I am currently trying to translate the code for the MainActivity of an app that I created in API10 into API 16. From what I have read, I have to start using ASyncTask to access a URI and display the information on my app. I managed to do that in 2.3, but after translating it to JSON, I am now facing some roadblocks.
Essentially, what the app does is that, it takes a manifest code i.e. WAMF33000 and at the click of a button, the Spinner is populated with the jobs contained in that manifest. As I am fairly new to the concept of ASyncTask, I would like to understand how my code applies to the theory behind ASyncTask.
Based on my code, I have some questions:- i) Which of my code in the ASyncTask is the parameter that is being passed? ii) What is the progress value in my AsyncTask? iii) Finally, is my return value the ArrayList of ManifestItems?
As of the 2.3 version, I invoke the JSON twice - once to load the consignments within the Manifest, and the second time to load details of a consignment selected in the spinner.
The following is my code:
package com.signonglass;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.*;
import android.os.AsyncTask;
import android.os.Build;
import android.os.Bundle;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.Intent;
import android.telephony.TelephonyManager;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends Activity
{
private final static String POD_URI = "http://192.168.0.105:8092/PodCore.svc";
private EditText evManifestCode;
private Spinner list_job;
private Button btnSubmit;
private String jobName;
private Button btnCons;
ArrayList<ManifestItemObj> jobList = new ArrayList<ManifestItemObj>();
ArrayList<ConsignmentItems> conItemList = new ArrayList<ConsignmentItems>();
Consignments retConsignment;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
evManifestCode = (EditText)findViewById(R.id.manifest);
btnSubmit = (Button)findViewById(R.id.btnSearchManifest);
list_job = (Spinner)findViewById(R.id.jobSpinner);
//tvView = (TextView)findViewById(R.id.deviceIdt);
//TelephonyManager telephonyManager = (TelephonyManager) this.getSystemService(Context.TELEPHONY_SERVICE);
//String IMEI_Number = telephonyManager.getDeviceId();
//tvView.setText("IMEI Number: " + IMEI_Number);
}
public class MyAsyncTask extends AsyncTask<String, Void, ArrayList<ManifestItemObj>>
{
protected void onPreExecute()
{
}
protected void onPostExecute(ArrayList<ManifestItemObj> jobList)
{
}
@Override
protected ArrayList<ManifestItemObj> doInBackground(String... params)
{
//http get request
HttpGet request = new HttpGet(POD_URI + "/getJobs/" + evManifestCode.getText().toString());
//set the hedear to get the data in JSON format
request.setHeader("Accept", "application/json");
request.setHeader("Content-type", "application/json");
DefaultHttpClient client = new DefaultHttpClient();
String theString = new String("");
try
{
//get the response
HttpResponse response = client.execute(request);
HttpEntity entity = response.getEntity();
InputStream is = entity.getContent();
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
StringBuilder builder = new StringBuilder();
String line;
while ((line = reader.readLine()) != null) {
builder.append(line);
}
is.close();
theString = builder.toString();
JSONObject jobsJSON = new JSONObject(theString);
JSONArray jobs = jobsJSON.getJSONArray("getJobsResult");
for(int i = 1; i < jobs.length(); i++)
{
JSONObject mit = jobs.getJSONObject(i);
ManifestItemObj mi = new ManifestItemObj();
mi.ManifestItemID = mit.getInt("ManifestItemID");
mi.JobType = mit.getString("JobType");
mi.FKID = mit.getInt("FKID");
jobList.add(mi);
}
}
catch (Exception e)
{
e.printStackTrace();
}
return jobList;
}
}
/*private void showToast(String msg)
{
// TODO Auto-generated method stub
Toast.makeText(this, "Toast: " + msg, Toast.LENGTH_LONG).show();
}*/
public void onViewConsignment(View view)
{
ShowItemsOfManifest(retConsignment);
}
public Consignments getConsignmentManifest(String consignment)
{
Consignments con = new Consignments();
try
{
DefaultHttpClient client = new DefaultHttpClient();
String theString = new String("");
//http get request
HttpGet request = new HttpGet(POD_URI + "/getJobDetails/" + consignment);
//set the hedear to get the data in JSON format
request.setHeader("Accept", "application/json");
request.setHeader("Content-type", "application/json");
//get the response
HttpResponse response = client.execute(request);
HttpEntity entity = response.getEntity();
InputStream is = entity.getContent();
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
StringBuilder builder = new StringBuilder();
String line;
while ((line = reader.readLine()) != null)
{
builder.append(line);
}
is.close();
theString = builder.toString();
JSONObject conJSON = new JSONObject(theString);
JSONArray cons = conJSON.getJSONArray("getJobDetailsResult");
for(int i = 0; i < cons.length(); i++)
{
JSONObject cObj = cons.getJSONObject(i);
con.ConsignmentID = cObj.getInt("ConsignmentID");
con.ConsignmentCreationDate = cObj.getString("ConsignmentCreationDate");
con.ConsignmentCustRef = cObj.getString("ConsignmentCustRef");
con.OrderNo = cObj.getString("OrderNo");
con.ConsignmentActive = cObj.getBoolean("ConsignmentActive");
con.JobType = cObj.getString("JobType");
//Client object
JSONObject clObj = cObj.getJSONObject("Client");
Clients cl = new Clients();
cl.ClientId = clObj.getInt("ClientID");
cl.ClientName = clObj.getString("ClientName");
con.Clients = cl;
//ShipTo object
JSONObject stObj = cObj.getJSONObject("ShipTo");
ShipTo sto = new ShipTo();
sto.ShipToId = stObj.getInt("ShipToId");
sto.ShipToName = stObj.getString("ShipToName");
sto.ShipToAddress1 = stObj.getString("ShipToAddress1");
sto.ShipToAddress2 = stObj.getString("ShipToAddress2");
sto.ShipToCity = stObj.getString("ShipToCity");
sto.ShipToPostcode = stObj.getString("ShipToPCode");
sto.ShipToState = stObj.getString("ShipToState");
con.ShipTo = sto;
//FreightZone object
JSONObject fzObj = cObj.getJSONObject("FreightZone");
FreightZones fz = new FreightZones();
fz.FreightZoneID = fzObj.getInt("FreightZoneId");
fz.FreightZone = fzObj.getString("FreightZone");
con.FreightZone = fz;
JSONArray conItems = cObj.getJSONArray("ConsignmentItems");
for(int m = 0; m < conItems.length(); m++)
{
JSONObject cit = conItems.getJSONObject(m);
ConsignmentItems ci = new ConsignmentItems();
ci.ConsignmentItemID = cit.getInt("ConsignmentItemsID");
ci.Quantity = cit.getInt("QTY");
//get Product from ConsignmentItems
JSONObject pro = cit.getJSONObject("Products");
Products prod = new Products();
prod.ProductId = pro.getInt("ProductID");
prod.ProductModel = pro.getString("ProductModel");
prod.ItemsPerCarton = pro.getInt("PerCarton");
prod.ProductDescription = pro.getString("Description");
prod.Height = (float) pro.getDouble("Height");
prod.Length = (float) pro.getDouble("Length");
prod.Width = (float) pro.getDouble("Width");
prod.Cubic = (float) pro.getDouble("Cubic");
ci.Product = prod;
conItemList.add(ci);
con.ConsignmentItems = conItemList;
}
}
}
catch(Exception e)
{
e.printStackTrace();
}
return con;
}
public void ShowItemsOfManifest(Consignments consignments)
{
Bundle bundle = new Bundle();
Intent newIntent = new Intent(this.getApplicationContext(), ConActivity.class);
newIntent.putExtras(bundle);
newIntent.putExtra("Consignment", consignments);
this.startActivity(newIntent);
}
public void onSearchClick(View view)
{
new MyAsyncTask().execute();
ManifestItemAdapter mia = new ManifestItemAdapter(MainActivity.this, android.R.layout.simple_spinner_item, jobList);
list_job.setAdapter(mia);
}
}
I look forward to understanding more about ASyncTask through your constructive comments on my code. Thanks ahead for helping me improve my code and my understanding of Android, guys! :)
PS: Please let me know if you need any more code to work with. I will update my post with more information as necessary. Cheers!
