我已经尝试了大约 2 周来尝试将 ArrayList 加载到微调器。从以下代码中注释掉的尝试中可以看出，我运气不佳。我在代码中留下了注释来告诉你我已经尝试了数百种方法来做到这一点。我可以将数据发送到微调器，但它没有正确显示。我试图获取密钥：从 hashmap 中获取数据，将 arraylist 加载到微调器，从 arraylist 中获取对象等等。我不太擅长 Java/Android，但擅长 VB。我一直在努力使用Android。我将不胜感激在这个问题上的一些帮助。先感谢您。再次感谢。
我尝试上传一张图片，但我的代表为 1。所以，这就是我得到的：
THIS IS THE RESPONSE:
{"category":"Accessories"}
{"category":"Battery Packs"}
{"category":"Hunting Lights"}
{"category":"Other"}
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.NameValuePair;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.Activity;
import android.app.ProgressDialog;
import android.os.AsyncTask;
import android.os.Bundle;
import android.provider.SyncStateContract.Constants;
import android.util.Log;
import android.view.Menu;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
public class Shop extends Activity {
//PHP to get catagories
public static String url_to_send = "http://xxx.xxx.xxx.xxx/load_catagories.php";
//TAG to send to PHP to retrieve catagories
private static final String TAG_CATAGORIES= "catagories";
private static final String TAG_CATAGORY= "catagory";
//Success tag
private static final String TAG_SUCCESS = "success";
//Dialog
ProgressDialog pDialog;
//JSON Parser
JSONParser jParser = new JSONParser();
JSONArray catagories = null;
Spinner MySpinner;
ArrayList<HashMap<String, String>> catagoryList;
List<String> items;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_shop);
MySpinner = (Spinner)findViewById(R.id.spinner1);
// Hashmap for ListView
catagoryList = new ArrayList<HashMap<String, String>>();
new LoadAllProducts().execute();
}
String theCatagory;
class LoadAllProducts extends AsyncTask<String, String, String> {
/**
* Before starting background thread Show Progress Dialog
* */
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(Shop.this);
pDialog.setMessage("Loading Catagories. Please wait...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.show();
}
/**
* getting All products from url
* */
protected String doInBackground(String... args) {
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
// getting JSON string from URL
JSONObject json = jParser.makeHttpRequest(url_to_send, "GET", params);
// Check your log cat for JSON reponse
Log.d("All Catagories: ", json.toString());
try {
// Checking for SUCCESS TAG
int success = json.getInt(TAG_SUCCESS);
if (success == 1) {
// products found
// Getting Array of Products
catagories = json.getJSONArray(TAG_CATAGORIES);
// looping through All Products
items = new ArrayList<String>();
for (int i = 0; i < catagories.length(); i++) {
JSONObject c = catagories.getJSONObject(i);
items.add(catagories.getString(i));
// Storing each json item in variable
theCatagory = c.getString(TAG_CATAGORY);
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
// adding each child node to HashMap key => value
map.put(TAG_CATAGORY, theCatagory);
// adding HashList to ArrayList
catagoryList.add(map);
}
} else {
// no products found
// Launch Add New product Activity
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
/**
* After completing background task Dismiss the progress dialog
* **/
protected void onPostExecute(String file_url) {
// dismiss the dialog after getting all products
pDialog.dismiss();
// updating UI from Background Thread
runOnUiThread(new Runnable() {
public void run() {
/**
* Updating parsed JSON data into ListView
* */
// ListAdapter adapter = new SimpleAdapter(MainActivity.this, productsList,R.layout.list_item, new String[] { TAG_PID,TAG_NAME},new int[] { R.id.pid, R.id.name });
//setListAdapter(adapter);
//ListAdapter adapter=new LazyAdapter(Shop.this, catagoryList);
//list.setAdapter(adapter);
//setListAdapter(adapter);
//String[] myData = {};
// myData = catagoryList.toArray(new String[catagoryList.size()]);
// SimpleAdapter adapter = new SimpleAdapter(Shop.this, catagoryList,R.layout.list_item, new String[] { TAG_CATAGORY},new int[] { theCatagory });
// MySpinner.setAdapter(adapter);
//ArrayAdapter<String> adapter = new ArrayAdapter<String> (Shop.this, android.R.layout.simple_spinner_item, catagoryList);
// MySpinner.setAdapter(adapter);
//ArrayList<String> list=new ArrayList<String>();
//for(int i=0;i<catagories.length();i++)
//{
//try {
//list.add(catagories.getString(i));
//} catch (JSONException e) {
// TODO Auto-generated catch block
// e.printStackTrace();
//}
// }
String [] anArrayOfStrings = new String[theCatagory.length()];
items.toArray(anArrayOfStrings);
ArrayAdapter<String>spinnerMenu = new ArrayAdapter<String(Shop.this,android.R.layout.simple_list_item_1,anArrayOfStrings);
MySpinner.setAdapter(spinnerMenu);
}
});
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.shop, menu);
return true;
}
}
这是所有类别：LogCat
06-13 10:50:59.120: D/All Catagories:(5329): {"success":1,"catagories":[{"catagory":"Accessories"},{"catagory":"Battery Packs"},{"catagory":"Hunting Lights"}]}