我有一个活动页面，其中我有两个片段。 在第一个片段中，有一个列表视图，其主要类别列表具有pulltorefresh功能。
当我点击一个列表项时，它将在第二个片段上显示它的子类别。详细说明它应该如何工作。
但我的问题是，当活动加载第一个片段显示时，以及在Toast中没有显示互联网连接的消息， 但当我点击其列表项时，第二个片段
没有任何问题代码在这里
这是一个有两个片段的活动页面
VARCHAR(XX)第一片段
public class ServiceActivity extends Activity {
CategoryDetails mainCategory;
SimpleSideDrawer slide_me;
public ImageButton imgBack;
static View fragmentsub;
static View fragmentmain;
@SuppressLint("NewApi")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_service);
fragmentmain = findViewById(R.id.fragmentmain);
fragmentsub = findViewById(R.id.fragmentsub);
imgBack = (ImageButton)findViewById(R.id.imgBackBtn);
imgBack.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
finish();
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_service, menu);
return true;
}
}
第二个片段
public class FreagmentMainCategory extends Fragment{
private LinearLayout llLayoutmain;
private FragmentActivity faActivitymain;
private ListView lstCategoryList;
private SelectCategoryTask mAuthTask = null;
private View mServiceStatusView;
CategoryDetails mainCategory;
private categoryListAdapter adapterList;
static final int MENU_MANUAL_REFRESH = 0;
static final int MENU_DISABLE_SCROLL = 1;
static final int MENU_SET_MODE = 2;
static final int MENU_DEMO = 3;
private View lstListView;
private PullToRefreshListView mPullRefreshListView;
@SuppressLint("NewApi")
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
//faActivitymain = (FragmentActivity) super.getActivity();
View view = inflater.inflate(R.layout.activity_fragment_main,container, false);
this.getActivity().getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_HIDDEN);
FontUtils.setCustomFont(getActivity().findViewById(R.id.mainView), getActivity().getAssets());
lstListView= view.findViewById(R.id.lstCategoryView);
mPullRefreshListView = (PullToRefreshListView)view.findViewById(R.id.lstCategory);
// Set a listener to be invoked when the list should be refreshed.
mPullRefreshListView.setOnRefreshListener(new OnRefreshListener<ListView>() {
@Override
public void onRefresh(PullToRefreshBase<ListView> refreshView) {
String label = DateUtils.formatDateTime(getActivity().getApplicationContext(), System.currentTimeMillis(),
DateUtils.FORMAT_SHOW_TIME | DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_ABBREV_ALL);
// Update the LastUpdatedLabel
refreshView.getLoadingLayoutProxy().setLastUpdatedLabel(label);
// Do work to refresh the list here.
new GetDataTask().execute();
}
});
mPullRefreshListView.setOnLastItemVisibleListener(new OnLastItemVisibleListener() {
@Override
public void onLastItemVisible() {
}
});
lstListView=(View)view.findViewById(R.id.lstCategoryView);
lstCategoryList = ((PullToRefreshListView)view.findViewById(R.id.lstCategory)).getRefreshableView();
//lstCategoryList = (ListView) inflater.inflate(R.layout.activity_fragment_main, container, false);
lstCategoryList = mPullRefreshListView.getRefreshableView();
registerForContextMenu(lstCategoryList);
mServiceStatusView = view.findViewById(R.id.service_status);
showProgress(true);
mAuthTask = new SelectCategoryTask();
mAuthTask.execute((Void) null);
lstCategoryList.setOnItemClickListener(new OnItemClickListener(){
public void onItemClick(AdapterView<?> parent, View v, int position,long arg3) {
Fragment fragment = new Fragment();
Bundle bundle = new Bundle();
bundle.putString("MainCategoryName", mainCategory.masterinfo.get(position-1).maincatname);
fragment.setArguments(bundle);
}
});
return view;
}
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getActivity().getMenuInflater().inflate(R.menu.activity_service, menu);
return true;
}
@TargetApi(Build.VERSION_CODES.HONEYCOMB_MR2)
private void showProgress(final boolean show) {
// On Honeycomb MR2 we have the ViewPropertyAnimator APIs, which allow
// for very easy animations. If available, use these APIs to fade-in
// the progress spinner.
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR2) {
int shortAnimTime = getResources().getInteger(
android.R.integer.config_shortAnimTime);
mServiceStatusView.setVisibility(View.VISIBLE);
mServiceStatusView.animate().setDuration(shortAnimTime)
.alpha(show ? 1 : 0)
.setListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
mServiceStatusView.setVisibility(show ? View.VISIBLE
: View.GONE);
}
});
lstListView.setVisibility(View.VISIBLE);
lstListView.animate().setDuration(shortAnimTime)
.alpha(show ? 0 : 1)
.setListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
lstCategoryList.setVisibility(show ? View.GONE
: View.VISIBLE);
}
});
} else {
// The ViewPropertyAnimator APIs are not available, so simply show
// and hide the relevant UI components.
mServiceStatusView.setVisibility(show ? View.VISIBLE : View.GONE);
lstListView.setVisibility(show ? View.GONE : View.VISIBLE);
}
}
public class GetDataTask extends AsyncTask<Void, Void, Boolean> {
@Override
protected Boolean doInBackground(Void... params) {
// Simulates a background job.
ServerAccess sa=new ServerAccess();
mainCategory=sa.GetMainCategory();
return true;
}
@Override
protected void onPostExecute(Boolean result) {
if(mainCategory==null){
Toast.makeText(getActivity().getApplicationContext(), getResources().getString(R.string.error_check_network), Toast.LENGTH_LONG).show();
lstCategoryList.setAdapter(null);
}else if(mainCategory.code.equals("MOB01")){
adapterList=new categoryListAdapter(getActivity().getApplicationContext(), mainCategory.masterinfo);
lstCategoryList.setAdapter(null);
}else if(mainCategory.code.equals("MOB02")){
lstCategoryList.setAdapter(null);
}else{
Toast.makeText(getActivity().getApplicationContext(), getResources().getString(R.string.error_genric_error), Toast.LENGTH_LONG).show();
lstCategoryList.setAdapter(null);
}
// Call onRefreshComplete when the list has been refreshed.
mPullRefreshListView.onRefreshComplete();
super.onPostExecute(result);
}
}
public class SelectCategoryTask extends AsyncTask<Void, Void, Boolean> {
@Override
protected Boolean doInBackground(Void... params) {
ServerAccess sa=new ServerAccess();
mainCategory=sa.GetMainCategory();
return true;
}
@Override
protected void onPostExecute(final Boolean success) {
mAuthTask = null;
showProgress(false);
if(mainCategory==null){
Toast.makeText(getActivity().getApplicationContext(), getResources().getString(R.string.error_check_network), Toast.LENGTH_LONG).show();
lstCategoryList.setAdapter(null);
}else if(mainCategory.code.equals("MOB01")){
adapterList=new categoryListAdapter(getActivity().getApplicationContext(), mainCategory.masterinfo);
lstCategoryList.setAdapter(adapterList);
}else if(mainCategory.code.equals("MOB02")){
lstCategoryList.setAdapter(null);
}else{
Toast.makeText(getActivity().getApplicationContext(), getResources().getString(R.string.error_genric_error), Toast.LENGTH_LONG).show();
lstCategoryList.setAdapter(null);
}
}
@Override
protected void onCancelled() {
mAuthTask = null;
showProgress(false);
}
}
class categoryListAdapter extends BaseAdapter {
List<Category> mainItems;
Context myContext;
public categoryListAdapter(Context context, List<Category> items) {
myContext = context;
mainItems = items;
}
public int getCount() {
return mainItems.size();
}
public Object getItem(int index) {
return mainItems.get(index);
}
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent ) {
// TODO Auto-generated method stub
RelativeLayout layout = new RelativeLayout(myContext);
TextView tv = new TextView(myContext);
tv.setText(mainItems.get(position).maincatname);
tv.setGravity(Gravity.LEFT);
tv.setTextSize(16);
tv.setPadding(20, 20, 0, 20);
tv.setTextColor(myContext.getResources().getColor(R.color.BlackColor));
RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams
(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
lp.addRule(RelativeLayout.ALIGN_PARENT_LEFT);
layout.addView(tv,lp);
return layout;
}
}
}
答案 0 :(得分：1)
在OnItemClickListener中：
Fragment fragment = new Fragment();
Bundle bundle = new Bundle();
bundle.putString("MainCategoryName", mainCategory.masterinfo.get(position-1).maincatname);
fragment.setArguments(bundle);
这不是正确的方法。你需要做的是将数据传输到第二个片段而不是＆＃34; new Fragment＆＃34;。
我认为你可以这样做：
1.将数据传输到ServiceActivity;
2.用第二个片段替换第一个片段，然后用setArguments()将数据传输到第二个片段。
<强>码
1.创建一个这样的回调：
public interface MainfragmentCallBack{
public void showData(String data, int id);
}
2. ServiceActivity实施MainfragmentCallBack并超越showData();
3 showData()中的ServiceActivity：
@Override
public void showData(String data, int id){
//use FragmentTransaction to replace 1st fragment with 2nd fragment
//use setArgument to transfer data
// I do not konw your layout of ServiceActivity,so you can implement it on yourself
}
4，在第一个片段中实例化MainFragmentCallBack，在OnItemClickListener
<强>建议：
在这种情况下，在另一个活动而不是ServiceActivity中显示数据是更好的选择。
答案 1 :(得分：0)
你应该使用回调。 Android团队在此处提供了指南：http://developer.android.com/training/basics/fragments/communicating.html