大佬教程收集整理的这篇文章主要介绍了Android:当我启动一项新活动时,Listview会自行复制,然后按回去返回它,大佬教程大佬觉得挺不错的,现在分享给大家,也给大家做个参考。
这是列表视图片段(Due_Today_Fragment)的代码,它位于双标签活动中.
import java.util.ArrayList; import java.util.List; import android.content.Intent; import android.os.bundle; import android.support.v4.app.Fragment; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.ImageView; import android.widget.ListView; import android.widget.TextView; public class Due_Today_Fragment extends Fragment { private List<homeworkdue> myhomeworkdue; static class ViewHolder { public ImageView imageView; public TextView HomeworkDueText; public TextView Descriptiontext; public TextView TeacherText; } public static final String KEY_HOMEWORK="homework"; public static final String KEY_DESC="desc"; public View onCreateView(LayoutInflater inflater,ViewGroup container,Bundle savedInstanceStatE){ return inflater.inflate(R.layout.activity_main,container,falsE); } @Override public void onResume() { // TODO Auto-generated method stub super.onResume(); myhomeworkdue = new ArrayList<homeworkdue>(); populatehomeworkdueList(); populateListView(); registerClickCallBACk(); } private void registerClickCallBACk() { ListView list = (ListView)getView().findViewById(R.id.listView1); list.setOnItemClickListener(new AdapterView.onItemClickListener() { public void onItemClick(AdapterView<?> parent,View viewClicked,int position,long id) { homeworkdue clickedhomeworkdue = myhomeworkdue.get(position); Intent intent = new Intent(getActivity(),homeworkdueDetailsActivity.class); intent.putExtra(KEY_HOMEWORK,clickedhomeworkdue.getHomeworkdue()); intent.putExtra(KEY_DESC,clickedhomeworkdue.getDesciption()); startActivity(intent); } }); } private void populatehomeworkdueList() { myhomeworkdue.add(new homeworkdue("History Homework","Description 1",R.drawable.global_studies,"Anderson")); myhomeworkdue.add(new homeworkdue("Math Homework","Description 2",R.drawable.mathematics,"Klein")); myhomeworkdue.add(new homeworkdue("English Homework","Description 3",R.drawable.english,"Reed")); myhomeworkdue.add(new homeworkdue("Spanish Homework","Description 4",R.drawable.spanish,"Joya")); myhomeworkdue.add(new homeworkdue("Science Homework","Description 5",R.drawable.science,"Poole")); } private void populateListView() { ArrayAdapter<homeworkdue> adapter = new Mylistadapter(); ListView list = (ListView)getView().findViewById(R.id.listView1); list.setAdapter(adapter); } public class Mylistadapter extends ArrayAdapter<homeworkdue> { public Mylistadapter() { super(getActivity(),R.layout.item_view,myhomeworkduE); } @Override public View getView(int position,View convertView,ViewGroup parent) { ViewHolder holder; if(convertView==null){ convertView = getActivity().getLayoutInflater().inflate(R.layout.item_view,parent,falsE); holder = new ViewHolder(); holder.imageView = (ImageView)convertView.findViewById(R.id.item_iconclass); holder.HomeworkDueText = (TextView) convertView.findViewById(R.id.item_texthomeworkduE); holder.Descriptiontext = (TextView) convertView.findViewById(R.id.item_textdescription); holder.TeacherText = (TextView) convertView.findViewById(R.id.item_textteacher); convertView.setTag(holder); } else { holder = (ViewHolder) convertView.getTag(); } homeworkdue currenthomeworkdue = myhomeworkdue.get(position); holder.imageView.setImageresource(currenthomeworkdue.getIconID()); holder.HomeworkDueText.setText(currenthomeworkdue.getHomeworkdue()); holder.Descriptiontext.setText(currenthomeworkdue.getDesciption()); holder.TeacherText.setText(currenthomeworkdue.getTeacher()); return convertView; } } }
import android.app.Activity; import android.content.Intent; import android.os.bundle; import android.view.Menu; import android.widget.TextView; import static com.bernard.beaconportal.Due_Today_Fragment.KEY_HOMEWORK; import static com.bernard.beaconportal.Due_Today_Fragment.KEY_DESc; public class homeworkdueDetailsActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceStatE) { super.onCreate(savedInstanceStatE); setContentView(R.layout.activity_details); String homework = ""; String desc = ""; Intent intent = geTintent(); if (null != intent) { homework = intent.getStringExtra(KEY_HOMEWORK); desc = intent.getStringExtra(KEY_desc); } TextView headlineTxt = (TextView) findViewById(R.id.texthomeworkduE); headlineTxt.setText(homework); TextView pubdateTxt = (TextView) findViewById(R.id.textdescription); pubdateTxt.setText(desc); } }
这是tabs片段的代码
import java.lang.reflect.Field; import com.actionbarsherlock.app.SherlockFragment; import com.astuetz.PagerSlidingTabStrip; import android.os.bundle; import android.support.v4.app.Fragment; import android.support.v4.view.ViewPager; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; public class Fragments2 extends SherlockFragment { @Override public View onCreateView(LayoutInflater inflater,Bundle savedInstanceStatE) { View view = inflater.inflate(R.layout.viewpager_main,falsE); // Locate the ViewPager in viewpager_main.xml ViewPager pager = (ViewPager) view.findViewById(R.id.viewPager); // Set the ViewPagerAdapter into ViewPager pager.setAdapter(new ViewPagerAdapter(getChildFragmentManager())); PagerSlidingTabStrip tabs = (PagerSlidingTabStrip) view.findViewById(R.id.pagerTabStrip); tabs.setViewPager(pager); return view; } @Override public void onDetach() { super.onDetach(); try { Field childFragmentManager = Fragment.class .getDeclaredField("mChildFragmentManager"); childFragmentManager.setAccessible(true); childFragmentManager.set(this,null); } catch (NoSuchFieldException E) { throw new RuntimeException(E); } catch (illegalaccessexception E) { throw new RuntimeException(E); } } }
这里是为家庭作业定义字符串的地方
public class homeworkdue { private String homework; private String desc; privatE int IconID; private String teacher; public homeworkdue(String homework,String desc,int IconID,String teacher) { super(); this.homework = homework; this.desc = desc; this.IconID = IconID; this.teacher = teacher; } public String getHomeworkdue() { return homework; } public String getDesciption() { return desc; } public int getIconID() { return IconID; } public String getTeacher() { return teacher; } }
这是片段的代码,它包含在五个选项卡中
import java.util.ArrayList; import java.util.List; import android.os.bundle; import android.support.v4.app.Fragment; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.ArrayAdapter; import android.widget.ListView; import android.widget.TextView; public class Thursday extends Fragment { public View onCreateView(LayoutInflater inflater,Bundle savedInstanceStatE){ return inflater.inflate(R.layout.schedule_list_view,falsE); } private List<schedule> myschedule = new ArrayList<schedule>(); static class ViewHolder { public TextView HomeworkDueText; } public void onStart() { super.onStart(); populatescheduleList(); populateListView(); } private void populatescheduleList() { myschedule.add(new schedule("E Band")); myschedule.add(new schedule("G Band")); myschedule.add(new schedule("F Band")); myschedule.add(new schedule("H Band")); myschedule.add(new schedule("A Band")); myschedule.add(new schedule("C Band")); myschedule.add(new schedule("D Band")); } private void populateListView() { ArrayAdapter<schedule> adapter = new Mylistadapter(); ListView list = (ListView)getView().findViewById(R.id.listView2); list.setAdapter(adapter); } public class Mylistadapter extends ArrayAdapter<schedule> { public Mylistadapter() { super(getActivity(),myschedulE); } @Override public View getView(int position,ViewGroup parent) { ViewHolder holder; if(convertView==null){ convertView = getActivity().getLayoutInflater().inflate(R.layout.schedule_list_item,falsE); holder = new ViewHolder(); holder.HomeworkDueText = (TextView) convertView.findViewById(R.id.bandText); convertView.setTag(holder); } else { holder = (ViewHolder) convertView.getTag(); } schedule currenthomeworkdue = myschedule.get(position); holder.HomeworkDueText.setText(currenthomeworkdue.band()); return convertView; } } }
这里是为计划定义字符串的地方
public class schedule { private String band; public schedule(String band) { super(); this.band = band; } public String Band() { return band; } }
如果您需要更多信息,请提前询问并感谢您的帮助
我一直试图修复这个错误两天,我的智慧结束了.
private List<homeworkdue> myhomeworkdue = new ArrayList<homeworkdue>();
部分在你的片段中进入onResume,你还需要删除onStart和onStart中的所有内容到onResume.但首先保持这样的声明:
private List<homeworkdue> myhomeworkdue;
并将其余部分移至onResume.
@Override protected void onResume() { // TODO Auto-generated method stub super.onResume(); myhomeworkdue = new ArrayList<homeworkdue>(); populatehomeworkdueList(); populateListView(); registerClickCallBACk(); }
您的第二个ListView中的相同问题,因为它们是相同的.
希望这对你有用.如果有效,请给我一个反馈.
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