我有一个主要活动，里面有两个名为task和call的标签。在task中，有一个按钮，当按下时，转到新活动，然后数据进入主活动的viewpager中的任务片段，以填充任务片段中的listview。我已经传递了数据，但它没有动态添加，而且项目被覆盖。
Notifydata setchange也不起作用，我不知道我的错误是什么。你能帮我们帮忙吗？我发布了我的代码：
主要活动在viewpager中包含两个片段：
import android.os.Bundle;
import android.support.design.widget.TabLayout;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
public class MainActivity extends AppCompatActivity {
/**
* The {@link android.support.v4.view.PagerAdapter} that will provide
* fragments for each of the sections. We use a
* {@link 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}.
*/
private SectionsPagerAdapter mSectionsPagerAdapter;
/**
* The {@link ViewPager} that will host the section contents.
*/
private ViewPager mViewPager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
// Create the adapter that will return a fragment for each of the three
// primary sections of the activity.
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
mViewPager = (ViewPager) findViewById(R.id.container);
mViewPager.setAdapter(mSectionsPagerAdapter);
// Bundle bundle=getIntent().getExtras();
// Intent intent=getIntent();
// ActivityView activityView=(ActivityView)intent.getSerializableExtra("yog");
// intent.putExtra("yogs",activityView);
// Bundle bundle=new Bundle();
// bundle.putSerializable("yogs",activityView);
TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(mViewPager);
// intent.getSerializableExtra("god");
/* Bundle bundle=new Bundle();
if(bundle!=null) {
bundle.putSerializable("yog", activityView);
Task task = new Task();
task.setArguments(bundle);
}*/}
@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_main, 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);
}
/**
* A placeholder fragment containing a simple view.
*/
/**
* 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 PlaceholderFragment (defined as a static inner class below).
switch (position){
case 0:
Task task=new Task();
return task;
case 1:
Calls calls=new Calls();
return calls;
}
return null;
}
@Override
public int getCount() {
// Show 3 total pages.
return 2;
}
@Override
public CharSequence getPageTitle(int position) {
switch (position){
case 0:
return "Task";
case 1:
return "Call";
}
return null;
}
}
}
这是视图寻呼机的任务片段，其中列出了listview 细节活动：
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.Button;
import android.widget.ListView;
import java.util.ArrayList;
import java.util.List;
public class Task extends Fragment
{
List<ActivityView>activityViews;
ActivityView activity;
ActivityView activityView=new ActivityView();
ActivityListAdapter activityListAdapter;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootview= inflater.inflate(R.layout.yog,container,false);
ListView listview=(ListView)rootview.findViewById(R.id.listView);
if (activityViews == null)
{
activityViews = new ArrayList<ActivityView>();
}
// Intent intent=getActivity().getIntent();
// ActivityView activityView=(ActivityView) intent.getSerializableExtra("yog");
activityListAdapter = new ActivityListAdapter(getActivity(), R.id.listView, activityViews);
listview.setAdapter(activityListAdapter);
if(activityView!=null)
{
activityViews.add(activityView);
activityListAdapter.notifyDataSetChanged();
}
Button btn=(Button)rootview.findViewById(R.id.button2);
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(getActivity(), DetailActivity.class);
startActivity(intent);
}
});
return rootview;
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if(requestCode==1){
Intent intent=getActivity().getIntent();
activity =(ActivityView) intent.getSerializableExtra("yog");
}
}
}
这是详细信息，其中数据填充任务片段中的listview：
import android.content.Intent;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;
public class DetailActivity extends AppCompatActivity {
ActivityView activityView = new ActivityView();
// public static String endpoint;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_detail);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
final EditText editText = (EditText) findViewById(R.id.editText);
final Spinner spinner = (Spinner) findViewById(R.id.spinner);
final ArrayAdapter<CharSequence> arrayAdapter = ArrayAdapter.createFromResource(getApplicationContext(), R.array.yog, R.layout.support_simple_spinner_dropdown_item);
spinner.setAdapter(arrayAdapter);
final Button btn = (Button) findViewById(R.id.button);
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v)
{
activityView.setDescription(editText.getText().toString());
activityView.setStatus(spinner.getSelectedItem().toString());
Intent intent=new Intent(DetailActivity.this,MainActivity.class);
intent.putExtra("yog",activityView);
intent.putExtra("god",activityView);
startActivityForResult(intent,1);
}
});
}
}
这是我的自定义列表适配器：
import android.content.Context;
import android.graphics.Color;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;
import java.util.List;
/**
* Created by 4264 on 08-01-2016.
*/
public class ActivityListAdapter extends ArrayAdapter<ActivityView> {
private List<ActivityView> listData;
private LayoutInflater layoutInflater;
public ActivityListAdapter(Context context, int resource, List<ActivityView> listdata) {
super(context, resource, listdata);
this.listData = listdata;
layoutInflater = LayoutInflater.from(context);
}
@Override
public void add(ActivityView object)
{
super.add(object);
}
@Override
public int getCount()
{
return listData.size();
}
@Override
public ActivityView getItem(int position)
{
return listData.get(position);
}
@Override
public long getItemId(int position)
{
return position;
}
public View getView(int position, View convertView, ViewGroup parent)
{
ViewHolder comp_list_holder;
View mview = convertView;
if (mview == null) {
convertView = layoutInflater.inflate(R.layout.list_activity, null);
comp_list_holder = new ViewHolder();
comp_list_holder .competitors_name = (TextView) convertView.findViewById(R.id.companygrp);
comp_list_holder .competitors_website = (TextView) convertView.findViewById(R.id.companyname);
convertView.setTag(comp_list_holder );
}
else
{
comp_list_holder = (ViewHolder) convertView.getTag();
}
comp_list_holder.competitors_name.setText("Description " + listData.get(position).getDescription());
comp_list_holder.competitors_website.setText("Status "+ listData.get(position).getStatus());
convertView.setBackgroundColor(Color.parseColor("#DCDCDCDC"));
return convertView;
}
public static class ViewHolder
{
public TextView competitors_name;
public TextView competitors_website;
}
}
答案 0 :(得分：0)
在任务片段中：
Intent intent = new Intent(getActivity(), DetailActivity.class);
startActivityForResult(intent, 1);
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == 1) {
// Make sure the request was successful
if (resultCode == Activity.RESULT_OK){
activityViews.add((ActivityView)data.getParcelableExtra("yog"));
activityListAdapter.notifyDataSetChanged();
}
}
在btn.setOnclickListener中的DetailActivity中：
Intent intent=new Intent();
intent.putExtra("yog",activityView);
intent.putExtra("god",activityView);
setResult(RESULT_OK,intent);
finish();//finishing activity