我使用Android SDK 4.0 API14并且我希望在一个类中运行多个AsyncTask，我希望被调用的异步任务在它完成之前等待，但似乎我无法完成即便我测试当前正在执行的状态。这是我的代码：
if(isNetworkAvailable()){
new SpinnerTask().execute();
new RiderTask().execute();
new BankTask().execute();
}
//spinner bank
public class BankTask extends AsyncTask<Void, Void, String>{
String url="http://128.21.30.37:8080/E-Policy/ios/spaj_bank.htm?type=pusat";
public BankTask(){
this.url=url;
System.out.println(url);}
@Override
protected void onPreExecute() {
super.onPreExecute();
dialog=new ProgressDialog(Menu_SPPAJ.this);
dialog = ProgressDialog.show(Menu_SPPAJ.this, "Mohon Menunggu", "Penarikan data Rider..");}
@Override
protected String doInBackground(Void... params) {
// TODO Auto-generated method stub
String result = "";
try {
result = Connection.get(url);
System.out.println("tes " + result);
} catch (Exception e) {
// TODO: handle exception
result = "";
}
return result;
}
@Override
protected void onPostExecute(String result) {
dialog.dismiss();
// TODO Auto-generated method stub
super.onPostExecute(result);
// Response(result.replace("\n", "").trim());
System.out.println("done for Bank");
try {
JSONObject jsonObject = new JSONObject(result);
JSONArray PRODUK = jsonObject.getJSONArray("BANK PUSAT");
for (int i=0; i<PRODUK.length();i++){
JSONObject spinner = PRODUK.getJSONObject(i);
String LSBP_NAMA = spinner.optString("LSBP_NAMA");
int LSBP_ID = spinner.optInt("LSBP_ID");
helper.InsertBank(LSBP_ID, LSBP_NAMA);
// ListSpinner.add(VarSpinner);
System.out.println("tes VarSpinner");
}
}catch (Exception e) {
Log.d("TES", e.getMessage());
}
}
}
//spinner bank
public class CabBankTask extends AsyncTask<Void, Void, String>{
String url="http://128.21.30.37:8080/E-Policy/ios/spaj_bank.htm?type=cabang";
public CabBankTask(){
this.url=url;
System.out.println(url);}
@Override
protected void onPreExecute() {
super.onPreExecute();
dialog=new ProgressDialog(Menu_SPPAJ.this);
dialog = ProgressDialog.show(Menu_SPPAJ.this, "Mohon Menunggu", "Penarikan data Rider..");}
@Override
protected String doInBackground(Void... params) {
// TODO Auto-generated method stub
String result = "";
try {
result = Connection.get(url);
System.out.println("tes " + result);
} catch (Exception e) {
// TODO: handle exception
result = "";
}
return result;
}
@Override
protected void onPostExecute(String result) {
dialog.dismiss();
// TODO Auto-generated method stub
super.onPostExecute(result);
// Response(result.replace("\n", "").trim());
System.out.println("done for Cabang");
try {
JSONObject jsonObject = new JSONObject(result);
JSONArray PRODUK = jsonObject.getJSONArray("BANK CABANG");
for (int i=0; i<PRODUK.length();i++){
JSONObject spinner = PRODUK.getJSONObject(i);
int LSBP_ID = spinner.optInt("LSBP_ID");
int LBN_ID = spinner.optInt("LBN_ID");
String LBN_NAMA = spinner.optString("LBN_NAMA");
helper.InsertCabBank(LSBP_ID, LBN_ID, LBN_NAMA);
// ListSpinner.add(VarSpinner);
System.out.println("tes VarSpinner");
}
}catch (Exception e) {
Log.d("TES", e.getMessage());
}
}
}
//spinner produk
public class SpinnerTask extends AsyncTask<Void, Void, String>{
// String url="http://epolicy.sinarmasmsiglife.co.id/ios/spaj_prod.htm?model=1";
String url="http://128.21.30.37:8080/E-Policy/ios/spaj_prod.htm?type=bancass";
public SpinnerTask(){
this.url=url;
System.out.println(url);
}
@Override
protected void onPreExecute() {
super.onPreExecute();
dialog=new ProgressDialog(Menu_SPPAJ.this);
// dialog = ProgressDialog.show(Menu_SPPAJ.this, "Mohon Menunggu", "Penarikan data Produk..");
}
@Override
protected String doInBackground(Void... params) {
// TODO Auto-generated method stub
String result = "";
try {
result = Connection.get(url);
System.out.println("tes " + result);
} catch (Exception e) {
// TODO: handle exception
result = "";
}
return result;
}
@Override
protected void onPostExecute(String result) {
// TODO Auto-generated method stub
// dialog.dismiss();
super.onPostExecute(result);
fetchResponse(result.replace("\n", "").trim());
System.out.println("done for product");
}
}
private void fetchResponse(String result) {
if (!result.equals("")) {
try {
JSONObject jsonObject = new JSONObject(result);
JSONArray PRODUK = jsonObject.getJSONArray("PRODUK");
for (int i=0; i<PRODUK.length();i++){
JSONObject spinner = PRODUK.getJSONObject(i);
String LSBS_ID = spinner.optString("LSBS_ID");
String LSBS_NAME = spinner.optString("LSBS_NAME");
helper.InsertSpin_Produk(LSBS_ID, LSBS_NAME);
// ListSpinner.add(VarSpinner);
System.out.println("tes VarSpinner");
JSONArray PRODUK1 = spinner.getJSONArray("SUB_PRODUK");
for (int j=0; j<PRODUK1.length();j++){
JSONObject sub = PRODUK1.getJSONObject(j);
String LSDBS_NUMBER = sub.optString("LSDBS_NUMBER");
String LSDBS_NAME = sub.optString("LSDBS_NAME");
helper.InsertSpin_SubProduk(LSBS_ID,LSBS_NAME,LSDBS_NUMBER, LSDBS_NAME);
System.out.println("tes VarSpinner 1\2");
}
}
}
catch (Exception e) {
Log.d("TES", e.getMessage());
}
}
}
//Rider
public class RiderTask extends AsyncTask<Void, Void, String>{
String url="http://128.21.30.37:8080/E-Policy/ios/spaj_prod.htm?type=rider";
public RiderTask(){
this.url=url;
System.out.println(url);
}
@Override
protected void onPreExecute() {
super.onPreExecute();
dialog=new ProgressDialog(Menu_SPPAJ.this);
dialog = ProgressDialog.show(Menu_SPPAJ.this, "Mohon Menunggu", "Penarikan data Rider..");
}
@Override
protected String doInBackground(Void... params) {
// TODO Auto-generated method stub
String result = "";
try {
result = Connection.get(url);
System.out.println("tes " + result);
} catch (Exception e) {
// TODO: handle exception
result = "";
}
return result;
}
@Override
protected void onPostExecute(String result) {
dialog.dismiss();
// TODO Auto-generated method stub
super.onPostExecute(result);
Response(result.replace("\n", "").trim());
System.out.println("done for ridern");
}
}
有没有办法在一个类中运行多个Asynctask？非常感谢你
答案 0 :(得分：2)
查看AsyncTask.executeOnExecutor()方法。它将并行运行AsyncTasks。但请确保您运行的任务彼此独立。正如文档中所提到的，没有给出任务执行的给定顺序。
按照以下方式调用您的任务：
new SpinnerTask().executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
答案 1 :(得分：-1)
您可以做的是，您可以在第一个AsyncTask的{{1}}上拨打第二个onPostExecute()，依此类推。
e.g
AsyncTask