【发布时间】：2013-05-07 23:35:33
【问题描述】：
我正在尝试用 Parse.com 上的数据库中的对象填充 ListView，但我遇到了麻烦，因为 ListView 不直接接受对象。我尝试通过遍历我的对象并将它们转换为字符串来制作一个字符串数组，但失败了。我也尝试在对象上调用 .toString ，但也没有运气。
我的计划是遍历所有解析对象，然后将它们添加到 ListView。然后，该 ListView 将用于允许用户搜索 Parse.com 中的所有对象。 Parse.com 中的对象应替换 listview_array[] 数据....例如替换“BudWeiser”、“Dubra”等....
我创建的用于检索对象名称、价格、大小的循环确实有效，但我无法将它放入 listView，因为我相信它是一个对象。
这是我的代码
package com.alpha.dealtap;
import java.lang.reflect.Array;
import java.util.List;
import java.util.ArrayList;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.Log;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import com.parse.FindCallback;
import com.parse.Parse;
import com.parse.ParseException;
import com.parse.ParseObject;
import com.parse.ParseQuery;
public class Search_Page extends Activity {
private ListView lv;
private EditText et;
public String listview_array[] = { "BudWeiser", "Dubra", "Corona",
"Jack Daniels", "Smirnoff", "Keystone Light", "Natural Ice" };
private ArrayList<String> array_sort = new ArrayList<String>();
public ArrayList<Object> _arrayList = new ArrayList<Object>();
int textlength = 0;
ParseObject dealsObject;
int n = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.search_page);
Parse.initialize(this, "vUz23Z6zdIL1jbxbVWeLpsSdu1ClTu3YiG30zTWY",
"4BTyoq1QQKows8qVJV7lvU3ZokSRrLFyOCPzffwJ");
// Using this Parsequery...I can grab/locate the objects from the Parse
// list...Here I grabbed the objects that have Burnettes and the price
// of it
// Eventually I may need to set a limit on how many results I will get
// from the for loop....So far I think it is limited to 100 by default
ParseQuery query = new ParseQuery("Deals");
// query.whereEqualTo("Brand", "Burnettes");
query.findInBackground(new FindCallback() {
@Override
public void done(List<ParseObject> objects, ParseException e) {
if (e == null) {
Log.d("Brand", "Retrieved " + objects.size() + " Brands");
for (ParseObject dealsObject : objects) {
// use dealsObject.get('columnName') to access the
// properties of the Deals object
Object brands = dealsObject.get("Brand").toString();
_arrayList.add(brands);
listview_array = _arrayList;
//Having trouble putting strings into an array list....Have to cast as ArrayList and then it causes error!
Log.d("Size", (String) dealsObject.get("Size"));
Log.d("Price", (String) dealsObject.get("Price"));
Log.d("Brand", (String) dealsObject.get("Brand"));
n++;
}
} else {
Log.d("Brand", "Error: " + e.getMessage());
}
}
});
Button store = (Button) findViewById(R.id.b1);
Button deal = (Button) findViewById(R.id.b2);
lv = (ListView) findViewById(R.id.ListView01);
et = (EditText) findViewById(R.id.search_box);
lv.setAdapter(new ArrayAdapter<Object>(this,
android.R.layout.simple_list_item_1, listview_array));
et.addTextChangedListener(new TextWatcher() {
public void afterTextChanged(Editable s) {
// Abstract Method of TextWatcher Interface.
}
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
// Abstract Method of TextWatcher Interface.
}
public void onTextChanged(CharSequence s, int start, int before,
int count) {
textlength = et.getText().length();
array_sort.clear();
for (int i = 0; i < listview_array.length; i++) {
if (textlength <= listview_array[i].length()) {
if (et.getText()
.toString()
.equalsIgnoreCase(
(String) listview_array[i].subSequence(
0, textlength))) {
array_sort.add(listview_array[i]);
}
}
}
lv.setAdapter(new ArrayAdapter<String>(Search_Page.this,
android.R.layout.simple_list_item_1, array_sort));
}
});
store.setOnClickListener(new View.OnClickListener() {
// When you use OnClickListener...you need the onClick method inside
// of it
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
startActivity(new Intent("com.alpha.dealtap.STOREPAGE"));
}
});
deal.setOnClickListener(new View.OnClickListener() {
// When you use OnClickListener...you need the onClick method inside
// of it
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
startActivity(new Intent("com.alpha.dealtap.DEALPAGE"));
}
});
}
protected void onListItemClick(ListView l, View v, int position, long id) {
// Cheese equals the position for which item that is clicked...so it
// depends on which item that is clicked
String cheese = "TAPDEAL";
try {
Class ourClass = Class.forName("com.alpha.dealtap." + cheese);
Intent ourIntent = new Intent(Search_Page.this, ourClass);
startActivity(ourIntent);
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
@Override
protected void onPause() {
super.onPause();
}
【问题讨论】：
标签： java android arrays listview object