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我想解析來自在線源的JSON數據。我使用了調試，並看到JSON數據正好返回到活動。但是，當我運行應用程序時，應該顯示此數據的活動，它顯示爲空白。我想如果我用這些數據誇大名單有什麼問題。JSON數組返回數據，但不能設置爲佈局
我使用的教程是：http://www.androidhive.info/2012/01/android-json-parsing-tutorial/
請幫我解決這個問題。
下面是活動代碼：
package com.plusworks.appdev.youcancook;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.FrameLayout;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.TextView;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
import java.util.HashMap;
public class CuisineDishes extends BaseActivity {
private ProgressDialog pDialog;
ListView dishList;
ArrayList<HashMap<String,String>> cuisineDishList;
private static String url = "http://youcancook.site90.com/amdishes.json";
JSONArray dishes=null;
private static final String ARRAY_DISHES="americandishes";
private static final String ID="id";
private static final String NAME="name";
private static final String SHORTDESC="shortdesc";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
FrameLayout fl = (FrameLayout) findViewById(R.id.main_content);
LayoutInflater inflater = (LayoutInflater) this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View contentView = inflater.inflate(R.layout.activity_cuisine_dishes, null, false);
fl.addView(contentView);
Intent mIntent = getIntent();
String cuisineName = mIntent.getStringExtra("CuisineName");
getSupportActionBar().setTitle(cuisineName + " Dishes");
cuisineDishList=new ArrayList<>();
dishList = (ListView) findViewById(R.id.dish_list);
new AsyncDishModel().execute();
}
private class AsyncDishModel extends AsyncTask<Void,Void,Void>{
@Override
protected void onPreExecute() {
super.onPreExecute();
// Showing progress dialog
pDialog=new ProgressDialog(CuisineDishes.this);
pDialog.setMessage("Fetching dishes...");
pDialog.setCancelable(false);
pDialog.show();
}
@Override
protected Void doInBackground(Void... params) {
ServiceHandler sh=new ServiceHandler();
String jsonStr=sh.makeServiceCall(url, ServiceHandler.GET);
if(jsonStr!=null){
try{
JSONObject jObject=new JSONObject(jsonStr);
dishes=jObject.getJSONArray(ARRAY_DISHES);
for(int i=0;i<dishes.length();i++){
JSONObject c=dishes.getJSONObject(i);
String id=c.getString(ID);
String name=c.getString(NAME);
String shortdesc=c.getString(SHORTDESC);
HashMap<String,String> templist=new HashMap<String,String>();
templist.put(ID,id);
templist.put(NAME,name);
templist.put(SHORTDESC,shortdesc);
cuisineDishList.add(templist);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
return null;
}
@Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
// Dismiss the progress dialog
if (pDialog.isShowing())
pDialog.dismiss();
/**
* Updating parsed JSON data into ListView
* */
ListAdapter adapter = new SimpleAdapter(
CuisineDishes.this, cuisineDishList,
R.layout.cuisine_dish_list_item, new String[] {ID,NAME,
SHORTDESC}, new int[]{ R.id.mId,R.id.title_dish,
R.id.desc_dish});
dishList.setAdapter(adapter);
}
}
@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_cuisine_dishes, 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);
}
}
服務處理器是一樣的，在教程中給出。
這裏是我的活動佈局代碼：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.plusworks.appdev.youcancook.CuisineDishes">
<ListView
android:id="@+id/dish_list"
android:layout_width="fill_parent"
android:layout_height="wrap_content"></ListView>
</RelativeLayout>
這裏是cuisine_dish_list_item.xml代碼
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:padding="10dp"
android:paddingLeft="10dp"
android:paddingRight="10dp">
<TextView
android:id="@+id/title_dish"
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:text="Title"
android:textSize="30dp" />
<TextView
android:id="@+id/desc_dish"
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:text="Short Description"
android:textSize="20dp" />
<TextView
android:id="@+id/mId"
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:text="ID"
android:visibility="invisible" />
</LinearLayout>