请帮忙...... 我是asyntask的新手 所以我真的不明白哪些参数传递给哪一个
private class LoadViewTask extends AsyncTask<Void, HashMap<String, String>, Void> {
private SearchListAdapter adapter;
// Before running code in separate thread
@Override
protected void onPreExecute() {
}
// The code to be executed in a background thread.
@Override
protected Void doInBackground(Void... params) {
String filterRev = "";
try {
filterRev = URLEncoder.encode(
MainActivity.FILTER_SEARCH_ENTERPRISE, "utf-8");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
final String dummyURL5star = MainActivity.BASE_URL
+ "v_enterprise-select5star.php?filteritem=" + filterRev;
final String dummyURL4star = MainActivity.BASE_URL
+ "v_enterprise-select4star.php?filteritem=" + filterRev;
final String dummyURL3star = MainActivity.BASE_URL
+ "v_enterprise-select3star.php?filteritem=" + filterRev;
final String dummyURL2star = MainActivity.BASE_URL
+ "v_enterprise-select2star.php?filteritem=" + filterRev;
final String dummyURL1star = MainActivity.BASE_URL
+ "v_enterprise-select1star.php?filteritem=" + filterRev;
xResult5star = MainActivity.getRequestSelect(dummyURL5star,
SearchActivity.this);
try {
jObject5 = new JSONObject(xResult5star);
JSONArray menuitemArray = jObject5.getJSONArray("venterprise");
if (panjangList < menuitemArray.length()) {
for (int i = 0; i < panjangList; i++) {
HashMap<String, String> map = new HashMap<String, String>();
map.put(KEY_IDENTERPRISE, menuitemArray.getJSONObject(i)
.getString("identerprise").toString());
map.put(KEY_NAMAENTERPRISE, menuitemArray.getJSONObject(i)
.getString("nama").toString());
map.put(KEY_ALAMATENTERPRISE, menuitemArray.getJSONObject(i)
.getString("address").toString());
map.put(KEY_KATEGORI,
menuitemArray.getJSONObject(i).getString("linkkat")
.toString());
map.put(KEY_LINK,
menuitemArray.getJSONObject(i).getString("linksub")
.toString());
map.put(KEY_KAT,
menuitemArray.getJSONObject(i).getString("kategori")
.toString());
map.put(KEY_SUB,
menuitemArray.getJSONObject(i).getString("subkategori")
.toString());
map.put(KEY_IDKAT,
menuitemArray.getJSONObject(i).getString("idkategori")
.toString());
map.put(KEY_IDSUB,
menuitemArray.getJSONObject(i)
.getString("idsubkategori").toString());
map.put(KEY_THUMB_URL, menuitemArray.getJSONObject(i)
.getString("picture").toString());
map.put(KEY_HITS,
menuitemArray.getJSONObject(i).getString("hit")
.toString());
map.put(KEY_NOKONTRAKS, menuitemArray.getJSONObject(i)
.getString("nokontrak").toString());
map.put(KEY_STAR, "5");
listRow.add(map);
}
}
/*
* list = (ListView) findViewById(R.id.lvRowsEnterpriseSearch);
* adapter = new SearchListAdapter(this, listRow);
* list.setAdapter(adapter); registerForContextMenu(list);
*/
else {
sisaList = panjangList - menuitemArray.length();
for (int i = 0; i < menuitemArray.length(); i++) {
HashMap<String, String> map = new HashMap<String, String>();
map.put(KEY_IDENTERPRISE, menuitemArray.getJSONObject(i)
.getString("identerprise").toString());
map.put(KEY_NAMAENTERPRISE, menuitemArray.getJSONObject(i)
.getString("nama").toString());
map.put(KEY_ALAMATENTERPRISE, menuitemArray.getJSONObject(i)
.getString("address").toString());
map.put(KEY_KATEGORI,
menuitemArray.getJSONObject(i).getString("linkkat")
.toString());
map.put(KEY_LINK,
menuitemArray.getJSONObject(i).getString("linksub")
.toString());
map.put(KEY_KAT,
menuitemArray.getJSONObject(i).getString("kategori")
.toString());
map.put(KEY_SUB,
menuitemArray.getJSONObject(i).getString("subkategori")
.toString());
map.put(KEY_IDKAT,
menuitemArray.getJSONObject(i).getString("idkategori")
.toString());
map.put(KEY_IDSUB,
menuitemArray.getJSONObject(i)
.getString("idsubkategori").toString());
map.put(KEY_THUMB_URL, menuitemArray.getJSONObject(i)
.getString("picture").toString());
map.put(KEY_HITS,
menuitemArray.getJSONObject(i).getString("hit")
.toString());
map.put(KEY_NOKONTRAKS, menuitemArray.getJSONObject(i)
.getString("nokontrak").toString());
map.put(KEY_STAR, "5");
listRow.add(map);
}
/*
* list = (ListView) findViewById(R.id.lvRowsEnterpriseSearch);
* adapter = new SearchListAdapter(this, listRow);
* list.setAdapter(adapter); registerForContextMenu(list);
*/
xResult4star = MainActivity.getRequestSelect(dummyURL4star,
SearchActivity.this);
jObject4 = new JSONObject(xResult4star);
JSONArray menuitemArray4 = jObject4.getJSONArray("venterprise");
JSONArray menuitemArraySession = jObject4.getJSONArray("session");
if (sisaList < menuitemArray4.length()) {
for (int i = 0; i < sisaList; i++) {
HashMap<String, String> map = new HashMap<String, String>();
map.put(KEY_IDENTERPRISE, menuitemArray4.getJSONObject(i)
.getString("identerprise").toString());
map.put(KEY_NAMAENTERPRISE, menuitemArray4.getJSONObject(i)
.getString("nama").toString());
map.put(KEY_ALAMATENTERPRISE,
menuitemArray4.getJSONObject(i)
.getString("address").toString());
map.put(KEY_KATEGORI, menuitemArray4.getJSONObject(i)
.getString("linkkat").toString());
map.put(KEY_LINK, menuitemArray4.getJSONObject(i)
.getString("linksub").toString());
map.put(KEY_KAT,
menuitemArray4.getJSONObject(i)
.getString("kategori").toString());
map.put(KEY_SUB,
menuitemArray4.getJSONObject(i)
.getString("subkategori").toString());
map.put(KEY_IDKAT, menuitemArray4.getJSONObject(i)
.getString("idkategori").toString());
map.put(KEY_IDSUB, menuitemArray4.getJSONObject(i)
.getString("idsubkategori").toString());
map.put(KEY_THUMB_URL, menuitemArray4.getJSONObject(i)
.getString("picture").toString());
map.put(KEY_HITS, menuitemArray4.getJSONObject(i)
.getString("hit").toString());
map.put(KEY_NOKONTRAKS, menuitemArray4.getJSONObject(i)
.getString("nokontrak").toString());
map.put(KEY_STAR, "4");
listRow.add(map);
}
/*
* list = (ListView) findViewById(R.id.lvRowsEnterpriseSearch);
* adapter = new SearchListAdapter(this, listRow);
* list.setAdapter(adapter); registerForContextMenu(list);
*/
} else {
for (int i = 0; i < menuitemArray4.length(); i++) {
HashMap<String, String> map = new HashMap<String, String>();
map.put(KEY_IDENTERPRISE, menuitemArray4.getJSONObject(i)
.getString("identerprise").toString());
map.put(KEY_NAMAENTERPRISE, menuitemArray4.getJSONObject(i)
.getString("nama").toString());
map.put(KEY_ALAMATENTERPRISE,
menuitemArray4.getJSONObject(i)
.getString("address").toString());
map.put(KEY_KATEGORI, menuitemArray4.getJSONObject(i)
.getString("linkkat").toString());
map.put(KEY_LINK, menuitemArray4.getJSONObject(i)
.getString("linksub").toString());
map.put(KEY_KAT,
menuitemArray4.getJSONObject(i)
.getString("kategori").toString());
map.put(KEY_SUB,
menuitemArray4.getJSONObject(i)
.getString("subkategori").toString());
map.put(KEY_IDKAT, menuitemArray4.getJSONObject(i)
.getString("idkategori").toString());
map.put(KEY_IDSUB, menuitemArray4.getJSONObject(i)
.getString("idsubkategori").toString());
map.put(KEY_THUMB_URL, menuitemArray4.getJSONObject(i)
.getString("picture").toString());
map.put(KEY_HITS, menuitemArray4.getJSONObject(i)
.getString("hit").toString());
map.put(KEY_NOKONTRAKS, menuitemArray4.getJSONObject(i)
.getString("nokontrak").toString());
map.put(KEY_STAR, "4");
listRow.add(map);
}
/*
* list = (ListView) findViewById(R.id.lvRowsEnterpriseSearch);
* adapter = new SearchListAdapter(this, listRow);
* list.setAdapter(adapter); registerForContextMenu(list);
*/
sisaList = sisaList - menuitemArray4.length();
xResult3star = MainActivity.getRequestSelect(dummyURL3star,
SearchActivity.this);
jObject3 = new JSONObject(xResult3star);
JSONArray menuitemArray3 = jObject3.getJSONArray("venterprise");
if (sisaList < menuitemArray3.length()) {
for (int i = 0; i < sisaList; i++) {
HashMap<String, String> map = new HashMap<String, String>();
map.put(KEY_IDENTERPRISE,
menuitemArray3.getJSONObject(i)
.getString("identerprise").toString());
map.put(KEY_NAMAENTERPRISE, menuitemArray3
.getJSONObject(i).getString("nama").toString());
map.put(KEY_ALAMATENTERPRISE, menuitemArray3
.getJSONObject(i).getString("address")
.toString());
map.put(KEY_KATEGORI, menuitemArray3.getJSONObject(i)
.getString("linkkat").toString());
map.put(KEY_LINK, menuitemArray3.getJSONObject(i)
.getString("linksub").toString());
map.put(KEY_KAT, menuitemArray3.getJSONObject(i)
.getString("kategori").toString());
map.put(KEY_SUB, menuitemArray3.getJSONObject(i)
.getString("subkategori").toString());
map.put(KEY_IDKAT, menuitemArray3.getJSONObject(i)
.getString("idkategori").toString());
map.put(KEY_IDSUB, menuitemArray3.getJSONObject(i)
.getString("idsubkategori").toString());
map.put(KEY_THUMB_URL, menuitemArray3.getJSONObject(i)
.getString("picture").toString());
map.put(KEY_HITS, menuitemArray3.getJSONObject(i)
.getString("hit").toString());
map.put(KEY_NOKONTRAKS, menuitemArray3.getJSONObject(i)
.getString("nokontrak").toString());
map.put(KEY_STAR, "3");
listRow.add(map);
}
/*
* list = (ListView)
* findViewById(R.id.lvRowsEnterpriseSearch); adapter = new
* SearchListAdapter(this, listRow);
* list.setAdapter(adapter); registerForContextMenu(list);
*/
} else {
for (int i = 0; i < menuitemArray3.length(); i++) {
HashMap<String, String> map = new HashMap<String, String>();
map.put(KEY_IDENTERPRISE,
menuitemArray3.getJSONObject(i)
.getString("identerprise").toString());
map.put(KEY_NAMAENTERPRISE, menuitemArray3
.getJSONObject(i).getString("nama").toString());
map.put(KEY_ALAMATENTERPRISE, menuitemArray3
.getJSONObject(i).getString("address")
.toString());
map.put(KEY_KATEGORI, menuitemArray3.getJSONObject(i)
.getString("linkkat").toString());
map.put(KEY_LINK, menuitemArray3.getJSONObject(i)
.getString("linksub").toString());
map.put(KEY_KAT, menuitemArray3.getJSONObject(i)
.getString("kategori").toString());
map.put(KEY_SUB, menuitemArray3.getJSONObject(i)
.getString("subkategori").toString());
map.put(KEY_IDKAT, menuitemArray3.getJSONObject(i)
.getString("idkategori").toString());
map.put(KEY_IDSUB, menuitemArray3.getJSONObject(i)
.getString("idsubkategori").toString());
map.put(KEY_THUMB_URL, menuitemArray3.getJSONObject(i)
.getString("picture").toString());
map.put(KEY_HITS, menuitemArray3.getJSONObject(i)
.getString("hit").toString());
map.put(KEY_NOKONTRAKS, menuitemArray3.getJSONObject(i)
.getString("nokontrak").toString());
map.put(KEY_STAR, "3");
listRow.add(map);
}
/*
* list = (ListView)
* findViewById(R.id.lvRowsEnterpriseSearch); adapter = new
* SearchListAdapter(this, listRow);
* list.setAdapter(adapter); registerForContextMenu(list);
*/
sisaList = sisaList - menuitemArray3.length();
xResult2star = MainActivity.getRequestSelect(dummyURL2star,
SearchActivity.this);
jObject2 = new JSONObject(xResult2star);
JSONArray menuitemArray2 = jObject2
.getJSONArray("venterprise");
if (sisaList < menuitemArray2.length()) {
for (int i = 0; i < sisaList; i++) {
HashMap<String, String> map = new HashMap<String, String>();
map.put(KEY_IDENTERPRISE, menuitemArray2
.getJSONObject(i).getString("identerprise")
.toString());
map.put(KEY_NAMAENTERPRISE, menuitemArray2
.getJSONObject(i).getString("nama")
.toString());
map.put(KEY_ALAMATENTERPRISE, menuitemArray2
.getJSONObject(i).getString("address")
.toString());
map.put(KEY_KATEGORI,
menuitemArray2.getJSONObject(i)
.getString("linkkat").toString());
map.put(KEY_LINK, menuitemArray2.getJSONObject(i)
.getString("linksub").toString());
map.put(KEY_KAT, menuitemArray2.getJSONObject(i)
.getString("kategori").toString());
map.put(KEY_SUB, menuitemArray2.getJSONObject(i)
.getString("subkategori").toString());
map.put(KEY_IDKAT, menuitemArray2.getJSONObject(i)
.getString("idkategori").toString());
map.put(KEY_IDSUB, menuitemArray2.getJSONObject(i)
.getString("idsubkategori").toString());
map.put(KEY_THUMB_URL, menuitemArray2
.getJSONObject(i).getString("picture")
.toString());
map.put(KEY_HITS, menuitemArray2.getJSONObject(i)
.getString("hit").toString());
map.put(KEY_NOKONTRAKS, menuitemArray2
.getJSONObject(i).getString("nokontrak")
.toString());
map.put(KEY_STAR, "2");
listRow.add(map);
}
/*
* list = (ListView)
* findViewById(R.id.lvRowsEnterpriseSearch); adapter =
* new SearchListAdapter(this, listRow);
* list.setAdapter(adapter);
* registerForContextMenu(list);
*/
} else {
for (int i = 0; i < menuitemArray2.length(); i++) {
HashMap<String, String> map = new HashMap<String, String>();
map.put(KEY_IDENTERPRISE, menuitemArray2
.getJSONObject(i).getString("identerprise")
.toString());
map.put(KEY_NAMAENTERPRISE, menuitemArray2
.getJSONObject(i).getString("nama")
.toString());
map.put(KEY_ALAMATENTERPRISE, menuitemArray2
.getJSONObject(i).getString("address")
.toString());
map.put(KEY_KATEGORI,
menuitemArray2.getJSONObject(i)
.getString("linkkat").toString());
map.put(KEY_LINK, menuitemArray2.getJSONObject(i)
.getString("linksub").toString());
map.put(KEY_KAT, menuitemArray2.getJSONObject(i)
.getString("kategori").toString());
map.put(KEY_SUB, menuitemArray2.getJSONObject(i)
.getString("subkategori").toString());
map.put(KEY_IDKAT, menuitemArray2.getJSONObject(i)
.getString("idkategori").toString());
map.put(KEY_IDSUB, menuitemArray2.getJSONObject(i)
.getString("idsubkategori").toString());
map.put(KEY_THUMB_URL, menuitemArray2
.getJSONObject(i).getString("picture")
.toString());
map.put(KEY_HITS, menuitemArray2.getJSONObject(i)
.getString("hit").toString());
map.put(KEY_NOKONTRAKS, menuitemArray2
.getJSONObject(i).getString("nokontrak")
.toString());
map.put(KEY_STAR, "2");
listRow.add(map);
}
/*
* list = (ListView)
* findViewById(R.id.lvRowsEnterpriseSearch); adapter =
* new SearchListAdapter(this, listRow);
* list.setAdapter(adapter);
* registerForContextMenu(list);
*/
sisaList = sisaList - menuitemArray2.length();
xResult1star = MainActivity.getRequestSelect(
dummyURL1star, SearchActivity.this);
jObject1 = new JSONObject(xResult1star);
JSONArray menuitemArray1 = jObject1
.getJSONArray("venterprise");
if (sisaList < menuitemArray1.length()) {
for (int i = 0; i < sisaList; i++) {
HashMap<String, String> map = new HashMap<String, String>();
map.put(KEY_IDENTERPRISE,
menuitemArray1.getJSONObject(i)
.getString("identerprise")
.toString());
map.put(KEY_NAMAENTERPRISE, menuitemArray1
.getJSONObject(i).getString("nama")
.toString());
map.put(KEY_ALAMATENTERPRISE, menuitemArray1
.getJSONObject(i).getString("address")
.toString());
map.put(KEY_KATEGORI, menuitemArray1
.getJSONObject(i).getString("linkkat")
.toString());
map.put(KEY_LINK,
menuitemArray1.getJSONObject(i)
.getString("linksub")
.toString());
map.put(KEY_KAT, menuitemArray1
.getJSONObject(i).getString("kategori")
.toString());
map.put(KEY_SUB,
menuitemArray1.getJSONObject(i)
.getString("subkategori")
.toString());
map.put(KEY_IDKAT,
menuitemArray1.getJSONObject(i)
.getString("idkategori")
.toString());
map.put(KEY_IDSUB,
menuitemArray1.getJSONObject(i)
.getString("idsubkategori")
.toString());
map.put(KEY_THUMB_URL, menuitemArray1
.getJSONObject(i).getString("picture")
.toString());
map.put(KEY_HITS,
menuitemArray1.getJSONObject(i)
.getString("hit").toString());
map.put(KEY_NOKONTRAKS, menuitemArray1
.getJSONObject(i)
.getString("nokontrak").toString());
map.put(KEY_STAR, "1");
listRow.add(map);
}
/*
* list = (ListView)
* findViewById(R.id.lvRowsEnterpriseSearch);
* adapter = new SearchListAdapter(this, listRow);
* list.setAdapter(adapter);
* registerForContextMenu(list);
*/
}
}
}
}
}
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
for ( HashMap<String, String> item: listRow)
{
publishProgress(item);
}
return null;
}
// Update the progress
@Override
protected void onProgressUpdate(HashMap<String, String>... values) {
}
// after executing the code in the thread
@Override
protected void onPostExecute(Void result) {list = (ListView) findViewById(R.id.lvRowsEnterpriseSearch);
adapter = new SearchListAdapter(SearchActivity.this, listRow);
list.setAdapter(adapter);
registerForContextMenu(list);
}
}
在这种情况下，我必须将5个查询中的数据填充到1个listview中 当我运行应用程序时，布局会在1秒内出现，然后强制关闭。 当我对它进行debbug时，执行任务时会出现问题。
答案 0 :(得分：1)
您的问题在于下面的代码（当您创建Aysnc任务时，doInBackground方法在UI线程的单独线程中运行。因此您无法从此方法更新UI。）：
list = (ListView) findViewById(R.id.lvRowsEnterpriseSearch);
adapter = new SearchListAdapter(SearchActivity.this, listRow);
list.setAdapter(adapter);
registerForContextMenu(list);
将上述代码移至onPostExecute方法。
答案 1 :(得分：0)
首先你创建asynctask就像（Void，HashMap（String，String），Void）意味着，
第一个参数：当你调用asynctask时传递给，听到是Void所以没有像new LoadViewTask().execute();那样传递
第二个参数：此参数从doInBackground方法返回，这是HashMap（String，String），因此您可以返回此参数。
所以你从listRow返回了doInBackground。
然后将代码doInBackground移至onPostExecute()。
list = (ListView) findViewById(R.id.lvRowsEnterpriseSearch);
adapter = new SearchListAdapter(SearchActivity.this, listRow);
list.setAdapter(adapter);
registerForContextMenu(list);
同样doInBackground方法在与UI线程分开的线程中运行。因此，您无法从此方法更新UI。