04-19 12:39:23.139 2933-2943/? E/art: Failed sending reply to debugger: Broken pipe
04-19 12:39:32.248 2933-2950/net.pushyfurball.currencyconversion E/Surface: getSlotFromBufferLocked: unknown buffer: 0xb4095db0
04-19 12:39:32.254 2933-2933/net.pushyfurball.currencyconversion E/AndroidRuntime: FATAL EXCEPTION: main
Process: net.pushyfurball.currencyconversion, PID: 2933
java.lang.NullPointerException: Attempt to invoke virtual method 'int org.json.JSONObject.length()' on a null object reference
at net.pushyfurball.currencyconversion.MainActivity$JSONParse.onPostExecute(MainActivity.java:89)
at net.pushyfurball.currencyconversion.MainActivity$JSONParse.onPostExecute(MainActivity.java:59)
at android.os.AsyncTask.finish(AsyncTask.java:651)
at android.os.AsyncTask.-wrap1(AsyncTask.java)
at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:668)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
That's the error I get when I am trying to use the code as follows:
package net.pushyfurball.currencyconversion;
import android.app.Activity;
import android.app.ProgressDialog;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.TextView;
import android.widget.Toast;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
import java.util.HashMap;
public class MainActivity extends Activity {
ListView list;
TextView code;
TextView name;
TextView rate;
Button Btngetdata;
ArrayList<HashMap<String, String>> exchangeRate = new ArrayList<HashMap<String, String>>();
//URL to get JSON Array
private static String url = "http://www.floatrates.com/daily/usd.json";
//JSON Node Names
private static final String TAG_CODE = "code";
private static final String TAG_NAME = "name";
private static final String TAG_RATE = "rate";
JSONObject currentRates = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
exchangeRate = new ArrayList<HashMap<String, String>>();
Btngetdata = (Button)findViewById(R.id.getdata);
Btngetdata.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
new JSONParse().execute();
}
});
}
private class JSONParse extends AsyncTask<String, String, JSONObject> {
private ProgressDialog pDialog;
@Override
protected void onPreExecute() {
super.onPreExecute();
code = (TextView)findViewById(R.id.code);
name = (TextView)findViewById(R.id.name);
rate = (TextView)findViewById(R.id.rate);
pDialog = new ProgressDialog(MainActivity.this);
pDialog.setMessage("Getting Data ...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
@Override
protected JSONObject doInBackground(String... args) {
JSONParser jParser = new JSONParser();
// Getting JSON from URL
JSONObject json = jParser.getJSONFromUrl(url);
return json;
}
@Override
protected void onPostExecute(JSONObject json) {
pDialog.dismiss();
try {
// Getting JSON Array from URL
for(int i = 0; i < currentRates.length(); i++){
JSONObject c = currentRates;
// Storing JSON item in a Variable
String code = c.getString(TAG_CODE);
String name = c.getString(TAG_NAME);
String rate = c.getString(TAG_RATE);
// Adding value HashMap key => value
HashMap<String, String> map = new HashMap<String, String>();
map.put(TAG_CODE, code);
map.put(TAG_NAME, name);
map.put(TAG_RATE, rate);
exchangeRate.add(map);
list=(ListView)findViewById(R.id.list);
ListAdapter adapter = new SimpleAdapter(MainActivity.this, exchangeRate,
R.layout.list_v,
new String[] { TAG_CODE,TAG_NAME, TAG_RATE }, new int[] {
R.id.code,R.id.name, R.id.rate});
list.setAdapter(adapter);
list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
Toast.makeText(MainActivity.this, "You Clicked at "+exchangeRate.get(+position).get("name"), Toast.LENGTH_SHORT).show();
}
});
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}
}
I have the issue when trying to pull the file from http://www.floatrates.com/daily/usd.json (which you can see in the code). The only errors I can semi figure out is the fact that is happens at the currentRate.length() but not sure as to why. When my friend sent me the code after I had given up, he said that I would need to change the JSONArray to JSONObject because of the json file I am trying to pull.
