data;
// TODO Auto-generated constructor stub
}
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View row = convertView;
WeatherHolder holder = null;
if(row == null)
{
LayoutInflater inflater = ((Activity)context).getLayoutInflater();
row = inflater.inflate(layoutResourceId, parent, false);
holder = new WeatherHolder();
holder.imgIcon = (ImageView)row.findViewById(R.id.imgIcon);
holder.txtTitle = (TextView)row.findViewById(R.id.txtTitle);
// holder.imgIcon2=(ImageView)row.findViewById(R.id.imgIcon2);
row.setTag(holder);
}
else
{
holder = (WeatherHolder)row.getTag();
}
Level weather = data[position];
holder.txtTitle.setText(weather.title);
holder.imgIcon.setImageResource(weather.icon);
return row;
}
static class WeatherHolder
{
ImageView imgIcon;
TextView txtTitle;
// ImageView imgIcon2;
}
}
package com.example.abcd3;
导入android.app.Activity;
导入android.content.Context;
导入android.view.LayoutInflater;
导入android.view.view;
导入android.view.ViewGroup;
导入android.widget.ArrayAdapter;
导入android.widget.ImageView;
导入android.widget.TextView;
公共类级别适配器扩展了ArrayAdapter{
静态语境;
静态int布局资源ID;
静态级别数据[]=null;
/*公共级别适配器(上下文上下文,int-layoutResourceId,级别[]数据){
超级(上下文、布局资源ID、数据);
this.layoutResourceId=layoutResourceId;
this.context=上下文;
这个数据=数据;
}*/
公共级别适配器(ShowFrag1 ShowFrag1,int-listItem,
级别[]天气数据){
超级(上下文、布局资源ID、数据);
this.layoutResourceId=layoutResourceId;
this.context=上下文;
这个数据=数据;
//TODO自动生成的构造函数存根
}
公共长getItemId(int位置){
返回位置;
}
@凌驾
公共视图getView(int位置、视图转换视图、视图组父视图){
视图行=转换视图;
WeatherHolder=null;
if(行==null)
{
LayoutInflater充气器=((活动)上下文)。getLayoutInflater();
行=充气机。充气(layoutResourceId,父级,false);
支架=新的密封支架();
holder.imgIcon=(ImageView)row.findViewById(R.id.imgIcon);
holder.txtTitle=(TextView)row.findViewById(R.id.txtTitle);
//holder.imgIcon2=(ImageView)row.findViewById(R.id.imgIcon2);
row.setTag(支架);
}
其他的
{
holder=(WeatherHolder)row.getTag();
}
水平天气=数据[位置];
holder.txtTitle.setText(weather.title);
holder.imgIcon.setImageResource(weather.icon);
返回行;
}
静态类风挡
{
ImageView imgIcon;
TextView-txtTitle;
//ImageView imgIcon2;
}
}
确保在R.layout.frag2
中定义了ListView
,并在ShowFrag2
的onCreateView
中将适配器设置为ListView。(类似于其在活动中完成的方式)
谢谢,但是如果我尝试您在片段中所说的,那么findviewbyid()和getlistview()函数不会出现在可用函数列表中。如果可能的话,你能发布一些示例代码吗?添加了一个示例,你可以按照它来做。我没有测试它,但是您得到了这样一个想法:我在line inflater行中得到了一个空指针异常,即使我已经定义了XML文件,也在我们创建适配器对象的行中。请检查更新的问题。我已经为我的适配器添加了代码,它给出了空指针异常。如果我从适配器的代码中删除“static”,那么在创建适配器对象的行中也会出现错误。错在哪里?我得到了nullpointerexception:storage==Null我认为问题在于构造函数与片段不兼容。我如何纠正这一点?
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View fragmentLayout = inflater.inflate(R.layout.frag2, container, false);
ListView listView1 = (ListView) fragmentLayout.findViewById(R.id.mylistview);
LevelAdapter adapter = new LevelAdapter(this, R.layout.list_item, weather_data);
listView1 = (ListView)findViewById(R.id.listView1);
listView1.setAdapter(adapter);
return fragmentLayout;
}