我正在开发Android应用程序。该选项卡的视图来自fragments
。因此,我正在从服务器中检索JSON
数据。 JSON
正在AsyncTask
的父视图类中检索fragment
的数据。现在,根据我从服务器检索到的数据,我想相应地更改TextView
内部的fragment
文本。
这是我的fragment layout
:
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MutualFunds"
android:id="@+id/fragment_mutual_funds">
<android.support.constraint.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="@+id/fund_name_bf"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginLeft="16dp"
android:layout_marginTop="28dp"
android:text="@string/mutualfundfrag_iclbf_title"
android:textAppearance="@style/TextAppearance.AppCompat.Large"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="@+id/fund_definition_bf"
android:layout_width="319dp"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginLeft="16dp"
android:layout_marginTop="8dp"
android:text="@string/mutualfundfrag_iclbf_definition"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/fund_name_bf" />
<TextView
android:id="@+id/current_nav_bf"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginLeft="16dp"
android:layout_marginTop="12dp"
android:text="@string/mutualfundfrag_iclbf_current_nav"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/fund_definition_bf" />
<TextView
android:id="@+id/current_return_bf"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginLeft="16dp"
android:layout_marginTop="12dp"
android:text="@string/mutualfundfrag_iclbf_current_return"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/current_nav_bf" />
<TextView
android:id="@+id/fund_performance_bf"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginLeft="16dp"
android:layout_marginTop="12dp"
android:text="@string/mutualfundfrag_iclbf_fund_performance"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/current_return_bf" />
<TextView
android:id="@+id/fund_name_gf"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginLeft="16dp"
android:layout_marginTop="28dp"
android:text="@string/mutualfundfrag_bcbiclgf_title"
android:textAppearance="@style/TextAppearance.AppCompat.Large"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/fund_performance_bf" />
<TextView
android:id="@+id/fund_definition_gf"
android:layout_width="315dp"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginLeft="16dp"
android:layout_marginTop="12dp"
android:text="@string/mutualfundfrag_bcbiclgf_definition"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/fund_name_gf" />
<TextView
android:id="@+id/current_nav_gf"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginLeft="16dp"
android:layout_marginTop="12dp"
android:text="@string/mutualfundfrag_iclbf_current_nav"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/fund_definition_gf" />
<TextView
android:id="@+id/current_return_gf"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginLeft="16dp"
android:layout_marginTop="12dp"
android:text="@string/mutualfundfrag_iclbf_current_return"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/current_nav_gf" />
<TextView
android:id="@+id/fund_performance_gf"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginLeft="16dp"
android:layout_marginTop="12dp"
android:text="@string/mutualfundfrag_iclbf_fund_performance"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/current_return_gf" />
</android.support.constraint.ConstraintLayout>
</FrameLayout>
这是我的fragment activity
班:
package com.testappl.ivest;
import android.content.Context;
import android.net.Uri;
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.TextView;
import com.testappl.ivest.model.FundMaster;
/**
* A simple {@link Fragment} subclass.
* Activities that contain this fragment must implement the
* {@link MutualFunds.OnFragmentInteractionListener} interface
* to handle interaction events.
* Use the {@link MutualFunds#newInstance} factory method to
* create an instance of this fragment.
*/
public class MutualFunds extends Fragment {
// TODO: Rename parameter arguments, choose names that match
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
private static final String ARG_PARAM1 = "param1";
private static final String ARG_PARAM2 = "param2";
// TODO: Rename and change types of parameters
private String mParam1;
private String mParam2;
private static View view;
private OnFragmentInteractionListener mListener;
public MutualFunds() {
// Required empty public constructor
}
/**
* Use this factory method to create a new instance of
* this fragment using the provided parameters.
*
* @param param1 Parameter 1.
* @param param2 Parameter 2.
* @return A new instance of fragment MutualFunds.
*/
// TODO: Rename and change types and number of parameters
public static MutualFunds newInstance(String param1, String param2) {
MutualFunds fragment = new MutualFunds();
Bundle args = new Bundle();
args.putString(ARG_PARAM1, param1);
args.putString(ARG_PARAM2, param2);
fragment.setArguments(args);
return fragment;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
mParam2 = getArguments().getString(ARG_PARAM2);
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
view=inflater.inflate(R.layout.fragment_mutual_funds, container, true);
return inflater.inflate(R.layout.fragment_mutual_funds, container, false);
}
// TODO: Rename method, update argument and hook method into UI event
public void onButtonPressed(Uri uri) {
if (mListener != null) {
mListener.onFragmentInteraction(uri);
}
}
@Override
public void onAttach(Context context) {
super.onAttach(context);
if (context instanceof OnFragmentInteractionListener) {
mListener = (OnFragmentInteractionListener) context;
} else {
throw new RuntimeException(context.toString()
+ " must implement OnFragmentInteractionListener");
}
}
@Override
public void onDetach() {
super.onDetach();
mListener = null;
}
//Change the texts of Balanced Fund
public static void changeBFTexts(FundMaster fm){
TextView mBFLabel=view.findViewById(R.id.fund_name_bf);
TextView mBFDefintion=view.findViewById(R.id.fund_definition_bf);
TextView mBFCurrentNAV=view.findViewById(R.id.current_nav_bf);
TextView mBFCurrentReturn=view.findViewById(R.id.current_return_bf);
mBFLabel.setText(fm.getFundName());
mBFDefintion.setText(fm.getFundDefinition());
}
//Change the texts of Growth Fund
public static void changeGFTexts(FundMaster fm){
TextView mGFLabel=view.findViewById(R.id.fund_name_gf);
TextView mGFDefinition=view.findViewById(R.id.fund_definition_gf);
TextView mGFCurrentNAV=view.findViewById(R.id.current_nav_gf);
TextView mGFCurrentReturn=view.findViewById(R.id.current_return_gf);
mGFLabel.setText(fm.getFundName());
mGFDefinition.setText(fm.getFundDefinition());
}
/**
* This interface must be implemented by activities that contain this
* fragment to allow an interaction in this fragment to be communicated
* to the activity and potentially other fragments contained in that
* activity.
* <p>
* See the Android Training lesson <a href=
* "http://developer.android.com/training/basics/fragments/communicating.html"
* >Communicating with Other Fragments</a> for more information.
*/
public interface OnFragmentInteractionListener {
// TODO: Update argument type and name
void onFragmentInteraction(Uri uri);
}
}
这是我正在检索数据的“家长活动”中的AsyncTask
:
private class JsonTask extends AsyncTask<String, String, String> {
protected void onPreExecute() {
super.onPreExecute();
pd = new ProgressDialog(ICLProducts.this);
pd.setMessage("Please wait");
pd.setCancelable(false);
pd.show();
}
protected String doInBackground(String... params) {
HttpURLConnection connection = null;
BufferedReader reader = null;
try {
URL url = new URL(params[0]);
connection = (HttpURLConnection) url.openConnection();
connection.connect();
InputStream stream = connection.getInputStream();
reader = new BufferedReader(new InputStreamReader(stream));
StringBuffer buffer = new StringBuffer();
String line = "";
while ((line = reader.readLine()) != null) {
buffer.append(line+"\n");
Log.d("Response: ", "> " + line); //here u ll get whole response...... :-)
}
return buffer.toString();
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (connection != null) {
connection.disconnect();
}
try {
if (reader != null) {
reader.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
return null;
}
@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
if (pd.isShowing()){
pd.dismiss();
}
try {
JSONArray resultJsonArray = new JSONArray(result);
ArrayList<FundMaster> fundsData=new ArrayList<FundMaster>();
for(int i=0;i<resultJsonArray.length();i++){
JSONObject jsonObject= (JSONObject) resultJsonArray.get(i);
fundsData.add(new FundMaster(Integer.valueOf(jsonObject.get("f_id").toString()),
Integer.valueOf(jsonObject.get("fund_id").toString()),
jsonObject.get("fund_name").toString(),
jsonObject.get("fund_definition").toString(),
jsonObject.get("fund_date").toString()));
}
for(FundMaster fm:fundsData){
Log.d("Fund Name",fm.getFundName());
Log.d("Fund Launch Date",fm.getFundLaunchDate());
if(fm.getFundId()==1){
MutualFunds.changeBFTexts(fm);
}else if(fm.getFundId()==2){
MutualFunds.changeGFTexts(fm);
}
}
} catch (JSONException e){
Log.e("JSON Error","JSON problem");
}
父活动的布局:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".ICLProducts">
<android.support.design.widget.TabLayout
android:id="@+id/icl_product_page_tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?attr/colorPrimary"
android:elevation="6dp"
android:minHeight="?attr/actionBarSize"
android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
/>
<android.support.v4.view.ViewPager
android:id="@+id/pager"
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:layout_below="@id/icl_product_page_tabs"/>
</RelativeLayout>
预先感谢您的支持。
答案 0 :(得分:0)
请勿使用静态方法。并声明textView为全局。然后,
通过TAG获取片段,该片段在显示片段时已经给出。之后,您可以调用方法。喜欢,
MutualFunds fr = (MutualFunds) getSupportFragmentManager().findFragmentByTag(MutualFunds .class.getName());
if (fr != null) {
fr.changeBFTexts(fm);
}
答案 1 :(得分:0)
根据您的问题,您只想显示接收到的一个记录(这是一个JSONArray)。如果是这样,您应该在活动中有一个方法可以在assyncTask完成后更改片段:
public void changefrag(Fragment frag) {
FragmentManager manager = getSupportFragmentManager();
if (!manager.beginTransaction().isEmpty()) {
manager.beginTransaction().detach(frag);
}
manager.beginTransaction()
.replace(R.id.your_frament_layout_inside_your_activity, frag).commit();
}
在您的jsonTask的onPostExecute方法中,您应该调用它:
@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
if (pd.isShowing()){
pd.dismiss();
}
try {
JSONArray resultJsonArray = new JSONArray(result);
ArrayList<FundMaster> fundsData=new ArrayList<FundMaster>();
for(int i=0;i<resultJsonArray.length();i++){
JSONObject jsonObject= (JSONObject) resultJsonArray.get(i);
fundsData.add(new FundMaster(Integer.valueOf(jsonObject.get("f_id").toString()),
Integer.valueOf(jsonObject.get("fund_id").toString()),
jsonObject.get("fund_name").toString(),
jsonObject.get("fund_definition").toString(),
jsonObject.get("fund_date").toString()));
}
for(FundMaster fm:fundsData){
Log.d("Fund Name",fm.getFundName());
Log.d("Fund Launch Date",fm.getFundLaunchDate());
//change fragment and passe data you want to show to it
changeFrag(MutualFunds.newInstance(fm.getFundName(),fm.getFundLaunchDate());
}
} catch (JSONException e){
Log.e("JSON Error","JSON problem");
}
}
在您创建的片段类中,应该这样做以显示数据:
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
view=inflater.inflate(R.layout.fragment_mutual_funds, container, true);
TextView mBFLabel=view.findViewById(R.id.fund_name_bf);
TextView mBFDefintion=view.findViewById(R.id.fund_definition_bf);
TextView mBFCurrentNAV=view.findViewById(R.id.current_nav_bf);
TextView mBFCurrentReturn=view.findViewById(R.id.current_return_bf);
mBFLabel.setText(mParam1);
mBFDefintion.setText(mParam2);
return inflater.inflate(R.layout.fragment_mutual_funds, container, false);
}
如果您需要显示所有接收到的数据,那么您需要在Fragment中使用recycleView。