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listview，具有主类别列表和pulltorefresh功能。
当我点击一个列表项，它将显示它的第二个片段的子类别。这就是它应该做的。
但我的问题是，当活动加载第一个片段显示，也没有互联网连接的消息显示在一个吐司，但是当我点击它的列表项时第二个片段
没有任何变化代码在这里
这个是activity页面有两个fragment
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;
}
1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;
}
}
}
第二片段
public class FragmentSubCategory extends Fragment{
private View mSubCategoryStatusView;
private subCategoryListAdapter subAdapterList;
private SelectSubCategoryTask mSubAuthTask = null;
private ExpandableListView lstSubCategoryList;
String MainCategoryId="-1",MainCategoryName;
SubCategoryDetails mainSubCategory;
@SuppressLint("NewApi")
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
this.getActivity().getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_HIDDEN);
FontUtils.setCustomFont(getActivity().findViewById(R.id.subfragment), getActivity().getAssets());
View view = inflater.inflate(R.layout.activity_fragment_sub,container, false);
lstSubCategoryList = (ExpandableListView)view.findViewById(R.id.lstSubCategory);
mSubCategoryStatusView = view.findViewById(R.id.sub_category_status);
Bundle bundle = getArguments();
try{
MainCategoryName = bundle.getString("MainCategoryName");
}catch(Exception ex){
MainCategoryName="";
}
try{
MainCategoryId = bundle.getString("MainCategoryId");
}catch(Exception ex){
MainCategoryId="-1";
}
lstSubCategoryList.setOnChildClickListener(new OnChildClickListener() {
@Override
public boolean onChildClick(ExpandableListView parent, View v,
int groupPosition, int childPosition, long id) {
Intent vendorListIntent=new Intent(getActivity().getApplication(),VendorListByCategoryActivity.class);
vendorListIntent.putExtra("typeid", mainSubCategory.masterinfo.get(groupPosition).type.get(childPosition).typeid);
vendorListIntent.putExtra("subCategoryId", mainSubCategory.masterinfo.get(groupPosition).subcatid);
vendorListIntent.putExtra("mainCategoryId", MainCategoryId);
startActivity(vendorListIntent);
return false;
}
});
showSubCategoryProgress(true);
mSubAuthTask = new SelectSubCategoryTask();
mSubAuthTask.execute((Void) null);
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_sub_category, menu);
return true;
}
@TargetApi(Build.VERSION_CODES.HONEYCOMB_MR2)
private void showSubCategoryProgress(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);
mSubCategoryStatusView.setVisibility(View.VISIBLE);
mSubCategoryStatusView.animate().setDuration(shortAnimTime)
.alpha(show ? 1 : 0)
.setListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
mSubCategoryStatusView.setVisibility(show ? View.VISIBLE
: View.GONE);
}
});
lstSubCategoryList.setVisibility(View.VISIBLE);
lstSubCategoryList.animate().setDuration(shortAnimTime)
.alpha(show ? 0 : 1)
.setListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
lstSubCategoryList.setVisibility(show ? View.GONE
: View.VISIBLE);
}
});
} else {
// The ViewPropertyAnimator APIs are not available, so simply show
// and hide the relevant UI components.
mSubCategoryStatusView.setVisibility(show ? View.VISIBLE : View.GONE);
lstSubCategoryList.setVisibility(show ? View.GONE : View.VISIBLE);
}
}
public class SelectSubCategoryTask extends AsyncTask<Void, Void, Boolean> {
@Override
protected Boolean doInBackground(Void... params) {
ServerAccess sa=new ServerAccess();
mainSubCategory=sa.GetTypesMasters(Integer.parseInt(MainCategoryId));
return true;
}
@Override
protected void onPostExecute(final Boolean success) {
mSubAuthTask = null;
if(mainSubCategory==null){
showSubCategoryProgress(false);
Toast.makeText(getActivity().getApplicationContext(), getResources().getString(R.string.error_check_network), Toast.LENGTH_LONG).show();
//Message no category found.
}else if(mainSubCategory.code.equals("MOB02")){
showSubCategoryProgress(false);
Toast.makeText(getActivity().getApplicationContext(), mainSubCategory.msg, Toast.LENGTH_LONG).show();
}else if(mainSubCategory.code.equals("MOB01")){
showSubCategoryProgress(false);
subAdapterList=new subCategoryListAdapter(getActivity().getApplicationContext(), mainSubCategory.masterinfo);
lstSubCategoryList.setAdapter(subAdapterList);
//set adapter
}else{
showSubCategoryProgress(false);
Toast.makeText(getActivity().getApplicationContext(), getResources().getString(R.string.error_genric_error), Toast.LENGTH_LONG).show();
//No Category message
}
}
@Override
protected void onCancelled() {
mSubAuthTask = null;
showSubCategoryProgress(false);
}
}
public class subCategoryListAdapter extends BaseExpandableListAdapter {
private Context myContext;
private List<SubCategory> _listDataHeader; // header titles
// child data in format of header title, child title
public subCategoryListAdapter(Context context, List<SubCategory> listDataHeader) {
this.myContext = context;
this._listDataHeader = listDataHeader;
}
@Override
public Object getChild(int groupPosition, int childPosititon) {
return this._listDataHeader.get(groupPosition).type.get(childPosititon).typename;
}
@Override
public long getChildId(int groupPosition, int childPosition) {
return childPosition;
}
@Override
public View getChildView(int groupPosition, final int childPosition,
boolean isLastChild, View convertView, ViewGroup parent) {
final String childText = (String) getChild(groupPosition, childPosition);
RelativeLayout layout = new RelativeLayout(myContext);
TextView txtListChild = new TextView(myContext);
txtListChild.setText(childText);
txtListChild.setGravity(Gravity.LEFT);
txtListChild.setTextSize(16);
txtListChild.setPadding(60, 20, 0, 20);
txtListChild.setTextColor(myContext.getResources().getColor(R.color.BlackColor));
layout.addView(txtListChild);
return layout;
}
@Override
public int getChildrenCount(int groupPosition) {
return this._listDataHeader.get(groupPosition).type.size();
}
@Override
public Object getGroup(int groupPosition) {
return this._listDataHeader.get(groupPosition).subcatname;
}
@Override
public int getGroupCount() {
return this._listDataHeader.size();
}
@Override
public long getGroupId(int groupPosition) {
return groupPosition;
}
@Override
public View getGroupView(int groupPosition, boolean isExpanded,
View convertView, ViewGroup parent) {
String headerTitle = (String) getGroup(groupPosition);
int noOfType= getChildrenCount(groupPosition);
RelativeLayout layout = new RelativeLayout(myContext);
TextView lblListHeader = new TextView(myContext);
lblListHeader.setText(headerTitle.toUpperCase());
lblListHeader.setGravity(Gravity.LEFT);
lblListHeader.setTextSize(18);
lblListHeader.setPadding(50, 20, 0, 20);
lblListHeader.setTextColor(myContext.getResources().getColor(R.color.BlackColor));
layout.addView(lblListHeader);
RelativeLayout.LayoutParams noOfTypesLp = new RelativeLayout.LayoutParams
(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
noOfTypesLp.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);
TextView txtNoOfType = new TextView(myContext);
txtNoOfType.setText(String.valueOf(noOfType));
txtNoOfType.setTextSize(16);
txtNoOfType.setPadding(0, 20, 20, 20);
txtNoOfType.setTextColor(myContext.getResources().getColor(R.color.BlackColor));
layout.addView(txtNoOfType,noOfTypesLp);
return layout;
}
@Override
public boolean hasStableIds() {
return false;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
return true;
}
}
}
在你的OnItemClickListener:
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"新片段"。
我认为你可以这样做:1.将数据传输到ServiceActivity;2.用第2段替换第1段，setArguments()将数据传输到第2段。
代码:
1. 创建一个这样的回调:
public interface MainfragmentCallBack{
public void showData(String data, int id);
}
2。ServiceActivity实现MainfragmentCallBack并超越showData();
3, showData() in 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，实例化MainFragmentCallBack在第一个片段，使用它在OnItemClickListener
建议:
在这种情况下，在另一个活动中显示数据而不是在ServiceActivity中显示数据是更好的选择。
应该使用回调。Android团队在这里有一个指南:http://developer.android.com/training/basics/fragments/communicating.html