如何从列表视图android的价值？ [英] How to get values from listview android?
本文介绍了如何从列表视图android的价值？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我在android.I新我从MySQL中获取数据并显示在listview.things它工作正常，但现在我想的值传递给意向时列表视图（行）的用户点击。我已经实现setOnItemClickListener.but列表视图是动态的，所以我没有得到如何得到的值，并将它传递给意向。
在此先感谢
公共类AdminNotice延伸活动{ 私有String [] navMenuTitles;
私人TypedArray navMenuIcons;
私人的EditText editTextName;
共享preferences SP;
私人字符串jsonResult;
私人的ListView ListView的;
私人键b;
的EditText etname等;
TextView的电视;
串myJSON;
私有静态最后弦乐TAG =MainActivity.java;
私有静态最后弦乐TAG_NAME =通知;
私有静态最后弦乐TAG_DATE =ndate;
进度进度;
日期日期;
JSONArray人民= NULL; ArrayList的＆LT;＆HashMap的LT;字符串，字符串＆GT;＆GT; personList; ListView控件列表; 公共静态最后弦乐USER_NAME =USERNAME; @覆盖
保护无效的onCreate（捆绑savedInstanceState）{
super.onCreate（savedInstanceState）;
的setContentView（R.layout.noticelist）;
进度=（进度）findViewById（R.id.progressbar）;
//共享preferences我的preFS = getShared preferences（用户，MODE_WORLD_READABLE）;
//字符串SESSION_ID =我的prefs.getString（SESSION_ID，NULL）;
// TextView中的TextView =（的TextView）findViewById（R.id.fname）; //textView.setText(\"Welcome+ SESSION_ID）; navMenuTitles = getResources（）getStringArray（R.array.nav_drawer_items）。 navMenuIcons = getResources（）obtainTypedArray（R.array.nav_drawer_icons）。
从//加载图标
//的strings.xml
名单=（ListView控件）findViewById（R.id.listView）;
personList =新的ArrayList＆LT;＆HashMap的LT;字符串，字符串＆GT;＆GT;（）; 的getData（）;
} //发送信息停止 //获取JSON数据开始
保护无效showList（）{
尝试{
JSONArray人民=新JSONArray（myJSON）;
的for（int i = 0; I＆LT; peoples.length（）;我++）{
JSONObject的C = peoples.getJSONObject（I）
字符串名称= NULL，日期= NULL; / *如果（C == NULL）{
ProgressDialog进度=新ProgressDialog（本）;
progress.setTitle（加载）;
progress.setMessage（稍等...）;
progress.show（）;
} * / 如果（c.has（通知））
如果（c.has（ndate））
progressBar.setVisibility（View.GONE）;
名称= c.getString（通知）;
日期= c.getString（ndate）;
HashMap的＆LT;字符串，字符串＆GT;人=新的HashMap＆LT;字符串，字符串＆GT;（）;
persons.put（TAG_NAME，名）;
persons.put（TAG_DATE，日期）;
personList.add（人）;
} ListAdapter适配器=新SimpleAdapter（
AdminNotice.this，personList，R.layout.list_item1，
新的String [] {TAG_NAME，TAG_DATE}，
新的INT [] {R.id.name，R.id.date}
）; list.setAdapter（适配器）; list.setOnItemClickListener（新AdapterView.OnItemClickListener（）{ @覆盖
公共无效onItemClick（适配器视图＆LT;＆GT;适配器视图，视图观点，INT位置，
长ID）{ / * ModelClass OBJ =的getItem（位置）;
字符串名称= obj.getName（）; * /
//简单敬酒，显示位置选择
Log.d（SELECT_POSITION，位置这个列表项目=+位置）;
} }）; / * list.setOnItemClickListener（新AdapterView.OnItemClickListener（）{ 公共无效onItemClick（适配器视图父母，观景，INT位置，长的id）{
Toast.makeText（getApplicationContext（），（（TextView的）视图）.getText（），Toast.LENGTH_SHORT）.show（）; } }）; * / }赶上（JSONException E）{
Log.i（tagconvertstr，[+ myJSON +]）;
}
} 公共无效的getData（）{
类GetDataJSON扩展的AsyncTask＆LT;弦乐，太虚，字符串＆GT; {
@覆盖
保护字符串doInBackground（字符串... PARAMS）{ 共享preferences我的preFS = getShared preferences（用户，MODE_WORLD_READABLE）;
字符串的session_id =我的prefs.getString（SESSION_ID，NULL）; 为InputStream的InputStream = NULL;
字符串结果= NULL;
尝试{ 字符串postReceiverUrl =HTTP：//notice.php // HttpClient的
HttpClient的HttpClient的=新DefaultHttpClient（）; //头后
HttpPost httpPost =新HttpPost（postReceiverUrl）; //添加数据
清单＆LT;＆的NameValuePair GT; namevaluepairs中=新的ArrayList＆LT;＆的NameValuePair GT;（2）;
nameValuePairs.add（新BasicNameValuePair（用户名，SESSION_ID））; httpPost.setEntity（新UrlEn codedFormEntity（namevaluepairs中））;
HTT presponse响应= httpClient.execute（httpPost）;
HttpEntity resEntity = response.getEntity（）; 的InputStream = resEntity.getContent（）;
// JSON默认为UTF-8
读者的BufferedReader =新的BufferedReader（新的InputStreamReader（InputStream中，UTF-8），8）;
StringBuilder的SB =新的StringBuilder（）; 串线= NULL;
而（（行= reader.readLine（））！= NULL）
{
sb.append（行+\\ n）;
}
结果= sb.toString（）;
}赶上（例外五）{
Log.i（tagconvertstr，[+导致+]）;
的System.out.println（E）;
}
最后{
尝试{如果（InputStream的！= NULL）inputStream.close（）;}赶上（例外挤）{}
}
返回结果;
} @覆盖
保护无效onPostExecute（字符串结果）{
myJSON =结果;
showList（）;
}
}
GetDataJSON G =新GetDataJSON（）;
g.execute（）;
}
//获取JSON数据停止}
解决方案
在您的ListView onItemClickListener
意向意图=新意图（currentyactivty.this，secondactiviy.class）;
intent.putExtra（TAG_NAME，personList.get（位置）获得（TAG_NAME））;
startActivity（意向）;
要在第二个活动在onCreate方法GETDATA
字符串数据;
在意向= getIntent（）;如果（在= NULL和放大器;！＆安培; in.hasExtra（TAG_NAME））{
数据= in.getStringArrayExtra（TAG_NAME）;
}
I am new in android.I am fetching data from mysql and showing it in listview.things are working fine but now i want to pass the value to intent when user click on listview(Row).I have implemented setOnItemClickListener.but the list view is dynamic so i am not getting how to get values and pass it to the intent.
Thanks in advance
public class AdminNotice extends Activity {
private String[] navMenuTitles;
private TypedArray navMenuIcons;
private EditText editTextName;
SharedPreferences sp;
private String jsonResult;
private ListView listView;
private Button b;
EditText etname, et;
TextView tv;
String myJSON;
private static final String TAG = "MainActivity.java";
private static final String TAG_NAME = "notice";
private static final String TAG_DATE = "ndate";
ProgressBar progressBar;
Date date;
JSONArray peoples = null;
ArrayList<HashMap<String, String>> personList;
ListView list;
public static final String USER_NAME = "USERNAME";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.noticelist);
progressBar = (ProgressBar) findViewById(R.id.progressbar);
//SharedPreferences myprefs= getSharedPreferences("user", MODE_WORLD_READABLE);
// String session_id= myprefs.getString("session_id", null);
//TextView textView = (TextView) findViewById(R.id.fname);
//textView.setText("Welcome "+session_id);
navMenuTitles = getResources().getStringArray(R.array.nav_drawer_items);
navMenuIcons = getResources().obtainTypedArray(R.array.nav_drawer_icons);
// load icons from
// strings.xml
list = (ListView) findViewById(R.id.listView);
personList = new ArrayList<HashMap<String,String>>();
getData();
}
//send messages stop
//get json data start
protected void showList(){
try {
JSONArray peoples = new JSONArray(myJSON);
for(int i=0;i<peoples.length();i++){
JSONObject c = peoples.getJSONObject(i);
String name=null, date=null;
/*if(c==null){
ProgressDialog progress = new ProgressDialog(this);
progress.setTitle("Loading");
progress.setMessage("Wait while loading...");
progress.show();
}*/
if(c.has("notice"))
if(c.has("ndate"))
progressBar.setVisibility(View.GONE);
name = c.getString("notice");
date = c.getString("ndate");
HashMap<String,String> persons = new HashMap<String,String>();
persons.put(TAG_NAME,name);
persons.put(TAG_DATE,date);
personList.add(persons);
}
ListAdapter adapter = new SimpleAdapter(
AdminNotice.this, personList, R.layout.list_item1,
new String[]{TAG_NAME,TAG_DATE},
new int[]{R.id.name, R.id.date}
);
list.setAdapter(adapter);
list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int position,
long id) {
/*ModelClass obj = getItem(position);
String name = obj.getName();*/
// Simple Toast to show the position Selected
Log.d("SELECT_POSITION", "Position For this List Item = " + position);
}
});
/* list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView parent, View view, int position, long id) {
Toast.makeText(getApplicationContext(), ((TextView) view).getText(), Toast.LENGTH_SHORT).show();
}
});*/
} catch (JSONException e) {
Log.i("tagconvertstr", "["+myJSON+"]");
}
}
public void getData(){
class GetDataJSON extends AsyncTask<String, Void, String>{
@Override
protected String doInBackground(String... params) {
SharedPreferences myprefs= getSharedPreferences("user", MODE_WORLD_READABLE);
String session_id= myprefs.getString("session_id", null);
InputStream inputStream = null;
String result = null;
try {
String postReceiverUrl = "http://notice.php";
// HttpClient
HttpClient httpClient = new DefaultHttpClient();
// post header
HttpPost httpPost = new HttpPost(postReceiverUrl);
// add your data
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
nameValuePairs.add(new BasicNameValuePair("username", session_id));
httpPost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = httpClient.execute(httpPost);
HttpEntity resEntity = response.getEntity();
inputStream = resEntity.getContent();
// json is UTF-8 by default
BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null)
{
sb.append(line + "\n");
}
result = sb.toString();
} catch (Exception e) {
Log.i("tagconvertstr", "["+result+"]");
System.out.println(e);
}
finally {
try{if(inputStream != null)inputStream.close();}catch(Exception squish){}
}
return result;
}
@Override
protected void onPostExecute(String result){
myJSON = result;
showList();
}
}
GetDataJSON g = new GetDataJSON();
g.execute();
}
//get json data stop
}
解决方案
Inside your listview onItemClickListener
Intent intent=new Intent(currentyactivty.this,secondactiviy.class);
intent.putExtra("TAG_NAME", personList.get(position).get(TAG_NAME));
startActivity(intent);
To getdata in second activity at onCreate method
String data;
Intent in=getIntent();
if(in!=null && in.hasExtra("TAG_NAME")){
data=in.getStringArrayExtra("TAG_NAME");
}
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