Android:使用ListView时在活动之间传递数据的最佳方式
我有一个名为Android:使用ListView时在活动之间传递数据的最佳方式,android,android-listview,android-activity,Android,Android Listview,Android Activity,我有一个名为SearchActivity的活动,它有一个ListView,其中包含JSON下载的数据子集(标题和距离)。我想在另一个名为ResultsActivity的活动中显示所有JSON数据和完整记录。我知道如何从列表视图本身获取数据并将其传递给其他活动,但我不知道如何获取所有要传递给第二个活动的数据 例如,我希望onClickListener对当前选定项的ArrayList进行查找,以便执行以下操作: in.putExtra(标签名称、名称); in.putExtra(塔古街,街); ec
SearchActivity
的活动,它有一个ListView
,其中包含JSON下载的数据子集(标题和距离)。我想在另一个名为ResultsActivity
的活动中显示所有JSON数据和完整记录。我知道如何从列表视图
本身获取数据并将其传递给其他活动,但我不知道如何获取所有要传递给第二个活动的数据
例如,我希望onClickListener对当前选定项的ArrayList进行查找,以便执行以下操作:
in.putExtra(标签名称、名称);
in.putExtra(塔古街,街);
ect
问题在于ListView中显示的唯一内容是名称和距离。如何使用当前的Listview选择获取ArrayList条目,以便显示例如街道
谢谢你的帮助
SearchActivity.java
package com.chance.squat;
import com.chance.squat.R;
import java.util.ArrayList;
import java.util.HashMap;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.Activity;
import android.app.ListActivity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ImageView;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.TextView;
public class SearchActivity extends ListActivity {
// url to make request
private static String url = "http://192.168.1.115:3000/bathrooms/nearby.json/?lat=45.580639&lon=-122.677682";
// JSON Node names
private static final String TAG_BATHROOMS = "bathrooms";
private static final String TAG_ID = "ID";
private static final String TAG_ACCESS = "access";
private static final String TAG_CITY = "city";
private static final String TAG_COMMENT = "comment";
private static final String TAG_DIRECTIONS = "directions";
private static final String TAG_NAME = "name";
private static final String TAG_STREET = "street";
private static final String TAG_BATHROOMTYPE = "bathroomtype";
private static final String TAG_DISTANCE = "distance";
private static final String TAG_AVAIL = "avail";
private static final String TAG_COUNTRY = "country";
private static final String TAG_STATE = "state";
private static final String TAG_POSTAL = "postal";
// contacts JSONArray
JSONArray bathrooms = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_search);
// Hashmap for ListView
ArrayList<HashMap<String, String>> bathroomList = new ArrayList<HashMap<String, String>>();
// Creating JSON Parser instance
JSONParser jParser = new JSONParser();
// getting JSON string from URL
JSONObject json = jParser.getJSONFromUrl(url);
try {
// Getting Array of Contacts
bathrooms = json.getJSONArray(TAG_BATHROOMS);
// looping through All Contacts
for(int i = 0; i < bathrooms.length(); i++){
JSONObject c = bathrooms.getJSONObject(i);
// Storing each json item in variable
String id = c.getString(TAG_ID);
String access = c.getString(TAG_ACCESS);
String city = c.getString(TAG_CITY);
String comment = c.getString(TAG_COMMENT);
String directions = c.getString(TAG_DIRECTIONS);
String name = c.getString(TAG_NAME);
String street = c.getString(TAG_STREET);
String bathroomtype = c.getString(TAG_BATHROOMTYPE);
String distance = c.getString(TAG_DISTANCE);
String distanceTrimmed = distance.substring(0,4) + " " + "miles away";
String avail = c.getString(TAG_AVAIL);
String country = c.getString(TAG_COUNTRY);
String state = c.getString(TAG_STATE);
String postal = c.getString(TAG_POSTAL);
System.out.println(name);
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
// adding each child node to HashMap key => value
map.put(TAG_ID, id);
map.put(TAG_ACCESS, access);
map.put(TAG_CITY, city);
map.put(TAG_COMMENT, comment);
map.put(TAG_DIRECTIONS, directions);
map.put(TAG_NAME, name);
map.put(TAG_STREET, street);
map.put(TAG_BATHROOMTYPE, bathroomtype);
map.put(TAG_DISTANCE, distanceTrimmed);
map.put(TAG_AVAIL, avail);
map.put(TAG_COUNTRY, country);
map.put(TAG_STATE, state);
map.put(TAG_POSTAL, postal);
// adding HashList to ArrayList
bathroomList.add(map);
}
} catch (JSONException e) {
e.printStackTrace();
}
/**
* Updating parsed JSON data into ListView
* */
ListAdapter adapter = new SimpleAdapter(this, bathroomList,
R.layout.list_item,
new String[] { TAG_NAME, TAG_DISTANCE}, new int[] {
R.id.name, R.id.distance });
setListAdapter(adapter);
// selecting single ListView item
ListView lv = getListView();
// Launching new screen on Selecting Single ListItem
lv.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// getting values from selected ListItem
//String name = ((TextView) view.findViewById(R.id.name)).getText().toString();
//String distance = ((TextView) view.findViewById(R.id.distance)).getText().toString();
// Starting new intent
//Intent in = new Intent(getApplicationContext(), SeachActivity.class);
//in.putExtra(TAG_NAME, name);
//in.putExtra(TAG_DISTANCE, distance);
//startActivity(in);
}
});
}
}
SearchActivity.java
package com.chance.buck;
导入com.chance.shub.R;
导入java.util.ArrayList;
导入java.util.HashMap;
导入org.json.JSONArray;
导入org.json.JSONException;
导入org.json.JSONObject;
导入android.app.Activity;
导入android.app.ListActivity;
导入android.content.Intent;
导入android.os.Bundle;
导入android.util.Log;
导入android.view.view;
导入android.widget.AdapterView;
导入android.widget.AdapterView.OnItemClickListener;
导入android.widget.ImageView;
导入android.widget.ListAdapter;
导入android.widget.ListView;
导入android.widget.simpledapter;
导入android.widget.TextView;
公共类SearchActivity扩展了ListActivity{
//发出请求的url
专用静态字符串url=”http://192.168.1.115:3000/bathrooms/nearby.json/?lat=45.580639&lon=-122.677682";
//JSON节点名称
私人静态最终字符串TAG_BATHROOMS=“BATHROOMS”;
私有静态最终字符串标记\u ID=“ID”;
私有静态最终字符串标记_ACCESS=“ACCESS”;
私有静态最终字符串TAG_CITY=“CITY”;
私有静态最终字符串标记_COMMENT=“COMMENT”;
私有静态最终字符串标记_DIRECTIONS=“DIRECTIONS”;
私有静态最终字符串标记_NAME=“NAME”;
私有静态最终字符串TAG_STREET=“STREET”;
专用静态最终字符串TAG_BATHROOMTYPE=“BATHROOMTYPE”;
私有静态最终字符串标记_DISTANCE=“DISTANCE”;
专用静态最终字符串标记\u AVAIL=“AVAIL”;
私有静态最终字符串标记_COUNTRY=“COUNTRY”;
私有静态最终字符串标记_STATE=“STATE”;
私有静态最终字符串标记\u POSTAL=“POSTAL”;
//联系JSONArray
JSONArray浴室=空;
@凌驾
创建时的公共void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity\u search);
//ListView的Hashmap
ArrayList bathroomList=新建ArrayList();
//创建JSON解析器实例
JSONParser jParser=新的JSONParser();
//从URL获取JSON字符串
JSONObject json=jParser.getJSONFromUrl(url);
试一试{
//获取联系人数组
bathrooms=json.getJSONArray(TAG_bathrooms);
//通过所有触点循环
对于(int i=0;ivalue
地图放置(标签标识,标识);
地图放置(标签访问,访问);
地图放置(TAG_市,城市);
地图放置(标签注释,注释);
地图放置(标记方向、方向);
地图放置(标签名称、名称);
地图放置(塔古街,街道);
地图放置(TAG_浴室类型,浴室类型);
地图放置(标记距离、距离修剪);
地图放置(TAG_AVAIL,AVAIL);
地图放置(标记国家,国家);
地图放置(标记状态,状态);
地图放置(TAG_POSTAL,POSTAL);
//将哈希列表添加到ArrayList
浴室列表。添加(地图);
}
}捕获(JSONException e){
e、 printStackTrace();
}
/**
*将解析的JSON数据更新到ListView中
* */
ListAdapter=new SimpleAdapter(此为浴室列表,
R.layout.list_项目,
新字符串[]{TAG_NAME,TAG_DISTANCE},新int[]{
R.id.name,R.id.distance});
setListAdapter(适配器);
//选择单个ListView项
ListView lv=getListView();
//在选择单个列表项时启动新屏幕
lv.setOnItemClickListener(新的OnItemClickListener(){
@凌驾
public void onItemClick(AdapterView父级、视图、,
内部位置,长id){
//从所选Lis获取值
lv.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// getting values from selected ListItem
ArrayList<HashMap<String, String>> arrhashmap=
(ArrayList<HashMap<String, String>>) lv.getItemAtPosition(position);
// Starting new intent
Intent in = new Intent(getApplicationContext(), SeachActivity.class);
in.putExtra("arralsthasmap", arrhashmap);
startActivity(in);
ArrayList<HashMap<String, String>> arrhashmap
=(ArrayList<HashMap<String, String>>)
getIntent().getSerializableExtra("arralsthasmap");